X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=inn-innduct.git;a=blobdiff_plain;f=backends%2Finnduct.c;h=8b4b2859359150848e8cccd79a842ed1ddb38ba2;hp=43d4dd2cdcf05df3c22709037ef5ab8e93b2547c;hb=bd976de6f0a8f28a87c4261be5b3df3f59bdb661;hpb=ccfd1e3f48e3b15590263606cf0c6b5317762180 diff --git a/backends/innduct.c b/backends/innduct.c index 43d4dd2..8b4b285 100644 --- a/backends/innduct.c +++ b/backends/innduct.c @@ -1,58 +1,186 @@ /* + * Newsfeeds file entries should look like this: + * host.name.of.site[/exclude,exclude,...]\ + * :pattern,pattern...[/distribution,distribution...]\ + * :Tf,Wnm + * : + * or + * sitename[/exclude,exclude,...]\ + * :pattern,pattern...[/distribution,distribution...]\ + * :Tf,Wnm + * :host.name.of.site + * * Four files full of - * token article + * token messageid + * or might be blanked out + * .... + * + * F site.name main feed file + * opened/created, then written, by innd + * read by duct + * unlinked by duct + * tokens blanked out by duct when processed + * site.name_lock lock preventing multiple ducts + * to hold lock must open,F_SETLK[W] + * and then stat to check that locked file + * still has name site.name_lock + * holder of this lock is "duct" + * (only) lockholder may remove the lockfile + * D site.name_flushing temporary feed file during flush (or crash) + * hardlink created by duct + * unlinked by duct + * site.name_defer 431'd articles, still being written, + * created, written, used by duct * - * site.name_ductlock lock taken out by innduct - * F site.name written by innd - * D site.name_duct moved aside by innduct, for flush - * site.name_deferwork 431'd articles, still being written - * site.name_defergo_ 431'd articles, ready for innxmit - * site.name_deferlock lock taken out by innxmit wrapper + * site.name_backlog.. + * 431'd articles, ready for innxmit or duct + * created (link/mv) by duct + * site.name_backlog (where does not + * contain '#' or '~') eg + * site.name_backlog.manual + * anything the sysadmin likes (eg, feed files + * from old feeds to be merged into this one) + * created (link/mv) by admin + * may be symlinks (in which case links + * may be written through, but only links + * will be removed. * + * It is safe to remove backlog files manually, + * if it's desired to throw away the backlog. * + * Backlog files are also processed by innduct. We find the oldest + * backlog file which is at least a certain amount old, and feed it + * back into our processing. When every article in it has been read + * and processed, we unlink it and look for another backlog file. * - * OVERALL STATES: + * If we don't have a backlog file that we're reading, we close the + * defer file that we're writing and make it into a backlog file at + * the first convenient opportunity. + + + OVERALL STATES: + + START + | + check D, F + | + <--------------------------------------'| + Nothing F, D both ENOENT | + F: ENOENT | + D: ENOENT | + duct: not not reading anything | + | | + |`---------------------. | + | | duct times out waiting for F | + V innd creates F | duct exits | + | V | + Noduct GO TO Dropped | + F: innd writing | + D: ENOENT | + duct: not running or not reading anything | + | | + | | + ,-->--+ <---------------------------------'| + | | duct opens F F exists | + | | D ENOENT | + | V | + | Normal | + | F: innd writing, duct reading | + | D: ENOENT | + | | | + | | duct decides time to flush | + | | duct makes hardlink | + | | | + | V <------------------------'| + | Hardlinked F==D | + | F == D: innd writing, duct reading both exist | + ^ | | + | | duct unlinks F | + | V | + | Moved <----+------------<--'| + | F: ENOENT | F ENOENT | + | D: innd writing, duct reading | D exists | + | | | | + | | duct requests flush of feed | | + | | (others can too, harmlessly) | | + | V | | + | Flushing | | + | F: ENOENT | | + | D: innd flushing, duct reading | | + | | | | + | | inndcomm flush fails | | + | |`-------------------------->---------' | + | | | + | | inndcomm reports no such site | + | |`---------------------------------------------------- | -. + | | | | + | | innd finishes writing D, creates F | | + | | inndcomm reports flush successful | | + | | | | + | V | | + | Separated <----------------' | + | F: innd writing F!=D / + | D: duct reading both exist / + | | / + | | duct gets to the end of D / + | | duct opens F too / + | V / + | Finishing / + | F: innd writing, duct reading | + | D: duct finishing V + | | Dropping + | | duct finishes processing D F: ENOENT + | V duct unlinks D D: duct reading + | | | + `--<--' | duct finishes + | processing D + | duct unlinks D + | duct exits + V + Dropped + F: ENOENT + D: ENOENT + duct not running + + "duct reading" means innduct is reading the file but also + overwriting processed tokens. + * - * START - * ,-->--. | - * | | stat D - * | | / | - * | | ENOENT/ |exists - * | V <----------' | - * | Normal stat F - * | F: innd writing, duct reading /|\ - * | D: ENOENT / | \ - * | | / | \ - * | | duct decides time to flush same / | | - * | | duct makes hardlink as D / | | - * | | / | | - * | V <---------' | | - * | Hardlinked | | - * | F == D: innd writing, duct reading | | - * ^ | | | - * | | duct unlinks F / | - * | V ENOENT / | - * | Moved <------------' | - * | F: ENOENT | - * | D: innd writing, duct reading | - * | | | - * | | duct flushes feed | - * | | (others can too, harmlessly) | - * | V | - * | Separated <-----------------' - * | F: innd writing different to D - * | D: duct reading - * | | - * | V duct completes processing of D - * | | duct unlinks D - * | | - * `--<--' * */ -static int max_connections, max_queue_per_conn; -static int connection_setup_timeout, port, try_stream; + +/*----- general definitions, probably best not changed -----*/ + +#define PERIOD_SECONDS 60 + +#define CONNCHILD_ESTATUS_STREAM 4 +#define CONNCHILD_ESTATUS_NOSTREAM 5 + +#define INNDCOMMCHILD_ESTATUS_FAIL 6 +#define INNDCOMMCHILD_ESTATUS_NONESUCH 7 + + +/*----- configuration options -----*/ + +static char *sitename, *feedfile; +static int max_connections=10, max_queue_per_conn=200; +static int connection_setup_timeout=200, port=119, try_stream=1; +static int inndcomm_flush_timeout=100, quiet_if_locked=0; static const char *remote_host; +static int reconnect_delay_periods, flushfail_retry_periods, open_wait_periods; +static int backlog_retry_minperiods, backlog_spontaneous_rescan_periods; +static const char *inndconffile; + +static double accept_proportion; +static double nocheck_thresh_pct= 95.0; +static double nocheck_thresh; /* computed in main from _pct */ +static double nocheck_decay_articles= 100; /* converted to _decay */ +static double nocheck_decay; /* computed in main from _articles */ +static int nocheck, nocheck_reported; + + +/*----- doubly linked lists -----*/ #define ISNODE(T) T *next, *back; #define LIST(T) struct { T *head, *tail, *tailpred; int count; } @@ -73,56 +201,153 @@ static const char *remote_host; #define LIST_INSERT(l,n,pred) \ (list_insert((struct list*)&(l), NODE((n)), NODE((pred))), (void)(l).count++) -struct Article { - char *mid; - int midlen; - int checked; -}; -#define CONNBUFSZ 16384 +/*----- statistics -----*/ -#define CN "<%d> " +#define RESULT_COUNTS \ + RC(offered) \ + RC(sent) \ + RC(unwanted) \ + RC(accepted) \ + RC(rejected) \ + RC(deferred) + +typedef enum { +#define RC_INDEX(x) RCI_##x + RESULT_COUNTS + RCI_max +} ResultCountIndex; + +typedef struct { + int articles[2 /* checked */][RCI_max]; +} Counts; -typedef struct Conn Conn; + +/*----- transmission buffers -----*/ + +#define CONNIOVS 128 typedef enum { - Malloc, Const, Artdata; + xk_Malloc, xk_Const, xk_Artdata; } XmitKind; + typedef struct { XmitKind kind; union { char *malloc_tofree; - } + ARTHANDLE *sm_art; + } info; } XmitDetails; + +/*----- core operational data structure types -----*/ + +struct Article { + int midlen; + int checked, sentbody; + InputFile *ipf; + TOKEN token; + off_t offset; + int blanklen; + char messageid[1]; +}; + +typedef struct InputFile { + /* This is an instance of struct oop_readable */ + struct oop_readable readable; /* first */ + oop_readable_call *readable_callback; + void *readable_callback_user; + + int fd; + struct Filemon_Perfile *filemon; + + oop_read *rd; + long inprogress; /* no. of articles read but not processed */ + off_t offset; + + Counts counts; + char path[]; +} InputFile; + +#define SMS_LIST(X) \ + X(WAITING) \ + X(NORMAL) \ + X(FLUSHING) \ + X(FLUSHFAIL) \ + X(SEPARATED) \ + X(DROPPING) + +typedef enum { +#define SMS_DEF_ENUM(s) sm_##s, + SMS_LIST(SMS_DEF_ENUM) +} StateMachineState; + +static const char *sms_names[]= { +#define SMS_DEF_NAME(s) #s , + SMS_LIST(SMS_DEF_NAME) + 0 +}; + struct Conn { ISNODE(Conn); int fd, max_queue, stream; - LIST(Article) sent; /* in xmit or transmitted */ - Article send; /* partially transmitted */ - LIST(Article) queue; /* not yet in xmit */ - struct iovec *xmit; - XmitDetails *xmitd; + LIST(Article) queue; /* not yet told peer, or CHECK said send it */ + LIST(Article) sent; /* offered/transmitted - in xmit or waiting reply */ + struct iovec xmit[CONNIOVS]; + XmitDetails xmitd[CONNIOVS]; int xmitu; }; -#define CHILD_ESTATUS_STREAM 4 -#define CHILD_ESTATUS_NOSTREAM 5 +/*----- operational variables -----*/ -static int since_connect_attempt; static int nconns; static LIST(Conn) idle, working, full; - static LIST(Article) *queue; +static char *path_lock, *path_flushing, *path_defer; + +#define SMS(newstate, periods, why) \ + (statemc_setstate(sm_##newstate,(periods),#newstate,(why))) + +static StateMachineState sms; +static FILE *defer; +static InputFile *main_input_file, *flushing_input_file, *backlog_input_file; +static int sm_period_counter; + + +/*----- function predeclarations -----*/ + +static void conn_check_work(Conn *conn); + +static int filemon_init(void); +static void filemon_setfile(int mainfeed_fd, const char *mainfeed_path); +static void filemon_callback(void); + +static void statemc_setstate(StateMachineState newsms, int periods, + const char *forlog, const char *why); + +/*========== utility functions etc. ==========*/ + static void perhaps_close(int *fd) { if (*fd) { close(*fd); fd=0; } } +static pid_t xfork(const char *what) { + pid_t child; -/*========== making new connections ==========*/ + child= fork(); + if (child==-1) sysdie("cannot fork for %s",what); + if (!child) postfork(what); + return child; +} -static int connecting_sockets[2]= {-1,-1}; -static pid_t connecting_child; +static void on_fd_read_except(int fd, oop_call_fd callback) { + loop->on_fd(loop, fd, OOP_READ, callback, 0); + loop->on_fd(loop, fd, OOP_EXCEPTION, callback, 0); +} +static void cancel_fd_read_except(int fd) { + loop->cancel_fd(loop, fd, OOP_READ); + loop->cancel_fd(loop, fd, OOP_EXCEPTION); +} static void report_child_status(const char *what, int status) { if (WIFEXITED(status)) { @@ -143,27 +368,130 @@ static void report_child_status(const char *what, int status) { } } -static void connect_attempt_discard(void) { - if (connecting_sockets[0]) { - cancel_fd(loop, connecting_sockets[0], OOP_READ); - cancel_fd(loop, connecting_sockets[0], OOP_EXCEPTION); +static int xwaitpid(pid_t *pid, const char *what) { + int status; + + r= kill(*pid, SIGKILL); + if (r) sysdie("cannot kill %s child", what); + + pid_t got= waitpid(*pid, &status, WNOHANG); + if (got==-1) sysdie("cannot reap %s child", what); + + *pid= 0; + + return status; +} + +static void check_isreg(const struct stat *stab, const char *path, + const char *what) { + if (!S_ISREG(stab->st_mode)) + die("%s %s not a plain file (mode 0%lo)", + what, path, (unsigned long)stab->st_mode); +} + +static void xfstat(int fd, struct stat *stab_r, const char *what) { + int r= fstab(path, stab); + if (r) sysdie("could not fstat %s %s", what, path); +} + +static void xfstat_isreg(int fd, struct stat *stab_r, const char *what) { + xfstat(fd, stab_r, what); + check_isreg(stab, path, what); +} + +static void xlstat_isreg(const char *path, struct stat *stab, + int *enoent_r /* 0 means ENOENT is fatal */ + const char *what) { + int r= lstat(path, stab); + if (r) { + if (errno==ENOENT && enoent_r) { *enoent_r=1; return; } + sysdie("could not lstat %s %s", what, path); + } + if (enoent_r) *enoent_r= 0; + check_isreg(stab, path, what); +} + +static int samefile(const struct stat *a, const struct stat *b) { + assert(S_ISREG(a->st_mode)); + assert(S_ISREG(b->st_mode)); + return (a->st_ino == b->st_ino && + a->st_dev == b->st_dev); +} + +/*========== logging ==========*/ + +static void logcore(int sysloglevel, const char *fmt, ...) + __attribute__((printf,2,3)) +static void logcore(int sysloglevel, const char *fmt, ...) { + va_list al; + va_start(al,fmt); + if (become_daemon) { + vsyslog(sysloglevel,fmt,al); + } else { + vfprintf(stderr,fmt,al); + putc('\n',stderr); + } +} + +static void logv(int sysloglevel, const char *pfx, int errnoval, + int exitstatus, const char *fmt, va_list al) + __attribute__((printf,4,0)) +static void logv(int sysloglevel, const char *pfx, int errnoval, + int exitstatus, const char *fmt, va_list al) { + char msgbuf[256]; + vsnprintf(msgbuf,sizeof(msgbuf), fmt,al); + msgbuf[sizeof(msgbuf)-1]= 0; + + if (sysloglevel >= LOG_ERR && (errnoval==EACCES || errnoval==EPERM)) + sysloglevel= LOG_ERR; /* run by wrong user, probably */ + + logcore(sysloglevel, "<%s>%s: %s%s%s", + sitename, pfx, msgbuf, + errnoval>=0 ? ": " : "", + errnoval>=0 ? strerror(errnoval) : ""); +} + +#define logwrap(fn, pfx, sysloglevel, errno, estatus) \ + static void fn(const char *fmt, ...) \ + __attribute__((printf,1,2)); \ + static void fn(const char *fmt, ...) { \ + va_list al; \ + va_start(al,fmt); \ + logv(sysloglevel, pfx, errno, estatus, fmt, al); \ } + +logwrap(sysdie, " critical", LOG_CRIT, errno, 16); +logwrap(die, " critical", LOG_CRIT, -1, 16); + +logwrap(sysfatal, " fatal", LOG_ERR, errno, 12); +logwrap(fatal, " fatal", LOG_ERR, -1, 12); + +logwrap(syswarn, " warning", LOG_WARN, errno, 0); +logwrap(warn, " warning", LOG_WARN, -1, 0); + +logwrap(notice, "", LOG_NOTICE, -1, 0); +logwrap(info, " info", LOG_INFO, -1, 0); +logwrap(debug, " debug", LOG_DEBUG, -1, 0); + + +/*========== making new connections ==========*/ + +static int connecting_sockets[2]= {-1,-1}; +static pid_t connecting_child; + +static void connect_attempt_discard(void) { + if (connecting_sockets[0]) + cancel_fd(connecting_sockets[0]); + perhaps_close(&connecting_sockets[0]); perhaps_close(&connecting_sockets[1]); if (connecting_child) { - int status; - r= kill(connecting_child, SIGKILL); - if (r) sysdie("cannot kill connect child"); - - pid_t got= waitpid(connecting_child, &status, WNOHANG); - if (got==-1) sysdie("cannot reap connect child"); + int status= xwaitpid(&connecting_child, "connect"); if (!(WIFEXITED(status) || - (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL))) { - report_child_status("connect" - } - connecting_child= 0; + (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL))) + report_child_status("connect", status); } } @@ -177,8 +505,9 @@ static void connect_attempt_discard(void) { static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) { Conn *conn= 0; - conn= xcalloc(sizeof(*conn)); - + conn= xmalloc(sizeof(*conn)); + memset(conn,0,sizeof(*conn)); + DECL_MSG_CMSG(msg); struct cmsghdr *h= 0; ssize_t rs= recvmsg(fd, &msg, MSG_DONTWAIT); @@ -191,8 +520,8 @@ static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) { connecting_child= 0; if (WIFEXITED(status) && (WEXITSTATUS(status) != 0 - WEXITSTATUS(status) != CHILD_ESTATUS_STREAM && - WEXITSTATUS(status) != CHILD_ESTATUS_NOSTREAM)) { + WEXITSTATUS(status) != CONNCHILD_ESTATUS_STREAM && + WEXITSTATUS(status) != CONNCHILD_ESTATUS_NOSTREAM)) { /* child already reported the problem */ } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALARM) { warn("connect: connection attempt timed out"); @@ -234,10 +563,10 @@ static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) { if (!WIFEXITED(status)) { report_child_status("connect",status); goto x; } int es= WEXITSTATUS(status); switch (es) { - case CHILD_ESTATUS_STREAM: conn->stream= 1; break; - case CHILD_ESTATUS_NOSTREAM: conn->stream= 0; break; + case CONNCHILD_ESTATUS_STREAM: conn->stream= 1; break; + case CONNCHILD_ESTATUS_NOSTREAM: conn->stream= 0; break; default: - die("connect: child gave unexpected exit status %d", es); + fatal("connect: child gave unexpected exit status %d", es); } set nonblocking; @@ -246,7 +575,7 @@ static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) { LIST_ADDHEAD(idle, conn); notice(CN "connected %s", conn->fd, conn->stream ? "streaming" : "plain"); connect_attempt_discard(); - process_queue(); + check_master_queue(); return 0; x: @@ -267,16 +596,12 @@ static void connect_start() { r= socketpair(AF_UNIX, SOCK_STREAM, 0, connecting_sockets); if (r) { syswarn("connect: cannot create socketpair for child"); goto x; } - connecting_child= fork(); - if (connecting_child==-1) { syswarn("connect: cannot fork"); goto x; } + connecting_child= xfork("connection"); if (!connecting_child) { FILE *cn_from, *cn_to; char buf[NNTP_STRLEN+100]; - int exitstatus= CHILD_ESTATUS_NOSTREAM; - - put sigpipe back; - close unwanted fds; + int exitstatus= CONNCHILD_ESTATUS_NOSTREAM; r= close(connecting_sockets[0]); if (r) sysdie("connect: close parent socket in child"); @@ -285,29 +610,29 @@ static void connect_start() { if (NNTPconnect(remote_host, port, &cn_from, &cn_to, buf) < 0) { if (buf[0]) { sanitise_inplace(buf); - die("connect: rejected: %s", buf); + fatal("connect: rejected: %s", buf); } else { - sysdie("connect: connection attempt failed"); + sysfatal("connect: connection attempt failed"); } } if (NNTPsendpassword(remote_host, cn_from, cn_to) < 0) - sysdie("connect: authentication failed"); + sysfatal("connect: authentication failed"); if (try_stream) { if (fputs("MODE STREAM\r\n", cn_to) || fflush(cn_to)) - sysdie("connect: could not send MODE STREAM"); + sysfatal("connect: could not send MODE STREAM"); buf[sizeof(buf)-1]= 0; if (!fgets(buf, sizeof(buf)-1, cn_from)) { if (ferror(cn_from)) - sysdie("connect: could not read response to MODE STREAM"); + sysfatal("connect: could not read response to MODE STREAM"); else - die("connect: connection close in response to MODE STREAM"); + fatal("connect: connection close in response to MODE STREAM"); } int l= strlen(buf); assert(l>=1); if (buf[-1]!='\n') { sanitise_inplace(buf); - die("connect: response to MODE STREAM is too long: %.100s...", + fatal("connect: response to MODE STREAM is too long: %.100s...", remote_host, buf); } l--; if (l>0 && buf[1-]=='\r') l--; @@ -316,11 +641,11 @@ static void connect_start() { int rcode= strtoul(buf,&ep,10); if (ep != buf[3]) { sanitise_inplace(buf); - die("connect: bad response to MODE STREAM: %.50s", buf); + fatal("connect: bad response to MODE STREAM: %.50s", buf); } switch (rcode) { case 203: - exitstatus= CHILD_ESTATUS_STREAM; + exitstatus= CONNCHILD_ESTATUS_STREAM; break; case 480: case 500: @@ -351,51 +676,142 @@ static void connect_start() { r= close(connecting_sockets[1]); connecting_sockets[1]= 0; if (r) sysdie("connect: close child socket in parent"); - loop->on_fd(loop, connecting_sockets[0], OOP_READ, connchild_event, 0); - loop->on_fd(loop, connecting_sockets[0], OOP_EXCEPTION, connchild_event, 0); + on_fd_read_except(connecting_sockets[0], connchild_event); return OOP_CONTINUE; x: connect_attempt_discard(); } + /*========== overall control of article flow ==========*/ - -static void process_queue() { + +static void check_master_queue(void) { if (!queue.count) return; - if (working.head) { - transmit(working.head); - } else if (idle.head) { - transmit(idle.head); - } else if (nconns < maxconns && queue.count >= max_queue_per_conn && - !connecting_child && !connect_delay) { - connect_delay= reconnect_delay_periods; - connect_start(); + Conn *last_assigned=0; + for (;;) { + if (working.head) { + conn_assign_one_article(&working, &last_assigned); + } else if (idle.head) { + conn_assign_one_article(&idle, &last_assigned); + } else if (nconns < maxconns && queue.count >= max_queue_per_conn && + !connecting_child && !connect_delay) { + connect_delay= reconnect_delay_periods; + connect_start(); + } else { + break; + } } -} - -/*========== article transmission ==========*/ + conn_check_work(last_assigned); +} + +static void conn_assign_one_article(LIST(Conn) *connlist, + Conn **last_assigned) { + Conn *conn= connlist->head; + + LIST_REMOVE(*connlist, conn); + Article *art= LIST_REMHEAD(queue); + LIST_ADDTAIL(conn->queue, art); + LIST_ADD(*conn_determine_right_list(conn), conn); + + /* This slightly odd arrangement is so that we call conn_check_work + * once after filling the queue for a new connection in + * check_master_queue, rather than for each article. */ + if (conn != *last_assigned && *last_assigned) + conn_check_work(*last_assigned); + *last_assigned= conn; +} -static void *conn_writeable() { +static int conn_total_queued_articles(Conn *conn) { + return conn->sent.count + conn->queue.count; +} + +static LIST(Conn) *conn_determine_right_list(Conn *conn) { + int inqueue= conn_total_queued_articles(conn); + assert(inqueue <= max_queue); + if (inqueue == 0) return &idle; + if (inqueue == conn->max_queue) return &full; + return &working; +} + +static void *conn_writeable(oop_source *l, int fd, int ev, void *u) { + check_conn_work(u); + return OOP_CONTINUE; +} + +static void conn_check_work(Conn *conn) { + void *rp= 0; for (;;) { + conn_make_some_xmits(conn); if (!conn->xmitu) { - perhaps_transmit_on(conn); - if (!conn->xmitu) { - unlink from readable; - break; - } + loop->cancel_fd(loop, conn->fd, OOP_WRITE); + return; + } + + void *rp= conn_write_some_xmits(conn); + if (rp==OOP_CONTINUE) { + loop->on_fd(loop, conn->fd, OOP_WRITE, conn_writeable, conn); + return; + } else if (rp==OOP_HALT) { + return; + } else if (!rp) { + /* transmitted everything */ + } else { + abort(); } + } +} + + +/*========== article transmission ==========*/ + +static XmitDetails *xmit_core(Conn *conn, const char *data, int len, + XmitKind kind) { /* caller must then fill in details */ + struct iovec *v= &conn->xmit[conn->xmitu]; + XmitDetails *d= &conn->xmitd[conn->xmitu++]; + v->iov_base= data; + v->iov_len= len; + d->kind= kind; + return d; +} + +static void xmit_noalloc(Conn *conn, const char *data, int len) { + xmit_core(conn,data,len, xk_Const); +} +#define XMIT_LITERAL(lit) (xmit_noalloc(conn, (lit), sizeof(lit)-1)) +static void xmit_artbody(Conn *conn, ARTHANDLE *ah /* consumed */) { + XmitDetails *d= xmit_core(conn, ah->data, ah->len, sk_Artdata); + d->info.sm_art= ah; +} + +static void xmit_free(XmitDetails *d) { + switch (d->kind) { + case xk_Malloc: free(d->info.malloc_tofree); break; + case xk_Artdata: SMfreearticle(d->info.sm_art); break; + case xk_Const: break; + default: abort(); + } +} + +static void *conn_write_some_xmits(Conn *conn) { + /* return values: + * 0: nothing more to write, no need to call us again + * OOP_CONTINUE: more to write but fd not writeable + * OOP_HALT: disaster, have destroyed conn + */ + for (;;) { int count= conn->xmitu; + if (!count) return 0; + if (count > IOV_MAX) count= IOV_MAX; ssize_t rs= writev(conn->fd, conn->xmit, count); if (rs < 0) { - if (errno == EAGAIN) break; - syswarn(CN "write failed", conn->fd); - conn_failed(conn); - break; + if (errno == EAGAIN) return OOP_CONTINUE; + connfail(conn, "write failed: %s", strerror(errno)); + return OOP_HALT; } assert(rs > 0); @@ -415,106 +831,1416 @@ static void *conn_writeable() { memmove(conn->xmitd, conn->xmitd + done, newu * sizeof(*conn->xmitd)); conn->xmitu= newu; } - - return OOP_CONTINUE; -} - -static void transmit(Conn *conn) { - int inqueue= conn->sent.count + !!conn->send + conn->queue.count; - assert(inqueue < max_queue); - Article *art= LIST_REMHEAD(queue); - LIST_ADDTAIL(conn->queue, art); - if (inqueue == 0) { - LIST_REMOVE(idle, conn); - if (conn->max_queue==1) LIST_ADD(full, conn); - else LIST_ADD(working, conn); - } else if (inqueue == max_queue-1) { - LIST_REMOVE(working, conn); - LIST_ADD(full, conn); - } - perhaps_transmit_on(conn); } -static void perhaps_transmit_on(Conn *conn) { +static void conn_make_some_xmits(Conn *conn) { for (;;) { - if (conn->send) { - /* do something about this article text */ - continue; - } - if (conn->xmitu+3 > xmita) - /* no space for a CHECK even */ - return; + if (conn->xmitu+5 > CONNIOVS) + break; + + Article *art= LIST_REMHEAD(queue); + if (!art) break; - Article *art= LIST_REMHEAD(conn->queue); - if (art) return; + if (art->checked || (conn->stream && nocheck)) { + /* actually send it */ + + ARTHANDLE *artdata= SMretrieve(); - if (art->checked || conn->nocheck) { if (conn->stream) { - XMIT_LITERAL("TAKETHIS "); - xmit_noalloc(art->mid, art->midlen); - XMIT_LITERAL("\r\n"); + if (artdata) { + XMIT_LITERAL("TAKETHIS "); + xmit_noalloc(conn, art->mid, art->midlen); + XMIT_LITERAL("\r\n"); + xmit_artbody(conn, artdata); + } } else { - /* we got 235 */ + /* we got 235 from IHAVE */ + if (artdata) { + xmit_artbody(conn, artdata); + } else { + XMIT_LITERAL(".\r\n"); + } } - conn->send= art; + + art->sent= 1; + LIST_ADDTAIL(conn->sent, art); + + art->ipf->counts[art->checked].sent++; + } else { - if (conn->stream) XMIT_LITERAL("IHAVE "); - else XMIT_LITERAL("CHECK "); + /* check it */ + + if (conn->stream) + XMIT_LITERAL("IHAVE "); + else + XMIT_LITERAL("CHECK "); xmit_noalloc(art->mid, art->midlen); XMIT_LITERAL("\r\n"); + LIST_ADDTAIL(conn->sent, art); + art->ipf->counts[art->checked].offered++; } } } - - - if (conn->queue.head) { - if (conn->queue.checked || conn->nocheck) { - - && conn->xmitu+3 <= xmita) { - if ( - XMIT(" - if (conn->xmitu < xmita - - if (!queue - +/*========== handling responses from peer ==========*/ +static const oop_rd_style peer_rd_style= { + OOP_RD_DELIM_STRIP, '\n', + OOP_RD_NUL_FORBID, + OOP_RD_SHORTREC_FORBID +}; +static void *peer_rd_err(oop_source *lp, oop_read *oread, oop_event ev, + const char *errmsg, int errnoval, + const char *data, size_t recsz, void *conn_v) { + Conn *conn= conn_v; + connfail(conn, "error receiving from peer: %s", errmsg); + return OOP_CONTINUE; +} - - int circ_used= circ_write - circ_read; - if (circ_used < 0) circ_used += CONNBUFSZ; - writeable_moredata(conn, CONNBUFSZ-1 - circ_used); +static Article *article_reply_check(Connection *conn, const char *response, + int code_indicates_streaming, + const char *sanitised_response) { + Article *art= LIST_REMHEAD(conn->sent); - if (conn->circ_read == conn->circ_write) - return OOP_CONTINUE; + if (!art) { + connfail(conn, + "peer gave unexpected response when no commands outstanding: %s", + sanitised_response); + return 0; + } - struct iovec iov[2]; - int niov= 1; - iov[0].iov_base= conn->circ_buf + conn->circ_read; - if (conn->circ_read > conn->circ_write) { /* wrapped */ - iov[0].iov_len= CONNBUFSZ - conn->circ_read; - iov[1].iov_base= conn->circ_buf; - iov[1].iov_len= conn->circ_write; - if (niov[1].iov_len) niov= 2; - } else { - iov[0].iov_len= conn->circ_write - conn->circ_read; + if (code_indicates_streaming) { + assert(!memchr(response, 0, 4)); /* ensured by peer_rd_ok */ + if (!conn->stream) { + connfail("peer gave streaming response code " + " to IHAVE or subsequent body: %s", sanitised_response); + return 0; } - ssize_t rs= writev(conn->fd, &iov, niov); - if (rs < 0) { - + const char *got_mid= response+4; + int got_midlen= strcspn(got_mid, " \n\r"); + if (got_midlen<3 || got_mid[0]!='<' || got_mid[got_midlen-1]!='>') { + connfail("peer gave streaming response with syntactically invalid" + " messageid: %s", sanitised_response); + return 0; } - assert(rs > 0); + if (got_midlen != art->midlen || + memcmp(got_mid, art->messageid, got_midlen)) { + connfail("peer gave streaming response code to wrong article -" + " probable synchronisation problem; we offered: %s;" + " peer said: %s", + art->messageid, sanitised_response); + return 0; + } + } else { + if (conn->stream) { + connfail("peer gave non-streaming response code to CHECK/TAKETHIS: %s", + sanitised_response); + return 0; + } + } + + return art; +} - conn->circ_read += rs; - if (conn->circ_read > CONNBUFSZ) - conn->circ_read -= CONNBUFSZ; +static void update_nocheck(int accepted) { + accept_proportion *= accept_decay; + accept_proportion += accepted; + nocheck= accept_proportion >= nocheck_thresh; + if (nocheck && !nocheck_reported) { + notice("entering nocheck mode for the first time"); + nocheck_reported= 1; } } +static void article_done(Connection *conn, Article *art, int whichcount) { + *count++; + art->ipf->counts.articles[art->checked][whichcount]++; + if (whichcount == RC_accepted) update_nocheck(1); + else if (whichcount == RC_unwanted) update_nocheck(0); + + InputFile *ipf= art->ipf; + while (art->blanklen) { + static const char spaces[]= + " " + " " + " " + " "; + int w= art->blanklen; if (w >= sizeof(spaces)) w= sizeof(spaces)-1; + int r= pwrite(ipf->fd, spaces, w, art->offset); + if (r==-1) { + if (errno==EINTR) continue; + sysdie("failed to blank entry for %s (length %d at offset %lu) in %s", + art->messageid, art->blanklen, art->offset, ipf->path); + } + assert(r>=0 && r<=w); + art->blanklen -= w; + art->offset += w; + } -main { - ignore sigpipe; -}; + ipf->inprogress--; + assert(ipf->inprogress >= 0); + + if (!ipf->inprogress) + loop->on_time(loop, OOP_TIME_NOW, statemc_check_input_done, ipf); + + free(art); +} + +static void *peer_rd_ok(oop_source *lp, oop_read *oread, oop_event ev, + const char *errmsg, int errnoval, + const char *data, size_t recsz, void *conn_v) { + Conn *conn= conn_v; + + if (ev == OOP_RD_EOF) { + connfail(conn, "unexpected EOF from peer"); + return OOP_CONTINUE; + } + assert(ev == OOP_RD_OK); + + char *ep; + unsigned long code= strtoul(data, &ep, 10); + if (ep != data+3 || *ep != ' ' || data[0]=='0') { + char sanibuf[100]; + const char *p= data; + char *q= sanibuf; + *q++= '`'; + for (;;) { + if (q > sanibuf+sizeof(sanibuf)-8) { strcpy(q,"..."); break; } + int c= *p++; + if (!c) { *q++= '\''; break; } + if (c>=' ' && c<=126 && c!='\\') { *q++= c; continue; } + sprintf(q,"\\x%02x",c); + q += 4; + } + connfail(conn, "badly formatted response from peer: %s", sanibuf); + return OOP_CONTINUE; + } + + if (conn->quitting) { + if (code!=205) { + connfail(conn, "peer gave failure response to QUIT: %s", sani); + return OOP_CONTINUE; + } + conn close ok; + return; + } + + Article *art; + +#define GET_ARTICLE \ + art= article_reply_check(conn, data, code_streaming, sani); \ + if (art) ; else return OOP_CONTINUE /* reply_check has failed the conn */ + +#define ARTICLE_DEALTWITH(streaming,how) \ + code_streaming= (streaming) \ + GET_ARTICLE; \ + article_done(conn, art, RC_##how); break; + +#define PEERBADMSG(m) connfail(conn, m ": %s", sani); return OOP_CONTINUE + + int code_streaming= 0; + + switch (code) { + + case 400: PEERBADMSG("peer stopped accepting articles"); + case 503: PEERBADMSG("peer timed us out"); + default: PEERBADMSG("peer sent unexpected message"); + + case 435: ARTICLE_DEALTWITH(0,unwanted); /* IHAVE says they have it */ + case 438: ARTICLE_DEALTWITH(1,unwanted); /* CHECK/TAKETHIS: they have it */ + + case 235: ARTICLE_DEALTWITH(0,accepted); /* IHAVE says thanks */ + case 239: ARTICLE_DEALTWITH(1,accepted); /* TAKETHIS says thanks */ + + case 437: ARTICLE_DEALTWITH(0,rejected); /* IHAVE says rejected */ + case 439: ARTICLE_DEALTWITH(1,rejected); /* TAKETHIS says rejected */ + + case 238: /* CHECK says send it */ + code_streaming= 1; + case 335: /* IHAVE says send it */ + GET_ARTICLE; + count_checkedwanted++; + LIST_ADDTAIL(conn->queue); + if (art->checked) { + connfail("peer gave %d response to article body: %s",code, sani); + return OOP_CONTINUE; + } + art->checked= 1; + break; + + case 431: /* CHECK or TAKETHIS says try later */ + code_streaming= 1; + case 436: /* IHAVE says try later */ + GET_ARTICLE; + open_defer(); + if (fprintf(defer, "%s %s\n", TokenToText(art->token), art->messageid) <0 + || fflush(defer)) + sysfatal("write to defer file %s",path_defer); + article_done(conn, art, RC_deferred); + break; + + } + + check_check_work(conn); + return OOP_CONTINUE; +} + + +/*========== monitoring of input files ==========*/ + +static void feedfile_eof(InputFile *ipf) { + assert(ipf != main_input_file); /* promised by tailing_try_read */ + + inputfile_tailing_stop(ipf); + + if (ipf == backlog_input_file) { + assert(ipf->fd >= 0); + if (close(ipf->fd)) sysdie("could not close backlog file %s", ipf->path); + ipf->fd= -1; + return; + } + + assert(ipf == flushing_input_file); + + inputfile_tailing_stop(ipf); + assert(ipf->fd >= 0); + if (close(ipf->fd)) sysdie("could not close input file %s", ipf->path); + ipf->fd= -1; + + assert(sms==sm_SEPARATED || sms==sm_DROPPING); + + if (main_input_file) + inputfile_tailing_start(main_input_file); +} + +static InputFile *open_input_file(const char *path) { + int fd= open(path, O_RDONLY); + if (fd<0) { + if (errno==ENOENT) return 0; + sysfatal("unable to open input file %s", path); + } + + InputFile *ipf= xmalloc(sizeof(*ipf) + strlen(path) + 1); + memset(ipf,0,sizeof(*ipf)); + + ipf->readable.on_readable= tailing_on_readable; + ipf->readable.on_cancel= tailing_on_cancel; + ipf->readable.try_read= tailing_try_read; + + ipf->fd= fd; + strcpy(ipf->path, path); + + return ipf; +} + +static void close_input_file(InputFile *ipf) { + assert(!ipf->readable_callback); /* must have had ->on_cancel */ + assert(!ipf->filemon); /* must have had inputfile_tailing_stop */ + assert(!ipf->rd); /* must have had inputfile_tailing_stop */ + assert(!ipf->inprogress); /* no dangling pointers pointing here */ + + if (ipf->fd >= 0) + if (close(ipf->fd)) sysdie("could not close input file %s", ipf->path); + + free(ipf); +} + + +/*---------- dealing with articles read in the input file ----------*/ + +typedef void *feedfile_got_article(oop_source *lp, oop_read *rd, + oop_rd_event ev, const char *errmsg, + int errnoval, + const char *data, size_t recsz, + void *ipf_v) { + InputFile *ipf= ipf_v; + Article *art; + char tokentextbuf[sizeof(TOKEN)*2+3]; + + if (!data) { feedfile_eof(ipf); return OOP_CONTINUE; } + + if (data[0] && data[0]!=' ') { + char *space= strchr(data,' '); + int tokenlen= space-data; + int midlen= (int)recsz-tokenlen-1; + if (midlen < 0) goto bad_data; + + if (tokenlen != sizeof(TOKEN)*2+2) goto bad_data; + memcpy(tokentextbuf, data, tokenlen); + tokentextbuf[tokenlen]= 0; + if (!IsToken(tokentextbuf)) goto bad_data; + + art= xmalloc(sizeof(*art) - 1 + midlen + 1); + art->offset= ipf->offset; + art->blanklen= recsz; + art->midlen= midlen; + art->checked= art->sentbody= 0; + art->ipf= ipf; ipf->inprogress++; + art->token= TextToToken(tokentextbuf); + strcpy(art->messageid, space+1); + LIST_ADDTAIL(queue, art); + } + ipf->offset += recsz + 1; + + if (sms==sm_NORMAL && ipf==main_input_file && + (ipf->offset >= flush_threshold || !until_spontaneous_flush) { + + notice("starting flush (%lu >= %lu)", + (unsigned long)ipf->offset, (unsigned long)flush_threshold); + + int r= link(feedfile, duct_path); + if (r) sysdie("link feedfile %s to flushing file %s", feedfile, dut_path); + /* => Hardlinked */ + + r= unlink(feedfile); + if (r) sysdie("unlink old feedfile link %s", feedfile); + /* => Moved */ + + spawn_inndcomm_flush(); /* => Flushing, sets sms to sm_FLUSHING */ + } + + check_master_queue(); +} + + +/*========== tailing input file ==========*/ + +static void filemon_start(InputFile *ipf) { + assert(!ipf->filemon); + + ipf->filemon= xmalloc(sizeof(*ipf->filemon)); + memset(ipf->filemon, 0, sizeof(*ipf->filemon)); + filemon_method_startfile(ipf, ipf->filemon); +} + +static void filemon_stop(InputFile *ipf) { + if (!ipf->filemon) return; + filemon_method_stopfile(ipf, ipf->filemon); + free(ipf->filemon); + ipf->filemon= 0; +} + +static void filemon_callback(InputFile *ipf) { + ipf->readable_callback(ipf->readable_callback_user); +} + +static void *tailing_rable_call_time(oop_source *loop, struct timeval tv, + void *user) { + InputFile *ipf= user; + return ipf->readable_callback(ipf->readable_callback_user); +} + +static void on_cancel(struct oop_readable *rable) { + InputFile *ipf= (void*)rable; + + if (ipf->filemon) filemon_stopfile(ipf); + loop->cancel_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf); + ipf->readable_callback= 0; +} + +static int tailing_on_readable(struct oop_readable *rable, + oop_readable_call *cb, void *user) { + InputFile *ipf= (void*)rable; + + tailing_on_cancel(rable); + ipf->readable_callback= cb; + ipf->readable_callback_user= user; + filemon_startfile(ipf); + + loop->on_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf); + return 0; +} + +static ssize_t tailing_try_read(struct oop_readable *rable, void *buffer, + size_t length) { + InputFile *ipf= (void*)rable; + for (;;) { + ssize_t r= read(ipf->fd, buffer, length); + if (r==-1) { + if (errno==EINTR) continue; + return r; + } + if (!r) { + if (ipf==main_input_file) { + errno=EAGAIN; + return -1; + } else if (ipf==flushing_input_file) { + assert(ipf->fd>=0); + assert(sms==sm_SEPARATED || sms==sm_DROPPING); + } else if (ipf==backlog_input_file) { + assert(ipf->fd>=0); + } else { + abort(); + } + } + return r; + } +} + +/*---------- filemon implemented with inotify ----------*/ + +#if defined(HAVE_INOTIFY) && !defined(HAVE_FILEMON) +#define HAVE_FILEMON + +#include + +static int filemon_inotify_fd; +static int filemon_inotify_wdmax; +static InputFile **filemon_inotify_wd2ipf; + +typedef struct Filemon_Perfile { + int wd; +} Filemon_Inotify_Perfile; + +static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { + int wd= inotify_add_watch(filemon_inotify_fd, ipf->path, IN_MODIFY); + if (wd < 0) sysdie("inotify_add_watch %s", ipf->path); + + if (wd >= filemon_inotify_wdmax) { + int newmax= wd+2; + filemon_inotify_wd= xrealloc(filemon_inotify_wd2ipf, + sizeof(*filemon_inotify_wd2ipf) * newmax); + memset(filemon_inotify_wd2ipf + filemon_inotify_wdmax, 0, + sizeof(*filemon_inotify_wd2ipf) * (newmax - filemon_inotify_wdmax)); + filemon_inotify_wdmax= newmax; + } + + assert(!filemon_inotify_wd2ipf[wd]); + filemon_inotify_wd2ipf[wd]= ipf; + + debug("filemon inotify startfile %p wd=%d wdmax=%d", + ipf, wd, filemon_inotify_wdmax); + + pf->wd= wd; +} + +static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { + int wd= pf->wd; + debug("filemon inotify stopfile %p wd=%d", ipf, wd); + int r= inotify_rm_watch(filemon_inotify_fd, filemon_inotify_wd); + if (r) sysdie("inotify_rm_watch"); + filemon_inotify_wd2ipf[wd]= 0; +} + +static void *filemon_inotify_readable(oop_source *lp, int fd, + oop_event e, void *u) { + struct inotify_event iev; + for (;;) { + int r= read(filemon_inotify_fd, &iev, sizeof(iev)); + if (r==-1) { + if (errno==EAGAIN) break; + sysdie("read from inotify master"); + } else if (r==sizeof(iev)) { + assert(iev.wd >= 0 && iev.wd < filemon_inotify_wdmax); + } else { + die("inotify read %d bytes wanted struct of %d", r, (int)sizeof(iev)); + } + InputFile *ipf= filemon_inotify_wd2ipf[iev.wd]; + debug("filemon inotify readable read %p wd=%p", iev.wd, ipf); + filemon_callback(ipf); + } + return OOP_CONTINUE; +} + +static int filemon_method_init(void) { + filemon_inotify_fd= inotify_init(); + if (filemon_inotify_fd<0) { + syswarn("could not initialise inotify: inotify_init failed"); + return 0; + } + set nonblock; + loop->on_fd(loop, filemon_inotify_fd, OOP_READ, filemon_inotify_readable); + + debug("filemon inotify init filemon_inotify_fd=%d", filemon_inotify_fd); + return 1; +} + +#endif /* HAVE_INOTIFY && !HAVE_FILEMON *// + +/*---------- filemon dummy implementation ----------*/ + +#if !defined(HAVE_FILEMON) + +typedef struct Filemon_Perfile { int dummy; } Filemon_Dummy_Perfile; + +static int filemon_method_init(void) { return 0; } +static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { } +static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { } + +#endif /* !HAVE_FILEMON */ + +/*---------- interface to start and stop an input file ----------*/ + +static const oop_rd_style feedfile_rdstyle= { + OOP_RD_DELIM_STRIP, '\n', + OOP_RD_NUL_FORBID, + OOP_RD_SHORTREC_EOF, +}; + +static void inputfile_tailing_start(InputFile *ipf) { + assert(!ipf->fd); + ipf->readable->on_readable= tailing_on_readable; + ipf->readable->on_cancel= tailing_on_cancel; + ipf->readable->try_read= tailing_try_read; + ipf->readable->delete_tidy= 0; /* we never call oop_rd_delete_{tidy,kill} */ + ipf->readable->delete_kill= 0; + + ipf->readable_callback= 0; + ipf->readable_callback_user= 0; + + ipf->rd= oop_rd_new(loop, &ipf->readable, 0,0); + assert(ipf->fd); + + int r= oop_rd_read(ipf->rd, &feedfile_rdstyle, MAX_LINE_FEEDFILE, + feedfile_got_article,ipf, feedfile_problem,ipf); + if (r) sysdie("unable start reading feedfile %s",ipf->path); +} + +static void inputfile_tailing_stop(InputFile *ipf) { + assert(ipf->fd); + oop_rd_cancel(ipf->rd); + oop_rd_delete(ipf->rd); + ipf->rd= 0; + assert(!ipf->filemon); /* we shouldn't be monitoring it now */ +} + + +/*========== interaction with innd - state machine ==========*/ + +/* See official state diagram at top of file. We implement + * this as follows: + + ================ + WAITING + [Nothing/Noduct] + poll for F + ================ + | + | TIMEOUT and no defer, no backlog + |`--------------------------. + | | + | OPEN F SUCCEEDS | exit + ,--------->| V + | V ========= + | ======== (ESRCH) + | NORMAL [Dropped] + | [Normal] ========= + | main F tail + | ======== + | | + | | F IS SO BIG WE SHOULD FLUSH + ^ | hardlink F to D + | [Hardlinked] + | | unlink F + | | our handle onto F is now onto D + | [Moved] + | | + | |<---------------------------------------------------. + | | | + | | spawn inndcomm flush | + | V | + | ========== | + | FLUSHING | + | [Flushing] | + | main D tail | + | ========== | + | | | + | | INNDCOMM FLUSH FAILS ^ + | |`----------------------->----------. | + | | | | + | | NO SUCH SITE V | + ^ |`--------------->----. =========== | + | | \ FLUSHFAIL | + | | \ [Moved] | + | | \ main D tail | + | | \ =========== | + | | \ | | + | | \ | TIME TO RETRY | + | | \ `----------------' + | | FLUSH OK \ + | | open F \ + | V V + | ============= ============ + | SEPARATED/ DROPPING/ + | old->fd>=0 old->fd>=0 + | [Separated] [Dropping] + | main F idle main none + | old D tail old D tail + | ============= ============ + | | | + ^ | EOF ON D | EOF ON D + | V V + | =============== =============== + | SEPARATED/ DROPPING/ + | old->fd==-1 old->fd==-1 + | [Finishing] [Dropping] + | main F tail main none + | old D closed old D closed + | =============== =============== + | | | + | | ALL D PROCESSED | ALL D PROCESSED + | V install defer as backlog V install defer as backlog + ^ | close D | close D + | | unlink D | unlink D + | | | exit + `----------' V + ========== + (ESRCH) + [Droppped] + ========== + */ + +static void statemc_init(void) { + struct stat stab, stabf; + int noent; + + path_lock= xasprintf("%s_lock", feedfile); + path_flushing= xasprintf("%s_flushing", feedfile); + path_defer= xasprintf("%s_defer", feedfile); + globpat_backlog= xasprintf("%s_backlog*", feedfile); + + for (;;) { + int lockfd= open(path_lock, O_CREAT|O_RDWR, 0600); + if (lockfd<0) sysfatal("open lockfile %s", path_lock); + + struct flock fl; + memset(&fl,0,sizeof(fl)); + fl.l_type= F_WRLCK; + fl.l_whence= SEEK_SET; + r= fcntl(lockfd, F_SETLK, &fl); + if (r==-1) { + if (errno==EACCES || errno==EAGAIN) { + if (quiet_if_locked) exit(0); + fatal("another duct holds the lockfile"); + } + sysdie("fcntl F_SETLK lockfile %s", path_lock); + } + + xfstat_isreg(lockfd, &stabf, "lockfile"); + xlstat_isreg(path_lock, &stab, &noent, "lockfile"); + + if (!noent && samefile(&stab, &stabf)) + break; + + if (close(lockfd)) + sysdie("could not close stale lockfile %s", path_lock); + } + debug("startup: locked"); + + search_backlog_file(); + + xlstat_isreg(path_defer, &stab, &noent, "defer file"); + if (noent) { + debug("startup: ductdefer ENOENT"); + } else { + debug("startup: ductdefer nlink=%ld", (long)stab.st_nlink); + switch (stab.st_nlink==1) { + case 1: + open_defer(); /* so that we will later close it and rename it */ + break; + case 2: + if (unlink(path_defer)) + sysdie("could not unlink stale defer file link %s (presumably" + " hardlink to backlog file)", path_defer); + break; + default: + die("defer file %s has unexpected link count %d", + path_defer, stab.st_nlink); + } + } + + InputFile *file_d= open_input_file(path_flushing); + + if (file_d) { + struct stat stab_f, stab_d; + + xlstat_isreg(feedfile, &stab_f, &noent, "feed file"); + if (noent) { + debug("startup: D exists, F ENOENT => Moved"); + goto found_moved; + } + + debug("startup: F and D both exist"); + + xfstat_isreg(file_d->fd, &stab_d, "flushing file"); + + if (samefile(&stab_d, &stab_f)) { + debug("startup: F==D => Hardlinked"); + r= unlink(path_flushing); + if (r) sysdie("unlink feed file %s during startup", feedfile); + found_moved: + debug(" => Moved"); + startup_set_input_file(file_d); + spawn_inndcomm_flush(); /* => Flushing, sets sms to sm_FLUSHING */ + } else { + debug("F!=D => Separated"); + SMS(SEPARATED, 0, "found both old and current feed files"); + startup_set_input_file(file_d); + } + } else { + debug("startup: D ENOENT => Nothing"); + fixme need to try flushing innd here - needs state diagram changes; + SMS(WAITING, open_wait_periods, "no feed file currently exists"); + } +} + +static void statemc_poll(void) { + if (sms==sm_WAITING) { statemc_waiting_poll(); return; } + + if (!sm_period_counter) return; + sm_period_counter--; + assert(sm_period_counter>=0); + + if (sm_period_counter) return; + switch (sms) { + case sm_WAITING: + fatal("timed out waiting for innd to create feed file %s", feedfile); + case sm_FLUSHFAIL: + spawn_inndcomm_flush(void); + break; + default: + abort(); + } +} + +static void statemc_waiting_poll(void) { + InputFile *file_f= open_input_file(feedfile); + if (!file_f) return; + startup_set_input_file(file_d); + SMS(NORMAL, 0, "found and opened feed file"); +} + +static void startup_set_input_file(InputFile *f) { + assert(!main_input_file); + main_input_file= f; + until_spontaneous_flush= spontaneous_flush_periods; + inputfile_tailing_start(f); +} + +static void *statemc_check_input_done(oop_source *lp, + struct timeval now, void *ipf_v) { + InputFile *ipf= ipf_v; + struct stat stab; + + if (ipf->inprogress) return; /* new article in the meantime */ + if (ipf->fd >= 0); return; /* not had EOF */ + + if (ipf == backlog_input_file) { + notice_processed(ipf,"backlog file",ipf->path); + close_input_file(ipf); + if (unlink(ipf->path)) { + if (errno != ENOENT) + sysdie("could not unlink processed backlog file %s", ipf->path); + warn("backlog file %s vanished while we were reading it" + " so we couldn't remove it (but it's done now, anyway)", + ipf->path); + } + backlog_input_file= 0; + search_backlog_file(); + return; + } + + assert(ipf == flushing_input_file); + assert(sms==sm_SEPARATED || sms==sm_DROPPING); + + notice_processed(ipf,"feed file",0); + + close_defer(); + + if (unlink(path_flushing)) + sysdie("could not unlink old flushing file %s", path_flushing); + + if (sms==sm_DROPPING) { + if (search_backlog_file()) { + debug("feed dropped but still backlogs to process"); + return; + } + notice("feed dropped and our work is complete"); + r= unlink(path_lock); + if (r) sysdie("unlink lockfile for old feed %s", path_lock); + exit(0); + } + + open_defer(); + + close_input_file(flushing_input_file); + flushing_input_file= 0; + + notice("flush complete"); + SMS(NORMAL, 0, "flush complete"); +} + +static void statemc_setstate(StateMachineState newsms, int periods, + const char *forlog, const char *why) { + sms= newsms; + sm_period_counter= periods; + if (periods) { + info("%s[%d] %s",periods,forlog,why); + } else { + info("%s %s",forlog,why); + } +} + +/*---------- defer and backlog files ----------*/ + +static void open_defer(void) { + struct stat stab; + + if (defer) return; + + defer= fopen(path_defer, "a+"); + if (!defer) sysfatal("could not open defer file %s", path_defer); + + /* truncate away any half-written records */ + + xfstat_isreg(fileno(defer), &stab, "newly opened defer file"); + + if (stab.st_size > LONG_MAX) + die("defer file %s size is far too large", path_defer); + + if (!stab.st_size) + return; + + long orgsize= stab.st_size; + long truncto= stab.st_size; + for (;;) { + if (!truncto) break; /* was only (if anything) one half-truncated record */ + if (fseek(defer, truncto-1, SEEK_SET) < 0) + sysdie("seek in defer file %s while truncating partial", path_defer); + + r= getc(defer); + if (r==EOF) { + if (ferror(defer)) + sysdie("failed read from defer file %s", path_defer); + else + die("defer file %s shrank while we were checking it!", path_defer); + } + if (r=='\n') break; + truncto--; + } + + if (stab.st_size != truncto) { + warn("truncating half-record at end of defer file %s -" + " shrinking by %ld bytes from %ld to %ld", + path_defer, orgsize - truncto, orgsize, truncto); + + if (fflush(defer)) + sysfatal("could not flush defer file %s", path_defer); + if (ftruncate(fileno(defer), truncto)) + sysdie("could not truncate defer file %s", path_defer); + + } else { + info("continuing existing defer file %s (%ld bytes)", + path_defer, orgsize); + } + if (fseek(defer, truncto, SEEK_SET)) + sysdie("could not seek to new end of defer file %s", path_defer); +} + +static void close_defer(void) { + if (!defer) + return; + + xfstat(fileno(defer), &stab, "defer file"); + + if (fclose(defer)) sysfatal("could not close defer file %s", path_defer); + defer= 0; + + char *backlog= xasprintf("%s_backlog_%lu.%lu", feedfile, + (unsigned long)now.tv_sec, + (unsigned long)stab.st_ino); + if (link(path_defer, path_backlog)) + sysfatal("could not install defer file %s as backlog file %s", + path_defer, backlog); + if (unlink(path_defer)) + sysdie("could not unlink old defer link %s to backlog file %s", + path_defer, backlog); + + if (backlog_nextscan_periods < 0 || + backlog_nextscan_periods > backlog_retry_minperiods + 1) + backlog_nextscan_periods= backlog_retry_minperiods + 1; +} + +static void poll_backlog_file(void) { + if (backlog_nextscan_periods < 0) return; + if (backlog_nextscan_periods-- > 0) return; + search_backlog_file(); +} + +static int search_backlog_file(void) { + /* returns non-0 iff there are any backlog files */ + + glob_t gl; + int r; + struct stat stab; + const char *oldest_path=0; + time_t oldest_mtime, now; + + if (backlog_input_file) return 3; + + try_again: + + r= glob(globpat_backlog, GLOB_ERR|GLOB_MARK|GLOB_NOSORT, 0, &gl); + + switch (r) { + case GLOB_ABORTED: + sysdie("failed to expand backlog pattern %s", globpat_backlog); + case GLOB_NOSPACE: + die("out of memory expanding backlog pattern %s", globpat_backlog); + case 0: + for (i=0; i= 0 && + backlog_nextscan_periods > backlog_spontaneous_rescan_periods) + backlog_nextscan_periods= backlog_spontaneous_rescan_periods; + + debug("backlog scan: young age=%f deficiency=%ld nextscan=%d oldest=%s", + age, age_deficiency, backlog_nextscan_periods, oldest_path); + return 2; +} + +/*========== flushing the feed ==========*/ + +static pid_t inndcomm_child; + +static void *inndcomm_event(oop_source *lp, int fd, oop_event e, void *u) { + assert(inndcomm_child); + int status= xwaitpid(&inndcomm_child, "inndcomm"); + loop->cancel_fd(fd); + close(fd); + + assert(!flushing_input_file); + + if (WIFEXITED(status)) { + switch (WEXITSTATUS(status)) { + + case INNDCOMMCHILD_ESTATUS_FAIL: + goto failed; + + case INNDCOMMCHILD_ESTATUS_NONESUCH: + warn("feed has been dropped by innd, finishing up"); + flushing_input_file= main_input_file; + main_input_file= 0; + SMS(DROPPING, 0, "dropped by innd"); + return OOP_CONTINUE; + + case 0: + flushing_input_file= main_input_file; + main_input_file= open_input_file(feedfile); + if (!main_input_file) + die("flush succeeded but feedfile %s does not exist!", feedfile); + until_spontaneous_flush= spontaneous_flush_periods; + SMS(SEPARATED, 0, "feed file missing"); + return OOP_CONTINUE; + + default: + goto unexpected_exitstatus; + + } + } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) { + warn("flush timed out trying to talk to innd"); + goto failed; + } else { + unexpected_exitstatus: + report_child_status("inndcomm child", status); + } + + failed: + SMS(FLUSHFAIL, flushfail_retry_periods, "flush failed, will retry"); +} + +static void inndcommfail(const char *what) { + syswarn("error communicating with innd: %s failed: %s", what, ICCfailure); + exit(INNDCOMMCHILD_ESTATUS_FAIL); +} + +void spawn_inndcomm_flush(void) { + int pipefds[2]; + + assert(sms==sm_NORMAL || sms==sm_FLUSHFAIL); + assert(!inndcomm_child); + + if (pipe(pipefds)) sysdie("create pipe for inndcomm child sentinel"); + + inndcomm_child= xfork(); + + if (!inndcomm_child) { + static char flushargv[2]= { sitename, 0 }; + char *reply; + + close(pipefds[0]); + + alarm(inndcomm_flush_timeout); + r= ICCopen(); if (r) inndcommfail("connect"); + r= ICCcommand('f',flushargv,&reply); if (r<0) inndcommfail("transmit"); + if (!r) exit(0); /* yay! */ + + if (!strcmp(reply, "1 No such site")) exit(INNDCOMMCHILD_ESTATUS_NONESUCH); + syswarn("innd ctlinnd flush failed: innd said %s", reply); + exit(INNDCOMMCHILD_ESTATUS_FAIL); + } + + close(pipefds[1]); + int sentinel_fd= pipefds[0]; + on_fd_read_except(sentinel_fd, inndcomm_event); + + SMS(FLUSHING, 0, "flush is in progress"); +} + +/*========== main program ==========*/ + +static void postfork_inputfile(InputFile *ipf) { + if (!ipf) return; + assert(ipf->fd >= 0); + close(ipf->fd); + ipf->fd= -1; +} + +static void postfork_conns(Connection *conn) { + while (conn) { + close(conn->fd); + conn= conn->next; + } +} + +static void postfork_stdio(FILE *f) { + /* we have no stdio streams that are buffered long-term */ + if (f) fclose(f); +} + +static void postfork(const char *what) { + if (signal(SIGPIPE, SIG_DFL) == SIG_ERR) + sysdie("%s child: failed to reset SIGPIPE"); + + postfork_inputfile(main_input_file); + postfork_inputfile(flushing_input_file); + postfork_conns(idle.head); + postfork_conns(working.head); + postfork_conns(full.head); + postfork_stdio(defer); +} + +#define EVERY(what, interval, body) \ + static const struct timeval what##_timeout = { 5, 0 }; \ + static void what##_schedule(void); \ + static void *what##_timedout(oop_source *lp, struct timeval tv, void *u) { \ + { body } \ + what##_schedule(); \ + } \ + static void what##_schedule(void) { \ + loop->on_time(loop, what##_timeout, what##_timedout, 0); \ + } + +EVERY(filepoll, {5,0}, { + if (main_input_file && main_input_file->readable_callback) + filemon_callback(main_input_file); +}); + +#define DEBUGF_IPF(wh) " " #wh "=%p/%s:ip=%ld,off=%ld,fd=%d%s" \ +#define DEBUG_IPF(sh) \ + wh##_input_file, debug_ipf_path(wh##_input_file), \ + wh##_input_file->inprogress, (long)wh##_input_file->offset, \ + wh##_input_file->fd, wh##_input_file->rd ? "+" : "" +static const char *debug_ipf_path(InputFile *ipf) { + char *slash= strrchr(ipf->path,'/'); + return slash ? slash+1 : ipf->path; +} + +EVERY(period, {PERIOD_SECONDS,0}, { + debug("PERIOD" + " sms=%s queue=%d sm_period_counter=%d" + " connect_delay=%d until_spontaneous_flush=%d" + " input_files" DEBUGF_IPF(main) DEBUGF_IPF(old) DEBUGF_FMT(flushing) + " conns idle=%d working=%d full=%d" + " children connecting=%ld inndcomm_child" + , + sms_names[sms], queue.count, sm_period_counter, + connect_delay, until_spontaneous_flush, + DEBUG_IPF(main), DEBUG_IPF(flushing), DEBUG_IPF(flushing), + idle.count, working.count, full.count, + (long)connecting_child, (long)inndcomm_child + ); + if (connect_delay) connect_delay--; + if (until_spontaneous_flush) until_spontaneous_flush--; + poll_backlog_file(); + if (!backlog_input_file) close_defer(); /* want to start on a new backlog */ + statemc_poll(); + check_master_queue(); +}); + + +/*========== option parsing ==========*/ + +enum OptFlags { + of_seconds= 001000u; + of_boolean= 002000u; +}; + +typedef struct Option Option; +typedef void OptionParser(const Option*, const char *val); + +struct Option { + int short; + const char *long; + void *store; + OptionParser *fn; + int noarg; +}; + +void op_integer(const Option *o, const char *val) { + char *ep; + errno= 0; + unsigned long ul= strtoul(val,&ep,10); + if (*ep || ep==val || errno || ul>INT_MAX) + badusage("bad integer value for %s",o->long); + int *store= o->store; + *store= ul; +} + +void op_double(const Option *o, const char *val) { + int *store= o->store; + char *ep; + errno= 0; + *store= strtod(val, &ep); + if (*ep || ep==val || errno) + badusage("bad floating point value for %s",o->long); +} + +void op_string(const Option *o, const char *val) { + char **store= o->store; + free(*store); + *store= val; +} + +void op_seconds(const Option *o, const char *val) { + int *store= o->store; + char *ep; + + double v= strtod(val,&ep); + if (ep==val) badusage("bad time/duration value for %s",o->long); + + if (!*ep || !strcmp(ep,"s")) unit= 1; + else if (!strcmp(ep,"m")) unit= 60; + else if (!strcmp(ep,"h")) unit= 3600; + else if (!strcmp(ep,"d")) unit= 86400; + else badusage("bad units %s for time/duration value for %s",ep,o->long); + + v *= unit; + v= ceil(v); + if (v > INT_MAX) badusage("time/duration value for %s out of range",o->long); + *store= v; +} + +void op_periods_rndup(const Option *o, const char *val) { + int *store= o->store; + op_seconds(o,val); + *store += PERIOD_SECONDS-1; + *store /= PERIOD_SECONDS; +} + +void op_periods_booltrue(const Option *o, const char *val) { + int *store= o->store; + *store= 1; +} +void op_periods_boolfalse(const Option *o, const char *val) { + int *store= o->store; + *store= 0; +} + +static const Option options[]= { +{ 0, "max-connections", &max_connections op_integer }, +{ 0, "streaming", &try_stream, op_booltrue, 1 }, +{ 0, "no-streaming", &try_stream, op_boolfalse, 1 }, +{'h',"host", &remote_host, op_string }, +{'P',"port", &port op_integer }, +{ 0, "inndconf", &inndconffile, op_string }, +{'f',"feedfile", &feedfile, op_string }, +{'q',"quiet-multiple", &quiet_if_locked, op_booltrue, 1 }, +{ 0, "no-quiet-multiple", &quiet_if_locked, op_boolfalse, 1 }, +{'d',"daemon", &become_daemon, op_booltrue, 1 }, +{ 0, "no-daemon", &become_daemon, op_boolfalse, 1 }, + +{ 0, "no-check-proportion", &nocheck_thresh_pct, op_double }, +{ 0, "no-check-filter", &nocheck_decay_articles, op_double }, + +{ 0, "max-queue-size", &max_queue_per_conn op_integer }, +{ 0, "reconnect-interval", &reconnect_delay_periods, op_periods_rndup }, +{ 0, "flush-retry-interval", &flushfail_retry_periods, op_periods_rndup }, +{ 0, "feedfile-open-timeout", &open_wait_periods, op_periods_rndup }, +{ 0, "connection-timeout", &connection_timeout, op_seconds }, +{ 0, "inndcomm-timeout", &inndcomm_flush_timeout, op_seconds }, +}; + +int main(int argc, char **argv) { + const char *arg; + + for (;;) { + arg= *++argv; + if (!arg) break; + if (*arg != '-') break; + if (!strcmp(arg,"--")) { arg= *++argv; break; } + int a; + while ((a= *++arg)) { + const Option *o; + if (a=='-') { + arg++; + char *equals= strchr(arg,'='); + int len= equals ? (equals - arg) : strlen(arg); + for (o=options; o->long; o++) + if (strlen(o->long) == len && !memcmp(o->long,arg,len)) + goto found_long; + badusage("unknown long option --%s",arg); + found_long: + if (o->noarg) { + if (equals) badusage("option --%s does not take a value",o->long); + arg= 0; + } else if (equals) { + arg= equals+1; + } else { + arg= *++argv; + if (!arg) badusage("option --%s needs a value",o->long); + } + o->fn(o, arg); + break; /* eaten the whole argument now */ + } + for (o=options; o->long; o++) + if (a == o->short) + goto found_short; + badusage("unknown short option -%c",a); + found_short: + if (o->noarg) { + o->fn(o,0); + } else { + if (!*++arg) { + arg= *++argv; + if (!arg) badusage("option -%c needs a value",o->short); + } + o->fn(o,arg); + break; /* eaten the whole argument now */ + } + } + } + + if (!arg) badusage("need site name argument"); + if (*++argv) badusage("too many non-option arguments"); + sitename= arg; + + if (nocheck_thresh_pct < 0 || nocheck_thresh_pct > 100) + badusage("nocheck threshold percentage must be between 0..100"); + nocheck_thresh= nocheck_thresh_pct * 0.01; + + if (nocheck_decay_articles < 0.1) + badusage("nocheck decay articles must be at least 0.1"); + nocheck_decay= 1 - 1/nocheck_decay_articles; + + innconf_read(inndconffile); + + if (!feedfile) + feedfile= xasprintf("%s/%s",pathoutgoing,sitename); + else if (!feedfile[0]) + badusage("feed filename must be nonempty"); + else if (feedfile[strlen(feedfile)-1]=='/') + feedfile= xasprintf("%s%s",feedfile,sitename); + + const char *feedfile_forbidden= "?*[~#"; + int c; + while ((c= *feedfile_forbidden++)) + if (strchr(feedfile, c)) + badusage("feed filename may not contain metacharacter %c",c); + + if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) + sysdie("could not ignore SIGPIPE"); + + if (become_daemon) { + for (i=3; i<255; i++) + /* do this now before we open syslog, etc. */ + close(i); + openlog("innduct",LOG_NDELAY|LOG_PID,LOG_NEWS); + + int null= open("/dev/null",O_RDWR); + if (null<0) sysdie("failed to open /dev/null"); + dup2(null,0); + dup2(null,1); + dup2(null,2); + close(null); + + pid_t child1= xfork("daemonise first fork"); + if (child1) _exit(0); + + pid_t sid= setsid(); + if (sid != child1) sysdie("setsid failed"); + + pid_t child2= xfork("daemonise second fork"); + if (child2) _exit(0); + } + + notice("starting"); + + if (!filemon_init()) { + warn("no file monitoring available, polling"); + filepoll_schedule(); + } + + period_schedule(); + + statemc_init(); + + loop->execute. +}