Store SELECTed database for reconnect (issue #468)

[redis.git] / src / redis-cli.c

/* Redis CLI (command line interface)
 *
 * Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Redis nor the names of its contributors may be used
 *     to endorse or promote products derived from this software without
 *     specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "fmacros.h"
#include "version.h"

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <assert.h>

#include "hiredis.h"
#include "sds.h"
#include "zmalloc.h"
#include "linenoise.h"
#include "help.h"

#define REDIS_NOTUSED(V) ((void) V)

static redisContext *context;
static struct config {
    char *hostip;
    int hostport;
    char *hostsocket;
    long repeat;
    int dbnum;
    int interactive;
    int shutdown;
    int monitor_mode;
    int pubsub_mode;
    int stdinarg; /* get last arg from stdin. (-x option) */
    char *auth;
    int raw_output; /* output mode per command */
    sds mb_delim;
} config;

static void usage();
char *redisGitSHA1(void);
char *redisGitDirty(void);

/*------------------------------------------------------------------------------
 * Utility functions
 *--------------------------------------------------------------------------- */

static long long mstime(void) {
    struct timeval tv;
    long long mst;

    gettimeofday(&tv, NULL);
    mst = ((long)tv.tv_sec)*1000;
    mst += tv.tv_usec/1000;
    return mst;
}

/*------------------------------------------------------------------------------
 * Help functions
 *--------------------------------------------------------------------------- */

#define CLI_HELP_COMMAND 1
#define CLI_HELP_GROUP 2

typedef struct {
    int type;
    int argc;
    sds *argv;
    sds full;

    /* Only used for help on commands */
    struct commandHelp *org;
} helpEntry;

static helpEntry *helpEntries;
static int helpEntriesLen;

static sds cliVersion() {
    sds version;
    version = sdscatprintf(sdsempty(), "%s", REDIS_VERSION);

    /* Add git commit and working tree status when available */
    if (strtoll(redisGitSHA1(),NULL,16)) {
        version = sdscatprintf(version, " (git:%s", redisGitSHA1());
        if (strtoll(redisGitDirty(),NULL,10))
            version = sdscatprintf(version, "-dirty");
        version = sdscat(version, ")");
    }
    return version;
}

static void cliInitHelp() {
    int commandslen = sizeof(commandHelp)/sizeof(struct commandHelp);
    int groupslen = sizeof(commandGroups)/sizeof(char*);
    int i, len, pos = 0;
    helpEntry tmp;

    helpEntriesLen = len = commandslen+groupslen;
    helpEntries = malloc(sizeof(helpEntry)*len);

    for (i = 0; i < groupslen; i++) {
        tmp.argc = 1;
        tmp.argv = malloc(sizeof(sds));
        tmp.argv[0] = sdscatprintf(sdsempty(),"@%s",commandGroups[i]);
        tmp.full = tmp.argv[0];
        tmp.type = CLI_HELP_GROUP;
        tmp.org = NULL;
        helpEntries[pos++] = tmp;
    }

    for (i = 0; i < commandslen; i++) {
        tmp.argv = sdssplitargs(commandHelp[i].name,&tmp.argc);
        tmp.full = sdsnew(commandHelp[i].name);
        tmp.type = CLI_HELP_COMMAND;
        tmp.org = &commandHelp[i];
        helpEntries[pos++] = tmp;
    }
}

/* Output command help to stdout. */
static void cliOutputCommandHelp(struct commandHelp *help, int group) {
    printf("\r\n  \x1b[1m%s\x1b[0m \x1b[90m%s\x1b[0m\r\n", help->name, help->params);
    printf("  \x1b[33msummary:\x1b[0m %s\r\n", help->summary);
    printf("  \x1b[33msince:\x1b[0m %s\r\n", help->since);
    if (group) {
        printf("  \x1b[33mgroup:\x1b[0m %s\r\n", commandGroups[help->group]);
    }
}

/* Print generic help. */
static void cliOutputGenericHelp() {
    sds version = cliVersion();
    printf(
        "redis-cli %s\r\n"
        "Type: \"help @<group>\" to get a list of commands in <group>\r\n"
        "      \"help <command>\" for help on <command>\r\n"
        "      \"help <tab>\" to get a list of possible help topics\r\n"
        "      \"quit\" to exit\r\n",
        version
    );
    sdsfree(version);
}

/* Output all command help, filtering by group or command name. */
static void cliOutputHelp(int argc, char **argv) {
    int i, j, len;
    int group = -1;
    helpEntry *entry;
    struct commandHelp *help;

    if (argc == 0) {
        cliOutputGenericHelp();
        return;
    } else if (argc > 0 && argv[0][0] == '@') {
        len = sizeof(commandGroups)/sizeof(char*);
        for (i = 0; i < len; i++) {
            if (strcasecmp(argv[0]+1,commandGroups[i]) == 0) {
                group = i;
                break;
            }
        }
    }

    assert(argc > 0);
    for (i = 0; i < helpEntriesLen; i++) {
        entry = &helpEntries[i];
        if (entry->type != CLI_HELP_COMMAND) continue;

        help = entry->org;
        if (group == -1) {
            /* Compare all arguments */
            if (argc == entry->argc) {
                for (j = 0; j < argc; j++) {
                    if (strcasecmp(argv[j],entry->argv[j]) != 0) break;
                }
                if (j == argc) {
                    cliOutputCommandHelp(help,1);
                }
            }
        } else {
            if (group == help->group) {
                cliOutputCommandHelp(help,0);
            }
        }
    }
    printf("\r\n");
}

static void completionCallback(const char *buf, linenoiseCompletions *lc) {
    size_t startpos = 0;
    int mask;
    int i;
    size_t matchlen;
    sds tmp;

    if (strncasecmp(buf,"help ",5) == 0) {
        startpos = 5;
        while (isspace(buf[startpos])) startpos++;
        mask = CLI_HELP_COMMAND | CLI_HELP_GROUP;
    } else {
        mask = CLI_HELP_COMMAND;
    }

    for (i = 0; i < helpEntriesLen; i++) {
        if (!(helpEntries[i].type & mask)) continue;

        matchlen = strlen(buf+startpos);
        if (strncasecmp(buf+startpos,helpEntries[i].full,matchlen) == 0) {
            tmp = sdsnewlen(buf,startpos);
            tmp = sdscat(tmp,helpEntries[i].full);
            linenoiseAddCompletion(lc,tmp);
            sdsfree(tmp);
        }
    }
}

/*------------------------------------------------------------------------------
 * Networking / parsing
 *--------------------------------------------------------------------------- */

/* Send AUTH command to the server */
static int cliAuth() {
    redisReply *reply;
    if (config.auth == NULL) return REDIS_OK;

    reply = redisCommand(context,"AUTH %s",config.auth);
    if (reply != NULL) {
        freeReplyObject(reply);
        return REDIS_OK;
    }
    return REDIS_ERR;
}

/* Send SELECT dbnum to the server */
static int cliSelect() {
    redisReply *reply;
    if (config.dbnum == 0) return REDIS_OK;

    reply = redisCommand(context,"SELECT %d",config.dbnum);
    if (reply != NULL) {
        freeReplyObject(reply);
        return REDIS_OK;
    }
    return REDIS_ERR;
}

/* Connect to the client. If force is not zero the connection is performed
 * even if there is already a connected socket. */
static int cliConnect(int force) {
    if (context == NULL || force) {
        if (context != NULL)
            redisFree(context);

        if (config.hostsocket == NULL) {
            context = redisConnect(config.hostip,config.hostport);
        } else {
            context = redisConnectUnix(config.hostsocket);
        }

        if (context->err) {
            fprintf(stderr,"Could not connect to Redis at ");
            if (config.hostsocket == NULL)
                fprintf(stderr,"%s:%d: %s\n",config.hostip,config.hostport,context->errstr);
            else
                fprintf(stderr,"%s: %s\n",config.hostsocket,context->errstr);
            redisFree(context);
            context = NULL;
            return REDIS_ERR;
        }

        /* Do AUTH and select the right DB. */
        if (cliAuth() != REDIS_OK)
            return REDIS_ERR;
        if (cliSelect() != REDIS_OK)
            return REDIS_ERR;
    }
    return REDIS_OK;
}

static void cliPrintContextErrorAndExit() {
    if (context == NULL) return;
    fprintf(stderr,"Error: %s\n",context->errstr);
    exit(1);
}

static sds cliFormatReplyTTY(redisReply *r, char *prefix) {
    sds out = sdsempty();
    switch (r->type) {
    case REDIS_REPLY_ERROR:
        out = sdscatprintf(out,"(error) %s\n", r->str);
    break;
    case REDIS_REPLY_STATUS:
        out = sdscat(out,r->str);
        out = sdscat(out,"\n");
    break;
    case REDIS_REPLY_INTEGER:
        out = sdscatprintf(out,"(integer) %lld\n",r->integer);
    break;
    case REDIS_REPLY_STRING:
        /* If you are producing output for the standard output we want
        * a more interesting output with quoted characters and so forth */
        out = sdscatrepr(out,r->str,r->len);
        out = sdscat(out,"\n");
    break;
    case REDIS_REPLY_NIL:
        out = sdscat(out,"(nil)\n");
    break;
    case REDIS_REPLY_ARRAY:
        if (r->elements == 0) {
            out = sdscat(out,"(empty list or set)\n");
        } else {
            unsigned int i, idxlen = 0;
            char _prefixlen[16];
            char _prefixfmt[16];
            sds _prefix;
            sds tmp;

            /* Calculate chars needed to represent the largest index */
            i = r->elements;
            do {
                idxlen++;
                i /= 10;
            } while(i);

            /* Prefix for nested multi bulks should grow with idxlen+2 spaces */
            memset(_prefixlen,' ',idxlen+2);
            _prefixlen[idxlen+2] = '\0';
            _prefix = sdscat(sdsnew(prefix),_prefixlen);

            /* Setup prefix format for every entry */
            snprintf(_prefixfmt,sizeof(_prefixfmt),"%%s%%%dd) ",idxlen);

            for (i = 0; i < r->elements; i++) {
                /* Don't use the prefix for the first element, as the parent
                 * caller already prepended the index number. */
                out = sdscatprintf(out,_prefixfmt,i == 0 ? "" : prefix,i+1);

                /* Format the multi bulk entry */
                tmp = cliFormatReplyTTY(r->element[i],_prefix);
                out = sdscatlen(out,tmp,sdslen(tmp));
                sdsfree(tmp);
            }
            sdsfree(_prefix);
        }
    break;
    default:
        fprintf(stderr,"Unknown reply type: %d\n", r->type);
        exit(1);
    }
    return out;
}

static sds cliFormatReplyRaw(redisReply *r) {
    sds out = sdsempty(), tmp;
    size_t i;

    switch (r->type) {
    case REDIS_REPLY_NIL:
        /* Nothing... */
    break;
    case REDIS_REPLY_ERROR:
    case REDIS_REPLY_STATUS:
    case REDIS_REPLY_STRING:
        out = sdscatlen(out,r->str,r->len);
    break;
    case REDIS_REPLY_INTEGER:
        out = sdscatprintf(out,"%lld",r->integer);
    break;
    case REDIS_REPLY_ARRAY:
        for (i = 0; i < r->elements; i++) {
            if (i > 0) out = sdscat(out,config.mb_delim);
            tmp = cliFormatReplyRaw(r->element[i]);
            out = sdscatlen(out,tmp,sdslen(tmp));
            sdsfree(tmp);
        }
    break;
    default:
        fprintf(stderr,"Unknown reply type: %d\n", r->type);
        exit(1);
    }
    return out;
}

static int cliReadReply(int output_raw_strings) {
    void *_reply;
    redisReply *reply;
    sds out;

    if (redisGetReply(context,&_reply) != REDIS_OK) {
        if (config.shutdown)
            return REDIS_OK;
        if (config.interactive) {
            /* Filter cases where we should reconnect */
            if (context->err == REDIS_ERR_IO && errno == ECONNRESET)
                return REDIS_ERR;
            if (context->err == REDIS_ERR_EOF)
                return REDIS_ERR;
        }
        cliPrintContextErrorAndExit();
        return REDIS_ERR; /* avoid compiler warning */
    }

    reply = (redisReply*)_reply;
    if (output_raw_strings) {
        out = cliFormatReplyRaw(reply);
    } else {
        if (config.raw_output) {
            out = cliFormatReplyRaw(reply);
            out = sdscat(out,"\n");
        } else {
            out = cliFormatReplyTTY(reply,"");
        }
    }
    fwrite(out,sdslen(out),1,stdout);
    sdsfree(out);
    freeReplyObject(reply);
    return REDIS_OK;
}

static int cliSendCommand(int argc, char **argv, int repeat) {
    char *command = argv[0];
    size_t *argvlen;
    int j, output_raw;

    if (context == NULL) {
        printf("Not connected, please use: connect <host> <port>\n");
        return REDIS_OK;
    }

    output_raw = !strcasecmp(command,"info");
    if (!strcasecmp(command,"help") || !strcasecmp(command,"?")) {
        cliOutputHelp(--argc, ++argv);
        return REDIS_OK;
    }
    if (!strcasecmp(command,"shutdown")) config.shutdown = 1;
    if (!strcasecmp(command,"monitor")) config.monitor_mode = 1;
    if (!strcasecmp(command,"subscribe") ||
        !strcasecmp(command,"psubscribe")) config.pubsub_mode = 1;

    /* Setup argument length */
    argvlen = malloc(argc*sizeof(size_t));
    for (j = 0; j < argc; j++)
        argvlen[j] = sdslen(argv[j]);

    while(repeat--) {
        redisAppendCommandArgv(context,argc,(const char**)argv,argvlen);
        while (config.monitor_mode) {
            if (cliReadReply(output_raw) != REDIS_OK) exit(1);
            fflush(stdout);
        }

        if (config.pubsub_mode) {
            if (!config.raw_output)
                printf("Reading messages... (press Ctrl-C to quit)\n");
            while (1) {
                if (cliReadReply(output_raw) != REDIS_OK) exit(1);
            }
        }

        if (cliReadReply(output_raw) != REDIS_OK) {
            free(argvlen);
            return REDIS_ERR;
        } else {
            /* Store database number when SELECT was successfully executed. */
            if (!strcasecmp(command,"select") && argc == 2)
                config.dbnum = atoi(argv[1]);
        }
    }

    free(argvlen);
    return REDIS_OK;
}

/*------------------------------------------------------------------------------
 * User interface
 *--------------------------------------------------------------------------- */

static int parseOptions(int argc, char **argv) {
    int i;

    for (i = 1; i < argc; i++) {
        int lastarg = i==argc-1;

        if (!strcmp(argv[i],"-h") && !lastarg) {
            sdsfree(config.hostip);
            config.hostip = sdsnew(argv[i+1]);
            i++;
        } else if (!strcmp(argv[i],"-h") && lastarg) {
            usage();
        } else if (!strcmp(argv[i],"--help")) {
            usage();
        } else if (!strcmp(argv[i],"-x")) {
            config.stdinarg = 1;
        } else if (!strcmp(argv[i],"-p") && !lastarg) {
            config.hostport = atoi(argv[i+1]);
            i++;
        } else if (!strcmp(argv[i],"-s") && !lastarg) {
            config.hostsocket = argv[i+1];
            i++;
        } else if (!strcmp(argv[i],"-r") && !lastarg) {
            config.repeat = strtoll(argv[i+1],NULL,10);
            i++;
        } else if (!strcmp(argv[i],"-n") && !lastarg) {
            config.dbnum = atoi(argv[i+1]);
            i++;
        } else if (!strcmp(argv[i],"-a") && !lastarg) {
            config.auth = argv[i+1];
            i++;
        } else if (!strcmp(argv[i],"--raw")) {
            config.raw_output = 1;
        } else if (!strcmp(argv[i],"-d") && !lastarg) {
            sdsfree(config.mb_delim);
            config.mb_delim = sdsnew(argv[i+1]);
            i++;
        } else if (!strcmp(argv[i],"-v") || !strcmp(argv[i], "--version")) {
            sds version = cliVersion();
            printf("redis-cli %s\n", version);
            sdsfree(version);
            exit(0);
        } else {
            break;
        }
    }
    return i;
}

static sds readArgFromStdin(void) {
    char buf[1024];
    sds arg = sdsempty();

    while(1) {
        int nread = read(fileno(stdin),buf,1024);

        if (nread == 0) break;
        else if (nread == -1) {
            perror("Reading from standard input");
            exit(1);
        }
        arg = sdscatlen(arg,buf,nread);
    }
    return arg;
}

static void usage() {
    sds version = cliVersion();
    fprintf(stderr,
"redis-cli %s\n"
"\n"
"Usage: redis-cli [OPTIONS] [cmd [arg [arg ...]]]\n"
"  -h <hostname>    Server hostname (default: 127.0.0.1)\n"
"  -p <port>        Server port (default: 6379)\n"
"  -s <socket>      Server socket (overrides hostname and port)\n"
"  -a <password>    Password to use when connecting to the server\n"
"  -r <repeat>      Execute specified command N times\n"
"  -n <db>          Database number\n"
"  -x               Read last argument from STDIN\n"
"  -d <delimiter>   Multi-bulk delimiter in for raw formatting (default: \\n)\n"
"  --raw            Use raw formatting for replies (default when STDOUT is not a tty)\n"
"  --help           Output this help and exit\n"
"  --version        Output version and exit\n"
"\n"
"Examples:\n"
"  cat /etc/passwd | redis-cli -x set mypasswd\n"
"  redis-cli get mypasswd\n"
"  redis-cli -r 100 lpush mylist x\n"
"\n"
"When no command is given, redis-cli starts in interactive mode.\n"
"Type \"help\" in interactive mode for information on available commands.\n"
"\n",
        version);
    sdsfree(version);
    exit(1);
}

/* Turn the plain C strings into Sds strings */
static char **convertToSds(int count, char** args) {
  int j;
  char **sds = zmalloc(sizeof(char*)*count);

  for(j = 0; j < count; j++)
    sds[j] = sdsnew(args[j]);

  return sds;
}

#define LINE_BUFLEN 4096
static void repl() {
    sds historyfile = NULL;
    int history = 0;
    char *line;
    int argc;
    sds *argv;

    config.interactive = 1;
    linenoiseSetCompletionCallback(completionCallback);

    /* Only use history when stdin is a tty. */
    if (isatty(fileno(stdin))) {
        history = 1;

        if (getenv("HOME") != NULL) {
            historyfile = sdscatprintf(sdsempty(),"%s/.rediscli_history",getenv("HOME"));
            linenoiseHistoryLoad(historyfile);
        }
    }

    while((line = linenoise(context ? "redis> " : "not connected> ")) != NULL) {
        if (line[0] != '\0') {
            argv = sdssplitargs(line,&argc);
            if (history) linenoiseHistoryAdd(line);
            if (historyfile) linenoiseHistorySave(historyfile);

            if (argv == NULL) {
                printf("Invalid argument(s)\n");
                continue;
            } else if (argc > 0) {
                if (strcasecmp(argv[0],"quit") == 0 ||
                    strcasecmp(argv[0],"exit") == 0)
                {
                    exit(0);
                } else if (argc == 3 && !strcasecmp(argv[0],"connect")) {
                    sdsfree(config.hostip);
                    config.hostip = sdsnew(argv[1]);
                    config.hostport = atoi(argv[2]);
                    cliConnect(1);
                } else if (argc == 1 && !strcasecmp(argv[0],"clear")) {
                    linenoiseClearScreen();
                } else {
                    long long start_time = mstime(), elapsed;

                    if (cliSendCommand(argc,argv,1) != REDIS_OK) {
                        cliConnect(1);

                        /* If we still cannot send the command,
                         * print error and abort. */
                        if (cliSendCommand(argc,argv,1) != REDIS_OK)
                            cliPrintContextErrorAndExit();
                    }
                    elapsed = mstime()-start_time;
                    if (elapsed >= 500) {
                        printf("(%.2fs)\n",(double)elapsed/1000);
                    }
                }
            }
            /* Free the argument vector */
            while(argc--) sdsfree(argv[argc]);
            zfree(argv);
        }
        /* linenoise() returns malloc-ed lines like readline() */
        free(line);
    }
    exit(0);
}

static int noninteractive(int argc, char **argv) {
    int retval = 0;
    if (config.stdinarg) {
        argv = zrealloc(argv, (argc+1)*sizeof(char*));
        argv[argc] = readArgFromStdin();
        retval = cliSendCommand(argc+1, argv, config.repeat);
    } else {
        /* stdin is probably a tty, can be tested with S_ISCHR(s.st_mode) */
        retval = cliSendCommand(argc, argv, config.repeat);
    }
    return retval;
}

int main(int argc, char **argv) {
    int firstarg;

    config.hostip = sdsnew("127.0.0.1");
    config.hostport = 6379;
    config.hostsocket = NULL;
    config.repeat = 1;
    config.dbnum = 0;
    config.interactive = 0;
    config.shutdown = 0;
    config.monitor_mode = 0;
    config.pubsub_mode = 0;
    config.stdinarg = 0;
    config.auth = NULL;
    config.raw_output = !isatty(fileno(stdout)) && (getenv("FAKETTY") == NULL);
    config.mb_delim = sdsnew("\n");
    cliInitHelp();

    firstarg = parseOptions(argc,argv);
    argc -= firstarg;
    argv += firstarg;

    /* Try to connect */
    if (cliConnect(0) != REDIS_OK) exit(1);

    /* Start interactive mode when no command is provided */
    if (argc == 0) repl();
    /* Otherwise, we have some arguments to execute */
    return noninteractive(argc,convertToSds(argc,argv));
}