* Four files full of
* token article
*
- * 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_<inum> 431'd articles, ready for innxmit
- * site.name_deferlock lock taken out by innxmit wrapper
- *
- *
- *
- * OVERALL STATES:
+ * site.name_duct.lock lock preventing multiple ducts
+ * holder of this lock is "duct"
+ * 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
+ * D site.name_duct temporary feed file during flush (or crash)
+ * hardlink created by duct
+ * unlinked by duct
+ * site.name_duct.defer 431'd articles, still being written,
+ * created, written, used by duct
+ * site.name_backlog.lock lock taken out by innxmit wrapper
+ * holder and its child are "xmit"
+ * site.name_backlog_<inum> 431'd articles, ready for innxmit
+ * created (link/mv) by duct
+ * read by xmit
+ * unlinked by xmit
+ * site.name_backlog_<letters> 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
+ * read by xmit
+ * unlinked by xmit
+
+
+ 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
- * | |
- * `--<--'
*
*/
+#define PERIOD_SECONDS 60
+
+static char *feedfile;
static int max_connections, max_queue_per_conn;
static int connection_setup_timeout, port, try_stream;
static const char *remote_host;
struct Article {
char *mid;
int midlen;
- int nocheck; /* also used when CHECK says yes please */
+ int checked, sentbody;
+ fd and offset for blanking token or mid;
};
-#define CONNBUFSZ 16384
+#define CONNIOVS 128
#define CN "<%d> "
typedef struct Conn Conn;
+
+typedef enum {
+ Malloc, Const, Artdata;
+} XmitKind;
+
+typedef struct {
+ XmitKind kind;
+ union {
+ char *malloc_tofree;
+ ARTHANDLE *sm_art;
+ } info;
+} XmitDetails;
+
struct Conn {
ISNODE(Conn);
int fd, max_queue, stream;
- LIST(Article) queue;
- Article *tosend; /* points into queue */
- char circ_buf[CONNBUFSZ];
- unsigned circ_read, circ_write;
+ 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;
};
+static int filemon_init(void);
+static void filemon_setfile(int mainfeed_fd, const char *mainfeed_path);
+static void filemon_callback(void);
+
#define CHILD_ESTATUS_STREAM 4
#define CHILD_ESTATUS_NOSTREAM 5
static void perhaps_close(int *fd) { if (*fd) { close(*fd); fd=0; } }
-
/*========== making new connections ==========*/
static int connecting_sockets[2]= {-1,-1};
Conn *conn= 0;
conn= xcalloc(sizeof(*conn));
-
+
DECL_MSG_CMSG(msg);
struct cmsghdr *h= 0;
ssize_t rs= recvmsg(fd, &msg, MSG_DONTWAIT);
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:
}
/*========== overall control of article flow ==========*/
-
-static void process_queue() {
+
+static void conn_check_work(Conn *conn);
+
+static void check_master_queue(void) {
+ try reading current feed file;
+
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 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_writeable() {
+static void conn_check_work(Conn *conn) {
+ void *rp= 0;
for (;;) {
- int circ_used= circ_write - circ_read;
- if (circ_used < 0) circ_used += CONNBUFSZ;
- writeable_moredata(conn, CONNBUFSZ-1 - circ_used);
-
- if (conn->circ_read == conn->circ_write)
- return OOP_CONTINUE;
-
- 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;
+ conn_make_some_xmits(conn);
+ if (!conn->xmitu) {
+ 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 {
- iov[0].iov_len= conn->circ_write - conn->circ_read;
+ abort();
}
- ssize_t rs= writev(conn->fd, &iov, niov);
+ }
+}
+
+/*========== article transmission ==========*/
+
+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) return OOP_CONTINUE;
syswarn(CN "write failed", conn->fd);
conn_failed(conn);
- return OOP_CONTINUE;
+ return OOP_HALT;
}
assert(rs > 0);
- conn->circ_read += rs;
- if (conn->circ_read > CONNBUFSZ)
- conn->circ_read -= CONNBUFSZ;
+ for (done=0; rs && done<xmitu; done++) {
+ struct iovec *vp= &conn->xmit[done];
+ XmitDetails *dp= &conn->xmitd[done];
+ if (rs > vp->iov_len) {
+ rs -= vp->iov_len;
+ xmit_free(dp);
+ } else {
+ vp->iov_base += rs;
+ vp->iov_len -= rs;
+ }
+ }
+ int newu= conn->xmitu - done;
+ memmove(conn->xmit, conn->xmit + done, newu * sizeof(*conn->xmit));
+ memmove(conn->xmitd, conn->xmitd + done, newu * sizeof(*conn->xmitd));
+ conn->xmitu= newu;
+ }
+}
+
+static void conn_make_some_xmits(Conn *conn) {
+ for (;;) {
+ if (conn->xmitu+5 > CONNIOVS)
+ break;
+
+ Article *art= LIST_REMHEAD(queue);
+ if (!art) break;
+
+ if (art->checked || conn->nocheck) {
+ /* actually send it */
+
+ ARTHANDLE *artdata= SMretrieve(somehow);
+
+ if (conn->stream) {
+ if (artdata) {
+ XMIT_LITERAL("TAKETHIS ");
+ xmit_noalloc(art->mid, art->midlen);
+ XMIT_LITERAL("\r\n");
+ xmit_artbody(artdata);
+ }
+ } else {
+ /* we got 235 from IHAVE */
+ if (artdata) {
+ xmit_artbody(artdata);
+ } else {
+ XMIT_LITERAL(".\r\n");
+ }
+ }
+ art->sent= 1;
+ LIST_ADDTAIL(conn->sent, art);
+
+ } else {
+ /* 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);
+ }
+ }
+}
+
+/*========== 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_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) {
+ warn("unexpected EOF from peer");
+ conn_failed(conn);
+ return;
+ }
+ 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;
+ }
+ warn("badly formatted response from peer: %s", sanibuf);
+ conn_failed(conn);
+ return;
+ }
+
+ if (conn->quitting) {
+ if (code!=205) {
+ warn("peer gave failure response to QUIT: %s", sani);
+ conn_failed(conn);
+ return;
+ }
+ conn close ok;
+ return;
+ }
+
+ switch (code) {
+ case 438: /* CHECK says they have it */
+ case 435: /* IHAVE says they have it */
+ ARTICLE_DEALTWITH(1,unwanted);
+ break;
+
+ case 238: /* CHECK says send it */
+ case 335: /* IHAVE says send it */
+ count_checkedwanted++;
+ Article *art= LIST_REMHEAD(conn->sent);
+ art->checked= 1;
+ LIST_ADDTAIL(conn->queue);
+ break;
+
+ case 235: /* IHAVE says thanks */
+ case 239: /* TAKETHIS says thanks */
+ ARTICLE_DEALTWITH(1,accepted);
+ break;
+
+ case 439: /* TAKETHIS says rejected */
+ case 437: /* IHAVE says rejected */
+ ARTICLE_DEALTWITH(1,rejected);
+ break;
+
+ case 431: /* CHECK or TAKETHIS says try later */
+ case 436: /* IHAVE says try later */
+ ARTICLE_DEALTWITH(0,deferred);
+ break;
+
+ case 400: warn("peer has stopped accepting articles: %s", sani); goto failed;
+ case 503: warn("peer timed us out: %s", sani); goto failed;
+ default: warn("peer sent unexpected message: %s", sani);
+ failed:
+ conn_failed(conn);
+ return OOP_CONTINUE;;
+ }
+
+ return OOP_CONTINUE;
+}
+
+/*========== monitoring of input file ==========*/
+
+/*---------- 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);
+}
+
+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 && ipf==main_input_file) { errno=EAGAIN; return -1; }
+ if (r==-1 && errno==EINTR) continue;
+ return r;
+ }
+}
+
+/*---------- filemon implemented with inotify ----------*/
+
+#if defined(HAVE_INOTIFY) && !defined(HAVE_FILEMON)
+#define HAVE_FILEMON
+
+#include <linux/inotify.h>
+
+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;
+
+ pf->wd= wd;
+}
+
+static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) {
+ int wd= pf->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];
+ 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);
+ 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 transmit(Conn *conn) {
- assert(conn->queue.count < max_queue);
-
+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_delete(ipf->rd);
+ ipf->rd= 0;
+ assert(!ipf->filemon); /* we shouldn't be monitoring it now */
+}
+
+/*========== interaction with innd ==========*/
+
+/* See official state diagram at top of file. We implement
+ * this as follows:
+ *
+ ================
+ WAITING
+ [Nothing/Noduct]
+ poll for F
+ ================
+ |
+ | TIMEOUT
+ |`--------------------------.
+ | | install defer as backlog
+ ,--------->| | exit
+ | | OPEN F SUCCEEDS V
+ | V =========
+ | ======== (ESRCH)
+ | NORMAL [Dropped]
+ | [Normal] =========
+ | read F
+ | ========
+ | |
+ | | 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] |
+ | read D |
+ | ========== |
+ | | |
+ | | INNDCOMM FLUSH FAILS ^
+ | |`----------------------->--------. |
+ | | | |
+ | | NO SUCH SITE V |
+ ^ |`----------------. ========= |
+ | | | FLUSHFAIL |
+ | | V [Moved] |
+ | | ========== read D |
+ | | DROPPING ========= |
+ | | [Dropping] | |
+ | | read D | TIME TO RETRY |
+ | | ========== `------------------'
+ | | FLUSH OK |
+ | | open F | AT EOF OF D AND ALL PROCESSED
+ | V | install defer as backlog
+ | =========== | unlink D
+ | SEPARATED | exit
+ | [Separated] V
+ | read D ==========
+ | =========== (ESRCH)
+ | | [Droppped]
+ | | ==========
+ | V
+ | | AT EOF OF D
+ ^ |
+ | ===========
+ | FINISHING
+ | [Finishing]
+ | read F
+ | write D
+ | ===========
+ | |
+ | | ALL D PROCESSED
+ | | install defer as backlog
+ | | start new defer
+ ^ V unlink D
+ | | close D
+ | |
+ `----------'
+
+ *
+ */
+
+static char *path_ductlock, *path_duct, *path_ductdefer;
+
+typedef struct {
+ /* This is an instance of struct oop_readable */
+ struct oop_readable readable; /* first */
+ oop_readable_call *readable_callback;
+ void *readable_callback_user;
+
+ int fd;
+ const char *path; /* ptr copy of path_<foo> or feedfile */
+ struct Filemon_Perfile *filemon;
+
+ oop_read *rd;
+ long inprogress; /* no. of articles read but not processed */
+} InputFile;
+
+static void statemc_init(void) {
+ path_ductlock= xasprintf("%s_duct.lock", feedfile);
+ path_duct= xasprintf("%s_duct", feedfile);
+ path_ductdefer= xasprintf("%s_duct.defer", feedfile);
+
+ int lockfd= open(path_ductlock, O_CREAT|O_RDWR, 0600);
+ if (lockfd<0) sysdie("open lockfile %s", path_ductlock);
+
+ 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)
+ die("another duct holds the lockfile");
+ sysdie("fcntl F_SETLK lockfile %s", path_ductlock);
+ }
+}
+
+static void statemc_poll(void) {
+ if (tailing_fd>=0) return;
+
+ int d_fd= open(path_duct, O_RDWR);
+ if (d_fd<0)
+ if (errno!=ENOENT) sysdie("open duct file %s", path_duct);
+
+ int f_fd= open(feedfile, O_RDWR);
+ if (f_fd<0)
+ if (errno!=ENOENT) sysdie("open feed file %s", feedfile);
+
+ if (d_fd<0) {
+ if (f_fd>=0)
+ start_tailing(f_fd);
+ return;
+ }
+
+
+
+/*========== main program ==========*/
+
+#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}, { check_master_queue(); })
+
+EVERY(period, {PERIOD_SECONDS,0}, {
+ if (connect_delay) connect_delay--;
+ statemc_poll();
+ check_master_queue();
+});
main {
ignore sigpipe;
+ if (!filemon_init())
+ filepoll_schedule();
+ period_schedule();
};
~ian / innduct.git / blobdiff