Refactor help-related code into redis-cli.c

[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 "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 raw_output; /* output mode per command */
    int tty; /* flag for default output format */
    int stdinarg; /* get last arg from stdin. (-x option) */
    char mb_sep;
    char *auth;
    char *historyfile;
} config;

static void usage();
char *redisGitSHA1(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
 *--------------------------------------------------------------------------- */

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

/* Return command group type by name string. */
static int commandGroupIndex(const char *name) {
    int i, len = sizeof(commandGroups)/sizeof(char*);
    for (i = 0; i < len; i++)
        if (strcasecmp(name, commandGroups[i]) == 0)
            return i;
    return -1;
}

/* Output group names. */
static void outputGroupHelp() {
    int i, len = sizeof(commandGroups)/sizeof(char*);
    for (i = 0; i < len; i++)
        printf("  \x1b[90m-\x1b[0m %s\n", commandGroups[i]);
}

/* Output all command help, filtering by group or command name. */
static void outputHelp(int argc, char **argv) {
    int i, len = sizeof(commandHelp) / sizeof(struct commandHelp);
    int group;
    struct commandHelp *help;

    if (argc && strcasecmp("groups", argv[0]) == 0) {
        outputGroupHelp();
        return;
    }

    group = argc ? commandGroupIndex(argv[0]) : -1;
    for (i = 0; i < len; i++) {
        help = &commandHelp[i];
        if (group == -1) {
            if (argc) {
                if (strcasecmp(help->name, argv[0]) == 0) {
                    outputCommandHelp(help);
                }
            } else {
                outputCommandHelp(help);
            }
        } else {
            if (group == help->group) {
                outputCommandHelp(help);
            }
        }
    }
    puts("");
}

/*------------------------------------------------------------------------------
 * 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;
    char dbnum[16];
    if (config.dbnum == 0) return REDIS_OK;

    snprintf(dbnum,sizeof(dbnum),"%d",config.dbnum);
    reply = redisCommand(context,"SELECT %s",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 cliFormatReply(redisReply *r, char *prefix) {
    sds out = sdsempty();
    switch (r->type) {
    case REDIS_REPLY_ERROR:
        if (config.tty) out = sdscat(out,"(error) ");
        out = sdscatprintf(out,"%s\n", r->str);
    break;
    case REDIS_REPLY_STATUS:
        out = sdscat(out,r->str);
        out = sdscat(out,"\n");
    break;
    case REDIS_REPLY_INTEGER:
        if (config.tty) out = sdscat(out,"(integer) ");
        out = sdscatprintf(out,"%lld\n",r->integer);
    break;
    case REDIS_REPLY_STRING:
        if (config.raw_output || !config.tty) {
            out = sdscatlen(out,r->str,r->len);
        } else {
            /* 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 = cliFormatReply(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 int cliReadReply() {
    redisReply *reply;
    sds out;

    if (redisGetReply(context,(void**)&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 */
    }

    out = cliFormatReply(reply,"");
    freeReplyObject(reply);
    fwrite(out,sdslen(out),1,stdout);
    sdsfree(out);
    return REDIS_OK;
}

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

    config.raw_output = !strcasecmp(command,"info");
    if (!strcasecmp(command,"help")) {
        outputHelp(--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() != REDIS_OK) exit(1);
            fflush(stdout);
        }

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

        if (cliReadReply() != REDIS_OK)
            return REDIS_ERR;
    }
    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) {
            config.hostip = argv[i+1];
            i++;
        } else if (!strcmp(argv[i],"-h") && lastarg) {
            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],"-i")) {
            fprintf(stderr,
"Starting interactive mode using -i is deprecated. Interactive mode is started\n"
"by default when redis-cli is executed without a command to execute.\n"
            );
        } else if (!strcmp(argv[i],"-c")) {
            fprintf(stderr,
"Reading last argument from standard input using -c is deprecated.\n"
"When standard input is connected to a pipe or regular file, it is\n"
"automatically used as last argument.\n"
            );
        } else if (!strcmp(argv[i],"-v")) {
            printf("redis-cli shipped with Redis version %s (%s)\n", REDIS_VERSION, redisGitSHA1());
            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() {
    fprintf(stderr, "usage: redis-cli [-iv] [-h host] [-p port] [-s /path/to/socket] [-a authpw] [-r repeat_times] [-n db_num] cmd arg1 arg2 arg3 ... argN\n");
    fprintf(stderr, "usage: echo \"argN\" | redis-cli -x [options] cmd arg1 arg2 ... arg(N-1)\n\n");
    fprintf(stderr, "example: cat /etc/passwd | redis-cli -x set my_passwd\n");
    fprintf(stderr, "example: redis-cli get my_passwd\n");
    fprintf(stderr, "example: redis-cli -r 100 lpush mylist x\n");
    fprintf(stderr, "\nRun in interactive mode: redis-cli -i or just don't pass any command\n");
    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() {
    int argc, j;
    char *line;
    sds *argv;

    config.interactive = 1;
    while((line = linenoise("redis> ")) != NULL) {
        if (line[0] != '\0') {
            argv = sdssplitargs(line,&argc);
            linenoiseHistoryAdd(line);
            if (config.historyfile) linenoiseHistorySave(config.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 {
                    long long start_time = mstime(), elapsed;

                    if (cliSendCommand(argc,argv,1) != REDIS_OK) {
                        printf("Reconnecting... ");
                        fflush(stdout);
                        if (cliConnect(1) != REDIS_OK) exit(1);
                        printf("OK\n");

                        /* 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 */
            for (j = 0; j < argc; j++)
                sdsfree(argv[j]);
            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 = "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.raw_output = 0;
    config.stdinarg = 0;
    config.auth = NULL;
    config.historyfile = NULL;
    config.tty = isatty(fileno(stdout)) || (getenv("FAKETTY") != NULL);
    config.mb_sep = '\n';

    if (getenv("HOME") != NULL) {
        config.historyfile = malloc(256);
        snprintf(config.historyfile,256,"%s/.rediscli_history",getenv("HOME"));
        linenoiseHistoryLoad(config.historyfile);
    }

    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));
}