esp-idf/components/tcp_transport/test/test_transport_fixtures.c

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#include "unity.h"
#include "esp_transport.h"
#include "esp_transport_tcp.h"
#include "test_utils.h"
#include "esp_log.h"
#include "lwip/err.h"
#include "lwip/sockets.h"
#include "freertos/event_groups.h"
#include "tcp_transport_fixtures.h"
#include "unity_test_utils.h"
#define LISTENER_TASK_PRIORITY (UNITY_FREERTOS_PRIORITY+1)
#define CONNECT_TASK_PRIORITY (LISTENER_TASK_PRIORITY+1)
#define CONNECT_TASK_PRIORITY_LOWER (LISTENER_TASK_PRIORITY-2)
// This is a private API of the tcp transport, but needed for socket operation tests
int esp_transport_get_socket(esp_transport_handle_t t);
/**
* @brief Event flags for synchronization between the listener task, the connection task and the test task
*/
enum {
TCP_CONNECT_DONE = 1 << 0, /*!< Indicates that the connection task has finished, so the transport_connect() exited */
TCP_LISTENER_DONE = 1 << 1, /*!< Indicates that the listener task has finished either with success for failure */
TCP_TEST_DONE = 1 << 2, /*!< Indicates that the test case finished, test tear-down() called */
TCP_LISTENER_READY = 1 << 3, /*!< Indicates that the listener task is ready to accept connections */
TCP_LISTENER_ACCEPTED = 1 << 4, /*!< Indicates that the listener task has accepted a connection (from transport_connect()) */
};
/**
* @brief Connection test configuration parameters
*/
struct tcp_connect_test_config {
esp_transport_handle_t transport_under_test;
bool accept_connection;
bool consume_sock_backlog;
bool connect_async;
int timeout_ms;
int port;
bool connect_task_prio_lower;
};
/**
* @brief Test setup structure containing all the info needed for the connection tests
*/
struct tcp_connect_test_storage {
struct tcp_connect_test_config config;
TickType_t max_wait;
EventGroupHandle_t tcp_connect_done;
int connect_return_value;
int listen_sock;
int accepted_sock;
int last_connect_sock;
bool tcp_listener_failed;
TaskHandle_t listener_task;
TaskHandle_t tcp_connect_task;
};
typedef struct tcp_connect_test_storage *tcp_connect_test_t;
/**
* @brief Recursively connects with a new socket to loopback interface until the last one blocks.
* The last socket is closed upon test teardown, that initiates recursive cleanup (close) for all
* active/connected sockets.
*/
static void connect_once(struct tcp_connect_test_storage *storage)
{
struct sockaddr_in dest_addr_ip4 = { .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
.sin_family = AF_INET,
.sin_port = htons(storage->config.port) };
int connect_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (connect_sock < 0) {
storage->tcp_listener_failed = true;
return;
}
storage->last_connect_sock = connect_sock;
int err = connect(connect_sock, (struct sockaddr *)&dest_addr_ip4, sizeof(dest_addr_ip4));
if (err != 0) {
// The last connection is expected to fail here, since the both sockets get closed on test cleanup
return;
}
connect_once(storage);
close(connect_sock);
}
/**
* @brief creates a listener (and an acceptor if configured)
*
* if consume_sock_backlog set: connect as many times as possible to prepare an endpoint which
* would make the client block but not complete TCP handshake
*
* if accept_connection set: waiting normally for connection creating an acceptor to mimic tcp-transport endpoint
*/
static void localhost_listener(void *pvParameters)
{
const char* TAG = "tcp_transport_test";
struct tcp_connect_test_storage *storage = pvParameters;
struct sockaddr_in dest_addr_ip4 = { .sin_addr.s_addr = htonl(INADDR_ANY),
.sin_family = AF_INET,
.sin_port = htons(storage->config.port) };
// Create listener socket and bind it to ANY address
storage->listen_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
int opt = 1;
setsockopt(storage->listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if (storage->listen_sock < 0) {
ESP_LOGE(TAG, "Unable to create socket");
storage->tcp_listener_failed = true;
goto failed;
}
int err = bind(storage->listen_sock, (struct sockaddr *)&dest_addr_ip4, sizeof(dest_addr_ip4));
if (err != 0) {
ESP_LOGE(TAG, "Socket unable to bind: errno %d", errno);
storage->tcp_listener_failed = true;
goto failed;
}
// Listen with backlog set to a low number
err = listen(storage->listen_sock, 4);
if (err != 0) {
ESP_LOGE(TAG, "Error occurred during listen: errno %d", errno);
storage->tcp_listener_failed = true;
goto failed;
}
// Listener is ready at this point
xEventGroupSetBits(storage->tcp_connect_done, TCP_LISTENER_READY);
if (storage->config.consume_sock_backlog) {
// Ideally we would set backlog to 0, but since this is an implementation specific recommendation parameter,
// we recursively create sockets and try to connect to this listener in order to consume the backlog. After
// the backlog is consumed, the last connection blocks (waiting for accept), but at that point we are sure
// that any other connection would also block
connect_once(storage);
} else if (storage->config.accept_connection) {
struct sockaddr_storage source_addr;
socklen_t addr_len = sizeof(source_addr);
storage->accepted_sock = accept(storage->listen_sock, (struct sockaddr *)&source_addr, &addr_len);
if (storage->accepted_sock < 0) {
ESP_LOGE(TAG, "Unable to accept connection: errno %d", errno);
goto failed;
}
xEventGroupSetBits(storage->tcp_connect_done, TCP_LISTENER_ACCEPTED); // Mark the socket as accepted
// ...and wait for the "acceptor" tests to finish
xEventGroupWaitBits(storage->tcp_connect_done, TCP_TEST_DONE, true, true, storage->config.timeout_ms * 10);
}
failed:
xEventGroupSetBits(storage->tcp_connect_done, TCP_LISTENER_DONE);
vTaskSuspend(NULL);
}
/**
* @brief This task simply tries to connect to localhost (server provided by listner's task) using tcp_transport
*/
static void tcp_connect_task(void *pvParameters)
{
struct tcp_connect_test_storage *storage = pvParameters;
int (*connect_fn)(esp_transport_handle_t, const char *, int, int) =
storage->config.connect_async ? esp_transport_connect_async : esp_transport_connect;
storage->connect_return_value = connect_fn(storage->config.transport_under_test, "localhost", storage->config.port, storage->config.timeout_ms);
if (storage->config.accept_connection) {
// If we test the accepted connection, need to wait until the test completes
xEventGroupWaitBits(storage->tcp_connect_done, TCP_TEST_DONE, true, true, storage->config.timeout_ms * 10);
}
xEventGroupSetBits(storage->tcp_connect_done, TCP_CONNECT_DONE);
vTaskSuspend(NULL);
}
static inline void close_if_valid(int *s)
{
if (*s >= 0) {
close(*s);
*s = -1;
}
}
/**
* @brief Connect test setup function
*
* Creates the Test storage, configures it accordingly and starts two tasks
* * localhost_listener -- to provide a simple server endpoint for the transport layers to connect to
* * tcp_connect_task -- to perform the connection
*/
static tcp_connect_test_t connect_test_setup(struct tcp_connect_test_config *config)
{
tcp_connect_test_t t = calloc(1, sizeof(struct tcp_connect_test_storage));
if (!t) {
return NULL;
}
memcpy(&t->config, config, sizeof(struct tcp_connect_test_config));
t->tcp_connect_done = xEventGroupCreate();
if (!t->tcp_connect_done) {
return NULL;
}
t->max_wait = pdMS_TO_TICKS(config->timeout_ms * 10);
t->listen_sock = t->last_connect_sock = t->accepted_sock = -1; // mark all sockets invalid
test_case_uses_tcpip();
// Create listener task
xTaskCreatePinnedToCore(localhost_listener, "localhost_listener", 4096, t, LISTENER_TASK_PRIORITY, &t->listener_task, 0);
xEventGroupWaitBits(t->tcp_connect_done, TCP_LISTENER_READY, true, true, t->max_wait);
// Perform tcp-connect in a separate task to check asynchronously for the timeout or to connect (depends on the test config)
xTaskCreatePinnedToCore(tcp_connect_task, "tcp_connect_task", 4096, t,
config->connect_task_prio_lower? CONNECT_TASK_PRIORITY_LOWER : CONNECT_TASK_PRIORITY, &t->tcp_connect_task, 0);
return t;
}
/**
* @brief Destroys and cleans out the test environment
*/
static void connect_test_teardown(tcp_connect_test_t t)
{
// Mark the test done and wait for the listener to check if finished with no issues
xEventGroupSetBits(t->tcp_connect_done, TCP_TEST_DONE);
xEventGroupWaitBits(t->tcp_connect_done, TCP_LISTENER_DONE, true, true, t->max_wait);
TEST_ASSERT_EQUAL(false, t->tcp_listener_failed);
// Closing both parties of the last "blocking" connection to unwind localhost_listener() and let other connected sockets closed
close_if_valid(&t->listen_sock);
close_if_valid(&t->last_connect_sock);
close_if_valid(&t->accepted_sock);
// Cleanup
vTaskSuspend(t->tcp_connect_task);
vTaskSuspend(t->listener_task);
vEventGroupDelete(t->tcp_connect_done);
unity_utils_task_delete(t->tcp_connect_task);
unity_utils_task_delete(t->listener_task);
free(t);
}
/**
* @brief Utility function for testing timeouts for different transports
*/
void tcp_transport_test_connection_timeout(esp_transport_handle_t transport_under_test)
{
struct tcp_connect_test_config params = {
.timeout_ms = 200,
.port = 80,
.consume_sock_backlog = true,
.connect_async = false,
.transport_under_test = transport_under_test,
.connect_task_prio_lower = true
};
tcp_connect_test_t test = connect_test_setup(&params);
TEST_ASSERT_NOT_NULL(test);
// Roughly measure tick-time spent while trying to connect
#if !CONFIG_FREERTOS_SMP // IDF-5225 - timeout is several times shorter than expected, probably not measured correctly
TickType_t start = xTaskGetTickCount();
#endif
EventBits_t bits = xEventGroupWaitBits(test->tcp_connect_done, TCP_CONNECT_DONE, true, true, test->max_wait);
#if !CONFIG_FREERTOS_SMP // IDF-5225 - timeout is several times shorter than expected, probably not measured correctly
TickType_t end = xTaskGetTickCount();
#endif
TEST_ASSERT_EQUAL(TCP_CONNECT_DONE, TCP_CONNECT_DONE & bits); // Connection has finished
#if !CONFIG_FREERTOS_SMP // IDF-5225 - timeout is several times shorter than expected, probably not measured correctly
TEST_ASSERT_EQUAL(-1, test->connect_return_value); // Connection failed with -1
// Test connection attempt took expected timeout value
TEST_ASSERT_INT_WITHIN(pdMS_TO_TICKS(params.timeout_ms/5), pdMS_TO_TICKS(params.timeout_ms), end-start);
#endif
// Close the last bound connection, to recursively unwind the consumed backlog
close_if_valid(&test->last_connect_sock);
connect_test_teardown(test);
}
/**
* @brief Utility function for testing timeouts for different transports, options and both sync and async connection
*/
void tcp_transport_test_socket_options(esp_transport_handle_t transport_under_test, bool async,
const struct expected_sock_option *expected_opts, size_t sock_options_len)
{
struct tcp_connect_test_config params = {
.timeout_ms = 200,
.port = 80,
.accept_connection = true,
.consume_sock_backlog = false,
.transport_under_test = transport_under_test,
.connect_async = async,
.connect_task_prio_lower = false
};
tcp_connect_test_t test = connect_test_setup(&params);
TEST_ASSERT_NOT_NULL(test);
// Wait till the connection gets accepted to get the client's socket
xEventGroupWaitBits(test->tcp_connect_done, TCP_LISTENER_ACCEPTED, true, true, test->max_wait);
int sock = esp_transport_get_socket(params.transport_under_test);
for (int i=0; i<sock_options_len; ++i) {
int value = -1;
socklen_t optlen = (socklen_t)sizeof(value);
TEST_ASSERT_EQUAL(getsockopt(sock, expected_opts[i].level, expected_opts[i].optname,
(void*)&value, &optlen), 0);
if (expected_opts[i].opttype == SOCK_OPT_TYPE_BOOL) {
TEST_ASSERT_EQUAL((bool)value, (bool) expected_opts[i].optval);
} else if (expected_opts[i].opttype == SOCK_OPT_TYPE_INT) {
TEST_ASSERT_EQUAL(value, expected_opts[i].optval);
} else {
TEST_FAIL_MESSAGE("Unsupported socket option type");
}
}
// close the tcp_transport's socket so we don't have to wait for connection timeout
close(sock);
connect_test_teardown(test);
}