feat(mining): auto-balance driver, per-pool algo, live miner version

- app: periodic weighted-random auto-balance of the pool while pool-mining
  (~30-min cadence; restarts the miner only when the pick actually changes),
  plus snapshot + refresh accessors for the UI.
- app_network: resolve the xmrig algo per pool at start (pool.dragonx.cc =
  rx/dragonx, pool.dragonx.is = rx/hush; custom hosts keep the setting).
- xmrig_manager: schema-aware pool-side hashrate readout (fixes a silent 0 for
  Miningcore pools); expose the running miner's version from its HTTP API and a
  cached `xmrig --version` detection so the UI can show it before mining.
- wallet_state: carry the running miner's version.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app.cpp

@@ -22,6 +22,7 @@
 #include "daemon/embedded_daemon.h"
 #include "daemon/lifecycle_adapters.h"
 #include "daemon/xmrig_manager.h"
+#include "util/pool_registry.h"
 #include "ui/windows/main_window.h"
 #include "ui/windows/balance_tab.h"
 #include "ui/windows/send_tab.h"
@@ -109,9 +110,101 @@ namespace dragonx {
 
 using json = nlohmann::json;
 
-App::App() = default;
+App::App()
+{
+    // Seed the auto-balance RNG once per run so weighted-random pool selection isn't
+    // deterministic across launches.
+    balance_rng_.seed(std::random_device{}());
+}
 App::~App() = default;
 
+namespace {
+// How often auto-balance re-evaluates the pool while active. Long, because switching
+// restarts the miner (drops in-flight shares + reconnect); the incumbent stickiness
+// in chooseWeightedPool makes actual switches rarer still.
+constexpr long long kRebalanceIntervalMs = 30LL * 60LL * 1000LL;  // 30 minutes
+
+long long steadyNowMs()
+{
+    using namespace std::chrono;
+    return duration_cast<milliseconds>(steady_clock::now().time_since_epoch()).count();
+}
+} // namespace
+
+void App::updatePoolAutoBalance()
+{
+    if (!settings_) return;
+    if (!supportsPoolMining()) return;  // pool mining is full-node only
+    if (settings_->getPoolSelectMode() != config::Settings::PoolSelectMode::AutoBalance) return;
+    if (!settings_->getPoolMode()) return;  // only while POOL mode is selected
+
+    const long long now = steadyNowMs();
+    const bool intervalDue = (last_balance_eval_ms_ == 0) ||
+                             (now - last_balance_eval_ms_ >= kRebalanceIntervalMs);
+
+    // Kick a background refresh when requested or due (never while one is in flight).
+    if ((balance_refresh_pending_ || intervalDue) && !pool_stats_service_.busy()) {
+        balance_refresh_pending_ = false;
+        last_balance_eval_ms_ = now;
+        balance_snapshot_seen_ = false;
+        pool_stats_service_.refresh(util::knownPools());
+        return;  // results land on a later frame
+    }
+
+    // Apply the freshly-completed snapshot exactly once.
+    if (!pool_stats_service_.busy()) {
+        const auto snap = pool_stats_service_.snapshot();
+        if (snap.ready && !balance_snapshot_seen_) {
+            balance_snapshot_seen_ = true;
+            applyPoolAutoBalance(snap);
+        }
+    }
+}
+
+void App::applyPoolAutoBalance(const util::PoolStatsService::Snapshot& snap)
+{
+    const auto& pools = util::knownPools();
+
+    std::vector<util::PoolHashrate> samples;
+    samples.reserve(pools.size());
+    for (const auto& kp : pools) {
+        const auto it = snap.byId.find(kp.id);
+        samples.push_back(it != snap.byId.end()
+                              ? it->second
+                              : util::PoolHashrate{kp.id, 0.0, false});
+    }
+
+    const util::KnownPool* current = util::findKnownPoolByUrl(settings_->getPoolUrl());
+    const std::string currentId = current ? current->id : std::string{};
+
+    const std::string chosenId = util::chooseWeightedPool(samples, currentId, balance_rng_);
+    if (chosenId.empty() || chosenId == currentId) return;  // keep the current pool
+
+    const util::KnownPool* chosen = nullptr;
+    for (const auto& kp : pools)
+        if (kp.id == chosenId) { chosen = &kp; break; }
+    if (!chosen) return;
+
+    settings_->setPoolUrl(chosen->stratum);
+    settings_->save();
+
+    ui::Notifications::instance().info(
+        std::string(TR("mining_auto_balanced_to")) + " " + chosen->label);
+
+    // Restart so the new pool (and its per-pool algo) takes effect immediately.
+    if (xmrig_manager_ && xmrig_manager_->isRunning()) {
+        const int threads = xmrig_manager_->getRequestedThreads();
+        stopPoolMining();
+        startPoolMining(threads);
+    }
+}
+
+std::string App::poolMiningInstalledVersion()
+{
+    daemon::XmrigManager::startVersionDetection();  // idempotent one-shot
+    return daemon::XmrigManager::installedVersion();
+}
+
 bool App::sendStopCommandSafely(rpc::RPCClient& client, const char* context)
 {
     const char* label = context ? context : "App";
@@ -706,6 +799,7 @@ void App::update()
             ps.pool_diff     = xs.pool_diff;
             ps.pool_url      = xs.pool_url;
             ps.algo          = xs.algo;
+            ps.version       = xs.version;
             ps.connected     = xs.connected;
             // Get memory directly from OS (more reliable than API)
             double memMB = xmrig_manager_->getMemoryUsageMB();
@@ -723,6 +817,9 @@ void App::update()
             state_.pool_mining.xmrig_running = false;
         }
 
+        // Auto-balance: periodically re-pick the pool by hashrate (self-throttled).
+        updatePoolAutoBalance();
+
         // Populate solo mining log lines from daemon output
         if (daemon_controller_ && daemon_controller_->isRunning()) {
             state_.mining.log_lines = daemon_controller_->recentLines(50);

src/app.h

@@ -19,6 +19,7 @@
 #include "services/wallet_security_controller.h"
 #include "services/wallet_security_workflow.h"
 #include "util/async_task_manager.h"
+#include "util/pool_stats_service.h"
 #include "wallet/wallet_capabilities.h"
 #include "ui/sidebar.h"
 #include "ui/windows/console_tab.h"
@@ -204,6 +205,17 @@ public:
         return xmrig_manager_ && xmrig_manager_->isRunning();
     }
 
+    // Auto-balance: latest per-pool hashrate snapshot (for the mining tab pool list),
+    // and a request to refresh it now (Refresh button / switching into Auto mode).
+    util::PoolStatsService::Snapshot poolStatsSnapshot() const {
+        return pool_stats_service_.snapshot();
+    }
+    void requestPoolBalanceRefresh() { balance_refresh_pending_ = true; }
+
+    // Installed miner version (detected from `xmrig --version`, cached; kicks the one-shot
+    // detection on first call) so the mining tab can show it before mining starts.
+    std::string poolMiningInstalledVersion();
+
     // Mine-when-idle state query
     bool isIdleMiningActive() const { return idle_mining_active_; }
 
@@ -455,6 +467,11 @@ private:
     void pruneShieldedHistoryScanProgress();
     void invalidateShieldedHistoryScanProgress(bool persistCache);
 
+    // Auto-balance pool selection: drive the periodic hashrate refresh and apply a
+    // freshly-completed snapshot (weighted-random pick + optional miner restart).
+    void updatePoolAutoBalance();
+    void applyPoolAutoBalance(const util::PoolStatsService::Snapshot& snap);
+
     // Subsystems
     std::unique_ptr<rpc::RPCClient> rpc_;
     std::unique_ptr<rpc::RPCWorker> worker_;
@@ -488,6 +505,13 @@ private:
     bool lite_startup_lock_checked_ = false;
     std::unique_ptr<daemon::DaemonController> daemon_controller_;
     std::unique_ptr<daemon::XmrigManager> xmrig_manager_;
+    // Auto-balance runtime state (pool mining, full-node only). The service fetches
+    // pool hashrates off-thread; the RNG drives the weighted-random pick.
+    util::PoolStatsService pool_stats_service_;
+    std::mt19937 balance_rng_;
+    long long last_balance_eval_ms_ = 0;      // steady-clock ms of the last refresh kick
+    bool balance_refresh_pending_ = false;    // UI asked for an immediate refresh
+    bool balance_snapshot_seen_ = false;      // the current in-flight snapshot was applied
     util::AsyncTaskManager async_tasks_;
     bool pending_antivirus_dialog_ = false;  // Show Windows Defender help dialog
 

src/app_network.cpp

@@ -38,6 +38,7 @@
 #include "daemon/daemon_controller.h"
 #include "daemon/embedded_daemon.h"
 #include "daemon/xmrig_manager.h"
+#include "util/pool_registry.h"
 #include "ui/notifications.h"
 #include "default_banlist_embedded.h"
 #include "util/amount_format.h"
@@ -1718,7 +1719,9 @@ void App::startPoolMining(int threads)
     daemon::XmrigManager::Config cfg;
     cfg.pool_url       = settings_->getPoolUrl();
     cfg.worker_name    = settings_->getPoolWorker();
-    cfg.algo           = settings_->getPoolAlgo();
+    // The algo follows the pool: official pools use their own algo (pool.dragonx.cc
+    // needs rx/dragonx, pool.dragonx.is rx/hush); custom hosts keep the setting.
+    cfg.algo           = util::resolvePoolAlgo(cfg.pool_url, settings_->getPoolAlgo());
     cfg.threads        = threads;  // Use the same thread selection as solo mining
     cfg.tls            = settings_->getPoolTls();
     cfg.hugepages      = settings_->getPoolHugepages();

src/daemon/xmrig_manager.cpp

@@ -8,6 +8,7 @@
 #include "xmrig_manager.h"
 #include "../resources/embedded_resources.h"
 
+#include <cctype>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
@@ -22,6 +23,7 @@
 #include <curl/curl.h>
 
 #include "../util/logger.h"
+#include "../util/pool_registry.h"
 
 #ifdef _WIN32
 #include <winsock2.h>
@@ -718,6 +720,11 @@ void XmrigManager::fetchStatsHttp() {
 
         std::lock_guard<std::mutex> lk(stats_mutex_);
 
+        // Miner version (top-level in /2/summary) — lets the UI show the actually
+        // running miner's version even when no release tag was persisted (bundled miner).
+        if (resp.contains("version") && resp["version"].is_string())
+            stats_.version = resp["version"].get<std::string>();
+
         if (resp.contains("hashrate") && resp["hashrate"].contains("total")) {
             auto& total = resp["hashrate"]["total"];
             if (total.is_array() && total.size() >= 3) {
@@ -768,10 +775,14 @@ void XmrigManager::fetchStatsHttp() {
 void XmrigManager::fetchPoolApiStats() {
     if (state_ != State::Running || pool_host_.empty()) return;
 
-    // Query the pool's public stats API
-    std::string url = "https://" + pool_host_ + "/api/stats";
-    std::string responseData;
+    // Resolve the stats endpoint + JSON schema for this pool. Known pools carry their
+    // own API shape (pool.dragonx.is = custom /api/stats; pool.dragonx.cc = Miningcore
+    // /api/pools); unknown/custom hosts fall back to the .is convention.
+    const util::KnownPool* known = util::findKnownPoolByUrl(pool_host_);
+    const std::string url = known ? known->statsUrl
+                                  : ("https://" + pool_host_ + "/api/stats");
 
+    std::string responseData;
     CURL* curl = curl_easy_init();
     if (!curl) return;
 
@@ -782,31 +793,99 @@ void XmrigManager::fetchPoolApiStats() {
     curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, 3000L);
     curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+    // pool.dragonx.cc sits behind Cloudflare and 403s odd User-Agents.
+    curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/5.0 (compatible; ObsidianDragon)");
+    curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, "");
 
     CURLcode res = curl_easy_perform(curl);
     curl_easy_cleanup(curl);
-
     if (res != CURLE_OK) return;
 
-    try {
-        json resp = json::parse(responseData);
+    bool ok = false;
+    const double poolHR = util::parsePoolHashrate(
+        known ? known->schema : util::PoolStatsSchema::DragonXIs,
+        responseData, known ? known->miningcorePoolId : std::string{}, ok);
+    if (!ok) return;
 
-        // Pool stats API format: { "pools": { "<name>": { "hashrate": ... } } }
-        double poolHR = 0;
-        if (resp.contains("pools") && resp["pools"].is_object()) {
-            for (auto& [key, pool] : resp["pools"].items()) {
-                if (pool.contains("hashrate") && pool["hashrate"].is_number()) {
-                    poolHR = pool["hashrate"].get<double>();
-                    break;  // Use the first pool entry
+    std::lock_guard<std::mutex> lk(stats_mutex_);
+    stats_.pool_hashrate = poolHR;
+}
+
+// ============================================================================
+// Installed-miner version detection (`<binary> --version`, cached)
+// ============================================================================
+
+namespace {
+std::mutex        g_installed_ver_mutex;
+std::string       g_installed_ver;
+std::atomic<bool> g_ver_detect_started{false};
+
+// Extract the first "D.D[.D...]" version token from `--version` output (skips the
+// build date, which uses '-' separators). Returns e.g. "6.21.0", or "" if none.
+std::string parseMinerVersion(const std::string& out)
+{
+    for (size_t i = 0; i < out.size(); ++i) {
+        if (std::isdigit(static_cast<unsigned char>(out[i]))) {
+            size_t j = i;
+            int dots = 0;
+            while (j < out.size() &&
+                   (std::isdigit(static_cast<unsigned char>(out[j])) || out[j] == '.')) {
+                if (out[j] == '.') ++dots;
+                ++j;
+            }
+            if (dots >= 1 && (j - i) >= 3) {
+                // Include a trailing build suffix like "-hac" / "-drg1" (e.g. "6.25.1-hac"),
+                // matching what the running miner's API reports.
+                size_t end = j;
+                if (end < out.size() && out[end] == '-') {
+                    size_t k = end + 1;
+                    while (k < out.size() && std::isalnum(static_cast<unsigned char>(out[k]))) ++k;
+                    if (k > end + 1) end = k;
                 }
+                return out.substr(i, end - i);
+            }
+            i = j;
+        }
+    }
+    return {};
+}
+} // namespace
+
+void XmrigManager::startVersionDetection()
+{
+    if (g_ver_detect_started.exchange(true)) return;  // one-shot
+    std::thread([]() {
+        const std::string bin = findXmrigBinary();
+        std::string ver;
+        if (!bin.empty()) {
+            const std::string cmd = "\"" + bin + "\" --version 2>&1";
+#ifdef _WIN32
+            FILE* fp = _popen(cmd.c_str(), "r");
+#else
+            FILE* fp = popen(cmd.c_str(), "r");
+#endif
+            if (fp) {
+                std::string out;
+                char buf[256];
+                size_t n;
+                while ((n = fread(buf, 1, sizeof(buf), fp)) > 0) out.append(buf, n);
+#ifdef _WIN32
+                _pclose(fp);
+#else
+                pclose(fp);
+#endif
+                ver = parseMinerVersion(out);
             }
         }
+        std::lock_guard<std::mutex> lk(g_installed_ver_mutex);
+        g_installed_ver = ver;
+    }).detach();
+}
 
-        std::lock_guard<std::mutex> lk(stats_mutex_);
-        stats_.pool_hashrate = poolHR;
-    } catch (...) {
-        // Malformed response — ignore
-    }
+std::string XmrigManager::installedVersion()
+{
+    std::lock_guard<std::mutex> lk(g_installed_ver_mutex);
+    return g_installed_ver;
 }
 
 } // namespace daemon

src/daemon/xmrig_manager.h

@@ -43,6 +43,7 @@ public:
         double  pool_diff    = 0;
         std::string pool_url;
         std::string algo;
+        std::string version;      // miner version reported by the running xmrig API
         bool connected       = false;
         // Memory usage
         int64_t memory_free  = 0;   // bytes
@@ -137,6 +138,18 @@ public:
      */
     static std::string findXmrigBinary();
 
+    /**
+     * @brief Kick a one-shot background `<binary> --version` detection (idempotent).
+     * Lets the UI show the installed miner's version before mining is ever started.
+     */
+    static void startVersionDetection();
+
+    /**
+     * @brief Cached installed-miner version parsed by startVersionDetection().
+     * Empty until detection completes (or if no binary/parse failed). Thread-safe.
+     */
+    static std::string installedVersion();
+
 private:
     bool generateConfig(const Config& cfg, const std::string& outPath);
     bool startProcess(const std::string& xmrigPath, const std::string& cfgPath, int threads);

src/data/wallet_state.h

@@ -170,6 +170,7 @@ struct PoolMiningState {
     bool   xmrig_running = false;
     std::string pool_url;
     std::string algo;
+    std::string version;            // running miner's version (from its API)
 
     double hashrate_10s  = 0;
     double hashrate_60s  = 0;