2 * cdb, cdb-wr - Tcl bindings for tinycdb and a journalling write extension
3 * Copyright 2006 Ian Jackson
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 #include "chiark_tcl_cdb.h"
23 #define KEYLEN_MAX (INT_MAX/2)
28 /*---------- Forward declarations ----------*/
32 /*---------- Useful routines ----------*/
34 static void maybe_close(int fd) {
38 /*==================== Subsystems and subtypes ====================*/
40 /*---------- Pathbuf ----------*/
42 typedef struct Pathbuf {
48 static void pathbuf_init(Pathbuf *pb, const char *pathb) {
49 size_t l= strlen(pathb);
51 pb->buf= TALLOC(l + MAX_SUFFIX + 1);
52 memcpy(pb->buf, pathb, l);
55 static const char *pathbuf_sfx(Pathbuf *pb, const char *suffix) {
56 assert(strlen(suffix) <= MAX_SUFFIX);
57 strcpy(pb->sfx, suffix);
60 static void pathbuf_free(Pathbuf *pb) {
65 /*---------- Our hash table ----------*/
67 typedef struct HashTable {
69 Byte padding[128]; /* allow for expansion by Tcl, urgh */
73 typedef struct HashValue {
78 static HashValue *htv_prep(int len) {
80 hd= TALLOC((hd->data - (Byte*)hd) + len);
84 static Byte *htv_fillptr(HashValue *hd) {
88 static void ht_setup(HashTable *ht) {
89 Tcl_InitHashTable(&ht->t, TCL_STRING_KEYS);
91 static void ht_update(HashTable *ht, const char *key, HashValue *val_eat) {
95 he= Tcl_CreateHashEntry(&ht->t, (char*)key, &new);
96 if (!new) TFREE(Tcl_GetHashValue(he));
97 Tcl_SetHashValue(he, val_eat);
98 /* eats the value since the data structure owns the memory */
100 static void ht_maybeupdate(HashTable *ht, const char *key,
101 HashValue *val_eat) {
102 /* like ht_update except does not overwrite existing values */
106 he= Tcl_CreateHashEntry(&ht->t, (char*)key, &new);
107 if (!new) { TFREE(val_eat); return; }
108 Tcl_SetHashValue(he, val_eat);
111 static const HashValue *ht_lookup(HashTable *ht, const char *key) {
114 he= Tcl_FindHashEntry(&ht->t, key);
117 return Tcl_GetHashValue(he);
120 static int ht_forall(HashTable *ht,
121 int (*fn)(const char *key, HashValue *val,
122 struct ht_forall_ctx *ctx),
123 struct ht_forall_ctx *ctx) {
124 /* Returns first positive value returned by any call to fn, or 0. */
131 for (he= Tcl_FirstHashEntry(&ht->t, &sp);
133 he= Tcl_NextHashEntry(&sp)) {
134 val= Tcl_GetHashValue(he);
135 if (!val->len) continue;
137 key= Tcl_GetHashKey(&ht->t, he);
139 r= fn(key, val, ctx);
145 static void ht_destroy(HashTable *ht) {
149 for (he= Tcl_FirstHashEntry(&ht->t, &sp);
151 he= Tcl_NextHashEntry(&sp)) {
152 /* ht_forall skips empty (deleted) entries so is no good for this */
153 TFREE(Tcl_GetHashValue(he));
155 Tcl_DeleteHashTable(&ht->t);
158 /*==================== Existential ====================*/
160 /*---------- Rw data structure ----------*/
165 struct cdb cdb; /* valid iff cdb_fd >= 0 */
166 FILE *logfile; /* may be 0; if so, is broken */
168 Pathbuf pbsome, pbother;
170 ScriptToInvoke on_info, on_lexminval;
173 static void rw_cdb_close(Tcl_Interp *ip, Rw *rw) {
174 if (rw->cdb_fd >= 0) cdb_free(&rw->cdb);
175 maybe_close(rw->cdb_fd);
178 static int rw_close(Tcl_Interp *ip, Rw *rw) {
182 ht_destroy(&rw->logincore);
184 maybe_close(rw->lock_fd);
187 r= fclose(rw->logfile);
188 if (r && ip) { rc= cht_posixerr(ip, errno, "probable data loss! failed to"
189 " fclose logfile during untidy close"); }
192 pathbuf_free(&rw->pbsome); pathbuf_free(&rw->pbother);
196 static void destroy_cdbrw_idtabcb(Tcl_Interp *ip, void *rw_v) {
200 const IdDataSpec cdbtcl_rwdatabases= {
201 "cdb-rwdb", "cdb-openrwdatabases-table", destroy_cdbrw_idtabcb
204 /*---------- File handling ----------*/
206 static int acquire_lock(Tcl_Interp *ip, Pathbuf *pb, int *lockfd_r) {
207 /* *lockfd_r must be -1 on entry. If may be set to >=0 even
208 * on error, and must be closed by the caller. */
213 um= umask(~(mode_t)0);
216 lockmode= 0666 & ~((um & 0444)>>1);
217 /* Remove r where umask would remove w;
218 * eg umask intending 0664 here gives 0660 */
220 *lockfd_r= open(pathbuf_sfx(pb,".lock"), O_RDWR|O_CREAT, lockmode);
222 return cht_posixerr(ip, errno, "could not open/create lockfile");
225 fl.l_whence= SEEK_SET;
230 r= fcntl(*lockfd_r, F_SETLK, &fl);
232 if (errno == EACCES || errno == EAGAIN)
233 return cht_staticerr(ip, "lock held by another process", "CDB LOCKED");
234 else return cht_posixerr(ip, errno, "unexpected error from fcntl while"
241 /*---------- Log reading and writing ----------*/
243 static int readlognum(FILE *f, int delim, int *num_r) {
245 char numbuf[20], *p, *ep;
250 c= getc(f); if (c==EOF) return -2;
251 if (c == delim) break;
252 if (!isdigit((unsigned char)c)) return -2;
254 if (p == numbuf+sizeof(numbuf)) return -2;
256 if (p == numbuf) return -2;
259 errno=0; ul= strtoul(numbuf, &ep, 10);
260 if (*ep || errno || ul >= KEYLEN_MAX) return -2;
265 static int readstorelogrecord(FILE *f, HashTable *ht,
266 int (*omitfn)(const HashValue*,
267 struct ht_forall_ctx *ctx),
268 struct ht_forall_ctx *ctx,
269 void (*updatefn)(HashTable*, const char*,
274 * -2 corrupt or error
275 * -3 got newline indicating end
276 * >0 value from omitfn
284 if (c==EOF) { return feof(f) ? -1 : -2; }
285 if (c=='\n') return -3;
286 if (c!='+') return -2;
288 rc= readlognum(f, ',', &keylen); if (rc) return rc;
289 rc= readlognum(f, ':', &vallen); if (rc) return rc;
291 key= TALLOC(keylen+1);
292 val= htv_prep(vallen);
294 r= fread(key, 1,keylen, f);
295 if (r!=keylen) goto x2_free_keyval;
296 if (memchr(key,0,keylen)) goto x2_free_keyval;
299 c= getc(f); if (c!='-') goto x2_free_keyval;
300 c= getc(f); if (c!='>') goto x2_free_keyval;
302 r= fread(htv_fillptr(val), 1,vallen, f);
303 if (r!=vallen) goto x2_free_keyval;
305 c= getc(f); if (c!='\n') goto x2_free_keyval;
307 rc= omitfn ? omitfn(val, ctx) : TCL_OK;
308 if (rc) { assert(rc>0); TFREE(val); }
309 else updatefn(ht, key, val);
320 static int writerecord(FILE *f, const char *key, const HashValue *val) {
323 r= fprintf(f, "+%d,%d:%s->", (int)strlen(key), val->len, key);
326 r= fwrite(val->data, 1, val->len, f);
327 if (r != val->len) return -1;
330 if (r==EOF) return -1;
335 /*---------- Creating ----------*/
337 int cht_do_cdbwr_create_empty(ClientData cd, Tcl_Interp *ip,
339 static const char *const toremoves[]= { ".cdb", ".jrn", ".tmp", 0 };
342 int lock_fd=-1, rc, r;
344 const char *const *toremove;
347 pathbuf_init(&pb, pathb);
348 pathbuf_init(&pbmain, pathb);
350 rc= acquire_lock(ip, &pb, &lock_fd); if (rc) goto x_rc;
352 r= lstat(pathbuf_sfx(&pbmain, ".main"), &stab);
353 if (!r) { rc= cht_staticerr(ip, "database already exists during creation",
354 "CDB ALREADY-EXISTS"); goto x_rc; }
355 if (errno != ENOENT) PE("check for existing database .main during creation");
357 for (toremove=toremoves; *toremove; toremove++) {
358 r= remove(pathbuf_sfx(&pb, *toremove));
359 if (r && errno != ENOENT)
360 PE("delete possible spurious file during creation");
363 f= fopen(pathbuf_sfx(&pb, ".tmp"), "w");
364 if (!f) PE("create new database .tmp");
365 r= putc('\n', f); if (r==EOF) PE("write sentinel to new database .tmp");
366 r= fclose(f); f=0; if (r) PE("close new database .tmp during creation");
368 r= rename(pb.buf, pbmain.buf);
369 if (r) PE("install new database .tmp as .main (finalising creation)");
375 maybe_close(lock_fd);
377 pathbuf_free(&pbmain);
381 /*---------- Info callbacks ----------*/
383 static int infocbv3(Tcl_Interp *ip, Rw *rw, const char *arg1,
384 const char *arg2fmt, const char *arg3, va_list al) {
388 vsnprintf(buf, sizeof(buf), arg2fmt, al);
391 aa[na++]= cht_ret_string(ip, arg1);
392 aa[na++]= cht_ret_string(ip, buf);
393 if (arg3) aa[na++]= cht_ret_string(ip, arg3);
395 return cht_scriptinv_invoke_fg(&rw->on_info, na, aa);
398 static int infocb3(Tcl_Interp *ip, Rw *rw, const char *arg1,
399 const char *arg2fmt, const char *arg3, ...) {
403 rc= infocbv3(ip,rw,arg1,arg2fmt,arg3,al);
408 static int infocb(Tcl_Interp *ip, Rw *rw, const char *arg1,
409 const char *arg2fmt, ...) {
412 va_start(al, arg2fmt);
413 rc= infocbv3(ip,rw,arg1,arg2fmt,0,al);
418 /*---------- Opening ----------*/
420 static int cdbinit(Tcl_Interp *ip, Rw *rw) {
421 /* On entry, cdb_fd >=0 but cdb is _undefined_
422 * On exit, either cdb_fd<0 or cdb is initialised */
425 r= cdb_init(&rw->cdb, rw->cdb_fd);
427 rc= cht_posixerr(ip, errno, "failed to initialise cdb reader");
428 close(rw->cdb_fd); rw->cdb_fd= -1; return rc;
433 int cht_do_cdbwr_open(ClientData cd, Tcl_Interp *ip, const char *pathb,
434 Tcl_Obj *on_info, Tcl_Obj *on_lexminval,
436 const Cdbwr_SubCommand *subcmd= cd;
437 int r, rc, mainfd=-1;
440 off_t logrecstart, logjunkpos;
442 rw= TALLOC(sizeof(*rw));
444 ht_setup(&rw->logincore);
445 cht_scriptinv_init(&rw->on_info);
446 cht_scriptinv_init(&rw->on_lexminval);
447 rw->cdb_fd= rw->lock_fd= -1; rw->logfile= 0;
448 pathbuf_init(&rw->pbsome, pathb);
449 pathbuf_init(&rw->pbother, pathb);
452 rc= cht_scriptinv_set(&rw->on_info, ip, on_info, 0);
455 rc= cht_scriptinv_set(&rw->on_lexminval, ip, on_lexminval, 0);
458 mainfd= open(pathbuf_sfx(&rw->pbsome,".main"), O_RDONLY);
459 if (mainfd<0) PE("open existing database file .main");
460 rc= acquire_lock(ip, &rw->pbsome, &rw->lock_fd); if (rc) goto x_rc;
462 r= fstat(mainfd, &stab); if (r) PE("fstat .main");
463 rw->mainsz= stab.st_size;
465 rw->cdb_fd= open(pathbuf_sfx(&rw->pbsome,".cdb"), O_RDONLY);
466 if (rw->cdb_fd >=0) {
467 rc= cdbinit(ip, rw); if (rc) goto x_rc;
468 } else if (errno == ENOENT) {
469 if (rw->mainsz > 1) {
470 rc= cht_staticerr(ip, ".cdb does not exist but .main is >1byte -"
471 " .cdb must have been accidentally deleted!",
480 rw->logfile= fopen(pathbuf_sfx(&rw->pbsome,".jrn"), "r+");
482 if (errno != ENOENT) PE("failed to open .jrn during open");
483 rw->logfile= fopen(rw->pbsome.buf, "w");
484 if (!rw->logfile) PE("create .jrn during (clean) open");
485 } else { /* rw->logfile */
486 r= fstat(fileno(rw->logfile), &stab);
487 if (r==-1) PE("fstat .jrn during open");
488 rc= infocb(ip, rw, "open-dirty-start", "log=%luby",
489 (unsigned long)stab.st_size);
493 logrecstart= ftello(rw->logfile);
494 if (logrecstart < 0) PE("ftello .jrn during (dirty) open");
495 r= readstorelogrecord(rw->logfile, &rw->logincore, 0,0, ht_update);
496 if (ferror(rw->logfile)) {
497 rc= cht_posixerr(ip, errno, "error reading .jrn during (dirty) open");
502 } else if (r==-2 || r==-3) {
504 logjunkpos= ftello(rw->logfile);
505 if(logjunkpos<0) PE("ftello .jrn during report of junk in dirty open");
507 snprintf(buf,sizeof(buf), "CDB SYNTAX LOG %lu %lu",
508 (unsigned long)logjunkpos, (unsigned long)logrecstart);
510 if (!(subcmd->flags & RWSCF_OKJUNK)) {
511 Tcl_SetObjErrorCode(ip, Tcl_NewStringObj(buf,-1));
512 snprintf(buf,sizeof(buf),"%lu",(unsigned long)logjunkpos);
514 Tcl_AppendResult(ip, "syntax error (junk) in .jrn during"
515 " (dirty) open, at file position ", buf, (char*)0);
519 rc= infocb3(ip, rw, "open-dirty-junk", "errorfpos=%luby", buf,
520 (unsigned long)logjunkpos);
523 r= fseeko(rw->logfile, logrecstart, SEEK_SET);
524 if (r) PE("failed to fseeko .jrn before junk during dirty open");
526 r= ftruncate(fileno(rw->logfile), logrecstart);
527 if (r) PE("ftruncate .jrn to chop junk during dirty open");
533 /* now log is positioned for appending and everything is read */
546 int cht_do_cdbwr_open_okjunk(ClientData cd, Tcl_Interp *ip, const char *pathb,
547 Tcl_Obj *on_info, Tcl_Obj *on_lexminval,
549 return cht_do_cdbwr_open(cd,ip,pathb,on_info,on_lexminval,result);
552 /*==================== COMPACTION ====================*/
554 struct ht_forall_ctx {
555 struct cdb_make cdbm;
559 const char *lexminval; /* may be invalid if lexminvall <= 0 */
562 /*---------- helper functions ----------*/
564 static int expiredp(const HashValue *val, struct ht_forall_ctx *a) {
566 if (!val->len || a->lexminvall<=0) return 0;
567 l= val->len < a->lexminvall ? val->len : a->lexminvall;
568 r= memcmp(val->data, a->lexminval, l);
571 return val->len < a->lexminvall;
574 static int delete_ifexpired(const char *key, HashValue *val,
575 struct ht_forall_ctx *a) {
576 if (!expiredp(val, a)) return 0;
578 /* we don't actually need to realloc it to free the memory because
579 * this will shortly all be deleted as part of the compaction */
583 static int addto_cdb(const char *key, HashValue *val,
584 struct ht_forall_ctx *a) {
585 return cdb_make_add(&a->cdbm, key, strlen(key), val->data, val->len);
588 static int addto_main(const char *key, HashValue *val,
589 struct ht_forall_ctx *a) {
591 return writerecord(a->mainfile, key, val);
594 /*---------- compact main entrypoint ----------*/
596 static int compact_core(Tcl_Interp *ip, Rw *rw, unsigned long logsz,
598 /* creates new .cdb and .main
600 * leaves .jrn with old data
601 * leaves cdb fd open onto old db
602 * leaves logincore full of crap
605 int cdbfd, cdbmaking;
606 off_t errpos, newmainsz;
609 struct ht_forall_ctx a;
615 a.reccount= reccount_r;
617 r= fclose(rw->logfile);
619 if (r) { rc= cht_posixerr(ip, errno, "probable data loss! failed to fclose"
620 " logfile during compact"); goto x_rc; }
622 rc= infocb(ip, rw, "compact-start", "log=%luby main=%luby",
623 logsz, (unsigned long)rw->mainsz);
626 if (cht_scriptinv_interp(&rw->on_lexminval)) {
627 rc= cht_scriptinv_invoke_fg(&rw->on_lexminval, 0,0);
630 res= Tcl_GetObjResult(ip); assert(res);
631 a.lexminval= Tcl_GetStringFromObj(res, &a.lexminvall);
634 /* we rely not calling Tcl_Eval during the actual compaction;
635 * if we did Tcl_Eval then the interp result would be trashed.
637 rc= ht_forall(&rw->logincore, delete_ifexpired, &a);
643 /* merge unsuperseded records from main into hash table */
645 a.mainfile= fopen(pathbuf_sfx(&rw->pbsome,".main"), "r");
646 if (!a.mainfile) PE("failed to open .main for reading during compact");
649 r= readstorelogrecord(a.mainfile, &rw->logincore,
652 if (ferror(a.mainfile)) { rc= cht_posixerr(ip, errno, "error reading"
653 " .main during compact"); goto x_rc; }
656 } else if (r==-1 || r==-2) {
657 errpos= ftello(a.mainfile);
658 if (errpos<0) PE("ftello .main during report of syntax error");
659 snprintf(buf,sizeof(buf), "CDB %s MAIN %lu",
660 r==-1 ? "TRUNCATED" : "SYNTAX", (unsigned long)errpos);
661 Tcl_SetObjErrorCode(ip, Tcl_NewStringObj(buf,-1));
662 snprintf(buf,sizeof(buf), "%lu", (unsigned long)errpos);
665 r==-1 ? "unexpected eof (truncated file)"
666 " in .main during compact, at file position "
668 " in .main during compact, at file position ",
681 cdbfd= open(pathbuf_sfx(&rw->pbsome,".tmp"), O_WRONLY|O_CREAT|O_TRUNC, 0666);
682 if (cdbfd<0) PE("create .tmp for new cdb during compact");
684 r= cdb_make_start(&a.cdbm, cdbfd);
685 if (r) PE("cdb_make_start during compact");
688 r= ht_forall(&rw->logincore, addto_cdb, &a);
689 if (r) PE("cdb_make_add during compact");
691 r= cdb_make_finish(&a.cdbm);
692 if(r) PE("cdb_make_finish during compact");
695 r= fdatasync(cdbfd); if (r) PE("fdatasync new cdb during compact");
696 r= close(cdbfd); if (r) PE("close new cdb during compact");
699 r= rename(rw->pbsome.buf, pathbuf_sfx(&rw->pbother,".cdb"));
700 if (r) PE("install new .cdb during compact");
702 /* create new main */
704 a.mainfile= fopen(pathbuf_sfx(&rw->pbsome,".tmp"), "w");
705 if (!a.mainfile) PE("create .tmp for new main during compact");
707 r= ht_forall(&rw->logincore, addto_main, &a);
708 if (r) { rc= cht_posixerr(ip, errno, "error writing to new .main"
709 " during compact"); goto x_rc; }
711 r= putc('\n', a.mainfile);
712 if (r==EOF) PE("write trailing \n to main during compact");
714 r= fflush(a.mainfile); if (r) PE("fflush new main during compact");
715 r= fdatasync(fileno(a.mainfile));
716 if (r) PE("fdatasync new main during compact");
718 newmainsz= ftello(a.mainfile);
719 if (newmainsz<0) PE("ftello new main during compact");
721 r= fclose(a.mainfile); if (r) PE("fclose new main during compact");
724 r= rename(rw->pbsome.buf, pathbuf_sfx(&rw->pbother,".main"));
725 if (r) PE("install new .main during compact");
727 rw->mainsz= newmainsz;
731 rc= infocb(ip, rw, "compact-end", "main=%luby nrecs=%ld",
732 (unsigned long)rw->mainsz, *a.reccount);
738 if (a.mainfile) fclose(a.mainfile);
739 if (cdbmaking) cdb_make_finish(&a.cdbm);
741 remove(pathbuf_sfx(&rw->pbsome,".tmp")); /* for tidyness */
745 /*---------- Closing ----------*/
747 static int compact_forclose(Tcl_Interp *ip, Rw *rw, long *reccount_r) {
751 logsz= ftello(rw->logfile);
752 if (logsz < 0) PE("ftello logfile (during tidy close)");
754 rc= compact_core(ip, rw, logsz, reccount_r); if (rc) goto x_rc;
756 r= remove(pathbuf_sfx(&rw->pbsome,".jrn"));
757 if (r) PE("remove .jrn (during tidy close)");
764 int cht_do_cdbwr_close(ClientData cd, Tcl_Interp *ip, void *rw_v) {
770 if (rw->autocompact) rc= compact_forclose(ip, rw, &reccount);
775 logsz= ftello(rw->logfile);
777 rc= cht_posixerr(ip, errno, "ftell logfile during close info");
779 rc= infocb(ip, rw, "close", "main=%luby log=%luby",
781 } else if (reccount>=0) {
782 rc= infocb(ip, rw, "close", "main=%luby nrecs=%ld",
783 rw->mainsz, reccount);
785 rc= infocb(ip, rw, "close", "main=%luby", rw->mainsz);
788 rc_close= rw_close(ip,rw);
789 if (rc_close) rc= rc_close;
791 cht_tabledataid_disposing(ip, rw_v, &cdbtcl_rwdatabases);
796 /*---------- Other compaction-related entrypoints ----------*/
798 static int compact_keepopen(Tcl_Interp *ip, Rw *rw, int force) {
803 logsz= ftello(rw->logfile);
804 if (logsz < 0) return cht_posixerr(ip, errno, "ftell .jrn"
805 " during compact check or force");
807 if (!force && logsz < rw->mainsz / 3 + 1000) return TCL_OK;
808 /* Test case: ^^^ testing best value for this
809 * main=9690434by nrecs=122803 read all in one go
810 * no autocompact, : 6.96user 0.68system 0:08.93elapsed
811 * auto, mulitplier 2: 7.10user 0.79system 0:09.54elapsed
812 * auto, unity: 7.80user 0.98system 0:11.84elapsed
813 * auto, divisor 2: 8.23user 1.05system 0:13.30elapsed
814 * auto, divisor 3: 8.55user 1.12system 0:12.88elapsed
815 * auto, divisor 5: 9.95user 1.43system 0:15.72elapsed
818 rc= compact_core(ip, rw, logsz, &reccount); if (rc) goto x_rc;
821 ht_destroy(&rw->logincore);
822 ht_setup(&rw->logincore);
824 rw->cdb_fd= open(pathbuf_sfx(&rw->pbsome,".cdb"), O_RDONLY);
825 if (rw->cdb_fd < 0) PE("reopen .cdb after compact");
827 rc= cdbinit(ip, rw); if (rc) goto x_rc;
829 rw->logfile= fopen(pathbuf_sfx(&rw->pbsome,".jrn"), "w");
830 if (!rw->logfile) PE("reopen .jrn after compact");
832 r= fsync(fileno(rw->logfile)); if (r) PE("fsync .jrn after compact reopen");
837 /* doom! all updates fail after this (because rw->logfile is 0), and
838 * we may be using a lot more RAM than would be ideal. Program will
839 * have to reopen if it really wants sanity. */
843 int cht_do_cdbwr_compact_force(ClientData cd, Tcl_Interp *ip, void *rw_v) {
844 return compact_keepopen(ip, rw_v, 1);
846 int cht_do_cdbwr_compact_check(ClientData cd, Tcl_Interp *ip, void *rw_v) {
847 return compact_keepopen(ip, rw_v, 0);
850 int cht_do_cdbwr_compact_explicit(ClientData cd, Tcl_Interp *ip, void *rw_v) {
855 int cht_do_cdbwr_compact_auto(ClientData cd, Tcl_Interp *ip, void *rw_v) {
861 /*---------- Updateing ----------*/
863 static int update(Tcl_Interp *ip, Rw *rw, const char *key,
864 const Byte *data, int dlen) {
870 if (strlen(key) >= KEYLEN_MAX)
871 return cht_staticerr(ip, "key too long", "CDB KEYOVERFLOW");
873 if (!rw->logfile) return cht_staticerr
874 (ip, "failure during previous compact or error recovery;"
875 " cdbwr must be closed and reopened before any further updates",
878 recstart= ftello(rw->logfile);
880 return cht_posixerr(ip, errno, "failed to ftello .jrn during update");
882 val= htv_prep(dlen); assert(val);
883 memcpy(htv_fillptr(val), data, dlen);
885 r= writerecord(rw->logfile, key, val);
886 if (!r) r= fflush(rw->logfile);
887 if (r) PE("write update to logfile");
889 ht_update(&rw->logincore, key, val);
891 if (!rw->autocompact) return TCL_OK;
892 return compact_keepopen(ip, rw, 0);
898 /* Now, we have to try to sort out the journal so that it's
899 * truncated and positioned to where this abortively-written record
900 * started, with no buffered output and the error indicator clear.
902 * There seems to be no portable way to ensure the buffered unwritten
903 * output is discarded, so we close and reopen the stream.
907 rw->logfile= fopen(pathbuf_sfx(&rw->pbsome,".jrn"), "r+");
908 if (!rw->logfile) { failed= "fopen"; goto reset_fail; }
910 r= ftruncate(fileno(rw->logfile), recstart);
911 if (r) { failed= "ftruncate"; goto reset_fail; }
913 r= fseeko(rw->logfile, recstart, SEEK_SET);
914 if (r) { failed= "fseeko"; goto reset_fail; }
919 Tcl_AppendResult(ip, " (additionally, ", failed, " failed"
920 " in error recovery: ", strerror(errno), ")", (char*)0);
921 if (rw->logfile) { fclose(rw->logfile); rw->logfile= 0; }
926 int cht_do_cdbwr_update(ClientData cd, Tcl_Interp *ip,
927 void *rw_v, const char *key, Tcl_Obj *value) {
930 data= Tcl_GetStringFromObj(value, &dlen); assert(data);
931 return update(ip, rw_v, key, data, dlen);
934 int cht_do_cdbwr_update_hb(ClientData cd, Tcl_Interp *ip,
935 void *rw_v, const char *key, HBytes_Value value) {
936 return update(ip, rw_v, key, cht_hb_data(&value), cht_hb_len(&value));
939 int cht_do_cdbwr_delete(ClientData cd, Tcl_Interp *ip, void *rw_v,
941 return update(ip, rw_v, key, 0, 0);
944 /*---------- Lookups ----------*/
946 static int lookup_rw(Tcl_Interp *ip, void *rw_v, const char *key,
947 const Byte **data_r, int *len_r /* -1 => notfound */) {
949 const HashValue *val;
951 val= ht_lookup(&rw->logincore, key);
953 if (val->len) { *data_r= val->data; *len_r= val->len; return TCL_OK; }
957 if (rw->cdb_fd<0) goto not_found;
959 return cht_cdb_lookup_cdb(ip, &rw->cdb, key, strlen(key), data_r, len_r);
967 int cht_do_cdbwr_lookup(ClientData cd, Tcl_Interp *ip, void *rw_v,
968 const char *key, Tcl_Obj *def,
973 r= lookup_rw(ip, rw_v, key, &data, &dlen); if (r) return r;
974 return cht_cdb_donesomelookup(ip, rw_v, def, result, data, dlen,
975 cht_cdb_storeanswer_string);
978 int cht_do_cdbwr_lookup_hb(ClientData cd, Tcl_Interp *ip, void *rw_v,
979 const char *key, Tcl_Obj *def,
984 r= lookup_rw(ip, rw_v, key, &data, &dlen); if (r) return r;
985 return cht_cdb_donesomelookup(ip, rw_v, def, result, data, dlen,
986 cht_cdb_storeanswer_hb);