Host metrics (#6817)

* Add std::string exec() function to PortduinoGlue for future work

* MVP for HostMetrics module.

* Fix compilation for other targets

* Remove extra debug calls

* Big numbers don't do well as INTs.

* Add HostMetrics to config.yaml

src/modules/Telemetry/HostMetrics.cpp

@@ -0,0 +1,131 @@
+#include "HostMetrics.h"
+#include "../mesh/generated/meshtastic/telemetry.pb.h"
+#include "MeshService.h"
+#if ARCH_PORTDUINO
+#include "PortduinoGlue.h"
+#include <filesystem>
+#endif
+
+int32_t HostMetricsModule::runOnce()
+{
+#if ARCH_PORTDUINO
+    if (settingsMap[hostMetrics_interval] == 0) {
+        return disable();
+    } else {
+        sendMetrics();
+        return 60 * 1000 * settingsMap[hostMetrics_interval];
+    }
+#else
+    return disable();
+#endif
+}
+
+bool HostMetricsModule::handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshtastic_Telemetry *t)
+{
+    // Don't worry about storing telemetry in NodeDB if we're a repeater
+    if (config.device.role == meshtastic_Config_DeviceConfig_Role_REPEATER)
+        return false;
+
+    if (t->which_variant == meshtastic_Telemetry_host_metrics_tag) {
+#ifdef DEBUG_PORT
+        const char *sender = getSenderShortName(mp);
+
+        LOG_INFO("(Received Host Metrics from %s): uptime=%u, diskfree=%lu, memory free=%lu, load=%04.2f, %04.2f, %04.2f", sender,
+                 t->variant.host_metrics.uptime_seconds, t->variant.host_metrics.diskfree1_bytes,
+                 t->variant.host_metrics.freemem_bytes, static_cast<float>(t->variant.host_metrics.load1) / 100,
+                 static_cast<float>(t->variant.host_metrics.load5) / 100,
+                 static_cast<float>(t->variant.host_metrics.load15) / 100);
+#endif
+    }
+    return false; // Let others look at this message also if they want
+}
+
+/*
+meshtastic_MeshPacket *HostMetricsModule::allocReply()
+{
+    if (currentRequest) {
+        auto req = *currentRequest;
+        const auto &p = req.decoded;
+        meshtastic_Telemetry scratch;
+        meshtastic_Telemetry *decoded = NULL;
+        memset(&scratch, 0, sizeof(scratch));
+        if (pb_decode_from_bytes(p.payload.bytes, p.payload.size, &meshtastic_HostMetrics_msg, &scratch)) {
+            decoded = &scratch;
+        } else {
+            LOG_ERROR("Error decoding HostMetrics module!");
+            return NULL;
+        }
+        // Check for a request for device metrics
+        if (decoded->which_variant == meshtastic_Telemetry_host_metrics_tag) {
+            LOG_INFO("Device telemetry reply to request");
+            return allocDataProtobuf(getHostMetrics());
+        }
+    }
+    return NULL;
+}
+    */
+
+#if ARCH_PORTDUINO
+meshtastic_Telemetry HostMetricsModule::getHostMetrics()
+{
+    std::string file_line;
+    meshtastic_Telemetry t = meshtastic_HostMetrics_init_zero;
+    t.which_variant = meshtastic_Telemetry_host_metrics_tag;
+
+    if (access("/proc/uptime", R_OK) == 0) {
+        std::ifstream proc_uptime("/proc/uptime");
+        if (proc_uptime.is_open()) {
+            std::getline(proc_uptime, file_line, ' ');
+            proc_uptime.close();
+            t.variant.host_metrics.uptime_seconds = stoul(file_line);
+        }
+    }
+
+    std::filesystem::space_info root = std::filesystem::space("/");
+    t.variant.host_metrics.diskfree1_bytes = root.available;
+
+    if (access("/proc/meminfo", R_OK) == 0) {
+        std::ifstream proc_meminfo("/proc/meminfo");
+        if (proc_meminfo.is_open()) {
+            do {
+                std::getline(proc_meminfo, file_line);
+            } while (file_line.find("MemAvailable") == std::string::npos);
+            proc_meminfo.close();
+            t.variant.host_metrics.freemem_bytes = stoull(file_line.substr(file_line.find_first_of("0123456789"))) * 1024;
+        }
+    }
+    if (access("/proc/loadavg", R_OK) == 0) {
+        std::ifstream proc_loadavg("/proc/loadavg");
+        if (proc_loadavg.is_open()) {
+            std::getline(proc_loadavg, file_line, ' ');
+            t.variant.host_metrics.load1 = stof(file_line) * 100;
+            std::getline(proc_loadavg, file_line, ' ');
+            t.variant.host_metrics.load5 = stof(file_line) * 100;
+            std::getline(proc_loadavg, file_line, ' ');
+            t.variant.host_metrics.load15 = stof(file_line) * 100;
+            proc_loadavg.close();
+        }
+    }
+
+    return t;
+}
+
+bool HostMetricsModule::sendMetrics()
+{
+    meshtastic_Telemetry telemetry = getHostMetrics();
+    LOG_INFO("Send: uptime=%u, diskfree=%lu, memory free=%lu, load=%04.2f, %04.2f, %04.2f",
+             telemetry.variant.host_metrics.uptime_seconds, telemetry.variant.host_metrics.diskfree1_bytes,
+             telemetry.variant.host_metrics.freemem_bytes, static_cast<float>(telemetry.variant.host_metrics.load1) / 100,
+             static_cast<float>(telemetry.variant.host_metrics.load5) / 100,
+             static_cast<float>(telemetry.variant.host_metrics.load15) / 100);
+
+    meshtastic_MeshPacket *p = allocDataProtobuf(telemetry);
+    p->to = NODENUM_BROADCAST;
+    p->decoded.want_response = false;
+    p->priority = meshtastic_MeshPacket_Priority_BACKGROUND;
+    p->channel = settingsMap[hostMetrics_channel];
+    LOG_INFO("Send packet to mesh");
+    service->sendToMesh(p, RX_SRC_LOCAL, true);
+    return true;
+}
+#endif

src/modules/Telemetry/HostMetrics.h

@@ -0,0 +1,40 @@
+#pragma once
+#include "../mesh/generated/meshtastic/telemetry.pb.h"
+#include "ProtobufModule.h"
+
+class HostMetricsModule : private concurrency::OSThread, public ProtobufModule<meshtastic_Telemetry>
+{
+    CallbackObserver<HostMetricsModule, const meshtastic::Status *> nodeStatusObserver =
+        CallbackObserver<HostMetricsModule, const meshtastic::Status *>(this, &HostMetricsModule::handleStatusUpdate);
+
+  public:
+    HostMetricsModule()
+        : concurrency::OSThread("HostMetrics"),
+          ProtobufModule("HostMetrics", meshtastic_PortNum_TELEMETRY_APP, &meshtastic_Telemetry_msg)
+    {
+        uptimeWrapCount = 0;
+        uptimeLastMs = millis();
+        nodeStatusObserver.observe(&nodeStatus->onNewStatus);
+        setIntervalFromNow(setStartDelay()); // Wait until NodeInfo is sent
+    }
+    virtual bool wantUIFrame() { return false; }
+
+  protected:
+    /** Called to handle a particular incoming message
+    @return true if you've guaranteed you've handled this message and no other handlers should be considered for it
+    */
+    virtual bool handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshtastic_Telemetry *p) override;
+    // virtual meshtastic_MeshPacket *allocReply() override;
+    virtual int32_t runOnce() override;
+    /**
+     * Send our Telemetry into the mesh
+     */
+    bool sendMetrics();
+
+  private:
+    meshtastic_Telemetry getHostMetrics();
+
+    uint32_t lastSentToMesh = 0;
+    uint32_t uptimeWrapCount;
+    uint32_t uptimeLastMs;
+};