603 lines
21 KiB
C
603 lines
21 KiB
C
// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdio.h>
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#include "esp_websocket_client.h"
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#include "esp_transport.h"
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#include "esp_transport_tcp.h"
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#include "esp_transport_ssl.h"
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#include "esp_transport_ws.h"
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/* using uri parser */
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#include "http_parser.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "freertos/queue.h"
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#include "freertos/event_groups.h"
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#include "esp_log.h"
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#include "esp_timer.h"
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static const char *TAG = "WEBSOCKET_CLIENT";
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#define WEBSOCKET_TCP_DEFAULT_PORT (80)
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#define WEBSOCKET_SSL_DEFAULT_PORT (443)
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#define WEBSOCKET_BUFFER_SIZE_BYTE (1024)
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#define WEBSOCKET_RECONNECT_TIMEOUT_MS (10*1000)
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#define WEBSOCKET_TASK_PRIORITY (5)
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#define WEBSOCKET_TASK_STACK (4*1024)
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#define WEBSOCKET_NETWORK_TIMEOUT_MS (10*1000)
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#define WEBSOCKET_PING_TIMEOUT_MS (10*1000)
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#define WEBSOCKET_EVENT_QUEUE_SIZE (1)
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#define WEBSOCKET_SEND_EVENT_TIMEOUT_MS (1000/portTICK_RATE_MS)
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#define ESP_WS_CLIENT_MEM_CHECK(TAG, a, action) if (!(a)) { \
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ESP_LOGE(TAG,"%s:%d (%s): %s", __FILE__, __LINE__, __FUNCTION__, "Memory exhausted"); \
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action; \
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}
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const static int STOPPED_BIT = BIT0;
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ESP_EVENT_DEFINE_BASE(WEBSOCKET_EVENTS);
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typedef struct {
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int task_stack;
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int task_prio;
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char *uri;
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char *host;
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char *path;
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char *scheme;
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char *username;
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char *password;
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int port;
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bool auto_reconnect;
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void *user_context;
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int network_timeout_ms;
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char *subprotocol;
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} websocket_config_storage_t;
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typedef enum {
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WEBSOCKET_STATE_ERROR = -1,
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WEBSOCKET_STATE_UNKNOW = 0,
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WEBSOCKET_STATE_INIT,
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WEBSOCKET_STATE_CONNECTED,
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WEBSOCKET_STATE_WAIT_TIMEOUT,
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} websocket_client_state_t;
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struct esp_websocket_client {
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esp_event_loop_handle_t event_handle;
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esp_transport_list_handle_t transport_list;
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esp_transport_handle_t transport;
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websocket_config_storage_t *config;
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websocket_client_state_t state;
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uint64_t keepalive_tick_ms;
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uint64_t reconnect_tick_ms;
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uint64_t ping_tick_ms;
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int wait_timeout_ms;
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int auto_reconnect;
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bool run;
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EventGroupHandle_t status_bits;
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xSemaphoreHandle lock;
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char *rx_buffer;
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char *tx_buffer;
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int buffer_size;
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};
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static uint64_t _tick_get_ms(void)
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{
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return esp_timer_get_time()/1000;
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}
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static esp_err_t esp_websocket_client_dispatch_event(esp_websocket_client_handle_t client,
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esp_websocket_event_id_t event,
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const char *data,
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int data_len)
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{
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esp_err_t err;
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esp_websocket_event_data_t event_data;
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event_data.data_ptr = data;
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event_data.data_len = data_len;
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if ((err = esp_event_post_to(client->event_handle,
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WEBSOCKET_EVENTS, event,
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&event_data,
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sizeof(esp_websocket_event_data_t),
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WEBSOCKET_SEND_EVENT_TIMEOUT_MS)) != ESP_OK) {
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return err;
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}
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return esp_event_loop_run(client->event_handle, WEBSOCKET_SEND_EVENT_TIMEOUT_MS);
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}
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static esp_err_t esp_websocket_client_abort_connection(esp_websocket_client_handle_t client)
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{
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esp_transport_close(client->transport);
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client->wait_timeout_ms = WEBSOCKET_RECONNECT_TIMEOUT_MS;
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client->reconnect_tick_ms = _tick_get_ms();
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client->state = WEBSOCKET_STATE_WAIT_TIMEOUT;
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ESP_LOGI(TAG, "Reconnect after %d ms", client->wait_timeout_ms);
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esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_DISCONNECTED, NULL, 0);
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return ESP_OK;
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}
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static esp_err_t esp_websocket_client_set_config(esp_websocket_client_handle_t client, const esp_websocket_client_config_t *config)
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{
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websocket_config_storage_t *cfg = client->config;
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cfg->task_prio = config->task_prio;
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if (cfg->task_prio <= 0) {
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cfg->task_prio = WEBSOCKET_TASK_PRIORITY;
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}
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cfg->task_stack = config->task_stack;
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if (cfg->task_stack == 0) {
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cfg->task_stack = WEBSOCKET_TASK_STACK;
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}
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if (config->host) {
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cfg->host = strdup(config->host);
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ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->host, return ESP_ERR_NO_MEM);
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}
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if (config->port) {
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cfg->port = config->port;
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}
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if (config->username) {
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free(cfg->username);
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cfg->username = strdup(config->username);
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ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->username, return ESP_ERR_NO_MEM);
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}
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if (config->password) {
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free(cfg->password);
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cfg->password = strdup(config->password);
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ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->password, return ESP_ERR_NO_MEM);
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}
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if (config->uri) {
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free(cfg->uri);
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cfg->uri = strdup(config->uri);
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ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->uri, return ESP_ERR_NO_MEM);
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}
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if (config->path) {
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free(cfg->path);
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cfg->path = strdup(config->path);
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ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->path, return ESP_ERR_NO_MEM);
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}
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if (config->subprotocol) {
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free(cfg->subprotocol);
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cfg->subprotocol = strdup(config->subprotocol);
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ESP_WS_CLIENT_MEM_CHECK(TAG, cfg->subprotocol, return ESP_ERR_NO_MEM);
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}
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cfg->network_timeout_ms = WEBSOCKET_NETWORK_TIMEOUT_MS;
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cfg->user_context = config->user_context;
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cfg->auto_reconnect = true;
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if (config->disable_auto_reconnect) {
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cfg->auto_reconnect = false;
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}
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return ESP_OK;
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}
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static esp_err_t esp_websocket_client_destroy_config(esp_websocket_client_handle_t client)
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{
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if (client == NULL) {
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return ESP_ERR_INVALID_ARG;
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}
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websocket_config_storage_t *cfg = client->config;
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if (client->config == NULL) {
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return ESP_ERR_INVALID_ARG;
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}
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free(cfg->host);
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free(cfg->uri);
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free(cfg->path);
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free(cfg->scheme);
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free(cfg->username);
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free(cfg->password);
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free(cfg->subprotocol);
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memset(cfg, 0, sizeof(websocket_config_storage_t));
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free(client->config);
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client->config = NULL;
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return ESP_OK;
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}
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static void set_websocket_transport_optional_settings(esp_websocket_client_handle_t client, esp_transport_handle_t trans)
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{
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if (trans && client->config->path) {
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esp_transport_ws_set_path(trans, client->config->path);
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}
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if (trans && client->config->subprotocol) {
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esp_transport_ws_set_subprotocol(trans, client->config->subprotocol);
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}
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}
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esp_websocket_client_handle_t esp_websocket_client_init(const esp_websocket_client_config_t *config)
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{
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esp_websocket_client_handle_t client = calloc(1, sizeof(struct esp_websocket_client));
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ESP_WS_CLIENT_MEM_CHECK(TAG, client, return NULL);
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esp_event_loop_args_t event_args = {
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.queue_size = WEBSOCKET_EVENT_QUEUE_SIZE,
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.task_name = NULL // no task will be created
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};
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if (esp_event_loop_create(&event_args, &client->event_handle) != ESP_OK) {
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ESP_LOGE(TAG, "Error create event handler for websocket client");
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free(client);
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return NULL;
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}
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client->lock = xSemaphoreCreateMutex();
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->lock, goto _websocket_init_fail);
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client->config = calloc(1, sizeof(websocket_config_storage_t));
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config, goto _websocket_init_fail);
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client->transport_list = esp_transport_list_init();
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->transport_list, goto _websocket_init_fail);
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esp_transport_handle_t tcp = esp_transport_tcp_init();
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ESP_WS_CLIENT_MEM_CHECK(TAG, tcp, goto _websocket_init_fail);
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esp_transport_set_default_port(tcp, WEBSOCKET_TCP_DEFAULT_PORT);
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esp_transport_list_add(client->transport_list, tcp, "_tcp"); // need to save to transport list, for cleanup
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esp_transport_handle_t ws = esp_transport_ws_init(tcp);
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ESP_WS_CLIENT_MEM_CHECK(TAG, ws, goto _websocket_init_fail);
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esp_transport_set_default_port(ws, WEBSOCKET_TCP_DEFAULT_PORT);
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esp_transport_list_add(client->transport_list, ws, "ws");
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if (config->transport == WEBSOCKET_TRANSPORT_OVER_TCP) {
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asprintf(&client->config->scheme, "ws");
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
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}
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esp_transport_handle_t ssl = esp_transport_ssl_init();
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ESP_WS_CLIENT_MEM_CHECK(TAG, ssl, goto _websocket_init_fail);
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esp_transport_set_default_port(ssl, WEBSOCKET_SSL_DEFAULT_PORT);
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if (config->cert_pem) {
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esp_transport_ssl_set_cert_data(ssl, config->cert_pem, strlen(config->cert_pem));
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}
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esp_transport_list_add(client->transport_list, ssl, "_ssl"); // need to save to transport list, for cleanup
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esp_transport_handle_t wss = esp_transport_ws_init(ssl);
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ESP_WS_CLIENT_MEM_CHECK(TAG, wss, goto _websocket_init_fail);
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esp_transport_set_default_port(wss, WEBSOCKET_SSL_DEFAULT_PORT);
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esp_transport_list_add(client->transport_list, wss, "wss");
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if (config->transport == WEBSOCKET_TRANSPORT_OVER_SSL) {
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asprintf(&client->config->scheme, "wss");
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
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}
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if (config->uri) {
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if (esp_websocket_client_set_uri(client, config->uri) != ESP_OK) {
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ESP_LOGE(TAG, "Invalid uri");
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goto _websocket_init_fail;
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}
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}
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if (esp_websocket_client_set_config(client, config) != ESP_OK) {
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ESP_LOGE(TAG, "Failed to set the configuration");
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goto _websocket_init_fail;
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}
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if (client->config->scheme == NULL) {
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asprintf(&client->config->scheme, "ws");
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, goto _websocket_init_fail);
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}
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set_websocket_transport_optional_settings(client, esp_transport_list_get_transport(client->transport_list, "ws"));
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set_websocket_transport_optional_settings(client, esp_transport_list_get_transport(client->transport_list, "wss"));
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client->keepalive_tick_ms = _tick_get_ms();
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client->reconnect_tick_ms = _tick_get_ms();
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client->ping_tick_ms = _tick_get_ms();
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int buffer_size = config->buffer_size;
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if (buffer_size <= 0) {
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buffer_size = WEBSOCKET_BUFFER_SIZE_BYTE;
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}
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client->rx_buffer = malloc(buffer_size);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->rx_buffer, {
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goto _websocket_init_fail;
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});
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client->tx_buffer = malloc(buffer_size);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->tx_buffer, {
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goto _websocket_init_fail;
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});
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client->status_bits = xEventGroupCreate();
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->status_bits, {
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goto _websocket_init_fail;
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});
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client->buffer_size = buffer_size;
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return client;
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_websocket_init_fail:
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esp_websocket_client_destroy(client);
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return NULL;
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}
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esp_err_t esp_websocket_client_destroy(esp_websocket_client_handle_t client)
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{
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if (client == NULL) {
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return ESP_ERR_INVALID_ARG;
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}
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if (client->run) {
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esp_websocket_client_stop(client);
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}
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if (client->event_handle) {
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esp_event_loop_delete(client->event_handle);
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}
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esp_websocket_client_destroy_config(client);
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esp_transport_list_destroy(client->transport_list);
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vQueueDelete(client->lock);
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free(client->tx_buffer);
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free(client->rx_buffer);
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if (client->status_bits) {
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vEventGroupDelete(client->status_bits);
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}
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free(client);
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client = NULL;
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return ESP_OK;
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}
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esp_err_t esp_websocket_client_set_uri(esp_websocket_client_handle_t client, const char *uri)
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{
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if (client == NULL || uri == NULL) {
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return ESP_ERR_INVALID_ARG;
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}
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struct http_parser_url puri;
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http_parser_url_init(&puri);
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int parser_status = http_parser_parse_url(uri, strlen(uri), 0, &puri);
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if (parser_status != 0) {
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ESP_LOGE(TAG, "Error parse uri = %s", uri);
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return ESP_FAIL;
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}
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if (puri.field_data[UF_SCHEMA].len) {
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free(client->config->scheme);
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asprintf(&client->config->scheme, "%.*s", puri.field_data[UF_SCHEMA].len, uri + puri.field_data[UF_SCHEMA].off);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->scheme, return ESP_ERR_NO_MEM);
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}
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if (puri.field_data[UF_HOST].len) {
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free(client->config->host);
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asprintf(&client->config->host, "%.*s", puri.field_data[UF_HOST].len, uri + puri.field_data[UF_HOST].off);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->host, return ESP_ERR_NO_MEM);
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}
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if (puri.field_data[UF_PATH].len) {
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free(client->config->path);
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asprintf(&client->config->path, "%.*s", puri.field_data[UF_PATH].len, uri + puri.field_data[UF_PATH].off);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->path, return ESP_ERR_NO_MEM);
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}
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if (puri.field_data[UF_PORT].off) {
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client->config->port = strtol((const char*)(uri + puri.field_data[UF_PORT].off), NULL, 10);
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}
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if (puri.field_data[UF_USERINFO].len) {
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char *user_info = NULL;
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asprintf(&user_info, "%.*s", puri.field_data[UF_USERINFO].len, uri + puri.field_data[UF_USERINFO].off);
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if (user_info) {
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char *pass = strchr(user_info, ':');
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if (pass) {
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pass[0] = 0; //terminal username
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pass ++;
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free(client->config->password);
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client->config->password = strdup(pass);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->password, return ESP_ERR_NO_MEM);
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}
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free(client->config->username);
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client->config->username = strdup(user_info);
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ESP_WS_CLIENT_MEM_CHECK(TAG, client->config->username, return ESP_ERR_NO_MEM);
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free(user_info);
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} else {
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return ESP_ERR_NO_MEM;
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}
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}
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return ESP_OK;
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}
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static void esp_websocket_client_task(void *pv)
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{
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int rlen;
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esp_websocket_client_handle_t client = (esp_websocket_client_handle_t) pv;
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client->run = true;
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//get transport by scheme
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client->transport = esp_transport_list_get_transport(client->transport_list, client->config->scheme);
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if (client->transport == NULL) {
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ESP_LOGE(TAG, "There are no transports valid, stop websocket client");
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client->run = false;
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}
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//default port
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if (client->config->port == 0) {
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client->config->port = esp_transport_get_default_port(client->transport);
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}
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client->state = WEBSOCKET_STATE_INIT;
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xEventGroupClearBits(client->status_bits, STOPPED_BIT);
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int read_select;
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while (client->run) {
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switch ((int)client->state) {
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case WEBSOCKET_STATE_INIT:
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if (client->transport == NULL) {
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ESP_LOGE(TAG, "There are no transport");
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client->run = false;
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break;
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}
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if (esp_transport_connect(client->transport,
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client->config->host,
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client->config->port,
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client->config->network_timeout_ms) < 0) {
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ESP_LOGE(TAG, "Error transport connect");
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esp_websocket_client_abort_connection(client);
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break;
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}
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ESP_LOGD(TAG, "Transport connected to %s://%s:%d", client->config->scheme, client->config->host, client->config->port);
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client->state = WEBSOCKET_STATE_CONNECTED;
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esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_CONNECTED, NULL, 0);
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break;
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case WEBSOCKET_STATE_CONNECTED:
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|
read_select = esp_transport_poll_read(client->transport, 1000); //Poll every 1000ms
|
|
if (read_select < 0) {
|
|
ESP_LOGE(TAG, "Network error, errorno");
|
|
esp_websocket_client_abort_connection(client);
|
|
break;
|
|
}
|
|
if (_tick_get_ms() - client->ping_tick_ms > WEBSOCKET_PING_TIMEOUT_MS) {
|
|
client->ping_tick_ms = _tick_get_ms();
|
|
// Send PING
|
|
esp_transport_write(client->transport, NULL, 0, client->config->network_timeout_ms);
|
|
}
|
|
if (read_select == 0) {
|
|
ESP_LOGD(TAG, "Timeout...");
|
|
continue;
|
|
}
|
|
client->ping_tick_ms = _tick_get_ms();
|
|
|
|
rlen = esp_transport_read(client->transport, client->rx_buffer, client->buffer_size, client->config->network_timeout_ms);
|
|
if (rlen < 0) {
|
|
ESP_LOGE(TAG, "Error read data");
|
|
esp_websocket_client_abort_connection(client);
|
|
break;
|
|
}
|
|
if (rlen > 0) {
|
|
esp_websocket_client_dispatch_event(client, WEBSOCKET_EVENT_DATA, client->rx_buffer, rlen);
|
|
}
|
|
break;
|
|
case WEBSOCKET_STATE_WAIT_TIMEOUT:
|
|
|
|
if (!client->config->auto_reconnect) {
|
|
client->run = false;
|
|
break;
|
|
}
|
|
if (_tick_get_ms() - client->reconnect_tick_ms > client->wait_timeout_ms) {
|
|
client->state = WEBSOCKET_STATE_INIT;
|
|
client->reconnect_tick_ms = _tick_get_ms();
|
|
ESP_LOGD(TAG, "Reconnecting...");
|
|
}
|
|
vTaskDelay(client->wait_timeout_ms / 2 / portTICK_RATE_MS);
|
|
break;
|
|
}
|
|
}
|
|
|
|
esp_transport_close(client->transport);
|
|
xEventGroupSetBits(client->status_bits, STOPPED_BIT);
|
|
client->state = WEBSOCKET_STATE_UNKNOW;
|
|
vTaskDelete(NULL);
|
|
}
|
|
|
|
esp_err_t esp_websocket_client_start(esp_websocket_client_handle_t client)
|
|
{
|
|
if (client == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
if (client->state >= WEBSOCKET_STATE_INIT) {
|
|
ESP_LOGE(TAG, "The client has started");
|
|
return ESP_FAIL;
|
|
}
|
|
if (xTaskCreate(esp_websocket_client_task, "websocket_task", client->config->task_stack, client, client->config->task_prio, NULL) != pdTRUE) {
|
|
ESP_LOGE(TAG, "Error create websocket task");
|
|
return ESP_FAIL;
|
|
}
|
|
xEventGroupClearBits(client->status_bits, STOPPED_BIT);
|
|
return ESP_OK;
|
|
}
|
|
|
|
esp_err_t esp_websocket_client_stop(esp_websocket_client_handle_t client)
|
|
{
|
|
if (client == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
if (!client->run) {
|
|
ESP_LOGW(TAG, "Client was not started");
|
|
return ESP_FAIL;
|
|
}
|
|
client->run = false;
|
|
xEventGroupWaitBits(client->status_bits, STOPPED_BIT, false, true, portMAX_DELAY);
|
|
client->state = WEBSOCKET_STATE_UNKNOW;
|
|
return ESP_OK;
|
|
}
|
|
|
|
int esp_websocket_client_send(esp_websocket_client_handle_t client, const char *data, int len, TickType_t timeout)
|
|
{
|
|
int need_write = len;
|
|
int wlen = 0, widx = 0;
|
|
|
|
if (client == NULL || data == NULL || len <= 0) {
|
|
ESP_LOGE(TAG, "Invalid arguments");
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
if (!esp_websocket_client_is_connected(client)) {
|
|
ESP_LOGE(TAG, "Websocket client is not connected");
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
if (client->transport == NULL) {
|
|
ESP_LOGE(TAG, "Invalid transport");
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
if (xSemaphoreTake(client->lock, timeout) != pdPASS) {
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
while (widx < len) {
|
|
if (need_write > client->buffer_size) {
|
|
need_write = client->buffer_size;
|
|
}
|
|
memcpy(client->tx_buffer, data + widx, need_write);
|
|
wlen = esp_transport_write(client->transport,
|
|
(char *)client->tx_buffer,
|
|
need_write,
|
|
client->config->network_timeout_ms);
|
|
if (wlen <= 0) {
|
|
xSemaphoreGive(client->lock);
|
|
return wlen;
|
|
}
|
|
widx += wlen;
|
|
need_write = len - widx;
|
|
}
|
|
xSemaphoreGive(client->lock);
|
|
return widx;
|
|
}
|
|
|
|
bool esp_websocket_client_is_connected(esp_websocket_client_handle_t client)
|
|
{
|
|
if (client == NULL) {
|
|
return false;
|
|
}
|
|
return client->state == WEBSOCKET_STATE_CONNECTED;
|
|
}
|
|
|
|
esp_err_t esp_websocket_register_events(esp_websocket_client_handle_t client,
|
|
esp_websocket_event_id_t event,
|
|
esp_event_handler_t event_handler,
|
|
void* event_handler_arg) {
|
|
if (client == NULL) {
|
|
return ESP_ERR_INVALID_ARG;
|
|
}
|
|
return esp_event_handler_register_with(client->event_handle, WEBSOCKET_EVENTS, event, event_handler, event_handler_arg);
|
|
}
|