Johanness
5b5ffa1308
- CMake build system with vcpkg dependency management - libdmf-node: Node interface, port definitions, WebSocket control server, node runner with MXL lifecycle management - libdmf-engine: Graph model (nodes/edges CRUD, serialization), FlowManager (UUID + V210 NMOS flow definitions), ProcessManager (fork/exec node processes), ApiServer (REST API for graph control) - Passthrough node: reads V210 grains from MXL, copies, writes to MXL - Unit tests for Graph and FlowManager (6 cases, 21 assertions) - MXL SDK as git submodule (symlinked from extern/mxl)
224 lines
8.1 KiB
C++
224 lines
8.1 KiB
C++
#include <dmf-engine/api_server.hpp>
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#include <dmf-engine/graph.hpp>
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#include <dmf-engine/flow_manager.hpp>
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#include <dmf-engine/process_manager.hpp>
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#include <libwebsockets.h>
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#include <nlohmann/json.hpp>
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#include <spdlog/spdlog.h>
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#include <cstring>
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#include <string>
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namespace dmf_engine {
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struct ApiServerImpl {
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uint16_t port = 0;
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Graph* graph = nullptr;
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FlowManager* flow_manager = nullptr;
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ProcessManager* process_manager = nullptr;
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struct lws_context* context = nullptr;
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};
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struct ApiServer::Impl {
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std::unique_ptr<ApiServerImpl> data;
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};
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struct HttpRequest {
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std::string method;
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std::string path;
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std::string body;
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bool body_done = false;
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};
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static ApiServerImpl* g_impl = nullptr;
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static int callback_http(struct lws* wsi, enum lws_callback_reasons reason,
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void* user, void* in, size_t len) {
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auto* req = static_cast<HttpRequest*>(user);
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switch (reason) {
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case LWS_CALLBACK_HTTP: {
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new (req) HttpRequest();
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if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) > 0) {
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req->method = "POST";
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char buf[256] = {};
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lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_POST_URI);
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req->path = buf;
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} else {
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req->method = "GET";
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char buf[256] = {};
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lws_hdr_copy(wsi, buf, sizeof(buf), WSI_TOKEN_GET_URI);
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req->path = buf;
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}
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break;
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}
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case LWS_CALLBACK_HTTP_BODY: {
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req->body.append(static_cast<char*>(in), len);
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break;
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}
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case LWS_CALLBACK_HTTP_BODY_COMPLETION: {
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if (!g_impl || !g_impl->graph) {
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lws_return_http_status(wsi, HTTP_STATUS_INTERNAL_SERVER_ERROR, "Server error");
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return -1;
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}
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std::string status_str, content_type, response_body;
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auto ok = [&](const nlohmann::json& j) {
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status_str = "200 OK";
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response_body = j.dump();
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};
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auto created = [&](const nlohmann::json& j) {
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status_str = "201 Created";
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response_body = j.dump();
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};
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auto error_resp = [&](int code, const std::string& msg) {
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status_str = std::to_string(code) + " Error";
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response_body = nlohmann::json({{"error", msg}}).dump();
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};
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content_type = "application/json";
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try {
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nlohmann::json req_body = req->body.empty() ? nlohmann::json::object() : nlohmann::json::parse(req->body);
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auto& graph = *g_impl->graph;
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auto& fm = *g_impl->flow_manager;
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auto& pm = *g_impl->process_manager;
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if (req->path == "/api/graph" && req->method == "GET") {
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ok(graph.serialize());
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} else if (req->path == "/api/graph/nodes" && req->method == "POST") {
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if (!req_body.contains("type")) {
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error_resp(400, "Missing 'type' field");
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} else {
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auto type = req_body["type"].get<std::string>();
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auto config = req_body.value("config", nlohmann::json::object());
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auto id = graph.add_node(type, config);
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created({{"id", id}});
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}
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} else if (req->path.find("/api/graph/nodes/") == 0 && req->method == "DELETE") {
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auto node_id = req->path.substr(std::string("/api/graph/nodes/").length());
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if (graph.remove_node(node_id)) {
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ok({{"deleted", node_id}});
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} else {
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error_resp(404, "Node not found: " + node_id);
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}
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} else if (req->path == "/api/graph/edges" && req->method == "POST") {
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if (!req_body.contains("from_node") || !req_body.contains("to_node")) {
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error_resp(400, "Missing from_node/to_node");
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} else {
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auto from_node = req_body["from_node"].get<std::string>();
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auto from_port = req_body.value("from_port", "video_out");
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auto to_node = req_body["to_node"].get<std::string>();
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auto to_port = req_body.value("to_port", "video_in");
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auto flow_id = fm.create_flow_id();
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auto flow_def = fm.create_v210_flow_def(flow_id, 1920, 1080, 50, 1);
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auto edge_id = graph.add_edge(from_node, from_port, to_node, to_port, flow_id, flow_def);
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created({{"id", edge_id}, {"flow_id", flow_id}});
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}
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} else if (req->path.find("/api/graph/edges/") == 0 && req->method == "DELETE") {
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auto edge_id = req->path.substr(std::string("/api/graph/edges/").length());
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if (graph.remove_edge(edge_id)) {
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ok({{"deleted", edge_id}});
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} else {
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error_resp(404, "Edge not found: " + edge_id);
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}
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} else if (req->path == "/api/graph/start" && req->method == "POST") {
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auto nodes = graph.get_nodes();
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uint16_t port = 9100;
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for (auto& node : nodes) {
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pm.start_node(const_cast<GraphNode&>(node), "/dev/shm/mxl", port++);
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}
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ok({{"status", "started"}});
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} else if (req->path == "/api/graph/stop" && req->method == "POST") {
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auto nodes = graph.get_nodes();
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for (auto& node : nodes) {
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pm.stop_node(const_cast<GraphNode&>(node));
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}
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ok({{"status", "stopped"}});
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} else {
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error_resp(404, "Not found: " + req->method + " " + req->path);
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}
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} catch (const nlohmann::json::exception& e) {
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error_resp(400, std::string("JSON error: ") + e.what());
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} catch (const std::exception& e) {
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error_resp(500, e.what());
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}
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auto headers = "HTTP/1.1 " + status_str + "\r\n"
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"Content-Type: " + content_type + "\r\n"
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"Access-Control-Allow-Origin: *\r\n"
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"Access-Control-Allow-Methods: GET, POST, DELETE, PUT, OPTIONS\r\n"
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"Access-Control-Allow-Headers: Content-Type\r\n"
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"Content-Length: " + std::to_string(response_body.size()) + "\r\n"
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"\r\n";
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std::vector<uint8_t> buf(LWS_PRE + headers.size() + response_body.size());
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std::memcpy(buf.data() + LWS_PRE, headers.data(), headers.size());
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std::memcpy(buf.data() + LWS_PRE + headers.size(), response_body.data(), response_body.size());
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lws_write(wsi, buf.data() + LWS_PRE, headers.size() + response_body.size(), LWS_WRITE_HTTP);
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if (lws_http_transaction_completed(wsi)) {
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return -1;
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}
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return 0;
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}
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default:
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break;
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}
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return 0;
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}
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static const struct lws_protocols protocols[] = {
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{"http-api", callback_http, sizeof(HttpRequest), 0},
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{nullptr, nullptr, 0, 0},
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};
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ApiServer::ApiServer(uint16_t port, Graph& graph, FlowManager& flow_manager, ProcessManager& process_manager)
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: impl_(std::make_unique<Impl>()) {
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impl_->data = std::make_unique<ApiServerImpl>();
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impl_->data->port = port;
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impl_->data->graph = &graph;
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impl_->data->flow_manager = &flow_manager;
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impl_->data->process_manager = &process_manager;
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g_impl = impl_->data.get();
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struct lws_context_creation_info info;
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std::memset(&info, 0, sizeof(info));
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info.port = port;
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info.protocols = protocols;
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info.gid = -1;
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info.uid = -1;
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impl_->data->context = lws_create_context(&info);
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if (!impl_->data->context) {
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spdlog::error("Failed to create HTTP context on port {}", port);
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throw std::runtime_error("Failed to create HTTP context");
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}
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spdlog::info("API server: listening on port {}", port);
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}
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ApiServer::~ApiServer() {
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if (impl_->data && impl_->data->context) {
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lws_context_destroy(impl_->data->context);
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}
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if (g_impl == impl_->data.get()) {
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g_impl = nullptr;
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}
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}
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void ApiServer::poll(int timeout_ms) {
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lws_service(impl_->data->context, timeout_ms);
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}
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} // namespace dmf_engine
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