c@5: 
c@5: #include "VampJson.h"
c@5: 
c@5: #include <iostream>
c@5: #include <sstream>
c@5: #include <stdexcept>
c@5: 
c@5: #include <map>
c@5: #include <set>
c@5: 
c@5: using namespace std;
c@5: using namespace Vamp;
c@5: using namespace Vamp::HostExt;
c@5: using namespace json11;
c@5: 
c@5: static map<uint32_t, Plugin *> loadedPlugins;
c@5: static set<uint32_t> initialisedPlugins;
c@5: 
c@5: static uint32_t nextHandle = 1; // plugin handle type must fit in JSON number
c@5: 
c@5: Vamp::HostExt::LoadResponse
c@5: loadPlugin(json11::Json j) {
c@5: 
c@5:     auto req = VampJson::toLoadRequest(j);
c@5:     auto loader = Vamp::HostExt::PluginLoader::getInstance();
c@5:     auto response = loader->loadPlugin(req);
c@5:     
c@5:     if (!response.plugin) {
c@5: 	throw VampJson::Failure("plugin load failed");
c@5:     }
c@5:     
c@5:     return response;
c@5: }
c@5:     
c@5: Vamp::Plugin::OutputList
c@5: configurePlugin(Vamp::Plugin *plugin, json11::Json j) {
c@5:     
c@5:     auto config = VampJson::toPluginConfiguration(j);
c@5:     auto loader = Vamp::HostExt::PluginLoader::getInstance();
c@5:     auto outputs = loader->configurePlugin(plugin, config);
c@5: 
c@5:     if (outputs.empty()) {
c@5: 	throw VampJson::Failure("plugin initialisation failed (invalid channelCount, stepSize, blockSize?)");
c@5:     }
c@5:     
c@5:     return outputs;
c@5: }
c@5: 
c@5: Json
c@5: handle_list(Json content)
c@5: {
c@5:     if (content != Json()) {
c@5: 	throw VampJson::Failure("no content expected for list request");
c@5:     }
c@5:     
c@5:     auto loader = PluginLoader::getInstance();
c@5:     auto pluginData = loader->listPluginData();
c@5: 
c@5:     Json::array j;
c@5:     for (const auto &pd: pluginData) {
c@5: 	j.push_back(VampJson::fromPluginStaticData(pd));
c@5:     }
c@5:     return Json(j);
c@5: }
c@5: 
c@5: Json
c@5: handle_load(Json j)
c@5: {
c@5:     auto loadResponse = loadPlugin(j);
c@5: 
c@5:     if (!loadResponse.plugin) {
c@5: 	throw VampJson::Failure("plugin load failed");
c@5:     }
c@5:     
c@5:     uint32_t h = nextHandle++;
c@5:     loadedPlugins[h] = loadResponse.plugin;
c@5: 
c@5:     Json::object response;
c@5:     response["pluginHandle"] = double(h);
c@5:     response["staticData"] =
c@5: 	VampJson::fromPluginStaticData(loadResponse.staticData);
c@5:     response["defaultConfiguration"] =
c@5: 	VampJson::fromPluginConfiguration(loadResponse.defaultConfiguration);
c@5: 
c@5:     cerr << "Loaded plugin: handle is " << h << endl;
c@5:     
c@5:     return Json(response);
c@5: }
c@5: 
c@5: Json
c@5: handle_configure(Json j)
c@5: {
c@5:     string err;
c@5: 
c@5:     if (!j.has_shape({
c@5: 		{ "pluginHandle", Json::NUMBER },
c@5: 		{ "configuration", Json::OBJECT }}, err)) {
c@5: 	throw VampJson::Failure("malformed configuration request: " + err);
c@5:     }
c@5: 
c@5:     uint32_t handle = j["pluginHandle"].int_value();
c@5: 
c@5:     if (loadedPlugins.find(handle) == loadedPlugins.end()) {
c@5: 	throw VampJson::Failure("unknown plugin handle");
c@5:     }
c@5: 
c@5:     if (initialisedPlugins.find(handle) != initialisedPlugins.end()) {
c@5: 	throw VampJson::Failure("plugin has already been initialised");
c@5:     }
c@5: 
c@5:     Plugin *plugin = loadedPlugins[handle];
c@5:     
c@5:     Json config = j["configuration"];
c@5: 
c@5:     configurePlugin(plugin, config);
c@5: 
c@5:     initialisedPlugins.insert(handle);
c@5: 
c@5:     cerr << "Configured and initialised plugin " << handle << endl;
c@5: 
c@5:     Json::object jout;
c@5:     Json::array outs;
c@5:     Vamp::Plugin::OutputList vouts = plugin->getOutputDescriptors();
c@5:     for (auto &o: vouts) {
c@5: 	outs.push_back(VampJson::fromOutputDescriptor(o));
c@5:     }
c@5:     jout["outputList"] = outs;
c@5:     return Json(jout);
c@5: }
c@5: 
c@5: Json
c@5: handle(string input)
c@5: {
c@5:     string err;
c@5:     Json j = Json::parse(input, err);
c@5: 
c@5:     if (err != "") {
c@5: 	throw VampJson::Failure("invalid request: " + err);
c@5:     }
c@5: 
c@5:     if (!j["verb"].is_string()) {
c@5: 	throw VampJson::Failure("verb expected in request");
c@5:     }
c@5: 
c@5:     if (!j["content"].is_null() &&
c@5: 	!j["content"].is_object()) {
c@5: 	throw VampJson::Failure("object expected for content");
c@5:     }
c@5: 
c@5:     string verb = j["verb"].string_value();
c@5:     Json content = j["content"];
c@5:     Json result;
c@5: 
c@5:     if (verb == "list") {
c@5: 	result = handle_list(content);
c@5:     } else if (verb == "load") {
c@5: 	result = handle_load(content);
c@5:     } else if (verb == "configure") {
c@5: 	result = handle_configure(content);
c@5:     } else {
c@5: 	throw VampJson::Failure("unknown verb: " + verb +
c@5: 				" (known verbs are: list load configure)");
c@5:     }
c@5: 
c@5:     return result;
c@5: }
c@5: 
c@5: Json
c@5: success_response(Json payload)
c@5: {
c@5:     Json::object obj;
c@5:     obj["success"] = true;
c@5:     obj["response"] = payload;
c@5:     return Json(obj);
c@5: }
c@5: 
c@5: Json
c@5: error_response(string text)
c@5: {
c@5:     Json::object obj;
c@5:     obj["success"] = false;
c@5:     obj["errorText"] = text;
c@5:     return Json(obj);
c@5: }
c@5: 
c@5: template<typename T>
c@5: T &getline(T &in, string prompt, string &out)
c@5: {
c@5:     cerr << prompt;
c@5:     return getline(in, out);
c@5: }
c@5: 
c@5: int main(int, char **)
c@5: {
c@5:     string line;
c@5: 
c@5:     while (getline(cin, "> ", line)) {
c@5: 	try {
c@5: 	    Json result = handle(line);
c@5: 	    cout << success_response(result).dump() << endl;
c@5: 	} catch (const VampJson::Failure &e) {
c@5: 	    cout << error_response(e.what()).dump() << endl;
c@5: 	}
c@5:     }
c@5: 
c@5:     return 0;
c@5: }
c@5: 
c@5: