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241 lines
6.4 KiB
241 lines
6.4 KiB
#include "webfuse/ws/client.hpp"
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#include "webfuse/ws/url.hpp"
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#include <libwebsockets.h>
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#include <cstring>
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#include <iostream>
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#include <queue>
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#include <string>
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namespace
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{
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struct user_data
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{
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webfuse::ws_client_handler handler;
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std::function<void(bool)> connection_listener;
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struct lws * connection;
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std::string current_message;
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std::queue<webfuse::messagewriter> requests;
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};
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extern "C" int webfuse_client_callback(lws * wsi, lws_callback_reasons reason, void* user, void * in, size_t length)
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{
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int result = 0;
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lws_protocols const * protocol = lws_get_protocol(wsi);
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user_data * context = (nullptr != protocol) ? reinterpret_cast<user_data*>(protocol->user) : nullptr;
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if (nullptr != context)
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{
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switch(reason)
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{
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case LWS_CALLBACK_CLIENT_ESTABLISHED:
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context->connection_listener(true);
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break;
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case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
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context->connection = nullptr;
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context->requests = std::move(std::queue<webfuse::messagewriter>());
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context->current_message.clear();
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context->connection_listener(false);
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break;
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case LWS_CALLBACK_CLIENT_CLOSED:
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context->connection = nullptr;
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context->requests = std::move(std::queue<webfuse::messagewriter>());
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context->current_message.clear();
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context->connection_listener(false);
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break;
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case LWS_CALLBACK_CLIENT_RECEIVE:
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{
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auto * fragment = reinterpret_cast<char*>(in);
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context->current_message.append(fragment, length);
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if (0 != lws_is_final_fragment(wsi))
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{
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try
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{
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webfuse::messagereader reader(context->current_message);
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auto writer = context->handler(reader);
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context->requests.emplace(std::move(writer));
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lws_callback_on_writable(wsi);
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}
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catch(...)
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{
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// ToDo: log
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std::cerr << "error: failed to create response" << std::endl;
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}
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}
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}
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break;
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case LWS_CALLBACK_SERVER_WRITEABLE:
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// fall-through
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case LWS_CALLBACK_CLIENT_WRITEABLE:
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{
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if (!context->requests.empty())
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{
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auto writer = std::move(context->requests.front());
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context->requests.pop();
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size_t size;
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auto * data = writer.get_data(size);
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lws_write(wsi, data, size, LWS_WRITE_BINARY);
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}
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if (!context->requests.empty())
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{
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lws_callback_on_writable(wsi);
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}
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}
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break;
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default:
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break;
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}
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}
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return result;
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}
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}
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namespace webfuse
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{
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class ws_client::detail
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{
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detail(detail const &) = delete;
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detail& operator=(detail const &) = delete;
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detail(detail &&) = delete;
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detail& operator=(detail &&) = delete;
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public:
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detail(std::string const & ca_path, ws_client_handler handler)
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{
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lws_set_log_level(0, nullptr);
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memset(reinterpret_cast<void*>(protocols), 0, sizeof(lws_protocols) * 2);
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protocols[0].callback = &webfuse_client_callback;
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protocols[0].name = "webfuse2-client";
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protocols[0].per_session_data_size = 0;
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protocols[0].user = reinterpret_cast<void*>(&data);
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memset(reinterpret_cast<void*>(&info), 0, sizeof(lws_context_creation_info));
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info.port = CONTEXT_PORT_NO_LISTEN;
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info.protocols = protocols;
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info.uid = -1;
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info.gid = -1;
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info.options = LWS_SERVER_OPTION_EXPLICIT_VHOSTS;
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data.handler = handler;
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data.connection_listener = [](bool){ };
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data.connection = nullptr;
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context = lws_create_context(&info);
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struct lws_vhost * vhost = lws_create_vhost(context, &info);
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info.options |= LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
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if (!ca_path.empty())
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{
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info.client_ssl_ca_filepath = ca_path.c_str();
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}
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lws_init_vhost_client_ssl(&info, vhost);
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}
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~detail()
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{
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lws_context_destroy(context);
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}
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void connect(std::string const & url)
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{
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ws_url parsed_url(url);
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lws_client_connect_info info;
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memset(reinterpret_cast<void*>(&info), 0, sizeof(lws_client_connect_info));
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info.context = context;
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info.port = parsed_url.port;
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info.address = parsed_url.hostname.c_str();
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info.host = info.address;
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info.path = parsed_url.path.c_str();
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info.origin = info.address;
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info.ssl_connection = (parsed_url.use_tls) ? LCCSCF_USE_SSL : 0;
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info.protocol = "webfuse2";
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info.local_protocol_name = "webfuse2-client";
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info.pwsi = &data.connection;
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lws_client_connect_via_info(&info);
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}
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void service()
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{
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lws_service(context, 0);
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}
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void interrupt()
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{
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lws_cancel_service(context);
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}
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void set_connection_listener(std::function<void(bool)> listener)
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{
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data.connection_listener = listener;
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}
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private:
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lws_context_creation_info info;
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lws_protocols protocols[2];
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lws_context * context;
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user_data data;
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};
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ws_client::ws_client(std::string const & ca_path, ws_client_handler handler)
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: d(new detail(ca_path, handler))
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{
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}
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ws_client::~ws_client()
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{
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delete d;
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}
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ws_client::ws_client(ws_client && other)
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{
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this->d = other.d;
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other.d = nullptr;
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}
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ws_client& ws_client::operator=(ws_client && other)
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{
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if (this != &other)
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{
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delete this->d;
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this->d = other.d;
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other.d = nullptr;
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}
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return *this;
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}
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void ws_client::connect(std::string url)
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{
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d->connect(url);
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}
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void ws_client::service()
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{
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d->service();
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}
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void ws_client::interrupt()
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{
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d->interrupt();
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}
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void ws_client::set_connection_listener(std::function<void(bool)> listener)
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{
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d->set_connection_listener(listener);
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}
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}
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