*
* Copyright(c) 2016 Intel Corporation. All rights reserved.
*
- * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ *of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
- * of the Software, and to permit persons to whom the Software is furnished to do
+ * of the Software, and to permit persons to whom the Software is furnished to
+ *do
* so, subject to the following conditions:
*
- * The above copyright notice and this permission notice shall be included in all
+ * The above copyright notice and this permission notice shall be included in
+ *all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#define OVS_DB_POLL_TIMEOUT 1 /* poll receive timeout (sec) */
#define OVS_DB_POLL_READ_BLOCK_SIZE 512 /* read block size (bytes) */
#define OVS_DB_DEFAULT_DB_NAME "Open_vSwitch"
-#define OVS_DB_RECONNECT_TIMEOUT 1 /* reconnect timeout (sec) */
+#define OVS_DB_EVENT_NONE 0
#define OVS_DB_EVENT_TIMEOUT 5 /* event thread timeout (sec) */
#define OVS_DB_EVENT_TERMINATE 1
#define OVS_DB_EVENT_CONN_ESTABLISHED 2
ovs_db_callback_t cb;
char service[OVS_DB_ADDR_SERVICE_SIZE];
char node[OVS_DB_ADDR_NODE_SIZE];
+ char unix_path[OVS_DB_ADDR_NODE_SIZE];
int sock;
};
+/* Global variables */
+static uint64_t ovs_uid = 0;
+static pthread_mutex_t ovs_uid_mutex = PTHREAD_MUTEX_INITIALIZER;
+
/* Post an event to event thread.
* Possible events are:
* OVS_DB_EVENT_TERMINATE
pthread_mutex_lock(&pdb->poll_thread.mutex);
state = pdb->poll_thread.state;
pthread_mutex_unlock(&pdb->poll_thread.mutex);
- return (state == OVS_DB_POLL_STATE_RUNNING);
-}
-
-/* Terminate POLL thread */
-static void ovs_db_poll_terminate(ovs_db_t *pdb) {
- pthread_mutex_lock(&pdb->poll_thread.mutex);
- pdb->poll_thread.state = OVS_DB_POLL_STATE_EXITING;
- pthread_mutex_unlock(&pdb->poll_thread.mutex);
+ return state == OVS_DB_POLL_STATE_RUNNING;
}
/* Generate unique identifier (UID). It is used by OVS DB API
* to set "id" field for any OVS DB JSON request. */
static uint64_t ovs_uid_generate() {
- struct timespec ts;
- clock_gettime(CLOCK_MONOTONIC, &ts);
- return ((ts.tv_sec << 32) | (ts.tv_nsec & UINT32_MAX));
+ uint64_t new_uid;
+ pthread_mutex_lock(&ovs_uid_mutex);
+ new_uid = ++ovs_uid;
+ pthread_mutex_unlock(&ovs_uid_mutex);
+ return new_uid;
}
/*
/* Remove callback from OVS DB object */
static void ovs_db_callback_remove(ovs_db_t *pdb, ovs_callback_t *del_cb) {
+ pthread_mutex_lock(&pdb->mutex);
ovs_callback_t *pre_cb = del_cb->prev;
ovs_callback_t *next_cb = del_cb->next;
- pthread_mutex_lock(&pdb->mutex);
if (next_cb)
next_cb->prev = del_cb->prev;
/* Remove all callbacks form OVS DB object */
static void ovs_db_callback_remove_all(ovs_db_t *pdb) {
pthread_mutex_lock(&pdb->mutex);
- for (ovs_callback_t *del_cb = pdb->remote_cb; pdb->remote_cb;
- del_cb = pdb->remote_cb) {
+ while (pdb->remote_cb != NULL) {
+ ovs_callback_t *del_cb = pdb->remote_cb;
pdb->remote_cb = del_cb->next;
- free(del_cb);
+ sfree(del_cb);
}
- pdb->remote_cb = NULL;
pthread_mutex_unlock(&pdb->mutex);
}
* to requested callback otherwise NULL is returned.
*
* IMPORTANT NOTE:
- * The OVS DB mutex should be locked by the caller
+ * The OVS DB mutex MUST be locked by the caller
* to make sure that returned callback is still valid.
*/
static ovs_callback_t *ovs_db_callback_get(ovs_db_t *pdb, uint64_t uid) {
while (rem > 0) {
if ((nbytes = send(pdb->sock, data + off, rem, 0)) <= 0)
- return (-1);
+ return -1;
rem -= (size_t)nbytes;
off += (size_t)nbytes;
}
- return (0);
+ return 0;
}
/*
yajl_val jobj_value = NULL;
const char *obj_key = NULL;
size_t obj_len = 0;
- yajl_gen_status yajl_gen_ret;
+ yajl_gen_status yajl_gen_ret = yajl_gen_status_ok;
+
+ if (jval == NULL)
+ return yajl_gen_generation_complete;
if (YAJL_IS_STRING(jval))
OVS_YAJL_CALL(ovs_yajl_gen_tstring, jgen, YAJL_GET_STRING(jval));
array_len = YAJL_GET_ARRAY(jval)->len;
jvalues = YAJL_GET_ARRAY(jval)->values;
OVS_YAJL_CALL(yajl_gen_array_open, jgen);
- for (int i = 0; i < array_len; i++)
+ for (size_t i = 0; i < array_len; i++)
OVS_YAJL_CALL(ovs_yajl_gen_val, jgen, jvalues[i]);
OVS_YAJL_CALL(yajl_gen_array_close, jgen);
} else if (YAJL_IS_OBJECT(jval)) {
/* create new object and add all elements into the object */
OVS_YAJL_CALL(yajl_gen_map_open, jgen);
obj_len = YAJL_GET_OBJECT(jval)->len;
- for (int i = 0; i < obj_len; i++) {
+ for (size_t i = 0; i < obj_len; i++) {
obj_key = YAJL_GET_OBJECT(jval)->keys[i];
jobj_value = YAJL_GET_OBJECT(jval)->values[i];
OVS_YAJL_CALL(ovs_yajl_gen_tstring, jgen, obj_key);
yajl_gen_status yajl_gen_ret;
if ((jgen = yajl_gen_alloc(NULL)) == NULL)
- return (-1);
+ return -1;
/* check & get request attributes */
if ((jparams = yajl_tree_get(jnode, params_path, yajl_t_array)) == NULL ||
}
/* clean up and return success */
yajl_gen_clear(jgen);
- return (0);
+ return 0;
yajl_gen_failure:
/* release memory */
yajl_gen_clear(jgen);
- return (-1);
+ return -1;
}
/* Get OVS DB registered callback by YAJL val. The YAJL
yajl_val jvalue;
yajl_val jparams;
yajl_val jtable_updates;
- yajl_val jtable_update;
- size_t obj_len = 0;
- const char *table_name = NULL;
const char *params_path[] = {"params", NULL};
const char *id_path[] = {"id", NULL};
/* check & get request attributes */
if ((jparams = yajl_tree_get(jnode, params_path, yajl_t_array)) == NULL ||
- (yajl_tree_get(jnode, id_path, yajl_t_null) == NULL))
- goto ovs_failure;
+ (yajl_tree_get(jnode, id_path, yajl_t_null) == NULL)) {
+ OVS_ERROR("invalid OVS DB request received");
+ return -1;
+ }
/* check array length: [<json-value>, <table-updates>] */
- if (YAJL_GET_ARRAY(jparams)->len != 2)
- goto ovs_failure;
+ if ((YAJL_GET_ARRAY(jparams) == NULL) ||
+ (YAJL_GET_ARRAY(jparams)->len != 2)) {
+ OVS_ERROR("invalid OVS DB request received");
+ return -1;
+ }
jvalue = YAJL_GET_ARRAY(jparams)->values[0];
jtable_updates = YAJL_GET_ARRAY(jparams)->values[1];
- if ((!YAJL_IS_OBJECT(jtable_updates)) || (!YAJL_IS_STRING(jvalue)))
- goto ovs_failure;
+ if ((!YAJL_IS_OBJECT(jtable_updates)) || (!YAJL_IS_STRING(jvalue))) {
+ OVS_ERROR("invalid OVS DB request id or table update received");
+ return -1;
+ }
/* find registered callback based on <json-value> */
pthread_mutex_lock(&pdb->mutex);
cb = ovs_db_table_callback_get(pdb, jvalue);
if (cb == NULL || cb->table.call == NULL) {
+ OVS_ERROR("No OVS DB table update callback found");
pthread_mutex_unlock(&pdb->mutex);
- goto ovs_failure;
+ return -1;
}
/* call registered callback */
cb->table.call(jtable_updates);
pthread_mutex_unlock(&pdb->mutex);
return 0;
-
-ovs_failure:
- OVS_ERROR("invalid OVS DB table update event");
- return (-1);
}
/* OVS DB result request handler.
/* check & get result attributes */
if (!jresult || !jerror || !jid)
- return (-1);
+ return -1;
/* try to find registered callback */
pthread_mutex_lock(&pdb->mutex);
}
pthread_mutex_unlock(&pdb->mutex);
- return (0);
+ return 0;
}
/* Handle JSON data (one request) and call
/* duplicate the data to make null-terminated string
* required for yajl_tree_parse() */
- if ((sjson = malloc(len + 1)) == NULL)
- return (-1);
+ if ((sjson = calloc(1, len + 1)) == NULL)
+ return -1;
sstrncpy(sjson, data, len + 1);
- OVS_DEBUG("[len=%zu] %s", len, sjson);
+ OVS_DEBUG("[len=%" PRIsz "] %s", len, sjson);
/* parse json data */
jnode = yajl_tree_parse(sjson, yajl_errbuf, sizeof(yajl_errbuf));
if (jnode == NULL) {
OVS_ERROR("yajl_tree_parse() %s", yajl_errbuf);
sfree(sjson);
- return (-1);
+ return -1;
}
/* get method name */
if ((jval = yajl_tree_get(jnode, method_path, yajl_t_string)) != NULL) {
- method = YAJL_GET_STRING(jval);
+ if ((method = YAJL_GET_STRING(jval)) == NULL) {
+ yajl_tree_free(jnode);
+ sfree(sjson);
+ return -1;
+ }
if (strcmp("echo", method) == 0) {
/* echo request from the server */
if (ovs_db_table_echo_cb(pdb, jnode) < 0)
/* release memory */
yajl_tree_free(jnode);
sfree(sjson);
- return (0);
+ return 0;
}
/*
/* allocate new chunk of memory */
new_buff = realloc(jreader->buff_ptr, (jreader->buff_size + data_len));
if (new_buff == NULL)
- return (-1);
+ return -1;
/* point to new allocated memory */
jreader->buff_ptr = new_buff;
/* store input data */
memcpy(jreader->buff_ptr + jreader->buff_offset, data, data_len);
jreader->buff_offset += data_len;
- return (0);
+ return 0;
}
/* Pop one fully-fledged JSON if already exists. Returns 0 if
char *json = NULL;
/* search open/close brace */
- for (int i = jreader->json_offset; i < jreader->buff_offset; i++) {
+ for (size_t i = jreader->json_offset; i < jreader->buff_offset; i++) {
if (jreader->buff_ptr[i] == '{') {
nbraces++;
} else if (jreader->buff_ptr[i] == '}')
*json_ptr = jreader->buff_ptr + jreader->json_offset;
*json_len_ptr = json_len + 1;
jreader->json_offset = i + 1;
- return (0);
+ return 0;
}
/* increase JSON data length */
* and zero rest of the buffer data */
json = &jreader->buff_ptr[jreader->json_offset];
json_len = jreader->buff_offset - jreader->json_offset;
- for (int i = 0; i < jreader->buff_size; i++)
+ for (size_t i = 0; i < jreader->buff_size; i++)
jreader->buff_ptr[i] = ((i < json_len) ? (json[i]) : (0));
jreader->buff_offset = json_len;
} else
jreader->json_offset = 0;
}
- return (-1);
+ return -1;
}
/* Reset JSON reader. It is useful when start processing
}
}
-/* Reconnect to OVD DB and call the OVS DB post connection init callback
+/* Reconnect to OVS DB and call the OVS DB post connection init callback
* if connection has been established.
*/
-static int ovs_db_reconnect(ovs_db_t *pdb) {
- char errbuff[OVS_ERROR_BUFF_SIZE];
- const char unix_prefix[] = "unix:";
- struct addrinfo *result, *rp;
- _Bool is_connected = 0;
- struct sockaddr_un saunix;
-
- /* remove all registered OVS DB table/result callbacks */
- ovs_db_callback_remove_all(pdb);
-
- if (strncmp(pdb->node, unix_prefix, strlen(unix_prefix)) == 0) {
- /* create unix socket address */
- rp = calloc(1, sizeof(struct addrinfo));
+static void ovs_db_reconnect(ovs_db_t *pdb) {
+ const char *node_info = pdb->node;
+ struct addrinfo *result;
+
+ if (pdb->unix_path[0] != '\0') {
+ /* use UNIX socket instead of INET address */
+ node_info = pdb->unix_path;
+ result = calloc(1, sizeof(struct addrinfo));
struct sockaddr_un *sa_unix = calloc(1, sizeof(struct sockaddr_un));
- if (rp == NULL || sa_unix == NULL) {
- sfree(rp);
+ if (result == NULL || sa_unix == NULL) {
+ sfree(result);
sfree(sa_unix);
- return (1);
+ return;
}
- rp->ai_family = AF_UNIX;
- rp->ai_socktype = SOCK_STREAM;
- rp->ai_addrlen = sizeof(*sa_unix);
- rp->ai_addr = (struct sockaddr *)sa_unix;
- sa_unix->sun_family = rp->ai_family;
- sstrncpy(sa_unix->sun_path, (pdb->node + strlen(unix_prefix)),
- sizeof(sa_unix->sun_path));
- result = rp;
+ result->ai_family = AF_UNIX;
+ result->ai_socktype = SOCK_STREAM;
+ result->ai_addrlen = sizeof(*sa_unix);
+ result->ai_addr = (struct sockaddr *)sa_unix;
+ sa_unix->sun_family = result->ai_family;
+ sstrncpy(sa_unix->sun_path, pdb->unix_path, sizeof(sa_unix->sun_path));
} else {
- /* intet socket address */
- int ret = 0;
+ /* inet socket address */
struct addrinfo hints;
/* setup criteria for selecting the socket address */
hints.ai_socktype = SOCK_STREAM;
/* get socket addresses */
- if ((ret = getaddrinfo(pdb->node, pdb->service, &hints, &result)) != 0) {
+ int ret = getaddrinfo(pdb->node, pdb->service, &hints, &result);
+ if (ret != 0) {
OVS_ERROR("getaddrinfo(): %s", gai_strerror(ret));
- return (1);
+ return;
}
}
/* try to connect to the server */
- for (rp = result; rp != NULL; rp = rp->ai_next) {
- if ((pdb->sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol)) <
- 0) {
- sstrerror(errno, errbuff, sizeof(errbuff));
- OVS_DEBUG("socket(): %s", errbuff);
+ for (struct addrinfo *rp = result; rp != NULL; rp = rp->ai_next) {
+ int sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+ if (sock < 0) {
+ OVS_DEBUG("socket(): %s", STRERRNO);
continue;
}
- if (connect(pdb->sock, rp->ai_addr, rp->ai_addrlen) < 0) {
- sstrerror(errno, errbuff, sizeof(errbuff));
- OVS_DEBUG("connect(): %s [family=%d]", errbuff, rp->ai_family);
- close(pdb->sock);
+ if (connect(sock, rp->ai_addr, rp->ai_addrlen) < 0) {
+ close(sock);
+ OVS_DEBUG("connect(): %s [family=%d]", STRERRNO, rp->ai_family);
} else {
- is_connected = 1;
+ /* send notification to event thread */
+ pdb->sock = sock;
+ ovs_db_event_post(pdb, OVS_DB_EVENT_CONN_ESTABLISHED);
break;
}
}
- /* send notification to event thread */
- if (is_connected)
- ovs_db_event_post(pdb, OVS_DB_EVENT_CONN_ESTABLISHED);
- else
- OVS_ERROR("connect to \"%s\" failed", pdb->node);
+ if (pdb->sock < 0)
+ OVS_ERROR("connect to \"%s\" failed", node_info);
freeaddrinfo(result);
- return !is_connected;
}
/* POLL worker thread.
static void *ovs_poll_worker(void *arg) {
ovs_db_t *pdb = (ovs_db_t *)arg; /* pointer to OVS DB */
ovs_json_reader_t *jreader = NULL;
- const char *json;
- size_t json_len;
- ssize_t nbytes = 0;
- char buff[OVS_DB_POLL_READ_BLOCK_SIZE];
- struct pollfd poll_fd;
- int poll_ret = 0;
+ struct pollfd poll_fd = {
+ .fd = pdb->sock, .events = POLLIN | POLLPRI, .revents = 0,
+ };
+ /* create JSON reader instance */
if ((jreader = ovs_json_reader_alloc()) == NULL) {
OVS_ERROR("initialize json reader failed");
- goto thread_exit;
+ return NULL;
}
- /* start polling data */
- poll_fd.fd = pdb->sock;
- poll_fd.events = POLLIN | POLLPRI;
- poll_fd.revents = 0;
-
/* poll data */
while (ovs_db_poll_is_running(pdb)) {
- poll_ret = poll(&poll_fd, 1, /* ms */ OVS_DB_POLL_TIMEOUT * 1000);
- if (poll_ret > 0) {
- if (poll_fd.revents & POLLNVAL) {
- /* invalid file descriptor, reconnect */
- if (ovs_db_reconnect(pdb) != 0) {
- /* sleep awhile until next reconnect */
- usleep(OVS_DB_RECONNECT_TIMEOUT * 1000000);
- }
- ovs_json_reader_reset(jreader);
- poll_fd.fd = pdb->sock;
- } else if ((poll_fd.revents & POLLERR) || (poll_fd.revents & POLLHUP)) {
- /* connection is broken */
- OVS_ERROR("poll() peer closed its end of the channel");
- ovs_db_event_post(pdb, OVS_DB_EVENT_CONN_TERMINATED);
- close(poll_fd.fd);
- } else if ((poll_fd.revents & POLLIN) || (poll_fd.revents & POLLPRI)) {
- /* read incoming data */
- nbytes = recv(poll_fd.fd, buff, OVS_DB_POLL_READ_BLOCK_SIZE, 0);
- if (nbytes > 0) {
- OVS_DEBUG("recv(): received %d bytes of data", (int)nbytes);
- ovs_json_reader_push_data(jreader, buff, nbytes);
- while (!ovs_json_reader_pop(jreader, &json, &json_len))
- /* process JSON data */
- ovs_db_json_data_process(pdb, json, json_len);
- } else if (nbytes == 0) {
- OVS_ERROR("recv() peer has performed an orderly shutdown");
- ovs_db_event_post(pdb, OVS_DB_EVENT_CONN_TERMINATED);
- close(poll_fd.fd);
- } else {
- OVS_ERROR("recv() receive data error");
- break;
- }
- } /* poll() POLLIN & POLLPRI */
- } else if (poll_ret == 0)
- OVS_DEBUG("poll() timeout");
- else {
- OVS_ERROR("poll() error");
+ poll_fd.fd = pdb->sock;
+ int poll_ret = poll(&poll_fd, 1, /* ms */ OVS_DB_POLL_TIMEOUT * 1000);
+ if (poll_ret < 0) {
+ OVS_ERROR("poll(): %s", STRERRNO);
break;
+ } else if (poll_ret == 0) {
+ OVS_DEBUG("poll(): timeout");
+ if (pdb->sock < 0)
+ /* invalid fd, so try to reconnect */
+ ovs_db_reconnect(pdb);
+ continue;
+ }
+ if (poll_fd.revents & POLLNVAL) {
+ /* invalid file descriptor, clean-up */
+ ovs_db_callback_remove_all(pdb);
+ ovs_json_reader_reset(jreader);
+ /* setting poll FD to -1 tells poll() call to ignore this FD.
+ * In that case poll() call will return timeout all the time */
+ pdb->sock = (-1);
+ } else if ((poll_fd.revents & POLLERR) || (poll_fd.revents & POLLHUP)) {
+ /* connection is broken */
+ close(poll_fd.fd);
+ ovs_db_event_post(pdb, OVS_DB_EVENT_CONN_TERMINATED);
+ OVS_ERROR("poll() peer closed its end of the channel");
+ } else if ((poll_fd.revents & POLLIN) || (poll_fd.revents & POLLPRI)) {
+ /* read incoming data */
+ char buff[OVS_DB_POLL_READ_BLOCK_SIZE];
+ ssize_t nbytes = recv(poll_fd.fd, buff, sizeof(buff), 0);
+ if (nbytes < 0) {
+ OVS_ERROR("recv(): %s", STRERRNO);
+ /* read error? Try to reconnect */
+ close(poll_fd.fd);
+ continue;
+ } else if (nbytes == 0) {
+ close(poll_fd.fd);
+ ovs_db_event_post(pdb, OVS_DB_EVENT_CONN_TERMINATED);
+ OVS_ERROR("recv() peer has performed an orderly shutdown");
+ continue;
+ }
+ /* read incoming data */
+ size_t json_len = 0;
+ const char *json = NULL;
+ OVS_DEBUG("recv(): received %zd bytes of data", nbytes);
+ ovs_json_reader_push_data(jreader, buff, nbytes);
+ while (!ovs_json_reader_pop(jreader, &json, &json_len))
+ /* process JSON data */
+ ovs_db_json_data_process(pdb, json, json_len);
}
}
-thread_exit:
OVS_DEBUG("poll thread has been completed");
ovs_json_reader_free(jreader);
- pthread_exit((void *)0);
- return ((void *)0);
+ return NULL;
}
/* EVENT worker thread.
* Perform task based on incoming events. This
* task can be done asynchronously which allows to
- * handle OVD DB callback like 'init_cb'.
+ * handle OVS DB callback like 'init_cb'.
*/
static void *ovs_event_worker(void *arg) {
- int ret = 0;
ovs_db_t *pdb = (ovs_db_t *)arg;
- struct timespec ts;
while (pdb->event_thread.value != OVS_DB_EVENT_TERMINATE) {
/* wait for an event */
+ struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += (OVS_DB_EVENT_TIMEOUT);
- ret = pthread_cond_timedwait(&pdb->event_thread.cond,
- &pdb->event_thread.mutex, &ts);
- if (!ret) {
+ int ret = pthread_cond_timedwait(&pdb->event_thread.cond,
+ &pdb->event_thread.mutex, &ts);
+ if (!ret || ret == ETIMEDOUT) {
/* handle the event */
OVS_DEBUG("handle event %d", pdb->event_thread.value);
switch (pdb->event_thread.value) {
case OVS_DB_EVENT_CONN_ESTABLISHED:
if (pdb->cb.post_conn_init)
pdb->cb.post_conn_init(pdb);
+ /* reset event */
+ pdb->event_thread.value = OVS_DB_EVENT_NONE;
break;
case OVS_DB_EVENT_CONN_TERMINATED:
if (pdb->cb.post_conn_terminate)
pdb->cb.post_conn_terminate();
+ /* reset event */
+ pdb->event_thread.value = OVS_DB_EVENT_NONE;
+ break;
+ case OVS_DB_EVENT_NONE:
+ /* wait timeout */
+ OVS_DEBUG("no event received (timeout)");
break;
default:
OVS_DEBUG("unknown event received");
break;
}
- } else if (ret == ETIMEDOUT) {
- /* wait timeout */
- OVS_DEBUG("no event received (timeout)");
- continue;
} else {
/* unexpected error */
OVS_ERROR("pthread_cond_timedwait() failed");
}
}
-thread_exit:
OVS_DEBUG("event thread has been completed");
- pthread_exit((void *)0);
- return ((void *)0);
+ return NULL;
+}
+
+/* Initialize EVENT thread */
+static int ovs_db_event_thread_init(ovs_db_t *pdb) {
+ pdb->event_thread.tid = (pthread_t){0};
+ /* init event thread condition variable */
+ if (pthread_cond_init(&pdb->event_thread.cond, NULL)) {
+ return -1;
+ }
+ /* init event thread mutex */
+ if (pthread_mutex_init(&pdb->event_thread.mutex, NULL)) {
+ pthread_cond_destroy(&pdb->event_thread.cond);
+ return -1;
+ }
+ /* Hold the event thread mutex. It ensures that no events
+ * will be lost while thread is still starting. Once event
+ * thread is started and ready to accept events, it will release
+ * the mutex */
+ if (pthread_mutex_lock(&pdb->event_thread.mutex)) {
+ pthread_mutex_destroy(&pdb->event_thread.mutex);
+ pthread_cond_destroy(&pdb->event_thread.cond);
+ return -1;
+ }
+ /* start event thread */
+ pthread_t tid;
+ if (plugin_thread_create(&tid, NULL, ovs_event_worker, pdb,
+ "utils_ovs:event") != 0) {
+ pthread_mutex_unlock(&pdb->event_thread.mutex);
+ pthread_mutex_destroy(&pdb->event_thread.mutex);
+ pthread_cond_destroy(&pdb->event_thread.cond);
+ return -1;
+ }
+ pdb->event_thread.tid = tid;
+ return 0;
}
-/* Stop EVENT thread */
-static int ovs_db_event_thread_stop(ovs_db_t *pdb) {
+/* Terminate EVENT thread */
+static int ovs_db_event_thread_terminate(ovs_db_t *pdb) {
+ if (pthread_equal(pdb->event_thread.tid, (pthread_t){0})) {
+ /* already terminated */
+ return 0;
+ }
ovs_db_event_post(pdb, OVS_DB_EVENT_TERMINATE);
if (pthread_join(pdb->event_thread.tid, NULL) != 0)
- return (-1);
+ return -1;
+ /* Event thread always holds the thread mutex when
+ * performs some task (handles event) and releases it when
+ * while sleeping. Thus, if event thread exits, the mutex
+ * remains locked */
+ pdb->event_thread.tid = (pthread_t){0};
pthread_mutex_unlock(&pdb->event_thread.mutex);
+ return 0;
+}
+
+/* Destroy EVENT thread private data */
+static void ovs_db_event_thread_data_destroy(ovs_db_t *pdb) {
+ /* destroy mutex */
pthread_mutex_destroy(&pdb->event_thread.mutex);
- return (0);
+ pthread_cond_destroy(&pdb->event_thread.cond);
}
-/* Stop POLL thread */
-static int ovs_db_poll_thread_stop(ovs_db_t *pdb) {
- ovs_db_poll_terminate(pdb);
+/* Initialize POLL thread */
+static int ovs_db_poll_thread_init(ovs_db_t *pdb) {
+ pdb->poll_thread.tid = (pthread_t){0};
+ /* init event thread mutex */
+ if (pthread_mutex_init(&pdb->poll_thread.mutex, NULL)) {
+ return -1;
+ }
+ /* start poll thread */
+ pthread_t tid;
+ pdb->poll_thread.state = OVS_DB_POLL_STATE_RUNNING;
+ if (plugin_thread_create(&tid, NULL, ovs_poll_worker, pdb,
+ "utils_ovs:poll") != 0) {
+ pthread_mutex_destroy(&pdb->poll_thread.mutex);
+ return -1;
+ }
+ pdb->poll_thread.tid = tid;
+ return 0;
+}
+
+/* Destroy POLL thread */
+/* XXX: Must hold pdb->mutex when calling! */
+static int ovs_db_poll_thread_destroy(ovs_db_t *pdb) {
+ if (pthread_equal(pdb->poll_thread.tid, (pthread_t){0})) {
+ /* already destroyed */
+ return 0;
+ }
+ /* change thread state */
+ pthread_mutex_lock(&pdb->poll_thread.mutex);
+ pdb->poll_thread.state = OVS_DB_POLL_STATE_EXITING;
+ pthread_mutex_unlock(&pdb->poll_thread.mutex);
+ /* join the thread */
if (pthread_join(pdb->poll_thread.tid, NULL) != 0)
- return (-1);
+ return -1;
pthread_mutex_destroy(&pdb->poll_thread.mutex);
- return (0);
+ pdb->poll_thread.tid = (pthread_t){0};
+ return 0;
}
/*
*/
ovs_db_t *ovs_db_init(const char *node, const char *service,
- ovs_db_callback_t *cb) {
- pthread_mutexattr_t mutex_attr;
- ovs_db_t *pdb = NULL;
+ const char *unix_path, ovs_db_callback_t *cb) {
+ /* sanity check */
+ if (node == NULL || service == NULL || unix_path == NULL)
+ return NULL;
/* allocate db data & fill it */
- if ((pdb = calloc(1, sizeof(*pdb))) == NULL)
- return (NULL);
-
- /* node cannot be unset */
- if (node == NULL || strlen(node) == 0)
- return (NULL);
+ ovs_db_t *pdb = calloc(1, sizeof(*pdb));
+ if (pdb == NULL)
+ return NULL;
+ pdb->sock = -1;
/* store the OVS DB address */
sstrncpy(pdb->node, node, sizeof(pdb->node));
- if (service != NULL)
- sstrncpy(pdb->service, service, sizeof(pdb->service));
+ sstrncpy(pdb->service, service, sizeof(pdb->service));
+ sstrncpy(pdb->unix_path, unix_path, sizeof(pdb->unix_path));
/* setup OVS DB callbacks */
if (cb)
pdb->cb = *cb;
- /* prepare event thread */
- pthread_cond_init(&pdb->event_thread.cond, NULL);
- pthread_mutex_init(&pdb->event_thread.mutex, NULL);
- pthread_mutex_lock(&pdb->event_thread.mutex);
- if (plugin_thread_create(&pdb->event_thread.tid, NULL, ovs_event_worker,
- pdb) != 0) {
- OVS_ERROR("event worker start failed");
- goto failure;
+ /* init OVS DB mutex attributes */
+ pthread_mutexattr_t mutex_attr;
+ if (pthread_mutexattr_init(&mutex_attr)) {
+ OVS_ERROR("OVS DB mutex attribute init failed");
+ sfree(pdb);
+ return NULL;
}
-
- /* prepare polling thread */
- ovs_db_reconnect(pdb);
- pdb->poll_thread.state = OVS_DB_POLL_STATE_RUNNING;
- pthread_mutex_init(&pdb->poll_thread.mutex, NULL);
- if (plugin_thread_create(&pdb->poll_thread.tid, NULL, ovs_poll_worker, pdb) !=
- 0) {
- OVS_ERROR("pull worker start failed");
- goto failure;
+ /* set OVS DB mutex as recursive */
+ if (pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE)) {
+ OVS_ERROR("Failed to set OVS DB mutex as recursive");
+ pthread_mutexattr_destroy(&mutex_attr);
+ sfree(pdb);
+ return NULL;
}
-
/* init OVS DB mutex */
- if (pthread_mutexattr_init(&mutex_attr) ||
- pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE) ||
- pthread_mutex_init(&pdb->mutex, &mutex_attr)) {
+ if (pthread_mutex_init(&pdb->mutex, &mutex_attr)) {
OVS_ERROR("OVS DB mutex init failed");
- goto failure;
+ pthread_mutexattr_destroy(&mutex_attr);
+ sfree(pdb);
+ return NULL;
}
+ /* destroy mutex attributes */
+ pthread_mutexattr_destroy(&mutex_attr);
- /* return db to the caller */
- return pdb;
+ /* init event thread */
+ if (ovs_db_event_thread_init(pdb) < 0) {
+ ovs_db_destroy(pdb);
+ return NULL;
+ }
-failure:
- if (pdb->sock)
- /* close connection */
- close(pdb->sock);
- if (pdb->event_thread.tid != 0)
- /* stop event thread */
- if (ovs_db_event_thread_stop(pdb) < 0)
- OVS_ERROR("stop event thread failed");
- if (pdb->poll_thread.tid != 0)
- /* stop poll thread */
- if (ovs_db_poll_thread_stop(pdb) < 0)
- OVS_ERROR("stop poll thread failed");
- sfree(pdb);
- return NULL;
+ /* init polling thread */
+ if (ovs_db_poll_thread_init(pdb) < 0) {
+ ovs_db_destroy(pdb);
+ return NULL;
+ }
+ return pdb;
}
int ovs_db_send_request(ovs_db_t *pdb, const char *method, const char *params,
/* sanity check */
if (!pdb || !method || !params)
- return (-1);
+ return -1;
if ((jgen = yajl_gen_alloc(NULL)) == NULL)
- return (-1);
+ return -1;
/* try to parse params */
if ((jparams = yajl_tree_parse(params, NULL, 0)) == NULL) {
OVS_ERROR("params is not a JSON string");
yajl_gen_clear(jgen);
- return (-1);
+ return -1;
}
/* generate method field */
/* generate id field */
OVS_YAJL_CALL(ovs_yajl_gen_tstring, jgen, "id");
uid = ovs_uid_generate();
- ssnprintf(uid_buff, sizeof(uid_buff), "%" PRIX64, uid);
+ snprintf(uid_buff, sizeof(uid_buff), "%" PRIX64, uid);
OVS_YAJL_CALL(ovs_yajl_gen_tstring, jgen, uid_buff);
OVS_YAJL_CALL(yajl_gen_map_close, jgen);
if (cb) {
/* register result callback */
- if ((new_cb = malloc(sizeof(ovs_callback_t))) == NULL)
+ if ((new_cb = calloc(1, sizeof(ovs_callback_t))) == NULL)
goto yajl_gen_failure;
/* add new callback to front */
/* sanity check */
if (pdb == NULL || tb_name == NULL || update_cb == NULL)
- return (-1);
+ return -1;
- if ((jgen = yajl_gen_alloc(NULL)) == NULL)
- return (-1);
+ /* allocate new update callback */
+ if ((new_cb = calloc(1, sizeof(ovs_callback_t))) == NULL)
+ return -1;
- /* register table update callback */
- if ((new_cb = malloc(sizeof(ovs_callback_t))) == NULL)
- return (-1);
+ /* init YAJL generator */
+ if ((jgen = yajl_gen_alloc(NULL)) == NULL) {
+ sfree(new_cb);
+ return -1;
+ }
/* add new callback to front */
new_cb->table.call = update_cb;
OVS_YAJL_CALL(ovs_yajl_gen_tstring, jgen, OVS_DB_DEFAULT_DB_NAME);
/* uid string <json-value> */
- ssnprintf(uid_str, sizeof(uid_str), "%" PRIX64, new_cb->uid);
+ snprintf(uid_str, sizeof(uid_str), "%" PRIX64, new_cb->uid);
OVS_YAJL_CALL(ovs_yajl_gen_tstring, jgen, uid_str);
/* <monitor-requests> */
/* sanity check */
if (pdb == NULL)
- return (-1);
+ return -1;
+
+ /* stop event thread */
+ if (ovs_db_event_thread_terminate(pdb) < 0) {
+ OVS_ERROR("stop event thread failed");
+ ovs_db_ret = -1;
+ }
/* try to lock the structure before releasing */
if ((ret = pthread_mutex_lock(&pdb->mutex))) {
- OVS_ERROR("pthread_mutex_lock() DB mutext lock failed (%d)", ret);
- return (-1);
+ OVS_ERROR("pthread_mutex_lock() DB mutex lock failed (%d)", ret);
+ return -1;
}
- /* stop poll thread */
- if (ovs_db_event_thread_stop(pdb) < 0) {
- OVS_ERROR("stop poll thread failed");
- ovs_db_ret = (-1);
+ /* stop poll thread and destroy thread's private data */
+ if (ovs_db_poll_thread_destroy(pdb) < 0) {
+ OVS_ERROR("destroy poll thread failed");
+ ovs_db_ret = -1;
}
- /* stop event thread */
- if (ovs_db_poll_thread_stop(pdb) < 0) {
- OVS_ERROR("stop event thread failed");
- ovs_db_ret = (-1);
- }
+ /* destroy event thread private data */
+ ovs_db_event_thread_data_destroy(pdb);
+
+ pthread_mutex_unlock(&pdb->mutex);
/* unsubscribe callbacks */
ovs_db_callback_remove_all(pdb);
/* close connection */
- if (pdb->sock)
+ if (pdb->sock >= 0)
close(pdb->sock);
/* release DB handler */
- pthread_mutex_unlock(&pdb->mutex);
pthread_mutex_destroy(&pdb->mutex);
sfree(pdb);
return ovs_db_ret;
* Public OVS utils API implementation
*/
-/* Get YAJL value by key from YAJL dictionary */
+/* Get YAJL value by key from YAJL dictionary
+ *
+ * EXAMPLE:
+ * {
+ * "key_a" : <YAJL return value>
+ * "key_b" : <YAJL return value>
+ * }
+ */
yajl_val ovs_utils_get_value_by_key(yajl_val jval, const char *key) {
const char *obj_key = NULL;
return NULL;
/* find a value by key */
- for (int i = 0; i < YAJL_GET_OBJECT(jval)->len; i++) {
+ for (size_t i = 0; i < YAJL_GET_OBJECT(jval)->len; i++) {
obj_key = YAJL_GET_OBJECT(jval)->keys[i];
if (strcmp(obj_key, key) == 0)
return YAJL_GET_OBJECT(jval)->values[i];
return NULL;
}
-/* Get OVS DB map value by given map key */
+/* Get OVS DB map value by given map key
+ *
+ * FROM RFC7047:
+ *
+ * <pair>
+ * A 2-element JSON array that represents a pair within a database
+ * map. The first element is an <atom> that represents the key, and
+ * the second element is an <atom> that represents the value.
+ *
+ * <map>
+ * A 2-element JSON array that represents a database map value. The
+ * first element of the array must be the string "map", and the
+ * second element must be an array of zero or more <pair>s giving the
+ * values in the map. All of the <pair>s must have the same key and
+ * value types.
+ *
+ * EXAMPLE:
+ * [
+ * "map", [
+ * [ "key_a", <YAJL value>], [ "key_b", <YAJL value>], ...
+ * ]
+ * ]
+ */
yajl_val ovs_utils_get_map_value(yajl_val jval, const char *key) {
size_t map_len = 0;
size_t array_len = 0;
/* try to find map value by map key */
map_len = YAJL_GET_ARRAY(array_values[1])->len;
map_values = YAJL_GET_ARRAY(array_values[1])->values;
- for (int i = 0; i < map_len; i++) {
+ for (size_t i = 0; i < map_len; i++) {
/* check YAJL array */
if (!YAJL_IS_ARRAY(map_values[i]))
break;
projects / collectd.git / blobdiff