Change code to use Restbed

2 files changed, 462 insertions, 123 deletions

diff --git a/api/umosapi.cpp b/api/umosapi.cpp
index 83965a3..af58b37 100644
--- a/api/umosapi.cpp
+++ b/api/umosapi.cpp
@@ -17,6 +17,12 @@
 #include "../db/mongo_access.h"
 #include "../db/uobject.h"
 
+#include <regex>
+#include <sstream>
+#include <iomanip>
+#include <fstream>
+#include <streambuf>
+
 mongo_access mongo;
 
 
@@ -30,133 +36,395 @@ using bsoncxx::builder::stream::open_document;
 using json = nlohmann::json;
 
 using namespace std;
-using namespace Pistache;
+using namespace restbed;
 
-namespace Generic {
-    void handleReady(const Rest::Request&, Http::ResponseWriter response) {
-        response.send(Http::Code::Ok, "1");
-    }
-}
+UmosapiService::UmosapiService() {}
 
-UmosapiService::UmosapiService(Address addr)
-    : httpEndpoint(std::make_shared<Http::Endpoint>(addr))
-    , desc("Unity Mongo Save API", "0.1")
-{ }
+void UmosapiService::init() {
 
-void UmosapiService::init(size_t thr = 2) {
     auto uri = mongocxx::uri{config["mongoURI"]};
     mongo.configure(std::move(uri));
-    auto opts = Http::Endpoint::options()
-        .threads(thr);
-    httpEndpoint->init(opts);
-    createDescription();
-}
-
-void UmosapiService::start(std::string swaggerui) {
-    router.initFromDescription(desc);
-
-    Rest::Swagger swagger(desc);
-    swagger
-        .uiPath("/doc")
-        .uiDirectory(swaggerui)
-        .apiPath("/api")
-        .serializer(&Rest::Serializer::rapidJson)
-        .install(router);
-
-    httpEndpoint->setHandler(router.handler());
-    httpEndpoint->serve();
-}
-
-void UmosapiService::createDescription() {
-    desc
-        .info()
-        .license("Apache", "https://neodarz.net");
-
-    auto backendErrorResponse =
-        desc.response(Http::Code::Internal_Server_Error, "Backend is dead, it's the end of the world");
-
-    desc
-        .schemes(Rest::Scheme::Http)
-        .basePath("/v1")
-        .produces(MIME(Application, Json))
-        .consumes(MIME(Application, Json));
-
-    desc
-        .route(desc.get("/ready"))
-        .bind(&Generic::handleReady)
-        .response(Http::Code::Ok, "Api started")
-        .response(backendErrorResponse);
-
-    auto versionPath = desc.path("/v1");
-
-    versionPath
-        .route(desc.get("/:mcollection"))
-        .bind(&UmosapiService::UmosapiService::retrieveAll, this)
-        .produces(MIME(Application, Json))
-        .parameter<Rest::Type::String>("mcollection", "Name of the collection where the uobjects are located")
-        .response(Http::Code::Ok, "List of uobjects")
-        .response(backendErrorResponse);
-
-    versionPath
-        .route(desc.post("/:mcollection"))
-        .bind(&UmosapiService::UmosapiService::addUObject, this)
-        .produces(MIME(Application, Json))
-        .parameter<Rest::Type::String>("mcollection", "Name of the collection where the uobjects are located")
-        .response(Http::Code::Ok, "Uobject created")
-        .response(backendErrorResponse);
-
-    versionPath
-        .route(desc.del("/:mcollection/:oid"))
-        .bind(&UmosapiService::UmosapiService::deleteUObject, this)
-        .produces(MIME(Application, Json))
-        .parameter<Rest::Type::String>("mcollection", "Name of the collection where the uobjects are located")
-        .parameter<Rest::Type::String>("oid", "MongoDB oid of the uobject")
-        .response(Http::Code::Ok, "Uobject deleted")
-        .response(backendErrorResponse);
-
-    versionPath
-        .route(desc.get("/:mcollection/:key/:value"))
-        .bind(&UmosapiService::UmosapiService::searchUObjectByKeyValue, this)
-        .produces(MIME(Application, Json))
-        .parameter<Rest::Type::String>("mcollection", "Name of the collection where the uobjects are located")
-        .parameter<Rest::Type::String>("key", "Key of uobject to search, ex.: kil or total.kill")
-        .parameter<Rest::Type::String>("value", "Value of uobject to search, ex.: 12")
-        .response(Http::Code::Ok, "Uobject found")
-        .response(backendErrorResponse);
-}
-
-void UmosapiService::retrieveAll(const Rest::Request& request, Http::ResponseWriter response) {
-    auto jsonObjects = json_object_new_array();
-    auto json_string = uobject::retrieveAll(request.param(":mcollection").as<string>(), jsonObjects);
-    json_object_put(jsonObjects);
+    createResource();
+    ofstream swagger_json;
+    swagger_json.open(config["swaggerui"] + "/swagger.json");
+    swagger_json << _swagger.dump();
+    swagger_json.close();
+}
 
-    response.send(Http::Code::Ok, json_string, MIME(Application, Json));
+void UmosapiService::start(int port, int thr) {
+    auto settings = make_shared< Settings >();
+    settings->set_port( port );
+    settings->set_worker_limit( thr );
+    settings->set_default_header("Connection", "close");
+    _service.start(settings);
 }
 
-void UmosapiService::addUObject(const Rest::Request& request, Http::ResponseWriter response) {
-    auto jsonObject = json_object_new_object();
+void service_error_handler( const int, const exception& e, const shared_ptr< Session > session )
+{
+    std::string message = "Backend Service is dead: ";
+    message += e.what();
+    if ( session->is_open( ) )
+        session->close( 500, message, { { "Content-Length", ::to_string(message.length()) } } );
+    fprintf( stderr, "ERROR: %s.\n", message.c_str() );
+}
 
-    auto json_string = uobject::add(request.param(":mcollection").as<string>(), jsonObject,  request.body().c_str());
+void resource_error_handler( const int, const exception& e, const shared_ptr< Session > session )
+{
+    std::string message = "Backend Resource is dead: ";
+    message += e.what();
+    if ( session->is_open( ) )
+        session->close( 500, message, { { "Content-Length", ::to_string(message.length()) } } );
+    fprintf( stderr, "ERROR: %s.\n", message.c_str() );
+}
 
-    response.send(Http::Code::Ok, json_string, MIME(Application, Json));
-    json_object_put(jsonObject);
+void faulty_method_handler( const shared_ptr< Session > )
+{
+    throw SERVICE_UNAVAILABLE;
+}
+
+void is_ready(const shared_ptr<Session> session)
+{
+    session->close( OK, "1", { { "Content-Length", "1"}});
+}
+
+/*
+ * Add new route in service
+ * service: the service pointer
+ * route: path of the route
+ * http_word: word http who defin REST request
+ * callback: function to call when the route is requested
+ * error_callback: error to show if everything is broken
+ * tags: array of tags
+ */
+void UmosapiService::desc(std::string route, std::string http_word, const std::function< void ( const std::shared_ptr< Session > ) >& callback, const std::function< void(int, const std::exception&, std::shared_ptr<restbed::Session>) >& error_callback, tag tags[]) {
+    auto resource = make_shared< Resource > ();
+    resource->set_path(route);
+    resource->set_method_handler(http_word, callback);
+    resource->set_error_handler( error_callback );
+
+    _service.publish(resource);
+}
+
+void UmosapiService::description(std::string description) {
+    _swagger["info"]["description"] = description;
+}
+
+void UmosapiService::title(std::string title) {
+    _swagger["info"]["title"] = title;
+}
+
+void UmosapiService::version(std::string version) {
+    _swagger["info"]["version"] = version;
+}
+
+void UmosapiService::basePath(std::string basePath) {
+    _swagger["swagger"] = "2.0";
+    _swagger["basePath"] = basePath;
+}
+
+void UmosapiService::host(std::string host) {
+    _swagger["host"] = host;
+}
+
+void UmosapiService::atag(std::string name, std::string description) {
+    struct tag the_tag;
+    the_tag.name = name;
+    the_tag.description = description;
+
+    _tags.push_back(the_tag);
+    _swagger["tags"].push_back({ {"name",the_tag.name},{"description", the_tag.description} });
+
+}
+
+void UmosapiService::scheme(std::string scheme) {
+    _swagger["schemes"].push_back(scheme);
+}
+
+void UmosapiService::set_path(std::string route) {
+    _resource = make_shared< Resource > ();
+    _resource->set_path(route);
+    std::regex parameter(":.*?}");
+    std::regex base_path("^/v2");
+    auto tmp_route = std::regex_replace (route,parameter,"}");
+    auto final_route = std::regex_replace (tmp_route,base_path,"");
+    _path = Path{final_route};
+    _swagger["paths"][final_route] = {};
+}
+
+void UmosapiService::set_method_handler(std::string http_word, const std::function< void ( const std::shared_ptr< Session > ) >& callback) {
+    _resource->set_method_handler(http_word, callback);
+    std::locale loc;
+    for (auto& c : http_word) {
+        c = tolower(c);
+    }
+    _path.words.push_back(HttpWord{http_word});
+    _swagger["paths"][_path.name][http_word]["description"] = "";
+    _swagger["paths"][_path.name][http_word]["operationId"] = "";
+    _swagger["paths"][_path.name][http_word]["summary"] = "";
+}
+
+void UmosapiService::set_error_handler(const std::function< void(int, const std::exception&, std::shared_ptr<restbed::Session>) >& error_callback) {
+    _resource->set_error_handler( error_callback );
+}
+
+void UmosapiService::publish() {
+    for (auto& http_word: _path.words) {
+        auto responses = _swagger["paths"][_path.name][http_word.name]["responses"];
+        if (responses.find("200") == responses.end()) {
+            _swagger["paths"][_path.name][http_word.name]["responses"]["200"]["description"] = "All is fine.";
+        }
+    }
+    _service.publish(_resource);
+}
+
+void UmosapiService::definition(std::string name, std::string type) {
+    _definition = Definition{name, type};
+    _definitions.defs.push_back(_definition);
+    _swagger["definitions"][name]["type"] = type;
+}
+
+void UmosapiService::propertie(std::string name, std::string format, std::string type, std::string required) {
+    _definition.props.push_back(Propertie{name, format, type, required});
+    _swagger["definitions"][_definition.name]["properties"][name]["format"] = format;
+    _swagger["definitions"][_definition.name]["properties"][name]["type"] = type;
+    if (required == "true") {
+        _swagger["definitions"][_definition.name]["required"].push_back(name);
+    }
+}
+
+void UmosapiService::consume(std::string consume) {
+    _swagger["paths"][_path.name][_path.words.back().name]["consumes"].push_back(consume);
+}
+
+void UmosapiService::produce(std::string produce) {
+    _swagger["paths"][_path.name][_path.words.back().name]["produces"].push_back(produce);
+}
+
+void UmosapiService::parameter(std::string name, std::string description, std::string schema = "") {
+    json parameter;
+    parameter["name"] = name;
+    parameter["description"] = description;
+    parameter["required"] = true;
+    if (schema == "") {
+        parameter["type"] = "string";
+        parameter["in"] = "path";
+    } else {
+        parameter["in"] = "body";
+        for (auto& def: _definitions.defs) {
+            if (def.name == schema ) {
+                std::string schema_path = "#/definitions/";
+                parameter["schema"]["$ref"] = schema_path.append(schema);
+            }
+        }
+    }
+    _swagger["paths"][_path.name][_path.words.back().name]["parameters"].push_back(parameter);
+}
+
+void UmosapiService::response(std::string http_code, std::string description, std::string definition) {
+    std::string schema = "#/definitions/";
+    _swagger["paths"][_path.name][_path.words.back().name]["responses"][http_code]["description"] = description;
+    _swagger["paths"][_path.name][_path.words.back().name]["responses"][http_code]["schema"]["items"]["$ref"] = schema.append(definition);
+    _swagger["paths"][_path.name][_path.words.back().name]["responses"][http_code]["schema"]["type"] = "array";
+}
+
+void UmosapiService::swagger(std::string ui_path, std::string swagger_dir, std::string api_path) {
+    _resource = make_shared< Resource > ();
+    _resource->set_path(ui_path);
+    _resource->set_method_handler("GET", swaggerEndpoint);
+    _service.publish(_resource);
+
+    _resource = make_shared< Resource > ();
+    _resource->set_path(ui_path + "/{filename: .*}");
+    _resource->set_method_handler("GET", swaggerEndpointResources);
+    _service.publish(_resource);
+
+    _resource = make_shared< Resource > ();
+    _resource->set_path(api_path);
+    _resource->set_method_handler("GET", swaggerEndpointApi);
+    _service.publish(_resource);
+}
+
+
+void UmosapiService::createResource() {
+    basePath("/v2");
+    description("Umosapi rest api");
+    version("0.1");
+    title("UMOSAPI");
+    host("127.0.0.1:"+config["port"]);
+
+    swagger("/doc", config["swaggerui"], "/api");
+
+    atag("uobject", "Everything about your UObjec");
+
+    scheme("http");
+    scheme("https");
+
+    definition("UObject", "object");
+    propertie("id", "int64", "integer", "true");
+    propertie("value", "string", "object", "true");
+
+    definition("UObjectSended", "object");
+
+    set_path("/v2/ready");
+    set_method_handler("GET", is_ready);
+    produce("application/json");
+    publish();
+
+    set_path("/v2/{mcollection: .*}");
+    set_method_handler("GET", retrieveAll);
+    produce("application/json");
+    parameter("mcollection", "Name of the collection where the uobject are located");
+    set_error_handler(resource_error_handler);
+    set_method_handler("POST", addUObject);
+    consume("application/json");
+    parameter("mcollection", "Name of the collection where the uobject are located");
+    parameter("body", "UObject to add", "UObjectSended");
+    set_error_handler(resource_error_handler);
+    publish();
+
+    set_path("/v2/{mcollection: .*}/{oid: .*}");
+    set_method_handler("DELETE", deleteUObject);
+    produce("application/json");
+    parameter("mcollection", "Name of the collection where the uobject are located" );
+    parameter("oid", "MongoDB oid of the uobject");
+    set_error_handler(resource_error_handler);
+    publish();
+
+    set_path("/v2/{mcollection: .*}/{key: .*}/{value: .*}");
+    set_method_handler("GET", searchUObjectByKeyValue);
+    produce("application/json");
+    parameter("mcollection", "Name of the collection where the uobject are located");
+    parameter("key", "Key of uobject to search, ex: kill or total.kill");
+    parameter("value", "Value of uobject to search, ex: 42");
+    set_error_handler(resource_error_handler);
+    publish();
+
+    _service.set_error_handler( service_error_handler );
+}
+
+void UmosapiService::retrieveAll( const shared_ptr<Session> session ){
+    auto jsonObjects = json_object_new_array();
+    const auto& request = session->get_request( );
+    auto json_string = uobject::retrieveAll(request->get_path_parameter( "mcollection" ), jsonObjects);
+    json_object_put(jsonObjects);
+
+    session->close( OK, json_string, {
+        { "Content-Length", ::to_string(json_string.length()) },
+        { "Content-Type", "application/json" } 
+    });
+}
+
+void UmosapiService::addUObject( const shared_ptr<Session> session ){
+    const auto request = session->get_request();
+
+    size_t content_length = request->get_header( "Content-Length", 0 );
+
+    session->fetch( content_length, [ request ]( const shared_ptr< Session > session, const Bytes & body )
+    {
+        auto jsonObject = json_object_new_object();
+        char bodyData[body.size()+1];
+        memset(bodyData, 0, sizeof(bodyData));
+        snprintf(bodyData, sizeof(bodyData), "%.*s", ( int ) body.size( ), body.data());
+        auto json_string = uobject::add(request->get_path_parameter("mcollection"), jsonObject, bodyData);
+        session->close( OK, json_string, {
+            { "Content-Length", ::to_string(json_string.length()) },
+            { "Content-Type", "application/json" } 
+        });
+        json_object_put(jsonObject);
+    } );
 }
 
-void UmosapiService::deleteUObject(const Rest::Request& request, Http::ResponseWriter response) {
+void UmosapiService::deleteUObject( const shared_ptr<Session> session ){
 
     auto jsonObject = json_object_new_object();
+    const auto request = session->get_request();
 
-    auto json_string = uobject::remove(request.param(":mcollection").as<string>(), request.param(":oid").as<string>(), jsonObject);
+    auto json_string = uobject::remove(request->get_path_parameter("mcollection"), request->get_path_parameter("oid"), jsonObject);
 
-    response.send(Http::Code::Ok, json_string, MIME(Application, Json));
+    session->close( OK, json_string, {
+        { "Content-Length", ::to_string(json_string.length()) },
+        { "Content-Type", "application/json" }
+    });
     json_object_put(jsonObject);
 }
 
-void UmosapiService::searchUObjectByKeyValue(const Rest::Request& request, Http::ResponseWriter response) {
+void UmosapiService::searchUObjectByKeyValue( const shared_ptr<Session> session ){
     auto jsonObject = json_object_new_array();
+    const auto request = session->get_request();
 
-    auto json_string = uobject::searchKeyValue(request.param(":mcollection").as<string>(), request.param(":key").as<string>(), request.param(":value").as<string>(), jsonObject);
+    auto json_string = uobject::searchKeyValue(request->get_path_parameter("mcollection"), request->get_path_parameter("key"), request->get_path_parameter("value"), jsonObject);
 
-    response.send(Http::Code::Ok, json_string, MIME(Application, Json));
+    session->close( OK, json_string, {
+        { "Content-Length", ::to_string(json_string.length()) },
+        { "Content-Type", "application/json" }
+    });
     json_object_put(jsonObject);
 }
+
+void UmosapiService::swaggerEndpoint( const shared_ptr<Session> session ){
+    const auto request = session->get_request();
+
+    ifstream stream(config["swaggerui"] + "/index.html", ifstream::in );
+
+    if ( stream.is_open() ) {
+        const string body = string( istreambuf_iterator< char >(stream), istreambuf_iterator< char>());
+
+        const multimap< string, string> headers {
+            { "Content-Type", "text/html" },
+            { "Content-Length", ::to_string( body.length() ) }
+        };
+        session->close(OK, body, headers);
+    } else {
+        session->close( NOT_FOUND );
+    }
+}
+
+void UmosapiService::swaggerEndpointResources( const shared_ptr< Session > session )
+{
+    const auto request = session->get_request( );
+    const string filename = request->get_path_parameter( "filename" );
+
+    ifstream stream( config["swaggerui"] + "/" + filename, ifstream::in );
+
+    if ( stream.is_open( ) )
+    {
+        const string body = string( istreambuf_iterator< char >( stream ), istreambuf_iterator< char >( ) );
+
+        const multimap< string, string > headers
+        {
+            { "Content-Length", ::to_string( body.length( ) ) }
+        };
+
+        session->close( OK, body, headers );
+    }
+    else
+    {
+        session->close( NOT_FOUND );
+    }
+}
+
+void UmosapiService::swaggerEndpointApi( const shared_ptr< Session > session )
+{
+    const auto request = session->get_request( );
+    const string filename = request->get_path_parameter( "filename" );
+    const string path = request->get_path();
+
+    ifstream stream( config["swaggerui"] + "/swagger.json", ifstream::in );
+
+    if ( stream.is_open( ) )
+    {
+        const string body = string( istreambuf_iterator< char >( stream ), istreambuf_iterator< char >( ) );
+
+        const multimap< string, string > headers
+        {
+            { "Content-Type", "application/json" },
+            { "Content-Length", ::to_string( body.length( ) ) }
+        };
+
+        session->close( OK, body, headers );
+    }
+    else
+    {
+        session->close( NOT_FOUND );
+    }
+}
diff --git a/api/umosapi.h b/api/umosapi.h
index 20c6d7b..a1765d7 100644
--- a/api/umosapi.h
+++ b/api/umosapi.h
@@ -1,37 +1,108 @@
 #ifndef UmosapiService_H_
 #define UmosapiService_H_
 
-#include <pistache/http.h>
-#include <pistache/description.h>
-#include <pistache/endpoint.h>
+//#include <pistache/http.h>
+//#include <pistache/description.h>
+//#include <pistache/endpoint.h>
 
-#include <pistache/serializer/rapidjson.h>
+#include <restbed>
 
-using namespace Pistache;
+//#include <pistache/serializer/rapidjson.h>
+
+#include <nlohmann/json.hpp>
+
+using namespace restbed;
+using namespace std;
+
+using json = nlohmann::json;
+
+struct tag {
+     std::string name;
+     std::string description;
+};
+
+struct Propertie {
+
+    std::string name;
+    std::string format;
+    std::string type;
+    std::string required;
+};
+
+struct Definition {
+
+    std::string name;
+    std::string type;
+    std::vector<Propertie> props;
+};
+
+struct Definitions {
+    std::vector<Definition> defs;
+};
+
+struct HttpWord {
+    std::string name;
+};
+
+struct Path {
+    std::string name;
+    std::vector<HttpWord> words;
+};
+
+struct Paths {
+    std::vector<Path> paths;
+};
 
 class UmosapiService {
     public:
 
-        UmosapiService(Address addr);
+        UmosapiService();
         virtual ~UmosapiService() {};
 
-        void init(size_t thr);
+        void init();
 
-        void start(std::string swaggerui);
+        void start(int, int);
+        Service _service;
+        json _swagger;
+        vector<tag> _tags;
 
     private:
-        void createDescription();
-
-        void retrieveAll(const Rest::Request& request, Http::ResponseWriter response);
+        void desc(std::string route, std::string http_word, const std::function< void ( const std::shared_ptr< Session > ) >& callback, const std::function< void(int, const std::exception&, std::shared_ptr<restbed::Session>) >& error_callback, tag tags[]);
+        void createResource();
 
-        void addUObject(const Rest::Request& request, Http::ResponseWriter response);
+        static void retrieveAll( const shared_ptr<Session> session );
+        static void addUObject( const shared_ptr<Session> session );
+        static void deleteUObject( const shared_ptr<Session> session );
+        static void searchUObjectByKeyValue( const shared_ptr<Session> session );
+        static void swaggerEndpoint( const shared_ptr<Session> session );
+        static void swaggerEndpointResources( const shared_ptr<Session> session );
+        static void swaggerEndpointApi( const shared_ptr<Session> session );
 
-        void deleteUObject(const Rest::Request& request, Http::ResponseWriter response);
+        shared_ptr< Resource> _resource;
+        Definition _definition;
+        Definitions _definitions;
+        Path _path;
+        Paths _paths;
+        void set_path();
+        void set_path(std::string route);
+        void set_method_handler(std::string http_word, const std::function< void ( const std::shared_ptr< Session > ) >& callback);
+        void set_error_handler(const std::function< void(int, const std::exception&, std::shared_ptr<restbed::Session>) >& error_callback);
+        void produce(std::string);
+        void consume(std::string);
+        void parameter(std::string, std::string, std::string);
+        void response(std::string err_code, std::string description, std::string schema);
+        void publish();
+        void basePath(std::string basePath);
+        void description(std::string description);
+        void title(std::string title);
+        void version(std::string version);
+        void host(std::string host);
+        void atag(std::string name, std::string description);
+        void scheme(std::string scheme);
 
-        void searchUObjectByKeyValue(const Rest::Request& request, Http::ResponseWriter response);
+        void definition(std::string name, std::string type);
+        void propertie(std::string name, std::string format, std::string type, std::string required);
+        void swagger(std::string ui_path, std::string swagger_dir, std::string api_path);
 
-        std::shared_ptr<Http::Endpoint> httpEndpoint;
-        Rest::Description desc;
-        Rest::Router router;
 };
 #endif