#include "chiark_tcl_cdb.h"
+#define ftello ftell
+#define fseeko fseek
+
+/*---------- Forward declarations ----------*/
+
+struct ht_forall_ctx;
+
+/*---------- Useful routines ----------*/
+
+static void maybe_close(int fd) {
+ if (fd>=0) close(fd);
+}
+
+/*==================== Subsystems and subtypes ====================*/
+
/*---------- Pathbuf ----------*/
-typedef struct {
+typedef struct Pathbuf {
char *buf, *sfx;
} Pathbuf;
pb->buf= 0;
}
+/*---------- Our hash table ----------*/
+
+typedef struct HashTable {
+ Tcl_HashTable t;
+ Byte padding[128]; /* allow for expansion by Tcl, urgh */
+ Byte confound[16];
+} HashTable;
+
+typedef struct HashValue {
+ int len;
+ Byte data[1];
+} HashValue;
+
+static HashValue *htv_prep(int len) {
+ HashValue *hd;
+ hd= TALLOC((hd->data - (Byte*)hd) + len);
+ hd->len= len;
+ return hd;
+}
+static Byte *htv_fillptr(HashValue *hd) {
+ return hd->data;
+}
+
+static void ht_setup(HashTable *ht) {
+ Tcl_InitHashTable(&ht->t, TCL_STRING_KEYS);
+}
+static void ht_update(HashTable *ht, const char *key, HashValue *val_eat) {
+ Tcl_HashEntry *he;
+ int new;
+
+ he= Tcl_CreateHashEntry(&ht->t, (char*)key, &new);
+ if (!new) TFREE(Tcl_GetHashValue(he));
+ Tcl_SetHashValue(he, val_eat);
+ /* eats the value since the data structure owns the memory */
+}
+static void ht_maybeupdate(HashTable *ht, const char *key,
+ HashValue *val_eat) {
+ /* like ht_update except does not overwrite existing values */
+ Tcl_HashEntry *he;
+ int new;
+
+ he= Tcl_CreateHashEntry(&ht->t, (char*)key, &new);
+ if (!new) { TFREE(val_eat); return; }
+ Tcl_SetHashValue(he, val_eat);
+}
+
+static const HashValue *ht_lookup(HashTable *ht, const char *key) {
+ Tcl_HashEntry *he;
+
+ he= Tcl_FindHashEntry(&ht->t, key);
+ if (!he) return 0;
+
+ return Tcl_GetHashValue(he);
+}
+
+static int ht_forall(HashTable *ht,
+ int (*fn)(const char *key, HashValue *val,
+ struct ht_forall_ctx *ctx),
+ struct ht_forall_ctx *ctx) {
+ /* Returns first positive value returned by any call to fn, or 0. */
+ Tcl_HashSearch sp;
+ Tcl_HashEntry *he;
+ const char *key;
+ HashValue *val;
+ int r;
+
+ for (he= Tcl_FirstHashEntry(&ht->t, &sp);
+ he;
+ he= Tcl_NextHashEntry(&sp)) {
+ val= Tcl_GetHashValue(he);
+ if (!val->len) continue;
+
+ key= Tcl_GetHashKey(&ht->t, he);
+
+ r= fn(key, val, ctx);
+ if (r) return r;
+ }
+ return 0;
+}
+
+static void ht_destroy(HashTable *ht) {
+ Tcl_HashSearch sp;
+ Tcl_HashEntry *he;
+
+ for (he= Tcl_FirstHashEntry(&ht->t, &sp);
+ he;
+ he= Tcl_NextHashEntry(&sp)) {
+ /* ht_forall skips empty (deleted) entries so is no good for this */
+ TFREE(Tcl_GetHashValue(he));
+ }
+ Tcl_DeleteHashTable(&ht->t);
+}
+
+/*==================== Existential ====================*/
+
/*---------- Rw data structure ----------*/
-typedef struct {
- Pathbuf pbsome, pbtmp;
+typedef struct Rw {
+ int ix, autocompact;
+ int cdb_fd, lock_fd;
+ struct cdb cdb; /* valid iff cdb_fd >= 0 */
+ FILE *logfile;
+ HashTable logincore;
+ Pathbuf pbsome, pbother;
+ off_t mainsz;
+ ScriptToInvoke on_info, on_lexminval;
} Rw;
-static void destroy_cdbrw_idtabcb(Tcl_Interp *ip, void *val) { abort(); }
+static int rw_close(Tcl_Interp *ip, Rw *rw) {
+ int rc, r;
+ rc= TCL_OK;
+ ht_destroy(&rw->logincore);
+ if (rw->cdb_fd >= 0) cdb_free(&rw->cdb);
+ maybe_close(rw->cdb_fd);
+ maybe_close(rw->lock_fd);
+
+ if (rw->logfile) {
+ r= fclose(rw->logfile);
+ if (r && ip) { rc= cht_posixerr(ip, errno, "probable data loss! failed to"
+ " fclose logfile during untidy close"); }
+ }
+
+ pathbuf_free(&rw->pbsome); pathbuf_free(&rw->pbother);
+ TFREE(rw);
+ return rc;
+}
+
+static void destroy_cdbrw_idtabcb(Tcl_Interp *ip, void *rw) { rw_close(0,rw); }
const IdDataSpec cdbtcl_rwdatabases= {
"cdb-rwdb", "cdb-openrwdatabases-table", destroy_cdbrw_idtabcb
};
+/*---------- File handling ----------*/
+
+static int acquire_lock(Tcl_Interp *ip, Pathbuf *pb, int *lockfd_r) {
+ /* *lockfd_r must be -1 on entry. If may be set to >=0 even
+ * on error, and must be closed by the caller. */
+ mode_t um, lockmode;
+ struct flock fl;
+ int r;
+
+ um= umask(~(mode_t)0);
+ umask(um);
+
+ lockmode= 0666 & ~((um & 0444)>>1);
+ /* Remove r where umask would remove w;
+ * eg umask intending 0664 here gives 0660 */
+
+ *lockfd_r= open(pathbuf_sfx(pb,".lock"), O_RDONLY|O_CREAT, lockmode);
+ if (*lockfd_r < 0)
+ return cht_posixerr(ip, errno, "could not open/create lockfile");
+
+ fl.l_type= F_WRLCK;
+ fl.l_whence= SEEK_SET;
+ fl.l_start= 0;
+ fl.l_len= 0;
+ fl.l_pid= getpid();
+
+ r= fcntl(*lockfd_r, F_SETLK, &fl);
+ if (r == -1) {
+ if (errno == EACCES || errno == EAGAIN)
+ return cht_staticerr(ip, "lock held by another process", "CDB LOCKED");
+ else return cht_posixerr(ip, errno, "unexpected error from fcntl while"
+ " acquiring lock");
+ }
+
+ return TCL_OK;
+}
+
+/*---------- Log reading and writing ----------*/
+
+static int readlognum(FILE *f, int delim, int *num_r) {
+ int c;
+ char numbuf[20], *p, *ep;
+ unsigned long ul;
+
+ p= numbuf;
+ for (;;) {
+ c= getc(f); if (c==EOF) return -2;
+ if (c == delim) break;
+ if (!isdigit((unsigned char)c)) return -2;
+ *p++= c;
+ if (p == numbuf+sizeof(numbuf)) return -2;
+ }
+ if (p == numbuf) return -2;
+ *p= 0;
+
+ errno=0; ul= strtoul(numbuf, &ep, 10);
+ if (*ep || errno || ul >= INT_MAX/2) return -2;
+ *num_r= ul;
+ return 0;
+}
+
+static int readstorelogrecord(FILE *f, HashTable *ht,
+ int (*omitfn)(const HashValue*,
+ struct ht_forall_ctx *ctx),
+ struct ht_forall_ctx *ctx,
+ void (*updatefn)(HashTable*, const char*,
+ HashValue*)) {
+ /* returns:
+ * 0 for OK
+ * -1 eof
+ * -2 corrupt or error
+ * -3 got newline indicating end
+ * >0 value from omitfn
+ */
+ int keylen, vallen;
+ char *key;
+ HashValue *val;
+ int c, rc, r;
+ c= getc(f);
+ if (c==EOF) { if (feof(f)) return -1; return -2; }
+ if (c=='\n') return -3;
+ if (c!='+') return -2;
-/*---------- Misc functionality ----------*/
+ rc= readlognum(f, ',', &keylen); if (rc) return rc;
+ rc= readlognum(f, ':', &vallen); if (rc) return rc;
+
+ key= TALLOC(keylen+1);
+ val= htv_prep(vallen);
+
+ r= fread(key, 1,keylen, f);
+ if (r!=keylen) goto x2_free_keyval;
+ if (memchr(key,0,keylen)) goto x2_free_keyval;
+ key[keylen]= 0;
+
+ c= getc(f); if (c!='-') goto x2_free_keyval;
+ c= getc(f); if (c!='>') goto x2_free_keyval;
+
+ r= fread(htv_fillptr(val), 1,vallen, f);
+ if (r!=vallen) goto x2_free_keyval;
+
+ rc= omitfn ? omitfn(val, ctx) : TCL_OK;
+ if (rc) { assert(rc>0); TFREE(val); }
+ else updatefn(ht, key, val);
+
+ TFREE(key);
+ return rc;
+
+ x2_free_keyval:
+ TFREE(val);
+ TFREE(key);
+ return -2;
+}
+
+static int writerecord(FILE *f, const char *key, const HashValue *val) {
+ int r;
+
+ r= fprintf(f, "+%d,%d:%s->", strlen(key), val->len, key);
+ if (r<0) return -1;
+
+ r= fwrite(val->data, 1, val->len, f);
+ if (r != val->len) return -1;
+
+ return 0;
+}
+
+/*---------- Creating ----------*/
int cht_do_cdbwr_create_empty(ClientData cd, Tcl_Interp *ip,
const char *pathb) {
+ static const char *const toremoves[]= {
+ ".main", ".cdb", ".log", ".tmp", 0
+ };
+
Pathbuf pb;
- int lock_fd=-1, fd=-1;
+ int lock_fd=-1, fd=-1, rc, r;
+ const char *const *toremove;
pathbuf_init(&pb, pathb);
rc= acquire_lock(ip, &pb, &lock_fd); if (rc) goto x_rc;
- fd= open(pathbuf_sfx(".lock"), O_RDONLY
+ fd= open(pathbuf_sfx(&pb, ".main"), O_RDWR|O_CREAT|O_EXCL, 0666);
+ if (fd <= 0) PE("create new database file");
+
+ for (toremove=toremoves; *toremove; toremove++) {
+ r= remove(*toremove);
+ if (r && errno != ENOENT)
+ PE("delete possible spurious file during creation");
+ }
+
+ rc= TCL_OK;
+
+ x_rc:
+ maybe_close(fd);
+ maybe_close(lock_fd);
+ pathbuf_free(&pb);
+ return rc;
+}
+
+/*---------- Info callbacks ----------*/
+
+static int infocbv3(Tcl_Interp *ip, Rw *rw, const char *arg1,
+ const char *arg2fmt, const char *arg3, va_list al) {
+ Tcl_Obj *aa[3];
+ int na;
+ char buf[200];
+ vsnprintf(buf, sizeof(buf), arg2fmt, al);
+
+ na= 0;
+ aa[na++]= cht_ret_string(ip, arg1);
+ aa[na++]= cht_ret_string(ip, buf);
+ if (arg3) aa[na++]= cht_ret_string(ip, arg3);
+
+ return cht_scriptinv_invoke_fg(&rw->on_info, na, aa);
+}
+
+static int infocb3(Tcl_Interp *ip, Rw *rw, const char *arg1,
+ const char *arg2fmt, const char *arg3, ...) {
+ int rc;
+ va_list al;
+ va_start(al, arg3);
+ rc= infocbv3(ip,rw,arg1,arg2fmt,arg3,al);
+ va_end(al);
+ return rc;
+}
+
+static int infocb(Tcl_Interp *ip, Rw *rw, const char *arg1,
+ const char *arg2fmt, ...) {
+ int rc;
+ va_list al;
+ va_start(al, arg2fmt);
+ rc= infocbv3(ip,rw,arg1,arg2fmt,0,al);
+ va_end(al);
+ return rc;
+}
+
+/*---------- Opening ----------*/
+
+static int cdbinit(Tcl_Interp *ip, Rw *rw) {
+ /* On entry, cdb_fd >=0 but cdb is _undefined_/
+ * On exit, either cdb_fd<0 or cdb is initialised */
+ int r, rc;
+ r= cdb_init(&rw->cdb, rw->cdb_fd);
+ if (r) {
+ rc= cht_posixerr(ip, errno, "failed to initialise cdb reader");
+ close(rw->cdb_fd); rw->cdb_fd= -1; return rc;
+ }
+ return TCL_OK;
+}
+
+int cht_do_cdbwr_open(ClientData cd, Tcl_Interp *ip, const char *pathb,
+ Tcl_Obj *on_info, Tcl_Obj *on_lexminval,
+ void **result) {
+ const Cdbwr_SubCommand *subcmd= cd;
+ int r, rc, mainfd=-1;
+ Rw *rw;
+ struct stat stab;
+ off_t logrecstart, logjunkpos;
+
+ rw= TALLOC(sizeof(*rw));
+ ht_setup(&rw->logincore);
+ cht_scriptinv_init(&rw->on_info);
+ cht_scriptinv_init(&rw->on_lexminval);
+ rw->cdb_fd= rw->lock_fd= -1; rw->logfile= 0;
+ pathbuf_init(&rw->pbsome, pathb);
+ pathbuf_init(&rw->pbother, pathb);
+ rw->autocompact= 1;
+
+ if (on_lexminval) {
+ rc= cht_scriptinv_set(&rw->on_lexminval, ip, on_lexminval, 0);
+ if (rc) goto x_rc;
+ } else {
+ rw->on_lexminval.llength= 0;
+ }
+
+ mainfd= open(pathbuf_sfx(&rw->pbsome,".main"), O_RDONLY);
+ if (mainfd<0) PE("open existing database file .main");
+ rc= acquire_lock(ip, &rw->pbsome, &rw->lock_fd); if (rc) goto x_rc;
+
+ r= fstat(mainfd, &stab); if (r) PE("fstat .main");
+ rw->mainsz= stab.st_size;
+ rw->cdb_fd= open(pathbuf_sfx(&rw->pbsome,".cdb"), O_RDONLY);
+ if (rw->cdb_fd >=0) {
+ rc= cdbinit(ip, rw); if (rc) goto x_rc;
+ } else if (errno == ENOENT) {
+ if (rw->mainsz) {
+ rc= cht_staticerr(ip, ".cdb does not exist but .main is nonempty -"
+ " .cdb must have been accidentally deleted!",
+ "CDB CDBMISSING");
+ goto x_rc;
+ }
+ /* fine */
+ } else {
+ PE("open .cdb");
+ }
-int cht_do_cdbwr_open(ClientData cd, Tcl_Interp *ip, const char *pathb, Tcl_Obj *on_info, void **result);
+ rw->logfile= fopen(pathbuf_sfx(&rw->pbsome,".log"), "r+");
+ if (!rw->logfile) {
+ if (errno != ENOENT) PE("failed to open .log during open");
+ rw->logfile= fopen(rw->pbsome.buf, "w");
+ if (!rw->logfile) PE("create .log during (clean) open");
+ } else { /* rw->logfile */
+ r= fstat(fileno(rw->logfile), &stab);
+ if (r==-1) PE("fstat .log during open");
+ rc= infocb(ip, rw, "open-dirty-start", "log=%luby",
+ (unsigned long)stab.st_size);
+ if (rc) goto x_rc;
+ for (;;) {
+ logrecstart= ftello(rw->logfile);
+ if (logrecstart < 0) PE("ftello .log during (dirty) open");
+ r= readstorelogrecord(rw->logfile, &rw->logincore, 0,0, ht_update);
+ if (ferror(rw->logfile)) {
+ rc= cht_posixerr(ip, errno, "error reading .log during (dirty) open");
+ goto x_rc;
+ }
+ if (r==-1) {
+ break;
+ } else if (r==-2 || r==-3) {
+ char buf[100];
+ logjunkpos= ftello(rw->logfile);
+ if(logjunkpos<0) PE("ftello .log during report of junk in dirty open");
+
+ snprintf(buf,sizeof(buf), "CDB SYNTAX LOG %lu %lu",
+ (unsigned long)logjunkpos, (unsigned long)logrecstart);
+
+ if (!(subcmd->flags & RWSCF_OKJUNK)) {
+ Tcl_SetObjErrorCode(ip, Tcl_NewStringObj(buf,-1));
+ snprintf(buf,sizeof(buf),"%lu",(unsigned long)logjunkpos);
+ Tcl_ResetResult(ip);
+ Tcl_AppendResult(ip, "syntax error (junk) in .log during"
+ " (dirty) open, at file position ", buf, (char*)0);
+ rc= TCL_ERROR;
+ goto x_rc;
+ }
+ rc= infocb3(ip, rw, "open-dirty-junk", "errorfpos=%luby", buf,
+ (unsigned long)logjunkpos);
+ if (rc) goto x_rc;
+
+ r= fseeko(rw->logfile, logrecstart, SEEK_SET);
+ if (r) PE("failed to fseeko .log before junk during dirty open");
+
+ r= ftruncate(fileno(rw->logfile), logrecstart);
+ if (r) PE("ftruncate .log to chop junk during dirty open");
+ } else {
+ assert(!r);
+ }
+ }
+ }
+ /* now log is positioned for appending and everything is read */
+
+ *result= rw;
+ maybe_close(mainfd);
+ return TCL_OK;
+
+ x_rc:
+ rw_close(0,rw);
+ maybe_close(mainfd);
+ return rc;
+}
+
+int cht_do_cdbwr_open_okjunk(ClientData cd, Tcl_Interp *ip, const char *pathb,
+ Tcl_Obj *on_info, Tcl_Obj *on_lexminval,
+ void **result) {
+ return cht_do_cdbwr_open(cd,ip,pathb,on_info,on_lexminval,result);
+}
+
+/*==================== COMPACTION ====================*/
+
+struct ht_forall_ctx {
+ struct cdb_make cdbm;
+ FILE *mainfile;
+ int lexminvall;
+ long *reccount;
+ const char *lexminval;
+};
-int cht_do_cdbwr_close(ClientData cd, Tcl_Interp *ip, void *db);
-int cht_do_cdbwr_close_quick(ClientData cd, Tcl_Interp *ip, void *db);
-int cht_do_cdbwr_lookup(ClientData cd, Tcl_Interp *ip, void *db, Tcl_Obj *key, Tcl_Obj **result);
-int cht_do_cdbwr_lookup_hb(ClientData cd, Tcl_Interp *ip, void *db, HBytes_Value key, HBytes_Value *result);
-int cht_do_cdbwr_update(ClientData cd, Tcl_Interp *ip, void *db, Tcl_Obj *key, Tcl_Obj *value);
-int cht_do_cdbwr_update_hb(ClientData cd, Tcl_Interp *ip, void *db, HBytes_Value key, HBytes_Value value);
-int cht_do_cdbwr_update_quick(ClientData cd, Tcl_Interp *ip, void *db, Tcl_Obj *key, Tcl_Obj *value);
-int cht_do_cdbwr_update_quick_hb(ClientData cd, Tcl_Interp *ip, void *db, HBytes_Value key, HBytes_Value value);
+/*---------- helper functions ----------*/
+
+static int expiredp(const HashValue *val, struct ht_forall_ctx *a) {
+ int r, l;
+ if (!val->len) return 0;
+ l= val->len < a->lexminvall ? val->len : a->lexminvall;
+ r= memcmp(val->data, a->lexminval, l);
+ if (r>0) return 0;
+ if (r<0) return 1;
+ return val->len < a->lexminvall;
+}
+
+static int delete_ifexpired(const char *key, HashValue *val,
+ struct ht_forall_ctx *a) {
+ if (!expiredp(val, a)) return 0;
+ val->len= 0;
+ /* we don't actually need to realloc it to free the memory because
+ * this will shortly all be deleted as part of the compaction */
+ return 0;
+}
+
+static int addto_cdb(const char *key, HashValue *val,
+ struct ht_forall_ctx *a) {
+ return cdb_make_add(&a->cdbm, key, strlen(key), val->data, val->len);
+}
+
+static int addto_main(const char *key, HashValue *val,
+ struct ht_forall_ctx *a) {
+ (*a->reccount)++;
+ return writerecord(a->mainfile, key, val);
+}
+
+/*---------- compact main entrypoint ----------*/
+
+static int compact_core(Tcl_Interp *ip, Rw *rw, unsigned long logsz,
+ long *reccount_r) {
+ /* creates new .cdb and .main
+ * closes logfile
+ * leaves .log with old data
+ * leaves cdb fd open onto old db
+ * leaves logincore full of crap
+ */
+ int r, rc;
+ int cdbfd, cdbmaking;
+ off_t errpos, newmainsz;
+ char buf[100];
+ Tcl_Obj *res;
+ struct ht_forall_ctx a;
+
+ a.mainfile= 0;
+ cdbfd= -1;
+ cdbmaking= 0;
+ *reccount_r= 0;
+ a.reccount= reccount_r;
+
+ r= fclose(rw->logfile);
+ if (r) { rc= cht_posixerr(ip, errno, "probable data loss! failed to fclose"
+ " logfile during compact"); goto x_rc; }
+ rw->logfile= 0;
+
+ rc= infocb(ip, rw, "compact-start", "log=%luby main=%luby",
+ logsz, (unsigned long)rw->mainsz);
+ if (rc) goto x_rc;
+
+ if (rw->on_lexminval.llength) {
+ rc= cht_scriptinv_invoke_fg(&rw->on_lexminval, 0,0);
+ if (rc) goto x_rc;
+
+ res= Tcl_GetObjResult(ip); assert(res);
+ a.lexminval= Tcl_GetStringFromObj(res, &a.lexminvall);
+ assert(a.lexminval);
+
+ /* we rely not calling Tcl_Eval during the actual compaction;
+ * if we did Tcl_Eval then the interp result would be trashed.
+ */
+ rc= ht_forall(&rw->logincore, delete_ifexpired, &a);
+
+ } else {
+ a.lexminval= "";
+ }
+
+ /* merge unsuperseded records from main into hash table */
+
+ a.mainfile= fopen(pathbuf_sfx(&rw->pbsome,".main"), "r");
+ if (!a.mainfile) PE("failed to open .main for reading during compact");
+
+ for (;;) {
+ r= readstorelogrecord(a.mainfile, &rw->logincore,
+ expiredp, &a,
+ ht_maybeupdate);
+ if (ferror(a.mainfile)) { rc= cht_posixerr(ip, errno, "error reading"
+ " .main during compact"); goto x_rc;
+ }
+ if (r==-3) {
+ break;
+ } else if (r==-1 || r==-2) {
+ errpos= ftello(a.mainfile);
+ if (errpos<0) PE("ftello .main during report of syntax error");
+ snprintf(buf,sizeof(buf), "CDB SYNTAX MAIN %lu", (unsigned long)errpos);
+ Tcl_SetObjErrorCode(ip, Tcl_NewStringObj(buf,-1));
+ snprintf(buf,sizeof(buf), "%lu", (unsigned long)errpos);
+ Tcl_ResetResult(ip);
+ Tcl_AppendResult(ip, "syntax error in .main during"
+ " compact, at file position ", buf, (char*)0);
+ rc= TCL_ERROR;
+ goto x_rc;
+ } else {
+ assert(!rc);
+ }
+ }
+ fclose(a.mainfile);
+ a.mainfile= 0;
+
+ /* create new cdb */
+
+ cdbfd= open(pathbuf_sfx(&rw->pbsome,".tmp"), O_WRONLY|O_CREAT|O_TRUNC, 0666);
+ if (cdbfd<0) PE("create .tmp for new cdb during compact");
+
+ r= cdb_make_start(&a.cdbm, cdbfd);
+ if (r) PE("cdb_make_start during compact");
+ cdbmaking= 1;
+
+ r= ht_forall(&rw->logincore, addto_cdb, &a);
+ if (r) PE("cdb_make_add during compact");
+
+ r= cdb_make_finish(&a.cdbm);
+ if(r) PE("cdb_make_finish during compact");
+ cdbmaking= 0;
+
+ r= fdatasync(cdbfd); if (r) PE("fdatasync new cdb during compact");
+ r= close(cdbfd); if (r) PE("close new cdb during compact");
+ cdbfd= -1;
+
+ r= rename(rw->pbsome.buf, pathbuf_sfx(&rw->pbother,".cdb"));
+ if (r) PE("install new .cdb during compact");
+
+ /* create new main */
+
+ a.mainfile= fopen(pathbuf_sfx(&rw->pbsome,".tmp"), "w");
+ if (!a.mainfile) PE("create .tmp for new main during compact");
+
+ r= ht_forall(&rw->logincore, addto_main, &a);
+ if (r) { rc= cht_posixerr(ip, r, "error writing to new .main"
+ " during compact"); goto x_rc; }
+
+ r= fflush(a.mainfile); if (r) PE("fflush new main during compact");
+ r= fdatasync(fileno(a.mainfile));
+ if (r) PE("fdatasync new main during compact");
+
+ newmainsz= ftello(a.mainfile);
+ if (newmainsz<0) PE("ftello new main during compact");
+
+ r= fclose(a.mainfile); if (r) PE("fclose new main during compact");
+ a.mainfile= 0;
+
+ r= rename(rw->pbsome.buf, pathbuf_sfx(&rw->pbother,".main"));
+ if (r) PE("install new .main during compact");
+
+ rw->mainsz= newmainsz;
+
+ /* done! */
+
+ rc= infocb(ip, rw, "compact-end", "main=%luby nrecs=%l",
+ (unsigned long)rw->mainsz, *a.reccount);
+ if (rc) goto x_rc;
+
+ return rc;
+
+x_rc:
+ if (a.mainfile) fclose(a.mainfile);
+ if (cdbmaking) cdb_make_finish(&a.cdbm);
+ maybe_close(cdbfd);
+ remove(pathbuf_sfx(&rw->pbsome,".tmp")); /* for tidyness */
+ return rc;
+}
+
+/*---------- Closing ----------*/
+
+static int compact_forclose(Tcl_Interp *ip, Rw *rw, long *reccount_r) {
+ off_t logsz;
+ int r, rc;
+
+ logsz= ftello(rw->logfile);
+ if (logsz < 0) PE("ftello logfile (during tidy close)");
+
+ rc= compact_core(ip, rw, logsz, reccount_r); if (rc) goto x_rc;
+
+ r= remove(pathbuf_sfx(&rw->pbsome,".log"));
+ if (r) PE("remove .log (during tidy close)");
+
+ return TCL_OK;
+
+x_rc: return rc;
+}
+
+int cht_do_cdbwr_close(ClientData cd, Tcl_Interp *ip, void *rw_v) {
+ Rw *rw= rw_v;
+ int rc, rc_close;
+ long reccount= -1;
+ off_t logsz;
+
+ if (rw->autocompact) rc= compact_forclose(ip, rw, &reccount);
+ else rc= TCL_OK;
+
+ if (!rc) {
+ if (!rw->logfile) {
+ logsz= ftello(rw->logfile);
+ if (logsz < 0)
+ rc= cht_posixerr(ip, errno, "ftell logfile during close info");
+ else
+ rc= infocb(ip, rw, "close", "main=%luby log=%luby",
+ rw->mainsz, logsz);
+ } else if (reccount>=0) {
+ rc= infocb(ip, rw, "close", "main=%luby nrecs=%l", rw->mainsz, reccount);
+ } else {
+ rc= infocb(ip, rw, "close", "main=%luby", rw->mainsz);
+ }
+ }
+ rc_close= rw_close(ip,rw);
+ if (rc_close) rc= rc_close;
+
+ cht_tabledataid_disposing(ip, rw_v, &cdbtcl_rwdatabases);
+ return rc;
+}
+
+/*---------- Other compaction-related entrypoints ----------*/
+
+static int compact_keepopen(Tcl_Interp *ip, Rw *rw, int force) {
+ off_t logsz;
+ long reccount;
+ int rc, r;
+
+ logsz= ftello(rw->logfile);
+ if (logsz < 0) return cht_posixerr(ip, errno, "ftell .log"
+ " during compact check or force");
+
+ if (!force && logsz < rw->mainsz / 10 + 1000) return TCL_OK;
+
+ rc= compact_core(ip, rw, logsz, &reccount); if (rc) goto x_rc;
+
+ maybe_close(rw->cdb_fd);
+ rw->cdb_fd= -1;
+ ht_destroy(&rw->logincore);
+ ht_setup(&rw->logincore);
+
+ rw->cdb_fd= open(pathbuf_sfx(&rw->pbsome,".cdb"), O_RDONLY);
+ if (rw->cdb_fd < 0) PE("reopen .cdb after compact");
+
+ rc= cdbinit(ip, rw); if (rc) goto x_rc;
+
+ rw->logfile= fopen(pathbuf_sfx(&rw->pbsome,".log"), "w");
+ if (!rw->logfile) PE("reopen .log after compact");
+
+ r= fsync(fileno(rw->logfile)); if (r) PE("fsync .log after compact reopen");
+
+ return TCL_OK;
+
+x_rc:
+ /* doom! all updates fail after this (because rw->logfile is 0), and
+ * we may be using a lot more RAM than would be ideal. Program will
+ * have to reopen if it really wants sanity. */
+ return rc;
+}
+
+int cht_do_cdbwr_compact_force(ClientData cd, Tcl_Interp *ip, void *rw_v) {
+ return compact_keepopen(ip, rw_v, 1);
+}
+int cht_do_cdbwr_compact_check(ClientData cd, Tcl_Interp *ip, void *rw_v) {
+ return compact_keepopen(ip, rw_v, 0);
+}
+
+int cht_do_cdbwr_compact_explicit(ClientData cd, Tcl_Interp *ip, void *rw_v) {
+ Rw *rw= rw_v;
+ rw->autocompact= 0;
+ return TCL_OK;
+}
+int cht_do_cdbwr_compact_auto(ClientData cd, Tcl_Interp *ip, void *rw_v) {
+ Rw *rw= rw_v;
+ rw->autocompact= 1;
+ return TCL_OK;
+}
+
+/*---------- Updateing ----------*/
+
+static int update(Tcl_Interp *ip, Rw *rw, const char *key,
+ const Byte *data, int dlen) {
+ HashValue *val;
+ int rc, r;
+
+ if (!rw->logfile) return cht_staticerr
+ (ip, "previous compact failed; cdbwr must be closed and reopened "
+ "before any further updates", "CDB BROKEN");
+
+ val= htv_prep(dlen); assert(val);
+ memcpy(htv_fillptr(val), data, dlen);
+
+ r= writerecord(rw->logfile, key, val);
+ if (!r) r= fflush(rw->logfile);
+ if (r) PE("write update to logfile");
+
+ ht_update(&rw->logincore, key, val);
+ return compact_keepopen(ip, rw, 0);
+
+ x_rc:
+ TFREE(val);
+ return rc;
+}
+
+int cht_do_cdbwr_update(ClientData cd, Tcl_Interp *ip,
+ void *rw_v, const char *key, Tcl_Obj *value) {
+ int dlen;
+ const char *data;
+ data= Tcl_GetStringFromObj(value, &dlen); assert(data);
+ return update(ip, rw_v, key, data, dlen);
+}
+
+int cht_do_cdbwr_update_hb(ClientData cd, Tcl_Interp *ip,
+ void *rw_v, const char *key, HBytes_Value value) {
+ return update(ip, rw_v, key, cht_hb_data(&value), cht_hb_len(&value));
+}
+
+int cht_do_cdbwr_delete(ClientData cd, Tcl_Interp *ip, void *rw_v,
+ const char *key) {
+ return update(ip, rw_v, key, 0, 0);
+}
+
+/*---------- Lookups ----------*/
+
+static int lookup_rw(Tcl_Interp *ip, void *rw_v, const char *key,
+ const Byte **data_r, int *len_r /* -1 => notfound */) {
+ Rw *rw= rw_v;
+ const HashValue *val;
+
+ val= ht_lookup(&rw->logincore, key);
+ if (val) {
+ if (val->len) { *data_r= val->data; *len_r= val->len; return TCL_OK; }
+ else { *data_r= 0; *len_r= -1; return TCL_OK; }
+ }
+
+ return cht_cdb_lookup_cdb(ip, &rw->cdb, key, strlen(key), data_r, len_r);
+}
+
+int cht_do_cdbwr_lookup(ClientData cd, Tcl_Interp *ip, void *rw_v,
+ const char *key, Tcl_Obj *def,
+ Tcl_Obj **result) {
+ const Byte *data;
+ int dlen, r;
+
+ r= lookup_rw(ip, rw_v, key, &data, &dlen); if (r) return r;
+ return cht_cdb_donesomelookup(ip, rw_v, def, result, data, dlen,
+ cht_cdb_storeanswer_string);
+}
+
+int cht_do_cdbwr_lookup_hb(ClientData cd, Tcl_Interp *ip, void *rw_v,
+ const char *key, Tcl_Obj *def,
+ Tcl_Obj **result) {
+ const Byte *data;
+ int dlen, r;
+
+ r= lookup_rw(ip, rw_v, key, &data, &dlen); if (r) return r;
+ return cht_cdb_donesomelookup(ip, rw_v, def, result, data, dlen,
+ cht_cdb_storeanswer_hb);
+}
~ian / chiark-tcl.git / blobdiff