gauc 0.3.0

Couchbase Rust Adapter / CLI
Documentation 
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *     Copyright 2012-2013 Couchbase, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

/**
 * @file
 *
 * This is a minimal example file showing how to connect to a cluster and
 * set and retrieve a single item.
 */

#include <stdio.h>
#include <libcouchbase/couchbase.h>
#include <libcouchbase/api3.h>
#include <stdlib.h>
#include <string.h> /* strlen */
#ifdef _WIN32
#define PRIx64 "I64x"
#else
#include <inttypes.h>
#endif

static void
die(lcb_t instance, const char *msg, lcb_error_t err)
{
    fprintf(stderr, "%s. Received code 0x%X (%s)\n",
        msg, err, lcb_strerror(instance, err));
    exit(EXIT_FAILURE);
}

static void
op_callback(lcb_t instance, int cbtype, const lcb_RESPBASE *rb)
{
    fprintf(stderr, "=== %s ===\n", lcb_strcbtype(cbtype));
    if (rb->rc == LCB_SUCCESS) {
        fprintf(stderr, "KEY: %.*s\n", (int)rb->nkey, rb->key);
        fprintf(stderr, "CAS: 0x%"PRIx64"\n", rb->cas);
        if (cbtype == LCB_CALLBACK_GET) {
            const lcb_RESPGET *rg = (const lcb_RESPGET *)rb;
            fprintf(stderr, "VALUE: %.*s\n", (int)rg->nvalue, rg->value);
            fprintf(stderr, "FLAGS: 0x%x\n", rg->itmflags);
        }
    } else {
        die(instance, lcb_strcbtype(rb->rc), rb->rc);
    }
    (void)instance;
}

int main(int argc, char *argv[])
{
    lcb_error_t err;
    lcb_t instance;
    struct lcb_create_st create_options = { 0 };
    lcb_CMDSTORE scmd = { 0 };
    lcb_CMDGET gcmd = { 0 };

    create_options.version = 3;

    if (argc < 2) {
        fprintf(stderr, "Usage: %s couchbase://host/bucket [ password ]\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    create_options.v.v3.connstr = argv[1];
    if (argc >= 3) {
        create_options.v.v3.passwd = argv[2];
    }

    err = lcb_create(&instance, &create_options);
    if (err != LCB_SUCCESS) {
        die(NULL, "Couldn't create couchbase handle", err);
    }

    err = lcb_connect(instance);
    if (err != LCB_SUCCESS) {
        die(instance, "Couldn't schedule connection", err);
    }

    lcb_wait(instance);

    err = lcb_get_bootstrap_status(instance);
    if (err != LCB_SUCCESS) {
        die(instance, "Couldn't bootstrap from cluster", err);
    }

    /* Assign the handlers to be called for the operation types */
    lcb_install_callback3(instance, LCB_CALLBACK_GET, op_callback);
    lcb_install_callback3(instance, LCB_CALLBACK_STORE, op_callback);

    LCB_CMD_SET_KEY(&scmd, "key", strlen("key"));
    LCB_CMD_SET_VALUE(&scmd, "value", strlen("value"));
    scmd.operation = LCB_SET;

    err = lcb_store3(instance, NULL, &scmd);
    if (err != LCB_SUCCESS) {
        die(instance, "Couldn't schedule storage operation", err);
    }

    /* The store_callback is invoked from lcb_wait() */
    fprintf(stderr, "Will wait for storage operation to complete..\n");
    lcb_wait(instance);

    /* Now fetch the item back */
    LCB_CMD_SET_KEY(&gcmd, "foo", strlen("foo"));
    err = lcb_get3(instance, NULL, &gcmd);
    if (err != LCB_SUCCESS) {
        die(instance, "Couldn't schedule retrieval operation", err);
    }

    /* Likewise, the get_callback is invoked from here */
    fprintf(stderr, "Will wait to retrieve item..\n");
    lcb_wait(instance);

    /* Now that we're all done, close down the connection handle */
    lcb_destroy(instance);
    return 0;
}