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Fix tcp server burns cpu cycles when no connections, and does not close some connections

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This commit is contained in:
Johnathon Slightham
2025-12-13 21:55:37 -05:00
parent f769ce3ca0
commit 17606bc98d
3 changed files with 24 additions and 11 deletions
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31
components/rpc/wireless/TCPServer.cpp
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@@ -1,4 +1,3 @@
#include <iostream>
#include <memory>
#include "esp_log.h"
@@ -18,6 +17,8 @@
#define TAG "TCPServer"
#define MIN(X, Y) (((X) < (Y)) ? (X) : (Y))
// todo: - add message routing to correct client
// - authenticate (don't just return true from the auth function)
// - tx from board
@@ -153,15 +154,16 @@ void TCPServer::shutdown() {
int max_fd = -1;
xSemaphoreTake(that->m_mutex, portMAX_DELAY);
if (that->m_clients.size() < 1) {
vTaskDelay(NO_CLIENT_SLEEP_MS / portTICK_PERIOD_MS);
}
for (const auto sock : that->m_clients) {
FD_SET(sock, &readfds);
if (sock > max_fd) max_fd = sock;
}
xSemaphoreGive(that->m_mutex);
// todo: Select seems to be timing out the watchdog, even though we have a 50ms timeout.
// Potentially select is not respecting our timeout?
timeval timeout = {0, 50000}; // 50 ms timeout
timeval timeout = {.tv_sec = 1, .tv_usec = 0}; // 1s timeout
int ret = select(max_fd + 1, &readfds, nullptr, nullptr, &timeout);
vTaskDelay(0); // Avoid starving other threads
@@ -172,17 +174,25 @@ void TCPServer::shutdown() {
for (int sock : that->m_clients) {
vTaskDelay(0); // Avoid starving other threads
if (FD_ISSET(sock, &readfds)) {
// Handle socket
auto buffer = std::make_unique<std::vector<uint8_t>>();
buffer->resize(MAX_RX_BUFFER_SIZE);
uint32_t msg_size = 0;
recv(sock, &msg_size, 4, MSG_WAITALL);
if (msg_size < 1 || msg_size > 512) {
if (int len = recv(sock, &msg_size, 4, MSG_WAITALL); len < 0) {
ESP_LOGE(TAG, "Error occurred during receiving msg length: errno %d\n", errno);
to_remove.emplace_back(sock);
continue;
} else if (0 == len) {
ESP_LOGI(TAG, "TCP Connection closed when receiving msg length\n");
close(sock);
to_remove.emplace_back(sock);
continue;
}
ESP_LOGD(TAG, "Message size: %ld\n", msg_size);
if (msg_size < 1 || msg_size > MAX_RX_BUFFER_SIZE) {
continue;
}
auto buffer = std::make_unique<std::vector<uint8_t>>();
buffer->resize(MIN(MAX_RX_BUFFER_SIZE, msg_size));
if (int len = recv(sock, buffer->data(), msg_size, MSG_WAITALL); len < 0) {
ESP_LOGE(TAG, "Error occurred during receiving: errno %d\n", errno);
@@ -251,4 +261,3 @@ int TCPServer::send_msg(char *buffer, const uint32_t length) const {
return 0;
}