mirror of
https://github.com/fluencelabs/redis
synced 2025-03-18 16:40:50 +00:00
first version of append only file loading -- STILL BROKEN don't use it
This commit is contained in:
antirez
parent
412a8bcea3
commit
f80dff6212
280
redis.c
280
redis.c
@ -1666,86 +1666,6 @@ static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int di
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if (outv != static_outv) zfree(outv);
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}
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/* TODO: translate EXPIREs into EXPIRETOs */
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static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc) {
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sds buf = sdsempty();
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int j;
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ssize_t nwritten;
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time_t now;
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robj *tmpargv[3];
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/* The DB this command was targetting is not the same as the last command
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* we appendend. To issue a SELECT command is needed. */
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if (dictid != server.appendseldb) {
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char seldb[64];
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snprintf(seldb,sizeof(seldb),"%d",dictid);
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buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%d\r\n%s\r\n",
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strlen(seldb),seldb);
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server.appendseldb = dictid;
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}
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/* "Fix" the argv vector if the command is EXPIRE. We want to translate
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* EXPIREs into EXPIREATs calls */
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if (cmd->proc == expireCommand) {
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long when;
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tmpargv[0] = createStringObject("EXPIREAT",8);
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tmpargv[1] = argv[1];
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incrRefCount(argv[1]);
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when = time(NULL)+strtol(argv[2]->ptr,NULL,10);
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tmpargv[2] = createObject(REDIS_STRING,
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sdscatprintf(sdsempty(),"%ld",when));
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argv = tmpargv;
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}
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/* Append the actual command */
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buf = sdscatprintf(buf,"*%d\r\n",argc);
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for (j = 0; j < argc; j++) {
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robj *o = argv[j];
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if (o->encoding != REDIS_ENCODING_RAW)
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o = getDecodedObject(o);
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buf = sdscatprintf(buf,"$%d\r\n",sdslen(o->ptr));
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buf = sdscatlen(buf,o->ptr,sdslen(o->ptr));
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buf = sdscatlen(buf,"\r\n",2);
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if (o != argv[j])
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decrRefCount(o);
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}
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/* Free the objects from the modified argv for EXPIREAT */
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if (cmd->proc == expireCommand) {
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for (j = 0; j < 3; j++)
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decrRefCount(argv[j]);
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}
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/* We want to perform a single write. This should be guaranteed atomic
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* at least if the filesystem we are writing is a real physical one.
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* While this will save us against the server being killed I don't think
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* there is much to do about the whole server stopping for power problems
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* or alike */
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nwritten = write(server.appendfd,buf,sdslen(buf));
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if (nwritten != (signed)sdslen(buf)) {
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/* Ooops, we are in troubles. The best thing to do for now is
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* to simply exit instead to give the illusion that everything is
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* working as expected. */
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if (nwritten == -1) {
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redisLog(REDIS_WARNING,"Aborting on error writing to the append-only file: %s",strerror(errno));
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} else {
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redisLog(REDIS_WARNING,"Aborting on short write while writing to the append-only file: %s",strerror(errno));
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}
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abort();
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}
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now = time(NULL);
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if (server.appendfsync == APPENDFSYNC_ALWAYS ||
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(server.appendfsync == APPENDFSYNC_EVERYSEC &&
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now-server.lastfsync > 1))
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{
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fsync(server.appendfd); /* Let's try to get this data on the disk */
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server.lastfsync = now;
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}
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}
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static void processInputBuffer(redisClient *c) {
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again:
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if (c->bulklen == -1) {
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@ -2834,7 +2754,7 @@ static int rdbLoad(char *filename) {
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eoferr: /* unexpected end of file is handled here with a fatal exit */
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if (keyobj) decrRefCount(keyobj);
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redisLog(REDIS_WARNING,"Short read or OOM loading DB. Unrecoverable error, exiting now.");
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redisLog(REDIS_WARNING,"Short read or OOM loading DB. Unrecoverable error, aborting now.");
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exit(1);
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return REDIS_ERR; /* Just to avoid warning */
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}
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@ -5334,6 +5254,195 @@ static void freeMemoryIfNeeded(void) {
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}
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}
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/* ============================== Append Only file ========================== */
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static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc) {
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sds buf = sdsempty();
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int j;
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ssize_t nwritten;
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time_t now;
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robj *tmpargv[3];
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/* The DB this command was targetting is not the same as the last command
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* we appendend. To issue a SELECT command is needed. */
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if (dictid != server.appendseldb) {
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char seldb[64];
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snprintf(seldb,sizeof(seldb),"%d",dictid);
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buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%d\r\n%s\r\n",
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strlen(seldb),seldb);
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server.appendseldb = dictid;
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}
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/* "Fix" the argv vector if the command is EXPIRE. We want to translate
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* EXPIREs into EXPIREATs calls */
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if (cmd->proc == expireCommand) {
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long when;
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tmpargv[0] = createStringObject("EXPIREAT",8);
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tmpargv[1] = argv[1];
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incrRefCount(argv[1]);
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when = time(NULL)+strtol(argv[2]->ptr,NULL,10);
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tmpargv[2] = createObject(REDIS_STRING,
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sdscatprintf(sdsempty(),"%ld",when));
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argv = tmpargv;
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}
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/* Append the actual command */
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buf = sdscatprintf(buf,"*%d\r\n",argc);
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for (j = 0; j < argc; j++) {
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robj *o = argv[j];
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if (o->encoding != REDIS_ENCODING_RAW)
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o = getDecodedObject(o);
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buf = sdscatprintf(buf,"$%d\r\n",sdslen(o->ptr));
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buf = sdscatlen(buf,o->ptr,sdslen(o->ptr));
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buf = sdscatlen(buf,"\r\n",2);
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if (o != argv[j])
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decrRefCount(o);
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}
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/* Free the objects from the modified argv for EXPIREAT */
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if (cmd->proc == expireCommand) {
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for (j = 0; j < 3; j++)
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decrRefCount(argv[j]);
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}
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/* We want to perform a single write. This should be guaranteed atomic
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* at least if the filesystem we are writing is a real physical one.
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* While this will save us against the server being killed I don't think
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* there is much to do about the whole server stopping for power problems
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* or alike */
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nwritten = write(server.appendfd,buf,sdslen(buf));
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if (nwritten != (signed)sdslen(buf)) {
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/* Ooops, we are in troubles. The best thing to do for now is
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* to simply exit instead to give the illusion that everything is
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* working as expected. */
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if (nwritten == -1) {
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redisLog(REDIS_WARNING,"Exiting on error writing to the append-only file: %s",strerror(errno));
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} else {
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redisLog(REDIS_WARNING,"Exiting on short write while writing to the append-only file: %s",strerror(errno));
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}
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exit(1);
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}
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now = time(NULL);
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if (server.appendfsync == APPENDFSYNC_ALWAYS ||
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(server.appendfsync == APPENDFSYNC_EVERYSEC &&
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now-server.lastfsync > 1))
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{
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fsync(server.appendfd); /* Let's try to get this data on the disk */
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server.lastfsync = now;
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}
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}
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/* In Redis commands are always executed in the context of a client, so in
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* order to load the append only file we need to create a fake client. */
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static struct redisClient *createFakeClient(void) {
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struct redisClient *c = zmalloc(sizeof(*c));
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selectDb(c,0);
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c->fd = -1;
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c->querybuf = sdsempty();
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c->argc = 0;
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c->argv = NULL;
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c->flags = 0;
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c->reply = listCreate();
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listSetFreeMethod(c->reply,decrRefCount);
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listSetDupMethod(c->reply,dupClientReplyValue);
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return c;
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}
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static void freeFakeClient(struct redisClient *c) {
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sdsfree(c->querybuf);
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listRelease(c->reply);
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zfree(c);
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}
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/* Replay the append log file. On error REDIS_OK is returned. On non fatal
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* error (the append only file is zero-length) REDIS_ERR is returned. On
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* fatal error an error message is logged and the program exists. */
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int loadAppendOnlyFile(char *filename) {
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struct redisClient *fakeClient;
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FILE *fp = fopen(filename,"r");
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struct redis_stat sb;
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if (redis_fstat(fileno(fp),&sb) != -1 && sb.st_size == 0)
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return REDIS_ERR;
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if (fp == NULL) {
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redisLog(REDIS_WARNING,"Fatal error: can't open the append log file for reading: %s",strerror(errno));
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exit(1);
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}
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fakeClient = createFakeClient();
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while(1) {
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int argc, j;
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unsigned long len;
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robj **argv;
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char buf[128];
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sds argsds;
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struct redisCommand *cmd;
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if (fgets(buf,sizeof(buf),fp) == NULL) {
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if (feof(fp))
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break;
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else
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goto readerr;
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}
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if (buf[0] != '*') goto fmterr;
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argc = atoi(buf+1);
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argv = zmalloc(sizeof(robj*)*argc);
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for (j = 0; j < argc; j++) {
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if (fgets(buf,sizeof(buf),fp) == NULL) goto readerr;
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if (buf[0] != '$') goto fmterr;
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len = strtol(buf+1,NULL,10);
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argsds = sdsnewlen(NULL,len);
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if (fread(argsds,len,1,fp) == 0) goto fmterr;
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argv[j] = createObject(REDIS_STRING,argsds);
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if (fread(buf,2,1,fp) == 0) goto fmterr; /* discard CRLF */
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}
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/* Command lookup */
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cmd = lookupCommand(argv[0]->ptr);
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if (!cmd) {
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redisLog(REDIS_WARNING,"Unknown command '%s' reading the append only file", argv[0]->ptr);
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exit(1);
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}
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/* Try object sharing and encoding */
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if (server.shareobjects) {
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int j;
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for(j = 1; j < argc; j++)
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argv[j] = tryObjectSharing(argv[j]);
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}
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if (cmd->flags & REDIS_CMD_BULK)
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tryObjectEncoding(argv[argc-1]);
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/* Run the command in the context of a fake client */
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fakeClient->argc = argc;
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fakeClient->argv = argv;
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cmd->proc(fakeClient);
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/* Discard the reply objects list from the fake client */
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while(listLength(fakeClient->reply))
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listDelNode(fakeClient->reply,listFirst(fakeClient->reply));
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/* Clean up, ready for the next command */
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for (j = 0; j < argc; j++) decrRefCount(argv[j]);
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zfree(argv);
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}
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fclose(fp);
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freeFakeClient(fakeClient);
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return REDIS_OK;
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readerr:
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if (feof(fp)) {
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redisLog(REDIS_WARNING,"Unexpected end of file reading the append only file");
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} else {
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redisLog(REDIS_WARNING,"Unrecoverable error reading the append only file: %s", strerror(errno));
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}
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exit(1);
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fmterr:
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redisLog(REDIS_WARNING,"Bad file format reading the append only file");
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exit(1);
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}
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/* ================================= Debugging ============================== */
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static void debugCommand(redisClient *c) {
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@ -5666,8 +5775,13 @@ int main(int argc, char **argv) {
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#ifdef __linux__
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linuxOvercommitMemoryWarning();
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#endif
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if (rdbLoad(server.dbfilename) == REDIS_OK)
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redisLog(REDIS_NOTICE,"DB loaded from disk");
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if (server.appendonly) {
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if (loadAppendOnlyFile(server.appendfilename) == REDIS_OK)
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redisLog(REDIS_NOTICE,"DB loaded from append only file");
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} else {
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if (rdbLoad(server.dbfilename) == REDIS_OK)
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redisLog(REDIS_NOTICE,"DB loaded from disk");
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}
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if (aeCreateFileEvent(server.el, server.fd, AE_READABLE,
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acceptHandler, NULL, NULL) == AE_ERR) oom("creating file event");
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redisLog(REDIS_NOTICE,"The server is now ready to accept connections on port %d", server.port);
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