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KingKDot
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/*
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* Sample C++ Plugin — fully unloadable, no runtime baggage.
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*
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* Exports the standard Overlord plugin ABI:
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* PluginOnLoad, PluginOnEvent, PluginOnUnload, PluginSetCallback,
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* PluginGetRuntime (returns "cpp" — tells the host this DLL can be freed)
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*
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* Build (Windows / MSVC):
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* cl /LD /EHsc /O2 plugin.cpp /Fe:sample-cpp-windows-amd64.dll
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* — or with MinGW —
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* x86_64-w64-mingw32-g++ -shared -O2 -o sample-cpp-windows-amd64.dll plugin.cpp
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*
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* Build (Linux):
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* g++ -shared -fPIC -O2 -o sample-cpp-linux-amd64.so plugin.cpp
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*/
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#include <cstdint>
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#include <cstring>
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#include <cstdio>
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#include <string>
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#include <mutex>
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#include <unordered_map>
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/* ------------------------------------------------------------------ */
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/* Platform helpers */
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/* ------------------------------------------------------------------ */
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#ifdef _WIN32
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# define EXPORT extern "C" __declspec(dllexport)
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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BOOL WINAPI DllMain(HINSTANCE hDll, DWORD reason, LPVOID reserved) {
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(void)hDll; (void)reserved;
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return TRUE;
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}
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#else
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# define EXPORT extern "C" __attribute__((visibility("default")))
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#endif
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/* ------------------------------------------------------------------ */
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/* Host callback */
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/* ------------------------------------------------------------------ */
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#ifdef _WIN32
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typedef void (__stdcall *host_callback_t)(
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const char *event, uintptr_t eventLen,
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const char *payload, uintptr_t payloadLen);
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#else
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typedef void (*host_callback_t)(
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uintptr_t ctx,
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const char *event, int eventLen,
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const char *payload, int payloadLen);
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#endif
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static host_callback_t g_callback = nullptr;
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#ifndef _WIN32
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static uintptr_t g_callback_ctx = 0;
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#endif
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static void send_event(const char *event, const char *payload) {
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if (!g_callback) return;
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int elen = event ? static_cast<int>(strlen(event)) : 0;
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int plen = payload ? static_cast<int>(strlen(payload)) : 0;
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#ifdef _WIN32
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g_callback(event, static_cast<uintptr_t>(elen),
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payload, static_cast<uintptr_t>(plen));
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#else
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g_callback(g_callback_ctx, event, elen, payload, plen);
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#endif
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}
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/* ------------------------------------------------------------------ */
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/* Plugin state — demonstrates C++ features (std::string, maps, mutex) */
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/* ------------------------------------------------------------------ */
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static std::mutex g_mu;
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static std::string g_client_id;
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static std::unordered_map<std::string, int> g_event_counts;
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/* Extract a JSON string value by key (simple, no full JSON parser) */
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static std::string json_extract(const char *json, int len, const char *key) {
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if (!json || len <= 0) return "";
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std::string haystack(json, static_cast<size_t>(len));
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std::string needle = std::string("\"") + key + "\":\"";
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auto pos = haystack.find(needle);
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if (pos == std::string::npos) {
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needle = std::string("\"") + key + "\": \"";
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pos = haystack.find(needle);
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}
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if (pos == std::string::npos) return "";
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pos += needle.size();
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auto end = haystack.find('"', pos);
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if (end == std::string::npos) return "";
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return haystack.substr(pos, end - pos);
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}
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/* ------------------------------------------------------------------ */
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/* Exported ABI */
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/* ------------------------------------------------------------------ */
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EXPORT const char *PluginGetRuntime() {
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return "cpp";
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}
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#ifdef _WIN32
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EXPORT void PluginSetCallback(uint64_t cb) {
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g_callback = reinterpret_cast<host_callback_t>(static_cast<uintptr_t>(cb));
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}
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EXPORT int PluginOnLoad(const char *hostInfo, int hostInfoLen, uint64_t cb) {
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g_callback = reinterpret_cast<host_callback_t>(static_cast<uintptr_t>(cb));
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#else
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EXPORT int PluginOnLoad(const char *hostInfo, int hostInfoLen,
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uintptr_t cb, uintptr_t ctx) {
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g_callback = reinterpret_cast<host_callback_t>(cb);
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g_callback_ctx = ctx;
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#endif
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{
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std::lock_guard<std::mutex> lk(g_mu);
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g_client_id = json_extract(hostInfo, hostInfoLen, "clientId");
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g_event_counts.clear();
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}
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fprintf(stderr, "[sample-cpp] loaded, clientId=%s\n", g_client_id.c_str());
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send_event("ready", "{\"message\":\"sample-cpp plugin ready\"}");
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return 0;
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}
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EXPORT int PluginOnEvent(const char *event, int eventLen,
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const char *payload, int payloadLen) {
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std::string ev(event, static_cast<size_t>(eventLen));
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{
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std::lock_guard<std::mutex> lk(g_mu);
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g_event_counts[ev]++;
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}
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if (ev == "ping") {
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send_event("pong", nullptr);
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return 0;
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}
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if (ev == "ui_message") {
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std::string pl(payload ? payload : "", payload ? static_cast<size_t>(payloadLen) : 0u);
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fprintf(stderr, "[sample-cpp] got ui_message: %s\n", pl.c_str());
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std::string resp = "{\"message\":\"echo from C++: " + pl + "\"}";
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send_event("echo", resp.c_str());
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return 0;
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}
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if (ev == "stats") {
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std::lock_guard<std::mutex> lk(g_mu);
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std::string json = "{";
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bool first = true;
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for (auto &kv : g_event_counts) {
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if (!first) json += ",";
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json += "\"" + kv.first + "\":" + std::to_string(kv.second);
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first = false;
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}
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json += "}";
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send_event("stats_reply", json.c_str());
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return 0;
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}
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fprintf(stderr, "[sample-cpp] unhandled event: %s\n", ev.c_str());
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return 0;
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}
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EXPORT void PluginOnUnload() {
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fprintf(stderr, "[sample-cpp] unloading\n");
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g_callback = nullptr;
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#ifndef _WIN32
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g_callback_ctx = 0;
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#endif
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std::lock_guard<std::mutex> lk(g_mu);
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g_client_id.clear();
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g_event_counts.clear();
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}
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@@ -0,0 +1,93 @@
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:root {
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color-scheme: dark;
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}
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* {
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box-sizing: border-box;
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}
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body {
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margin: 0;
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font-family: "Segoe UI", system-ui, sans-serif;
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background: #0f1115;
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color: #e8ecf1;
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}
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.container {
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max-width: 820px;
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margin: 40px auto;
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padding: 0 20px;
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}
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.header h1 {
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margin: 0 0 4px 0;
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font-size: 28px;
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}
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.sub {
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margin: 0 0 24px 0;
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color: #9aa4b2;
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}
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.card {
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background: #161a22;
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border: 1px solid #222938;
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border-radius: 12px;
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padding: 18px;
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margin-bottom: 18px;
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box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
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}
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.row {
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display: grid;
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grid-template-columns: 120px 1fr;
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gap: 12px;
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align-items: center;
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margin-bottom: 12px;
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}
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.label {
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color: #9aa4b2;
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font-size: 14px;
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}
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.input {
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padding: 10px 12px;
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border-radius: 8px;
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border: 1px solid #2a3346;
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background: #0f131b;
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color: #e8ecf1;
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}
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.actions {
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display: flex;
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gap: 10px;
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margin-top: 14px;
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}
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.btn {
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padding: 10px 20px;
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border: none;
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border-radius: 8px;
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background: #2563eb;
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color: #fff;
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cursor: pointer;
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font-size: 14px;
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}
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.btn:hover {
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background: #1d4ed8;
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}
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.log {
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background: #0b0e14;
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border: 1px solid #1e2533;
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border-radius: 8px;
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padding: 14px;
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font-size: 13px;
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line-height: 1.6;
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max-height: 300px;
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overflow-y: auto;
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white-space: pre-wrap;
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word-break: break-all;
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}
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@@ -0,0 +1,42 @@
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Sample C++ Plugin</title>
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<link rel="stylesheet" href="/plugins/sample-cpp/assets/sample-cpp.css" />
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</head>
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<body>
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<main class="container">
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<header class="header">
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<h1>Sample C++ Plugin</h1>
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<p class="sub">C++ — fully unloadable, zero runtime leak</p>
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</header>
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<section class="card">
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<div class="row">
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<label class="label">Client ID</label>
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<input id="client-id" class="input" placeholder="clientId" />
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</div>
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<div class="row">
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<label class="label">Message</label>
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<input id="message" class="input" placeholder="hello from UI" />
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</div>
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<div class="actions">
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<button id="send-btn" class="btn">Send event to client</button>
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<button id="ping-btn" class="btn">Ping</button>
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<button id="stats-btn" class="btn">Get Stats</button>
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</div>
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</section>
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<section class="card">
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<h2>Log</h2>
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<pre id="log" class="log"></pre>
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</section>
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</main>
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<script src="/plugins/sample-cpp/assets/sample-cpp.js"></script>
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</body>
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</html>
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@@ -0,0 +1,47 @@
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const params = new URLSearchParams(window.location.search);
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const clientIdInput = document.getElementById("client-id");
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const messageInput = document.getElementById("message");
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const logEl = document.getElementById("log");
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const sendBtn = document.getElementById("send-btn");
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const pingBtn = document.getElementById("ping-btn");
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const statsBtn = document.getElementById("stats-btn");
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const pluginId = "sample-cpp";
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clientIdInput.value = params.get("clientId") || "";
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messageInput.value = "hello from sample-cpp UI";
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function log(line) {
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const ts = new Date().toISOString();
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logEl.textContent = `${ts} ${line}\n` + logEl.textContent;
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}
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async function sendEvent(event, payload) {
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const clientId = clientIdInput.value.trim();
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if (!clientId) { log("Missing clientId"); return; }
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const res = await fetch(`/api/clients/${encodeURIComponent(clientId)}/plugins/${pluginId}/event`, {
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method: "POST",
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headers: { "Content-Type": "application/json" },
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body: JSON.stringify({ event, payload }),
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});
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if (!res.ok) { log(`Send failed: ${res.status} ${await res.text()}`); return; }
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log(`Sent event: ${event}`);
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}
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sendBtn.addEventListener("click", () => {
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sendEvent("ui_message", { message: messageInput.value.trim() });
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});
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pingBtn.addEventListener("click", () => {
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sendEvent("ping", {});
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});
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statsBtn.addEventListener("click", () => {
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sendEvent("stats", {});
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});
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if (typeof EventSource !== "undefined") {
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const clientId = params.get("clientId");
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if (clientId) {
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log("Ready — C++ plugin (fully unloadable)");
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}
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}
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