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cetcd.c
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cetcd.c
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#include "cetcd.h"
#include "cetcd_json_parser.h"
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <curl/curl.h>
#include <yajl/yajl_parse.h>
#include <sys/select.h>
#include <pthread.h>
enum ETCD_API_TYPE {
ETCD_KEYS,
ETCD_MEMBERS
};
typedef struct cetcd_request_t {
enum HTTP_METHOD method;
enum ETCD_API_TYPE api_type;
cetcd_string uri;
cetcd_string url;
cetcd_string data;
cetcd_client *cli;
} cetcd_request;
static const char *http_method[] = {
"GET",
"POST",
"PUT",
"DELETE",
"HEAD",
"OPTION"
};
typedef struct cetcd_response_parser_t {
int st;
int http_status;
enum ETCD_API_TYPE api_type;
cetcd_string buf;
void *resp;
yajl_parser_context ctx;
yajl_handle json;
}cetcd_response_parser;
static const char *cetcd_event_action[] = {
"set",
"get",
"update",
"create",
"delete",
"expire",
"compareAndSwap",
"compareAndDelete"
};
void *cetcd_cluster_request(cetcd_client *cli, cetcd_request *req);
int cetcd_curl_setopt(CURL *curl, cetcd_watcher *watcher);
void cetcd_client_init(cetcd_client *cli, cetcd_array *addresses) {
size_t i;
cetcd_array *addrs;
cetcd_string addr;
curl_global_init(CURL_GLOBAL_ALL);
srand(time(0));
cli->keys_space = "v2/keys";
cli->stat_space = "v2/stat";
cli->member_space = "v2/members";
cli->curl = curl_easy_init();
addrs = cetcd_array_create(cetcd_array_size(addresses));
for (i=0; i<cetcd_array_size(addresses); ++i) {
addr = cetcd_array_get(addresses, i);
if ( strncmp(addr, "http", 4)) {
cetcd_array_append(addrs, sdscatprintf(sdsempty(), "http://%s", addr));
} else {
cetcd_array_append(addrs, sdsnew(addr));
}
}
cli->addresses = cetcd_array_shuffle(addrs);
cli->picked = rand() % (cetcd_array_size(cli->addresses));
cli->settings.verbose = 0;
cli->settings.connect_timeout = 1;
cli->settings.read_timeout = 1; /*not used now*/
cli->settings.write_timeout = 1; /*not used now*/
cli->settings.user = NULL;
cli->settings.password = NULL;
cetcd_array_init(&cli->watchers, 10);
/* Set CURLOPT_NOSIGNAL to 1 to work around the libcurl bug:
* http://stackoverflow.com/questions/9191668/error-longjmp-causes-uninitialized-stack-frame
* http://curl.haxx.se/mail/lib-2008-09/0197.html
* */
curl_easy_setopt(cli->curl, CURLOPT_NOSIGNAL, 1L);
#if LIBCURL_VERSION_NUM >= 0x071900
curl_easy_setopt(cli->curl, CURLOPT_TCP_KEEPALIVE, 1L);
curl_easy_setopt(cli->curl, CURLOPT_TCP_KEEPINTVL, 1L); /*the same as go-etcd*/
#endif
curl_easy_setopt(cli->curl, CURLOPT_USERAGENT, "cetcd");
curl_easy_setopt(cli->curl, CURLOPT_POSTREDIR, 3L); /*post after redirecting*/
curl_easy_setopt(cli->curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
}
cetcd_client *cetcd_client_create(cetcd_array *addresses){
cetcd_client *cli;
cli = calloc(1, sizeof(cetcd_client));
cetcd_client_init(cli, addresses);
return cli;
}
void cetcd_client_destroy(cetcd_client *cli) {
cetcd_addresses_release(cli->addresses);
cetcd_array_release(cli->addresses);
sdsfree(cli->settings.user);
sdsfree(cli->settings.password);
curl_easy_cleanup(cli->curl);
curl_global_cleanup();
cetcd_array_destroy(&cli->watchers);
}
void cetcd_client_release(cetcd_client *cli){
if (cli) {
cetcd_client_destroy(cli);
free(cli);
}
}
void cetcd_addresses_release(cetcd_array *addrs){
int count, i;
cetcd_string s;
if (addrs) {
count = cetcd_array_size(addrs);
for (i = 0; i < count; ++i) {
s = cetcd_array_get(addrs, i);
sdsfree(s);
}
}
}
void cetcd_client_sync_cluster(cetcd_client *cli){
cetcd_request req;
cetcd_array *addrs;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_GET;
req.api_type = ETCD_MEMBERS;
req.uri = sdscatprintf(sdsempty(), "%s", cli->member_space);
addrs = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
if (addrs == NULL) {
return ;
}
cetcd_addresses_release(cli->addresses);
cetcd_array_release(cli->addresses);
cli->addresses = cetcd_array_shuffle(addrs);
cli->picked = rand() % (cetcd_array_size(cli->addresses));
}
void cetcd_setup_user(cetcd_client *cli, const char* user, const char* password)
{
if (user != NULL) {
cli->settings.user = sdsnew(user);
}
if (password !=NULL) {
cli->settings.password = sdsnew(password);
}
}
void cetcd_setup_tls(cetcd_client *cli, const char *CA, const char *cert, const char *key) {
if (CA) {
curl_easy_setopt(cli->curl, CURLOPT_CAINFO, CA);
}
if (cert) {
curl_easy_setopt(cli->curl, CURLOPT_SSLCERT, cert);
}
if (key) {
curl_easy_setopt(cli->curl, CURLOPT_SSLKEY, key);
}
}
size_t cetcd_parse_response(char *ptr, size_t size, size_t nmemb, void *userdata);
cetcd_watcher *cetcd_watcher_create(cetcd_client *cli, const char *key, uint64_t index,
int recursive, int once, cetcd_watcher_callback callback, void *userdata) {
cetcd_watcher *watcher;
watcher = calloc(1, sizeof(cetcd_watcher));
watcher->cli = cli;
watcher->key = sdsnew(key);
watcher->index = index;
watcher->recursive = recursive;
watcher->once = once;
watcher->callback = callback;
watcher->userdata = userdata;
watcher->curl = curl_easy_init();
watcher->parser = calloc(1, sizeof(cetcd_response_parser));
watcher->parser->st = 0;
watcher->parser->buf = sdsempty();
watcher->parser->resp = calloc(1, sizeof(cetcd_response));
watcher->array_index = -1;
return watcher;
}
void cetcd_watcher_release(cetcd_watcher *watcher) {
if (watcher) {
if (watcher->key) {
sdsfree(watcher->key);
}
if (watcher->curl) {
curl_easy_cleanup(watcher->curl);
}
if (watcher->parser) {
sdsfree(watcher->parser->buf);
if (watcher->parser->json) {
yajl_free(watcher->parser->json);
cetcd_array_destroy(&watcher->parser->ctx.keystack);
cetcd_array_destroy(&watcher->parser->ctx.nodestack);
}
cetcd_response_release(watcher->parser->resp);
free(watcher->parser);
}
free(watcher);
}
}
/*reset the temp resource one time watching used*/
void cetcd_watcher_reset(cetcd_watcher *watcher) {
if (!watcher){
return;
}
/*reset the curl handler*/
curl_easy_reset(watcher->curl);
cetcd_curl_setopt(watcher->curl, watcher);
if (watcher->parser) {
watcher->parser->st = 0;
/*allocate the resp, because it is freed after calling the callback*/
watcher->parser->resp = calloc(1, sizeof(cetcd_response));
/*clear the buf, it is allocated by cetcd_watcher_create,
* so should only be freed in cetcd_watcher_release*/
sdsclear(watcher->parser->buf);
/*the json object created by cetcd_parse_response, so it should be freed
* after having got some response*/
if (watcher->parser->json) {
yajl_free(watcher->parser->json);
cetcd_array_destroy(&watcher->parser->ctx.keystack);
cetcd_array_destroy(&watcher->parser->ctx.nodestack);
watcher->parser->json = NULL;
}
}
}
static cetcd_string cetcd_watcher_build_url(cetcd_client *cli, cetcd_watcher *watcher) {
cetcd_string url;
url = sdscatprintf(sdsempty(), "%s/%s%s?wait=true", (cetcd_string)cetcd_array_get(cli->addresses, cli->picked),
cli->keys_space, watcher->key);
if (watcher->index) {
url = sdscatprintf(url, "&waitIndex=%lu", watcher->index);
}
if (watcher->recursive) {
url = sdscatprintf(url, "&recursive=true");
}
return url;
}
int cetcd_curl_setopt(CURL *curl, cetcd_watcher *watcher) {
cetcd_string url;
url = cetcd_watcher_build_url(watcher->cli, watcher);
curl_easy_setopt(curl,CURLOPT_URL, url);
sdsfree(url);
/* See above about CURLOPT_NOSIGNAL
* */
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, watcher->cli->settings.connect_timeout);
#if LIBCURL_VERSION_NUM >= 0x071900
curl_easy_setopt(watcher->curl, CURLOPT_TCP_KEEPALIVE, 1L);
curl_easy_setopt(watcher->curl, CURLOPT_TCP_KEEPINTVL, 1L); /*the same as go-etcd*/
#endif
curl_easy_setopt(curl, CURLOPT_USERAGENT, "cetcd");
curl_easy_setopt(curl, CURLOPT_POSTREDIR, 3L); /*post after redirecting*/
curl_easy_setopt(curl, CURLOPT_VERBOSE, watcher->cli->settings.verbose);
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "GET");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, cetcd_parse_response);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, watcher->parser);
curl_easy_setopt(curl, CURLOPT_HEADER, 1L);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl, CURLOPT_PRIVATE, watcher);
watcher->curl = curl;
return 1;
}
int cetcd_add_watcher(cetcd_array *watchers, cetcd_watcher *watcher) {
cetcd_watcher *w;
cetcd_curl_setopt(watcher->curl, watcher);
watcher->attempts = cetcd_array_size(watcher->cli->addresses);
/* We use an array to store watchers. It will cause holes when remove some watchers.
* watcher->array_index is used to reset to the original hole if the watcher was deleted before.
* */
if (watcher->array_index == -1) {
cetcd_array_append(watchers, watcher);
watcher->array_index = cetcd_array_size(watchers) - 1;
} else {
w = cetcd_array_get(watchers, watcher->array_index);
if (w) {
cetcd_watcher_release(w);
}
cetcd_array_set(watchers, watcher->array_index, watcher);
}
return 1;
}
int cetcd_del_watcher(cetcd_array *watchers, cetcd_watcher *watcher) {
int index;
index = watcher->array_index;
if (watcher && index >= 0) {
cetcd_array_set(watchers, index, NULL);
cetcd_watcher_release(watcher);
}
return 1;
}
int cetcd_stop_watcher(cetcd_client *cli, cetcd_watcher *watcher) {
/* Clear the callback function pointer to ensure to stop notify the user
* Set once to 1 indicates that the watcher would stop after next trigger.
*
* The watcher object would be freed by cetcd_reap_watchers
* Watchers may hang forever if it would be never triggered after set once to 1
* FIXME: Cancel the blocking watcher
* */
UNUSED(cli);
watcher->callback = NULL;
watcher->once = 1;
return 1;
}
static int cetcd_reap_watchers(cetcd_client *cli, CURLM *mcurl) {
uint64_t index;
int added, ignore;
CURLMsg *msg;
CURL *curl;
cetcd_string url;
cetcd_watcher *watcher;
cetcd_response *resp;
added = 0;
index = 0;
while ((msg = curl_multi_info_read(mcurl, &ignore)) != NULL) {
if (msg->msg == CURLMSG_DONE) {
curl = msg->easy_handle;
curl_easy_getinfo(curl, CURLINFO_PRIVATE, &watcher);
resp = watcher->parser->resp;
index = watcher->index;
if (msg->data.result != CURLE_OK) {
/*try next in round-robin ways*/
/*FIXME There is a race condition if multiple watchers failed*/
if (watcher->attempts) {
cli->picked = (cli->picked+1)%(cetcd_array_size(cli->addresses));
url = cetcd_watcher_build_url(cli, watcher);
curl_easy_setopt(watcher->curl, CURLOPT_URL, url);
sdsfree(url);
curl_multi_remove_handle(mcurl, curl);
watcher->parser->st = 0;
curl_easy_reset(curl);
cetcd_curl_setopt(curl, watcher);
curl_multi_add_handle(mcurl, curl);
/*++added;
*watcher->attempts --;
*/
continue;
} else {
resp->err = calloc(1, sizeof(cetcd_error));
resp->err->ecode = error_cluster_failed;
resp->err->message = sdsnew("cetcd_reap_watchers: all cluster servers failed.");
}
}
if (watcher->callback) {
watcher->callback(watcher->userdata, resp);
if (resp->err && resp->err->ecode != 401/* not outdated*/) {
curl_multi_remove_handle(mcurl, curl);
cetcd_watcher_release(watcher);
break;
}
if (resp->node) {
index = resp->node->modified_index;
} else {
++ index;
}
cetcd_response_release(resp);
watcher->parser->resp = NULL; /*surpress it be freed again by cetcd_watcher_release*/
}
if (!watcher->once) {
curl_multi_remove_handle(mcurl, curl);
cetcd_watcher_reset(watcher);
if (watcher->index) {
watcher->index = index + 1;
url = cetcd_watcher_build_url(cli, watcher);
curl_easy_setopt(watcher->curl, CURLOPT_URL, url);
sdsfree(url);
}
curl_multi_add_handle(mcurl, watcher->curl);
++added;
continue;
}
curl_multi_remove_handle(mcurl, curl);
cetcd_watcher_release(watcher);
}
}
return added;
}
int cetcd_multi_watch(cetcd_client *cli, cetcd_array *watchers) {
int i, count;
int maxfd, left, added;
long timeout;
long backoff, backoff_max;
fd_set r, w, e;
cetcd_watcher *watcher;
CURLM *mcurl;
struct timeval tv;
mcurl = curl_multi_init();
count = cetcd_array_size(watchers);
for (i = 0; i < count; ++i) {
watcher = cetcd_array_get(watchers, i);
curl_easy_setopt(watcher->curl, CURLOPT_PRIVATE, watcher);
curl_multi_add_handle(mcurl, watcher->curl);
}
backoff = 100; /*100ms*/
backoff_max = 1000; /*1 sec*/
for(;;) {
curl_multi_perform(mcurl, &left);
if (left) {
FD_ZERO(&r);
FD_ZERO(&w);
FD_ZERO(&e);
curl_multi_timeout(mcurl, &timeout);
if (timeout == -1) {
timeout = 100; /*wait for 0.1 seconds*/
}
tv.tv_sec = timeout/1000;
tv.tv_usec = (timeout%1000)*1000;
curl_multi_fdset(mcurl, &r, &w, &e, &maxfd);
/*TODO handle errors*/
select(maxfd+1, &r, &w, &e, &tv);
curl_multi_perform(mcurl, &left);
}
added = cetcd_reap_watchers(cli, mcurl);
if (added == 0 && left == 0) {
/* It will call curl_multi_perform immediately if:
* 1. left is 0
* 2. a new attempt should be issued
* It is expected to sleep a mount time between attempts.
* So we fix this by increasing added counter only
* when a new request should be issued.
* When added is 0, maybe there are retring requests or nothing.
* Either situations should wait before issuing the request.
* */
if (backoff < backoff_max) {
backoff = 2 * backoff;
} else {
backoff = backoff_max;
}
tv.tv_sec = backoff/1000;
tv.tv_usec = (backoff%1000) * 1000;
select(1, 0, 0, 0, &tv);
}
}
curl_multi_cleanup(mcurl);
return count;
}
static void *cetcd_multi_watch_wrapper(void *args[]) {
cetcd_client *cli;
cetcd_array *watchers;
cli = args[0];
watchers = args[1];
free(args);
cetcd_multi_watch(cli, watchers);
return 0;
}
cetcd_watch_id cetcd_multi_watch_async(cetcd_client *cli, cetcd_array *watchers) {
pthread_t thread;
void **args;
args = calloc(2, sizeof(void *));
args[0] = cli;
args[1] = watchers;
pthread_create(&thread, NULL, (void *(*)(void *))cetcd_multi_watch_wrapper, args);
return thread;
}
int cetcd_multi_watch_async_stop(cetcd_client *cli, cetcd_watch_id wid) {
(void) cli;
/* Cancel causes the thread exit immediately, so the resouce has been
* allocted won't be freed. The memory leak is OK because the process
* is going to exit.
* TODO fix the memory leaks
* */
pthread_cancel(wid);
pthread_join(wid, 0);
return 0;
}
cetcd_response *cetcd_get(cetcd_client *cli, const char *key) {
return cetcd_lsdir(cli, key, 0, 0);
}
cetcd_response *cetcd_lsdir(cetcd_client *cli, const char *key, int sort, int recursive) {
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_GET;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
if (sort) {
req.uri = sdscatprintf(req.uri, "?sorted=true");
}
if (recursive){
req.uri = sdscatprintf(req.uri, "%crecursive=true", sort?'&':'?');
}
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
cetcd_response *cetcd_set(cetcd_client *cli, const char *key,
const char *value, uint64_t ttl) {
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
char *value_escaped;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
value_escaped = curl_easy_escape(cli->curl, value, strlen(value));
params = sdscatprintf(sdsempty(), "value=%s", value_escaped);
curl_free(value_escaped);
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_mkdir(cetcd_client *cli, const char *key, uint64_t ttl){
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
params = sdscatprintf(sdsempty(), "dir=true&prevExist=false");
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_setdir(cetcd_client *cli, const char *key, uint64_t ttl){
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
params = sdscatprintf(sdsempty(), "dir=true");
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_updatedir(cetcd_client *cli, const char *key, uint64_t ttl){
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
params = sdscatprintf(sdsempty(), "dir=true&prevExist=true");
if (ttl){
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_update(cetcd_client *cli, const char *key,
const char *value, uint64_t ttl, int refresh) {
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
params = sdscatprintf(sdsempty(), "prevExist=true");
if (value) {
char *value_escaped;
value_escaped = curl_easy_escape(cli->curl, value, strlen(value));
params = sdscatprintf(params, "&value=%s", value_escaped);
curl_free(value_escaped);
}
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
if (refresh) {
params = sdscatprintf(params, "&refresh=true");
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_create(cetcd_client *cli, const char *key,
const char *value, uint64_t ttl){
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
char *value_escaped;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
value_escaped = curl_easy_escape(cli->curl, value, strlen(value));
params = sdscatprintf(sdsempty(), "prevExist=false&value=%s", value_escaped);
curl_free(value_escaped);
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_create_in_order(cetcd_client *cli, const char *key,
const char *value, uint64_t ttl){
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
char *value_escaped;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_POST;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(),"%s%s", cli->keys_space, key);
value_escaped = curl_easy_escape(cli->curl, value, strlen(value));
params = sdscatprintf(sdsempty(), "value=%s", value_escaped);
curl_free(value_escaped);
if (ttl){
params = sdscatprintf(params ,"&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_delete(cetcd_client *cli, const char *key) {
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_DELETE;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
cetcd_response *cetcd_rmdir(cetcd_client *cli, const char *key, int recursive){
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_DELETE;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s?dir=true", cli->keys_space, key);
if (recursive){
req.uri = sdscatprintf(req.uri, "&recursive=true");
}
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
cetcd_response *cetcd_watch(cetcd_client *cli, const char *key, uint64_t index) {
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_GET;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s?wait=true&waitIndex=%lu", cli->keys_space, key, index);
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
cetcd_response *cetcd_watch_recursive(cetcd_client *cli, const char *key, uint64_t index) {
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_GET;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s?wait=true&recursive=true&waitIndex=%lu", cli->keys_space, key, index);
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
cetcd_response *cetcd_cmp_and_swap(cetcd_client *cli, const char *key, const char *value, const char *prev, uint64_t ttl) {
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
char *value_escaped;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
value_escaped = curl_easy_escape(cli->curl, value, strlen(value));
params = sdscatprintf(sdsempty(), "value=%s&prevValue=%s", value_escaped, prev);
curl_free(value_escaped);
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_cmp_and_swap_by_index(cetcd_client *cli, const char *key, const char *value, uint64_t prev, uint64_t ttl) {
cetcd_request req;
cetcd_response *resp;
cetcd_string params;
char *value_escaped;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_PUT;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s", cli->keys_space, key);
value_escaped = curl_easy_escape(cli->curl, value, strlen(value));
params = sdscatprintf(sdsempty(), "value=%s&prevIndex=%lu", value_escaped, prev);
curl_free(value_escaped);
if (ttl) {
params = sdscatprintf(params, "&ttl=%lu", ttl);
}
req.data = params;
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
sdsfree(params);
return resp;
}
cetcd_response *cetcd_cmp_and_delete(cetcd_client *cli, const char *key, const char *prev) {
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_DELETE;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s?prevValue=%s", cli->keys_space, key, prev);
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
cetcd_response *cetcd_cmp_and_delete_by_index(cetcd_client *cli, const char *key, uint64_t prev) {
cetcd_request req;
cetcd_response *resp;
memset(&req, 0, sizeof(cetcd_request));
req.method = ETCD_HTTP_DELETE;
req.api_type = ETCD_KEYS;
req.uri = sdscatprintf(sdsempty(), "%s%s?prevIndex=%lu", cli->keys_space, key, prev);
resp = cetcd_cluster_request(cli, &req);
sdsfree(req.uri);
return resp;
}
void cetcd_node_release(cetcd_response_node *node) {
int i, count;
cetcd_response_node *n;
if (node->nodes) {
count = cetcd_array_size(node->nodes);
for (i = 0; i < count; ++i) {
n = cetcd_array_get(node->nodes, i);
cetcd_node_release(n);
}
cetcd_array_release(node->nodes);
}
if (node->key) {
sdsfree(node->key);
}
if (node->value) {
sdsfree(node->value);
}
free(node);
}
void cetcd_response_release(cetcd_response *resp) {
if(resp) {
if (resp->err) {
cetcd_error_release(resp->err);
resp->err = NULL;
}
if (resp->node) {
cetcd_node_release(resp->node);
}
if (resp->prev_node) {
cetcd_node_release(resp->prev_node);
}
free(resp);
}
}
void cetcd_error_release(cetcd_error *err) {
if (err) {
if (err->message) {
sdsfree(err->message);
}
if (err->cause) {
sdsfree(err->cause);
}
free(err);
}
}
static void cetcd_node_print(cetcd_response_node *node) {
int i, count;
cetcd_response_node *n;
if (node) {
printf("Node TTL: %lu\n", node->ttl);
printf("Node ModifiedIndex: %lu\n", node->modified_index);
printf("Node CreatedIndex: %lu\n", node->created_index);
printf("Node Key: %s\n", node->key);
printf("Node Value: %s\n", node->value);
printf("Node Dir: %d\n", node->dir);
printf("\n");
if (node->nodes) {
count = cetcd_array_size(node->nodes);
for (i = 0; i < count; ++i) {
n = cetcd_array_get(node->nodes, i);
cetcd_node_print(n);
}
}
}
}
void cetcd_response_print(cetcd_response *resp) {
if (resp->err) {
printf("Error Code:%d\n", resp->err->ecode);
printf("Error Message:%s\n", resp->err->message);
printf("Error Cause:%s\n", resp->err->cause);
return;
}
printf("Etcd Action:%s\n", cetcd_event_action[resp->action]);
printf("Etcd Index:%lu\n", resp->etcd_index);
printf("Raft Index:%lu\n", resp->raft_index);
printf("Raft Term:%lu\n", resp->raft_term);
if (resp->node) {
printf("-------------Node------------\n");
cetcd_node_print(resp->node);
}
if (resp->prev_node) {
printf("-----------prevNode------------\n");
cetcd_node_print(resp->prev_node);
}
}
size_t cetcd_parse_response(char *ptr, size_t size, size_t nmemb, void *userdata) {
int len, i;
char *key, *val;
cetcd_response_parser *parser;
yajl_status status;
cetcd_response *resp = NULL;
cetcd_array *addrs = NULL;
enum resp_parser_st {
request_line_start_st,
request_line_end_st,
request_line_http_status_start_st,
request_line_http_status_st,
request_line_http_status_end_st,
header_key_start_st,
header_key_st,
header_key_end_st,
header_val_start_st,
header_val_st,
header_val_end_st,
blank_line_st,
json_start_st,
json_end_st,
response_discard_st
};
/* Headers we are interested in:
* X-Etcd-Index: 14695
* X-Raft-Index: 672930
* X-Raft-Term: 12
* */
parser = userdata;
if (parser->api_type == ETCD_MEMBERS) {
addrs = parser->resp;
} else {
resp = parser->resp;
}
len = size * nmemb;
for (i = 0; i < len; ++i) {
if (parser->st == request_line_start_st) {
if (ptr[i] == ' ') {
parser->st = request_line_http_status_start_st;
}
continue;
}
if (parser->st == request_line_end_st) {
if (ptr[i] == '\n') {
parser->st = header_key_start_st;
}
continue;
}
if (parser->st == request_line_http_status_start_st) {
parser->buf = sdscatlen(parser->buf, ptr+i, 1);
parser->st = request_line_http_status_st;
continue;
}
if (parser->st == request_line_http_status_st) {
if (ptr[i] == ' ') {
parser->st = request_line_http_status_end_st;
} else {
parser->buf = sdscatlen(parser->buf, ptr+i, 1);
continue;
}
}
if (parser->st == request_line_http_status_end_st) {
val = parser->buf;
parser->http_status = atoi(val);
sdsclear(parser->buf);
parser->st = request_line_end_st;
if (parser->api_type == ETCD_MEMBERS && parser->http_status != 200) {
parser->st = response_discard_st;
}
continue;
}
if (parser->st == header_key_start_st) {
if (ptr[i] == '\r') {
++i;
}
if (ptr[i] == '\n') {
parser->st = blank_line_st;
if (parser->http_status >= 300 && parser->http_status < 400) {
/*this is a redirection, restart the state machine*/
parser->st = request_line_start_st;
break;
}
continue;
}
parser->st = header_key_st;
}
if (parser->st == header_key_st) {
parser->buf = sdscatlen(parser->buf, ptr+i, 1);
if (ptr[i] == ':') {
parser->st = header_key_end_st;
} else {
continue;
}
}
if (parser->st == header_key_end_st) {
parser->st = header_val_start_st;
continue;
}
if (parser->st == header_val_start_st) {