Fix crashing, display cs and fonts for cnc pendant

include/moonraker.h

@@ -0,0 +1,148 @@
+#pragma once
+// Moonraker client for mcu-cnc-pendant on its own FreeRTOS task: esp_http_client blocks
+// (DNS is not bounded by timeout_ms), so the main loop only queues commands and reads
+// the last polled status. An unreachable Klipper shows as "offline" instead of starving
+// the loop into the task watchdog.
+
+#include <deque>
+#include <mutex>
+#include <string>
+
+#include "esp_http_client.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "esphome/components/json/json_util.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/log.h"
+
+namespace moonraker {
+
+struct Status {
+  float pos[3]{};
+  std::string homed;
+  std::string state{"offline"};
+};
+
+class Client {
+ public:
+  void start(const char *base) {
+    this->base_ = base;
+    xTaskCreate(task, "moonraker", 6144, this, 1, nullptr);
+  }
+
+  // Run G-code; dropped when Klipper is not keeping up.
+  void gcode(const std::string &script) {
+    JsonDocument doc;
+    doc["script"] = script;
+    std::string body;
+    serializeJson(doc, body);
+    this->post("/printer/gcode/script", body);
+  }
+
+  // urgent: throw away everything queued and send this first (emergency stop)
+  void post(const std::string &path, const std::string &body = "", bool urgent = false) {
+    std::lock_guard<std::mutex> lock(this->mutex_);
+    if (urgent) {
+      this->queue_.clear();
+    } else if (this->queue_.size() >= MAX_QUEUE) {
+      return;
+    }
+    this->queue_.emplace_back(path, body);
+  }
+
+  Status status() {
+    std::lock_guard<std::mutex> lock(this->mutex_);
+    return this->status_;
+  }
+
+ protected:
+  static constexpr size_t MAX_QUEUE = 8;
+  static constexpr uint32_t POLL_MS = 250;
+  static constexpr int TIMEOUT_MS = 1000;
+
+  static void task(void *arg) {
+    auto *self = static_cast<Client *>(arg);
+    uint32_t last_poll = 0;
+    for (;;) {
+      std::pair<std::string, std::string> cmd;
+      bool have_cmd = false;
+      {
+        std::lock_guard<std::mutex> lock(self->mutex_);
+        if (!self->queue_.empty()) {
+          cmd = std::move(self->queue_.front());
+          self->queue_.pop_front();
+          have_cmd = true;
+        }
+      }
+      if (have_cmd) {
+        int code = self->request(cmd.first, &cmd.second, nullptr);
+        if (code != 200)
+          ESP_LOGW("moonraker", "POST %s failed (%d): %s", cmd.first.c_str(), code, cmd.second.c_str());
+        continue;  // drain commands before the next poll
+      }
+      if (esphome::millis() - last_poll >= POLL_MS) {
+        last_poll = esphome::millis();
+        self->poll();
+      }
+      vTaskDelay(pdMS_TO_TICKS(10));
+    }
+  }
+
+  void poll() {
+    std::string body;
+    Status s;
+    if (this->request("/printer/objects/query?gcode_move=gcode_position&toolhead=homed_axes&print_stats=state",
+                      nullptr, &body) == 200) {
+      auto doc = esphome::json::parse_json(body);
+      JsonObject st = doc["result"]["status"];
+      JsonArray p = st["gcode_move"]["gcode_position"];
+      for (int i = 0; i < 3; i++)
+        s.pos[i] = p[i];
+      s.homed = st["toolhead"]["homed_axes"].as<std::string>();
+      s.state = st["print_stats"]["state"].as<std::string>();
+    } else {
+      std::lock_guard<std::mutex> lock(this->mutex_);
+      s.pos[0] = this->status_.pos[0];  // keep the last position, only flag offline
+      s.pos[1] = this->status_.pos[1];
+      s.pos[2] = this->status_.pos[2];
+    }
+    std::lock_guard<std::mutex> lock(this->mutex_);
+    this->status_ = std::move(s);
+  }
+
+  // POST when body is set, GET otherwise; returns the HTTP status or -1
+  int request(const std::string &path, const std::string *body, std::string *out) {
+    std::string url = this->base_ + path;
+    esp_http_client_config_t cfg{};
+    cfg.url = url.c_str();
+    cfg.timeout_ms = TIMEOUT_MS;
+    cfg.method = body ? HTTP_METHOD_POST : HTTP_METHOD_GET;
+    esp_http_client_handle_t c = esp_http_client_init(&cfg);
+    if (c == nullptr)
+      return -1;
+    int code = -1;
+    int len = body ? body->size() : 0;
+    if (len > 0)
+      esp_http_client_set_header(c, "Content-Type", "application/json");
+    if (esp_http_client_open(c, len) == ESP_OK && (len == 0 || esp_http_client_write(c, body->data(), len) == len)) {
+      esp_http_client_fetch_headers(c);
+      code = esp_http_client_get_status_code(c);
+      char buf[256];
+      int n;
+      while (out != nullptr && (n = esp_http_client_read(c, buf, sizeof(buf))) > 0)
+        out->append(buf, n);
+    }
+    esp_http_client_cleanup(c);
+    return code;
+  }
+
+  std::string base_;
+  std::mutex mutex_;
+  std::deque<std::pair<std::string, std::string>> queue_;
+  Status status_;
+};
+
+inline Client client;
+
+}  // namespace moonraker