*/
#include "redis.h"
+#include "sha1.h"
#include <fcntl.h>
#include <sys/stat.h>
+#include <dirent.h>
+
+int create256dir(char *prefix) {
+ char buf[1024];
+ int j;
+
+ for (j = 0; j < 256; j++) {
+ snprintf(buf,sizeof(buf),"%s%02x",prefix,j);
+ if (mkdir(buf,0755) == -1) {
+ redisLog(REDIS_WARNING,"Error creating dir %s for diskstore: %s",
+ buf,strerror(errno));
+ return REDIS_ERR;
+ }
+ }
+ return REDIS_OK;
+}
int dsOpen(void) {
struct stat sb;
- int retval;
+ int retval, j;
char *path = server.ds_path;
+ char buf[1024];
if ((retval = stat(path,&sb) == -1) && errno != ENOENT) {
redisLog(REDIS_WARNING, "Error opening disk store at %s: %s",
}
/* Directory already in place. Assume everything is ok. */
- if (retval == 0 && S_ISDIR(sb.st_mode)) return REDIS_OK;
+ if (retval == 0 && S_ISDIR(sb.st_mode)) {
+ redisLog(REDIS_NOTICE,"Disk store %s exists", path);
+ return REDIS_OK;
+ }
/* File exists but it's not a directory */
if (retval == 0 && !S_ISDIR(sb.st_mode)) {
/* New disk store, create the directory structure now, as creating
* them in a lazy way is not a good idea, after very few insertions
* we'll need most of the 65536 directories anyway. */
- if (mkdir(path) == -1) {
+ redisLog(REDIS_NOTICE,"Disk store %s does not exist: creating", path);
+ if (mkdir(path,0755) == -1) {
redisLog(REDIS_WARNING,"Disk store init failed creating dir %s: %s",
path, strerror(errno));
return REDIS_ERR;
}
+ /* Create the top level 256 directories */
+ snprintf(buf,sizeof(buf),"%s/",path);
+ if (create256dir(buf) == REDIS_ERR) return REDIS_ERR;
+
+ /* For every 256 top level dir, create 256 nested dirs */
+ for (j = 0; j < 256; j++) {
+ snprintf(buf,sizeof(buf),"%s/%02x/",path,j);
+ if (create256dir(buf) == REDIS_ERR) return REDIS_ERR;
+ }
return REDIS_OK;
}
return REDIS_OK;
}
+/* Convert key into full path for this object. Dirty but hopefully
+ * is fast enough. Returns the length of the returned path. */
+int dsKeyToPath(redisDb *db, char *buf, robj *key) {
+ SHA1_CTX ctx;
+ unsigned char hash[20];
+ char hex[40], digits[] = "0123456789abcdef";
+ int j, l;
+ char *origbuf = buf;
+
+ SHA1Init(&ctx);
+ SHA1Update(&ctx,key->ptr,sdslen(key->ptr));
+ SHA1Final(hash,&ctx);
+
+ /* Convert the hash into hex format */
+ for (j = 0; j < 20; j++) {
+ hex[j*2] = digits[(hash[j]&0xF0)>>4];
+ hex[(j*2)+1] = digits[hash[j]&0x0F];
+ }
+
+ /* Create the object path. Start with server.ds_path that's the root dir */
+ l = sdslen(server.ds_path);
+ memcpy(buf,server.ds_path,l);
+ buf += l;
+ *buf++ = '/';
+
+ /* Then add xx/yy/ that is the two level directories */
+ buf[0] = hex[0];
+ buf[1] = hex[1];
+ buf[2] = '/';
+ buf[3] = hex[2];
+ buf[4] = hex[3];
+ buf[5] = '/';
+ buf += 6;
+
+ /* Add the database number followed by _ and finall the SHA1 hex */
+ l = ll2string(buf,64,db->id);
+ buf += l;
+ buf[0] = '_';
+ memcpy(buf+1,hex,40);
+ buf[41] = '\0';
+ return (buf-origbuf)+41;
+}
+
int dsSet(redisDb *db, robj *key, robj *val) {
+ char buf[1024], buf2[1024];
+ FILE *fp;
+ int retval, len;
+
+ len = dsKeyToPath(db,buf,key);
+ memcpy(buf2,buf,len);
+ snprintf(buf2+len,sizeof(buf2)-len,"_%ld_%ld",(long)time(NULL),(long)val);
+ while ((fp = fopen(buf2,"w")) == NULL) {
+ if (errno == ENOSPC) {
+ redisLog(REDIS_WARNING,"Diskstore: No space left on device. Please make room and wait 30 seconds for Redis to continue.");
+ sleep(30);
+ } else {
+ redisLog(REDIS_WARNING,"diskstore error opening %s: %s",
+ buf2, strerror(errno));
+ redisPanic("Unrecoverable diskstore error. Exiting.");
+ }
+ }
+ if ((retval = rdbSaveKeyValuePair(fp,db,key,val,time(NULL))) == -1)
+ return REDIS_ERR;
+ fclose(fp);
+ if (retval == 0) {
+ /* Expired key. Unlink failing not critical */
+ unlink(buf);
+ unlink(buf2);
+ } else {
+ /* Use rename for atomic updadte of value */
+ if (rename(buf2,buf) == -1) {
+ redisLog(REDIS_WARNING,"rename(2) returned an error: %s",
+ strerror(errno));
+ redisPanic("Unrecoverable diskstore error. Exiting.");
+ }
+ }
+ return REDIS_OK;
}
-robj *dsGet(redisDb *db, robj *key) {
+robj *dsGet(redisDb *db, robj *key, time_t *expire) {
+ char buf[1024];
+ int type;
+ time_t expiretime = -1; /* -1 means: no expire */
+ robj *dskey; /* Key as loaded from disk. */
+ robj *val;
+ FILE *fp;
+
+ dsKeyToPath(db,buf,key);
+ fp = fopen(buf,"r");
+ if (fp == NULL && errno == ENOENT) return NULL; /* No such key */
+ if (fp == NULL) {
+ redisLog(REDIS_WARNING,"Disk store failed opening %s: %s",
+ buf, strerror(errno));
+ goto readerr;
+ }
+
+ if ((type = rdbLoadType(fp)) == -1) goto readerr;
+ if (type == REDIS_EXPIRETIME) {
+ if ((expiretime = rdbLoadTime(fp)) == -1) goto readerr;
+ /* We read the time so we need to read the object type again */
+ if ((type = rdbLoadType(fp)) == -1) goto readerr;
+ }
+ /* Read key */
+ if ((dskey = rdbLoadStringObject(fp)) == NULL) goto readerr;
+ /* Read value */
+ if ((val = rdbLoadObject(type,fp)) == NULL) goto readerr;
+ fclose(fp);
+
+ /* The key we asked, and the key returned, must be the same */
+ redisAssert(equalStringObjects(key,dskey));
+
+ /* Check if the key already expired */
+ decrRefCount(dskey);
+ if (expiretime != -1 && expiretime < time(NULL)) {
+ decrRefCount(val);
+ unlink(buf); /* This failing is non critical here */
+ return NULL;
+ }
+
+ /* Everything ok... */
+ *expire = expiretime;
+ return val;
+
+readerr:
+ redisLog(REDIS_WARNING,"Read error reading reading %s. Corrupted key?",
+ buf);
+ redisPanic("Unrecoverable error reading from disk store");
+ return NULL; /* unreached */
}
int dsDel(redisDb *db, robj *key) {
+ char buf[1024];
+
+ dsKeyToPath(db,buf,key);
+ if (unlink(buf) == -1) {
+ if (errno == ENOENT) {
+ return REDIS_ERR;
+ } else {
+ redisLog(REDIS_WARNING,"Disk store can't remove %s: %s",
+ buf, strerror(errno));
+ redisPanic("Unrecoverable Disk store errore. Existing.");
+ return REDIS_ERR; /* unreached */
+ }
+ } else {
+ return REDIS_OK;
+ }
}
int dsExists(redisDb *db, robj *key) {
+ char buf[1024];
+
+ dsKeyToPath(db,buf,key);
+ return access(buf,R_OK) == 0;
+}
+
+void dsFlushOneDir(char *path, int dbid) {
+ DIR *dir;
+ struct dirent *dp, de;
+
+ dir = opendir(path);
+ if (dir == NULL) {
+ redisLog(REDIS_WARNING,"Disk store can't open dir %s: %s",
+ path, strerror(errno));
+ redisPanic("Unrecoverable Disk store errore. Existing.");
+ }
+ while(1) {
+ char buf[1024];
+
+ readdir_r(dir,&de,&dp);
+ if (dp == NULL) break;
+ if (dp->d_name[0] == '.') continue;
+
+ /* Check if we need to remove this entry accordingly to the
+ * DB number */
+ if (dbid != -1) {
+ char id[64];
+ char *p = strchr(dp->d_name,'_');
+ int len = (p - dp->d_name);
+
+ redisAssert(p != NULL && len < 64);
+ memcpy(id,dp->d_name,len);
+ id[len] = '\0';
+ if (atoi(id) != dbid) continue; /* skip this file */
+ }
+
+ /* Finally unlink the file */
+ snprintf(buf,1024,"%s/%s",path,dp->d_name);
+ if (unlink(buf) == -1) {
+ redisLog(REDIS_WARNING,
+ "Can't unlink %s: %s", buf, strerror(errno));
+ redisPanic("Unrecoverable Disk store errore. Existing.");
+ }
+ }
+ closedir(dir);
+}
+
+void dsFlushDb(int dbid) {
+ char buf[1024];
+ int j, i;
+
+ redisLog(REDIS_NOTICE,"Flushing diskstore DB (%d)",dbid);
+ for (j = 0; j < 256; j++) {
+ for (i = 0; i < 256; i++) {
+ snprintf(buf,1024,"%s/%02x/%02x",server.ds_path,j,i);
+ dsFlushOneDir(buf,dbid);
+ }
+ }
+}
+
+int dsRdbSave(char *filename) {
+ char tmpfile[256];
+ int j, i;
+ time_t now = time(NULL);
+
+ snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
+ fp = fopen(tmpfile,"w");
+ if (!fp) {
+ redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno));
+ return REDIS_ERR;
+ }
+ if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
+
+ /* Scan all diskstore dirs looking for keys */
+ for (j = 0; j < 256; j++) {
+ for (i = 0; i < 256; i++) {
+ snprintf(buf,1024,"%s/%02x/%02x",server.ds_path,j,i);
+
+ /* Write the SELECT DB opcode */
+ if (rdbSaveType(fp,REDIS_SELECTDB) == -1) goto werr;
+ if (rdbSaveLen(fp,j) == -1) goto werr;
+ }
+ }
+
+ /* Make sure data will not remain on the OS's output buffers */
+ fflush(fp);
+ fsync(fileno(fp));
+ fclose(fp);
+
+ /* Use RENAME to make sure the DB file is changed atomically only
+ * if the generate DB file is ok. */
+ if (rename(tmpfile,filename) == -1) {
+ redisLog(REDIS_WARNING,"Error moving temp DB file on the final destination: %s", strerror(errno));
+ unlink(tmpfile);
+ return REDIS_ERR;
+ }
+ redisLog(REDIS_NOTICE,"DB saved on disk");
+ server.dirty = 0;
+ server.lastsave = time(NULL);
+ return REDIS_OK;
+
+werr:
+ fclose(fp);
+ unlink(tmpfile);
+ redisLog(REDIS_WARNING,"Write error saving DB on disk: %s", strerror(errno));
}
projects / redis.git / blobdiff