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 htv_fill(HashValue *hd, const Byte *data) {
- memcpy(hd->data, data, hd->len);
-}
static void ht_setup(HashTable *ht) {
Tcl_InitHashTable(&ht->t, TCL_STRING_KEYS);
Tcl_SetHashValue(he, val_eat);
}
+static fixme ht_lookup(HashTable *ht, const char *key) {
+ Tcl_HashEntry *he;
+ const HashValue *htv;
+
+ he= Tcl_FindHashEntry(ht, key);
+ if (!he) return notfound;
+
+ htv= Tcl_GetHashValue(he);
+
+}
+
static int ht_forall(HashTable *ht,
int (*fn)(const char *key, HashValue *val,
struct ht_forall_ctx *ctx),
int ix, autocompact;
int cdb_fd, lock_fd;
struct cdb cdb; /* valid iff cdb_fd >= 0 */
- off_t cdb_bytes; /* valid iff cdb_fd >= 0 */
FILE *logfile;
HashTable logincore;
Pathbuf pbsome, pbother;
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);
return TCL_OK;
}
-/*---------- Log reading ----------*/
+/*---------- Log reading and writing ----------*/
static int readlognum(FILE *f, int delim, int *num_r) {
int c;
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,
/*---------- 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) {
rw->cdb_fd= open(pathbuf_sfx(&rw->pbsome,".cdb"), O_RDONLY);
if (rw->cdb_fd >=0) {
- 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; goto x_rc;
- }
+ 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 -"
return rc;
}
-/*==================== COMPACTING ====================*/
+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;
static int addto_main(const char *key, HashValue *val,
struct ht_forall_ctx *a) {
- int r;
-
(*a->reccount)++;
-
- r= fprintf(a->mainfile, "+%d,%d:%s->", strlen(key), val->len, key);
- if (r<0) return -1;
-
- r= fwrite(val->data, 1, val->len, a->mainfile);
- if (r != val->len) return -1;
-
- return 0;
+ return writerecord(a->mainfile, key, val);
}
/*---------- compact main entrypoint ----------*/
-static int compact_core(Tcl_Interp *ip, Rw *rw, unsigned long logsize,
+static int compact_core(Tcl_Interp *ip, Rw *rw, unsigned long logsz,
long *reccount_r) {
/* creates new .cdb and .main
* closes logfile
rw->logfile= 0;
rc= infocb(ip, rw, "compact-start", "log=%luby main=%luby",
- logsize, (unsigned long)rw->mainsz);
+ logsz, (unsigned long)rw->mainsz);
if (rc) goto x_rc;
if (rw->on_lexminval.llength) {
/* done! */
- rc= infocb(ip, rw, "compact-end", "log=%luby main=%luby nrecs=%l",
- logsize, (unsigned long)rw->mainsz, *a.reccount);
+ rc= infocb(ip, rw, "compact-end", "main=%luby nrecs=%l",
+ (unsigned long)rw->mainsz, *a.reccount);
if (rc) goto x_rc;
- rc= TCL_OK;
+ 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 ----------*/
return rc;
}
-/*==================== Other entrypoints ====================*/
+/*---------- 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(Tcl_Interp *ip, Rw *rw, const char *key, ) {
+ ht_lookup(
+
+int cht_do_cdbwr_lookup(ClientData cd, Tcl_Interp *ip, void *db,
+ const char *key, Tcl_Obj *def, Tcl_Obj **result) {
+
+}
+
+int cht_do_cdbwr_lookup_hb(ClientData cd, Tcl_Interp *ip, void *db, const char *key, HBytes_Value def, HBytes_Value *result);
~ian / chiark-tcl.git / blobdiff