example/minimal/minimal.c

Shows how to connect to the cluster and perform operations.

Shows how to connect to the cluster and perform operations

/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *     Copyright 2012-2020 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.
 */
 
#include <stdio.h>
#include <libcouchbase/couchbase.h>
#include <stdlib.h>
#include <string.h> /* strlen */
#ifdef _WIN32
#define PRIx64 "I64x"
#else
#include <inttypes.h>
#endif
 
static void die(lcb_INSTANCE *instance, const char *msg, lcb_STATUS err)
{
    fprintf(stderr, "%s. Received code 0x%X (%s)\n", msg, err, lcb_strerror_short(err));
    exit(EXIT_FAILURE);
}
 
static void store_callback(lcb_INSTANCE *instance, int cbtype, const lcb_RESPSTORE *resp)
{
    lcb_STATUS rc = lcb_respstore_status(resp);
    fprintf(stderr, "=== %s ===\n", lcb_strcbtype(cbtype));
    if (rc == LCB_SUCCESS) {
        const char *key;
        size_t nkey;
        uint64_t cas;
        lcb_respstore_key(resp, &key, &nkey);
        fprintf(stderr, "KEY: %.*s\n", (int)nkey, key);
        lcb_respstore_cas(resp, &cas);
        fprintf(stderr, "CAS: 0x%" PRIx64 "\n", cas);
    } else {
        die(instance, lcb_strcbtype(cbtype), rc);
    }
}
 
static void get_callback(lcb_INSTANCE *instance, int cbtype, const lcb_RESPGET *resp)
{
    lcb_STATUS rc = lcb_respget_status(resp);
    fprintf(stderr, "=== %s ===\n", lcb_strcbtype(cbtype));
    if (rc == LCB_SUCCESS) {
        const char *key, *value;
        size_t nkey, nvalue;
        uint64_t cas;
        uint32_t flags;
        lcb_respget_key(resp, &key, &nkey);
        fprintf(stderr, "KEY: %.*s\n", (int)nkey, key);
        lcb_respget_cas(resp, &cas);
        fprintf(stderr, "CAS: 0x%" PRIx64 "\n", cas);
        lcb_respget_value(resp, &value, &nvalue);
        lcb_respget_flags(resp, &flags);
        fprintf(stderr, "VALUE: %.*s\n", (int)nvalue, value);
        fprintf(stderr, "FLAGS: 0x%x\n", flags);
    } else {
        die(instance, lcb_strcbtype(cbtype), rc);
    }
}
 
int main(int argc, char *argv[])
{
    lcb_STATUS err;
    lcb_INSTANCE *instance;
    lcb_CREATEOPTS *create_options = NULL;
    lcb_CMDSTORE *scmd;
    lcb_CMDGET *gcmd;
 
    if (argc < 2) {
        fprintf(stderr, "Usage: %s couchbase://host/bucket [ password [ username ] ]\n", argv[0]);
        exit(EXIT_FAILURE);
    }
 
    lcb_createopts_create(&create_options, LCB_TYPE_BUCKET);
    lcb_createopts_connstr(create_options, argv[1], strlen(argv[1]));
    if (argc > 3) {
        lcb_createopts_credentials(create_options, argv[2], strlen(argv[2]), argv[3], strlen(argv[3]));
    }
 
    err = lcb_create(&instance, create_options);
    lcb_createopts_destroy(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, LCB_WAIT_DEFAULT);
 
    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_callback(instance, LCB_CALLBACK_GET, (lcb_RESPCALLBACK)get_callback);
    lcb_install_callback(instance, LCB_CALLBACK_STORE, (lcb_RESPCALLBACK)store_callback);
 
    lcb_cmdstore_create(&scmd, LCB_STORE_UPSERT);
    lcb_cmdstore_key(scmd, "key", strlen("key"));
    lcb_cmdstore_value(scmd, "value", strlen("value"));
 
    err = lcb_store(instance, NULL, scmd);
    lcb_cmdstore_destroy(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, LCB_WAIT_DEFAULT);
 
    /* Now fetch the item back */
    lcb_cmdget_create(&gcmd);
    lcb_cmdget_key(gcmd, "key", strlen("key"));
    err = lcb_get(instance, NULL, gcmd);
    if (err != LCB_SUCCESS) {
        die(instance, "Couldn't schedule retrieval operation", err);
    }
    lcb_cmdget_destroy(gcmd);
 
    /* Likewise, the get_callback is invoked from here */
    fprintf(stderr, "Will wait to retrieve item..\n");
    lcb_wait(instance, LCB_WAIT_DEFAULT);
 
    /* Now that we're all done, close down the connection handle */
    lcb_destroy(instance);
    return 0;
}