File size: 8,167 Bytes
90c2369 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 | #include "McpServer.h"
// httplib must be included in exactly ONE .cpp file
#define CPPHTTPLIB_THREAD_POOL_COUNT 2
#include "httplib.h"
#include "json.hpp"
using json = nlohmann::json;
McpServer::McpServer(int port)
: server(std::make_unique<httplib::Server>()), port(port)
{
setupRoutes();
}
McpServer::~McpServer()
{
stop();
}
void McpServer::setupRoutes()
{
// Single MCP endpoint — all JSON-RPC goes through here
server->Post("/mcp", [this](const httplib::Request& req, httplib::Response& res) {
res.set_header("Access-Control-Allow-Origin", "http://localhost");
try {
auto body = json::parse(req.body);
std::string method = body.value("method", "");
std::string responseStr;
if (method == "initialize") {
responseStr = handleInitialize(req.body);
}
else if (method == "notifications/initialized") {
// Notification — no response needed
initialized = true;
res.status = 204;
return;
}
else if (method == "tools/list") {
responseStr = handleToolsList();
}
else if (method == "tools/call") {
responseStr = handleToolsCall(req.body);
}
else {
json errResponse = {
{"jsonrpc", "2.0"},
{"id", body.value("id", json(nullptr))},
{"error", {{"code", -32601}, {"message", "Method not found"}}}
};
responseStr = errResponse.dump();
}
if (!responseStr.empty()) {
res.set_content(responseStr, "application/json");
}
}
catch (const json::exception& e) {
json errResponse = {
{"jsonrpc", "2.0"},
{"id", nullptr},
{"error", {{"code", -32700}, {"message", "Parse error"}}}
};
res.set_content(errResponse.dump(), "application/json");
}
});
// Health check — quick way to verify server is alive
server->Get("/health", [this](const httplib::Request&, httplib::Response& res) {
json health = {{"status", "ok"}, {"port", port}, {"initialized", initialized}};
res.set_content(health.dump(), "application/json");
});
// CORS preflight
server->Options("/mcp", [](const httplib::Request&, httplib::Response& res) {
res.set_header("Access-Control-Allow-Origin", "http://localhost");
res.set_header("Access-Control-Allow-Methods", "POST, OPTIONS");
res.set_header("Access-Control-Allow-Headers", "Content-Type, Mcp-Session-Id");
res.status = 204;
});
}
void McpServer::start()
{
if (running.load()) return;
serverThread = std::thread([this]() {
running.store(true);
server->listen("127.0.0.1", port);
running.store(false);
});
// Wait until server is actually ready
server->wait_until_ready();
}
void McpServer::stop()
{
if (server && server->is_running()) {
server->stop();
}
if (serverThread.joinable()) {
serverThread.join();
}
running.store(false);
}
bool McpServer::isRunning() const
{
return running.load();
}
void McpServer::serverThreadFunc()
{
server->listen("127.0.0.1", port);
}
// --- MCP Protocol Handlers ---
std::string McpServer::handleInitialize(const std::string& requestBody)
{
auto body = json::parse(requestBody);
// Generate session ID
sessionId = "pb-" + std::to_string(std::chrono::steady_clock::now().time_since_epoch().count());
json response = {
{"jsonrpc", "2.0"},
{"id", body.value("id", json(nullptr))},
{"result", {
{"protocolVersion", "2025-06-18"},
{"capabilities", {
{"tools", {{"listChanged", false}}}
}},
{"serverInfo", {
{"name", "PluginBridge"},
{"version", "0.1.0"}
}}
}}
};
return response.dump();
}
std::string McpServer::handleToolsList()
{
json response = {
{"jsonrpc", "2.0"},
{"id", 1},
{"result", {
{"tools", json::array({
{
{"name", "list_plugins"},
{"description", "List all loaded plugin instances"},
{"inputSchema", {{"type", "object"}, {"properties", json::object()}}}
},
{
{"name", "search_param"},
{"description", "Search plugin parameters by keyword"},
{"inputSchema", {
{"type", "object"},
{"properties", {
{"plugin", {{"type", "string"}, {"description", "Plugin name"}}},
{"keyword", {{"type", "string"}, {"description", "Search term"}}}
}},
{"required", json::array({"plugin", "keyword"})}
}}
},
{
{"name", "get_params"},
{"description", "Get current values for parameter IDs"},
{"inputSchema", {
{"type", "object"},
{"properties", {
{"plugin", {{"type", "string"}}},
{"ids", {{"type", "array"}, {"items", {{"type", "integer"}}}}}
}},
{"required", json::array({"plugin", "ids"})}
}}
},
{
{"name", "set_params"},
{"description", "Set parameter values by ID (batch)"},
{"inputSchema", {
{"type", "object"},
{"properties", {
{"plugin", {{"type", "string"}}},
{"values", {{"type", "object"}, {"description", "param_id → value (0.0-1.0)"}}}
}},
{"required", json::array({"plugin", "values"})}
}}
},
{
{"name", "get_analysis"},
{"description", "Get real-time audio analysis (LUFS, bands, stereo)"},
{"inputSchema", {{"type", "object"}, {"properties", json::object()}}}
}
})}
}}
};
return response.dump();
}
std::string McpServer::handleToolsCall(const std::string& requestBody)
{
auto body = json::parse(requestBody);
std::string toolName = body["params"]["name"];
json result;
if (toolName == "list_plugins") {
// Sprint 1: no plugins loaded yet
result = {
{"content", json::array({{{"type", "text"}, {"text", "[]"}}})},
{"isError", false}
};
}
else if (toolName == "search_param") {
result = {
{"content", json::array({{{"type", "text"}, {"text", "no plugin loaded"}}})},
{"isError", true}
};
}
else if (toolName == "get_params") {
result = {
{"content", json::array({{{"type", "text"}, {"text", "no plugin loaded"}}})},
{"isError", true}
};
}
else if (toolName == "set_params") {
result = {
{"content", json::array({{{"type", "text"}, {"text", "no plugin loaded"}}})},
{"isError", true}
};
}
else if (toolName == "get_analysis") {
// Sprint 1: stub response
result = {
{"content", json::array({{{"type", "text"}, {"text", "silent"}}})},
{"isError", false}
};
}
else {
result = {
{"content", json::array({{{"type", "text"}, {"text", "unknown tool: " + toolName}}})},
{"isError", true}
};
}
json response = {
{"jsonrpc", "2.0"},
{"id", body.value("id", json(nullptr))},
{"result", result}
};
return response.dump();
}
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