漫话Redis源码之七十二

这里主要是枚举和配置相关的：

configEnum syslog_facility_enum[] = {
    {"user",    LOG_USER},
    {"local0",  LOG_LOCAL0},
    {"local1",  LOG_LOCAL1},
    {"local2",  LOG_LOCAL2},
    {"local3",  LOG_LOCAL3},
    {"local4",  LOG_LOCAL4},
    {"local5",  LOG_LOCAL5},
    {"local6",  LOG_LOCAL6},
    {"local7",  LOG_LOCAL7},
    {NULL, 0}
};
 
configEnum loglevel_enum[] = {
    {"debug", LL_DEBUG},
    {"verbose", LL_VERBOSE},
    {"notice", LL_NOTICE},
    {"warning", LL_WARNING},
    {NULL,0}
};
 
configEnum supervised_mode_enum[] = {
    {"upstart", SUPERVISED_UPSTART},
    {"systemd", SUPERVISED_SYSTEMD},
    {"auto", SUPERVISED_AUTODETECT},
    {"no", SUPERVISED_NONE},
    {NULL, 0}
};
 
configEnum aof_fsync_enum[] = {
    {"everysec", AOF_FSYNC_EVERYSEC},
    {"always", AOF_FSYNC_ALWAYS},
    {"no", AOF_FSYNC_NO},
    {NULL, 0}
};
 
configEnum repl_diskless_load_enum[] = {
    {"disabled", REPL_DISKLESS_LOAD_DISABLED},
    {"on-empty-db", REPL_DISKLESS_LOAD_WHEN_DB_EMPTY},
    {"swapdb", REPL_DISKLESS_LOAD_SWAPDB},
    {NULL, 0}
};
 
configEnum tls_auth_clients_enum[] = {
    {"no", TLS_CLIENT_AUTH_NO},
    {"yes", TLS_CLIENT_AUTH_YES},
    {"optional", TLS_CLIENT_AUTH_OPTIONAL},
    {NULL, 0}
};
 
configEnum oom_score_adj_enum[] = {
    {"no", OOM_SCORE_ADJ_NO},
    {"yes", OOM_SCORE_RELATIVE},
    {"relative", OOM_SCORE_RELATIVE},
    {"absolute", OOM_SCORE_ADJ_ABSOLUTE},
    {NULL, 0}
};
 
configEnum acl_pubsub_default_enum[] = {
    {"allchannels", USER_FLAG_ALLCHANNELS},
    {"resetchannels", 0},
    {NULL, 0}
};
 
configEnum sanitize_dump_payload_enum[] = {
    {"no", SANITIZE_DUMP_NO},
    {"yes", SANITIZE_DUMP_YES},
    {"clients", SANITIZE_DUMP_CLIENTS},
    {NULL, 0}
};
 
/* Output buffer limits presets. */
clientBufferLimitsConfig clientBufferLimitsDefaults[CLIENT_TYPE_OBUF_COUNT] = {
    {0, 0, 0}, /* normal */
    {1024*1024*256, 1024*1024*64, 60}, /* slave */
    {1024*1024*32, 1024*1024*8, 60}  /* pubsub */
};
 
/* OOM Score defaults */
int configOOMScoreAdjValuesDefaults[CONFIG_OOM_COUNT] = { 0, 200, 800 };
 
/* Generic config infrastructure function pointers
 * int is_valid_fn(val, err)
 *     Return 1 when val is valid, and 0 when invalid.
 *     Optionally set err to a static error string.
 * int update_fn(val, prev, err)
 *     This function is called only for CONFIG SET command (not at config file parsing)
 *     It is called after the actual config is applied,
 *     Return 1 for success, and 0 for failure.
 *     Optionally set err to a static error string.
 *     On failure the config change will be reverted.
 */
 
/* Configuration values that require no special handling to set, get, load or
 * rewrite. */
typedef struct boolConfigData {
    int *config; /* The pointer to the server config this value is stored in */
    const int default_value; /* The default value of the config on rewrite */
    int (*is_valid_fn)(int val, const char **err); /* Optional function to check validity of new value (generic doc above) */
    int (*update_fn)(int val, int prev, const char **err); /* Optional function to apply new value at runtime (generic doc above) */
} boolConfigData;
 
typedef struct stringConfigData {
    char **config; /* Pointer to the server config this value is stored in. */
    const char *default_value; /* Default value of the config on rewrite. */
    int (*is_valid_fn)(char* val, const char **err); /* Optional function to check validity of new value (generic doc above) */
    int (*update_fn)(char* val, char* prev, const char **err); /* Optional function to apply new value at runtime (generic doc above) */
    int convert_empty_to_null; /* Boolean indicating if empty strings should
                                  be stored as a NULL value. */
} stringConfigData;
 
typedef struct sdsConfigData {
    sds *config; /* Pointer to the server config this value is stored in. */
    const char *default_value; /* Default value of the config on rewrite. */
    int (*is_valid_fn)(sds val, const char **err); /* Optional function to check validity of new value (generic doc above) */
    int (*update_fn)(sds val, sds prev, const char **err); /* Optional function to apply new value at runtime (generic doc above) */
    int convert_empty_to_null; /* Boolean indicating if empty SDS strings should
                                  be stored as a NULL value. */
} sdsConfigData;
 
typedef struct enumConfigData {
    int *config; /* The pointer to the server config this value is stored in */
    configEnum *enum_value; /* The underlying enum type this data represents */
    const int default_value; /* The default value of the config on rewrite */
    int (*is_valid_fn)(int val, const char **err); /* Optional function to check validity of new value (generic doc above) */
    int (*update_fn)(int val, int prev, const char **err); /* Optional function to apply new value at runtime (generic doc above) */
} enumConfigData;
 
typedef enum numericType {
    NUMERIC_TYPE_INT,
    NUMERIC_TYPE_UINT,
    NUMERIC_TYPE_LONG,
    NUMERIC_TYPE_ULONG,
    NUMERIC_TYPE_LONG_LONG,
    NUMERIC_TYPE_ULONG_LONG,
    NUMERIC_TYPE_SIZE_T,
    NUMERIC_TYPE_SSIZE_T,
    NUMERIC_TYPE_OFF_T,
    NUMERIC_TYPE_TIME_T,
} numericType;
 
typedef struct numericConfigData {
    union {
        int *i;
        unsigned int *ui;
        long *l;
        unsigned long *ul;
        long long *ll;
        unsigned long long *ull;
        size_t *st;
        ssize_t *sst;
        off_t *ot;
        time_t *tt;
    } config; /* The pointer to the numeric config this value is stored in */
    int is_memory; /* Indicates if this value can be loaded as a memory value */
    numericType numeric_type; /* An enum indicating the type of this value */
    long long lower_bound; /* The lower bound of this numeric value */
    long long upper_bound; /* The upper bound of this numeric value */
    const long long default_value; /* The default value of the config on rewrite */
    int (*is_valid_fn)(long long val, const char **err); /* Optional function to check validity of new value (generic doc above) */
    int (*update_fn)(long long val, long long prev, const char **err); /* Optional function to apply new value at runtime (generic doc above) */
} numericConfigData;
 
typedef union typeData {
    boolConfigData yesno;
    stringConfigData string;
    sdsConfigData sds;
    enumConfigData enumd;
    numericConfigData numeric;
} typeData;
 
typedef struct typeInterface {
    /* Called on server start, to init the server with default value */
    void (*init)(typeData data);
    /* Called on server startup and CONFIG SET, returns 1 on success, 0 on error
     * and can set a verbose err string, update is true when called from CONFIG SET */
    int (*set)(typeData data, sds value, int update, const char **err);
    /* Called on CONFIG GET, required to add output to the client */
    void (*get)(client *c, typeData data);
    /* Called on CONFIG REWRITE, required to rewrite the config state */
    void (*rewrite)(typeData data, const char *name, struct rewriteConfigState *state);
} typeInterface;
 
typedef struct standardConfig {
    const char *name; /* The user visible name of this config */
    const char *alias; /* An alias that can also be used for this config */
    const unsigned int flags; /* Flags for this specific config */
    typeInterface interface; /* The function pointers that define the type interface */
    typeData data; /* The type specific data exposed used by the interface */
} standardConfig;
 
#define MODIFIABLE_CONFIG 0 /* This is the implied default for a standard 
                             * config, which is mutable. */
#define IMMUTABLE_CONFIG (1ULL<<0) /* Can this value only be set at startup? */
#define SENSITIVE_CONFIG (1ULL<<1) /* Does this value contain sensitive information */
 
standardConfig configs[];
 
/*-----------------------------------------------------------------------------
 * Enum access functions
 *----------------------------------------------------------------------------*/
 
/* Get enum value from name. If there is no match INT_MIN is returned. */
int configEnumGetValue(configEnum *ce, char *name) {
    while(ce->name != NULL) {
        if (!strcasecmp(ce->name,name)) return ce->val;
        ce++;
    }
    return INT_MIN;
}
 
/* Get enum name from value. If no match is found NULL is returned. */
const char *configEnumGetName(configEnum *ce, int val) {
    while(ce->name != NULL) {
        if (ce->val == val) return ce->name;
        ce++;
    }
    return NULL;
}
 
/* Wrapper for configEnumGetName() returning "unknown" instead of NULL if
 * there is no match. */
const char *configEnumGetNameOrUnknown(configEnum *ce, int val) {
    const char *name = configEnumGetName(ce,val);
    return name ? name : "unknown";
}
 
/* Used for INFO generation. */
const char *evictPolicyToString(void) {
    return configEnumGetNameOrUnknown(maxmemory_policy_enum,server.maxmemory_policy);
}
 
/*-----------------------------------------------------------------------------
 * Config file parsing
 *----------------------------------------------------------------------------*/
 
int yesnotoi(char *s) {
    if (!strcasecmp(s,"yes")) return 1;
    else if (!strcasecmp(s,"no")) return 0;
    else return -1;
}
 
void appendServerSaveParams(time_t seconds, int changes) {
    server.saveparams = zrealloc(server.saveparams,sizeof(struct saveparam)*(server.saveparamslen+1));
    server.saveparams[server.saveparamslen].seconds = seconds;
    server.saveparams[server.saveparamslen].changes = changes;
    server.saveparamslen++;
}
 
void resetServerSaveParams(void) {
    zfree(server.saveparams);
    server.saveparams = NULL;
    server.saveparamslen = 0;
}
 
void queueLoadModule(sds path, sds *argv, int argc) {
    int i;
    struct moduleLoadQueueEntry *loadmod;
 
    loadmod = zmalloc(sizeof(struct moduleLoadQueueEntry));
    loadmod->argv = zmalloc(sizeof(robj*)*argc);
    loadmod->path = sdsnew(path);
    loadmod->argc = argc;
    for (i = 0; i < argc; i++) {
        loadmod->argv[i] = createRawStringObject(argv[i],sdslen(argv[i]));
    }
    listAddNodeTail(server.loadmodule_queue,loadmod);
}
 
/* Parse an array of CONFIG_OOM_COUNT sds strings, validate and populate
 * server.oom_score_adj_values if valid.
 */
 
static int updateOOMScoreAdjValues(sds *args, const char **err, int apply) {
    int i;
    int values[CONFIG_OOM_COUNT];
 
    for (i = 0; i < CONFIG_OOM_COUNT; i++) {
        char *eptr;
        long long val = strtoll(args[i], &eptr, 10);
 
        if (*eptr != '\0' || val < -2000 || val > 2000) {
            if (err) *err = "Invalid oom-score-adj-values, elements must be between -2000 and 2000.";
            return C_ERR;
        }
 
        values[i] = val;
    }
 
    /* Verify that the values make sense. If they don't omit a warning but
     * keep the configuration, which may still be valid for privileged processes.
     */
 
    if (values[CONFIG_OOM_REPLICA] < values[CONFIG_OOM_MASTER] ||
        values[CONFIG_OOM_BGCHILD] < values[CONFIG_OOM_REPLICA]) {
            serverLog(LOG_WARNING,
                    "The oom-score-adj-values configuration may not work for non-privileged processes! "
                    "Please consult the documentation.");
    }
 
    /* Store values, retain previous config for rollback in case we fail. */
    int old_values[CONFIG_OOM_COUNT];
    for (i = 0; i < CONFIG_OOM_COUNT; i++) {
        old_values[i] = server.oom_score_adj_values[i];
        server.oom_score_adj_values[i] = values[i];
    }
    
    /* When parsing the config file, we want to apply only when all is done. */
    if (!apply)
        return C_OK;
 
    /* Update */
    if (setOOMScoreAdj(-1) == C_ERR) {
        /* Roll back */
        for (i = 0; i < CONFIG_OOM_COUNT; i++)
            server.oom_score_adj_values[i] = old_values[i];
 
        if (err)
            *err = "Failed to apply oom-score-adj-values configuration, check server logs.";
 
        return C_ERR;
    }
 
    return C_OK;
}
 
void initConfigValues() {
    for (standardConfig *config = configs; config->name != NULL; config++) {
        config->interface.init(config->data);
    }
}
 
void loadServerConfigFromString(char *config) {
    const char *err = NULL;
    int linenum = 0, totlines, i;
    int slaveof_linenum = 0;
    sds *lines;
    int save_loaded = 0;
 
    lines = sdssplitlen(config,strlen(config),"\n",1,&totlines);
 
    for (i = 0; i < totlines; i++) {
        sds *argv;
        int argc;
 
        linenum = i+1;
        lines[i] = sdstrim(lines[i]," \t\r\n");
 
        /* Skip comments and blank lines */
        if (lines[i][0] == '#' || lines[i][0] == '\0') continue;
 
        /* Split into arguments */
        argv = sdssplitargs(lines[i],&argc);
        if (argv == NULL) {
            err = "Unbalanced quotes in configuration line";
            goto loaderr;
        }
 
        /* Skip this line if the resulting command vector is empty. */
        if (argc == 0) {
            sdsfreesplitres(argv,argc);
            continue;
        }
        sdstolower(argv[0]);
 
        /* Iterate the configs that are standard */
        int match = 0;
        for (standardConfig *config = configs; config->name != NULL; config++) {
            if ((!strcasecmp(argv[0],config->name) ||
                (config->alias && !strcasecmp(argv[0],config->alias))))
            {
                if (argc != 2) {
                    err = "wrong number of arguments";
                    goto loaderr;
                }
                if (!config->interface.set(config->data, argv[1], 0, &err)) {
                    goto loaderr;
                }
 
                match = 1;
                break;
            }
        }
 
        if (match) {
            sdsfreesplitres(argv,argc);
            continue;
        }
 
        /* Execute config directives */
        if (!strcasecmp(argv[0],"bind") && argc >= 2) {
            int j, addresses = argc-1;
 
            if (addresses > CONFIG_BINDADDR_MAX) {
                err = "Too many bind addresses specified"; goto loaderr;
            }
            /* Free old bind addresses */
            for (j = 0; j < server.bindaddr_count; j++) {
                zfree(server.bindaddr[j]);
            }
            for (j = 0; j < addresses; j++)
                server.bindaddr[j] = zstrdup(argv[j+1]);
            server.bindaddr_count = addresses;
        } else if (!strcasecmp(argv[0],"unixsocketperm") && argc == 2) {
            errno = 0;
            server.unixsocketperm = (mode_t)strtol(argv[1], NULL, 8);
            if (errno || server.unixsocketperm > 0777) {
                err = "Invalid socket file permissions"; goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"save")) {
            /* We don't reset save params before loading, because if they're not part
             * of the file the defaults should be used.
             */
            if (!save_loaded) {
                save_loaded = 1;
                resetServerSaveParams();
            }
 
            if (argc == 3) {
                int seconds = atoi(argv[1]);
                int changes = atoi(argv[2]);
                if (seconds < 1 || changes < 0) {
                    err = "Invalid save parameters"; goto loaderr;
                }
                appendServerSaveParams(seconds,changes);
            } else if (argc == 2 && !strcasecmp(argv[1],"")) {
                resetServerSaveParams();
            }
        } else if (!strcasecmp(argv[0],"dir") && argc == 2) {
            if (chdir(argv[1]) == -1) {
                serverLog(LL_WARNING,"Can't chdir to '%s': %s",
                    argv[1], strerror(errno));
                exit(1);
            }
        } else if (!strcasecmp(argv[0],"logfile") && argc == 2) {
            FILE *logfp;
 
            zfree(server.logfile);
            server.logfile = zstrdup(argv[1]);
            if (server.logfile[0] != '\0') {
                /* Test if we are able to open the file. The server will not
                 * be able to abort just for this problem later... */
                logfp = fopen(server.logfile,"a");
                if (logfp == NULL) {
                    err = sdscatprintf(sdsempty(),
                        "Can't open the log file: %s", strerror(errno));
                    goto loaderr;
                }
                fclose(logfp);
            }
        } else if (!strcasecmp(argv[0],"include") && argc == 2) {
            loadServerConfig(argv[1], 0, NULL);
        } else if ((!strcasecmp(argv[0],"slaveof") ||
                    !strcasecmp(argv[0],"replicaof")) && argc == 3) {
            slaveof_linenum = linenum;
            sdsfree(server.masterhost);
            if (!strcasecmp(argv[1], "no") && !strcasecmp(argv[2], "one")) {
                server.masterhost = NULL;
                continue;
            }
            server.masterhost = sdsnew(argv[1]);
            char *ptr;
            server.masterport = strtol(argv[2], &ptr, 10);
            if (server.masterport < 0 || server.masterport > 65535 || *ptr != '\0') {
                err = "Invalid master port"; goto loaderr;
            }
            server.repl_state = REPL_STATE_CONNECT;
        } else if (!strcasecmp(argv[0],"list-max-ziplist-entries") && argc == 2){
            /* DEAD OPTION */
        } else if (!strcasecmp(argv[0],"list-max-ziplist-value") && argc == 2) {
            /* DEAD OPTION */
        } else if (!strcasecmp(argv[0],"rename-command") && argc == 3) {
            struct redisCommand *cmd = lookupCommand(argv[1]);
            int retval;
 
            if (!cmd) {
                err = "No such command in rename-command";
                goto loaderr;
            }
 
            /* If the target command name is the empty string we just
             * remove it from the command table. */
            retval = dictDelete(server.commands, argv[1]);
            serverAssert(retval == DICT_OK);
 
            /* Otherwise we re-add the command under a different name. */
            if (sdslen(argv[2]) != 0) {
                sds copy = sdsdup(argv[2]);
 
                retval = dictAdd(server.commands, copy, cmd);
                if (retval != DICT_OK) {
                    sdsfree(copy);
                    err = "Target command name already exists"; goto loaderr;
                }
            }
        } else if (!strcasecmp(argv[0],"cluster-config-file") && argc == 2) {
            zfree(server.cluster_configfile);
            server.cluster_configfile = zstrdup(argv[1]);
        } else if (!strcasecmp(argv[0],"client-output-buffer-limit") &&
                   argc == 5)
        {
            int class = getClientTypeByName(argv[1]);
            unsigned long long hard, soft;
            int soft_seconds;
 
            if (class == -1 || class == CLIENT_TYPE_MASTER) {
                err = "Unrecognized client limit class: the user specified "
                "an invalid one, or 'master' which has no buffer limits.";
                goto loaderr;
            }
            hard = memtoll(argv[2],NULL);
            soft = memtoll(argv[3],NULL);
            soft_seconds = atoi(argv[4]);
            if (soft_seconds < 0) {
                err = "Negative number of seconds in soft limit is invalid";
                goto loaderr;
            }
            server.client_obuf_limits[class].hard_limit_bytes = hard;
            server.client_obuf_limits[class].soft_limit_bytes = soft;
            server.client_obuf_limits[class].soft_limit_seconds = soft_seconds;
        } else if (!strcasecmp(argv[0],"oom-score-adj-values") && argc == 1 + CONFIG_OOM_COUNT) {
            if (updateOOMScoreAdjValues(&argv[1], &err, 0) == C_ERR) goto loaderr;
        } else if (!strcasecmp(argv[0],"notify-keyspace-events") && argc == 2) {
            int flags = keyspaceEventsStringToFlags(argv[1]);
 
            if (flags == -1) {
                err = "Invalid event class character. Use 'g$lshzxeA'.";
                goto loaderr;
            }
            server.notify_keyspace_events = flags;
        } else if (!strcasecmp(argv[0],"user") && argc >= 2) {
            int argc_err;
            if (ACLAppendUserForLoading(argv,argc,&argc_err) == C_ERR) {
                char buf[1024];
                const char *errmsg = ACLSetUserStringError();
                snprintf(buf,sizeof(buf),"Error in user declaration '%s': %s",
                    argv[argc_err],errmsg);
                err = buf;
                goto loaderr;
            }
        } else if (!strcasecmp(argv[0],"loadmodule") && argc >= 2) {
            queueLoadModule(argv[1],&argv[2],argc-2);
        } else if (!strcasecmp(argv[0],"sentinel")) {
            /* argc == 1 is handled by main() as we need to enter the sentinel
             * mode ASAP. */
            if (argc != 1) {
                if (!server.sentinel_mode) {
                    err = "sentinel directive while not in sentinel mode";
                    goto loaderr;
                }
                queueSentinelConfig(argv+1,argc-1,linenum,lines[i]);
            }
        } else {
            err = "Bad directive or wrong number of arguments"; goto loaderr;
        }
        sdsfreesplitres(argv,argc);
    }
 
    /* Sanity checks. */
    if (server.cluster_enabled && server.masterhost) {
        linenum = slaveof_linenum;
        i = linenum-1;
        err = "replicaof directive not allowed in cluster mode";
        goto loaderr;
    }
 
    /* To ensure backward compatibility and work while hz is out of range */
    if (server.config_hz < CONFIG_MIN_HZ) server.config_hz = CONFIG_MIN_HZ;
    if (server.config_hz > CONFIG_MAX_HZ) server.config_hz = CONFIG_MAX_HZ;
 
    sdsfreesplitres(lines,totlines);
    return;
 
loaderr:
    fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR (Redis %s) ***\n",
        REDIS_VERSION);
    fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
    fprintf(stderr, ">>> '%s'\n", lines[i]);
    fprintf(stderr, "%s\n", err);
    exit(1);
}
 
/* Load the server configuration from the specified filename.
 * The function appends the additional configuration directives stored
 * in the 'options' string to the config file before loading.
 *
 * Both filename and options can be NULL, in such a case are considered
 * empty. This way loadServerConfig can be used to just load a file or
 * just load a string. */
void loadServerConfig(char *filename, char config_from_stdin, char *options) {
    sds config = sdsempty();
    char buf[CONFIG_MAX_LINE+1];
    FILE *fp;
 
    /* Load the file content */
    if (filename) {
        if ((fp = fopen(filename,"r")) == NULL) {
            serverLog(LL_WARNING,
                    "Fatal error, can't open config file '%s': %s",
                    filename, strerror(errno));
            exit(1);
        }
        while(fgets(buf,CONFIG_MAX_LINE+1,fp) != NULL)
            config = sdscat(config,buf);
        fclose(fp);
    }
    /* Append content from stdin */
    if (config_from_stdin) {
        serverLog(LL_WARNING,"Reading config from stdin");
        fp = stdin;
        while(fgets(buf,CONFIG_MAX_LINE+1,fp) != NULL)
            config = sdscat(config,buf);
    }
 
    /* Append the additional options */
    if (options) {
        config = sdscat(config,"\n");
        config = sdscat(config,options);
    }
    loadServerConfigFromString(config);
    sdsfree(config);
}