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Cetcd is a C client for etcd

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Status

cetcd is on active development. It aims to be used in production environment and to supply full features of etcd. Any issues or pull requests are welcome!

Features

  • Round-robin load balance and failover
  • Full support for etcd keys space apis
  • Multiple concurrent watchers support

Deps

cetcd use sds as a dynamic string utility. It is licensed in sds/LICENSE. sds is interaged in cetcd's source code, so you don't have to install it before.

yajl is a powerful json stream parsing libaray. We use the stream apis to parse response from cetcd. It is already integrated as a third-party dependency, so you are not necessary to install it before.

curl is required to issue HTTP requests in cetcd

Install

Install curl if needed on Ubuntu

apt-get install libcurl4-openssl-dev

or on CentOS

yum install libcurl-devel

then

make
make install

It default installs to /usr/local.

Use

make install prefix=/path

to specify your custom path.

Link

Use -lcetcd to link the library

Examples

Usage

cetcd_array is an expandable dynamic array. It is used to pass etcd cluster addresses, and return cetcd response nodes

Create an array to store the etcd addresses

    cetcd_array addrs;

    cetcd_array_init(&addrs, 3);
    cetcd_array_append(&addrs, "127.0.0.1:2379");
    cetcd_array_append(&addrs, "127.0.0.1:2378");
    cetcd_array_append(&addrs, "127.0.0.1:2377");

cetcd_client is a context cetcd uses to issue requests, you should init it with etcd addresses

Init the cetcd_client

    cetcd_client cli;
    cetcd_client_init(&cli, &addrs);

Then you can issue an cetcd request which reply with an cetcd response

Set a key

    cetcd_response *resp;
    resp = cetcd_set(&cli, "/service/redis", "hello cetcd", 0);
    if(resp->err) {
        printf("error :%d, %s (%s)\n", resp->err->ecode, resp->err->message, resp->err->cause);
    }
    cetcd_response_release(resp);

Get a key

    cetcd_response *resp;
    resp = cetcd_get(&cli, "/service/redis");
    if(resp->err) {
        printf("error :%d, %s (%s)\n", resp->err->ecode, resp->err->message, resp->err->cause);
    }
    cetcd_response_release(resp);

List a directory

    cetcd_response *resp;
    resp = cetcd_lsdir(&cli, "/service", 1, 1);
    if(resp->err) {
        printf("error :%d, %s (%s)\n", resp->err->ecode, resp->err->message, resp->err->cause);
    }
    cetcd_response_print(resp);
    cetcd_response_release(resp);

Clean all resources

    cetcd_array_destory(&addrs);
    cetcd_client_destroy(&cli);

See examples/cetcdget.c for more detailes

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Cetcd is a C client library for etcd with full features support

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