Rework HTTP client to use keepalive, move getifaddr_list to addr_util
This commit is contained in:
Vitaliy Filippov
+269
-304
@@ -4,9 +4,7 @@
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#include <netinet/tcp.h>
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#include <sys/epoll.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <ifaddrs.h>
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#include <ctype.h>
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#include <unistd.h>
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@@ -25,11 +23,12 @@
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static std::string trim(const std::string & in);
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static std::string ws_format_frame(int type, uint64_t size);
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static bool ws_parse_frame(std::string & buf, int & type, std::string & res);
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static void parse_http_headers(std::string & res, http_response_t *parsed);
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// FIXME: Use keepalive
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struct http_co_t
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{
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timerfd_manager_t *tfd;
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std::function<void(const http_response_t*)> response_callback;
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int request_timeout = 0;
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std::string host;
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@@ -37,11 +36,12 @@ struct http_co_t
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std::string ws_outbox;
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std::string response;
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bool want_streaming;
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bool keepalive;
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http_response_t parsed;
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uint64_t target_response_size = 0;
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std::vector<std::function<void()>> keepalive_queue;
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int state = 0;
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std::string connected_host;
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int peer_fd = -1;
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int timeout_id = -1;
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int epoll_events = 0;
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@@ -49,10 +49,8 @@ struct http_co_t
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std::vector<char> rbuf;
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iovec read_iov, send_iov;
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msghdr read_msg = { 0 }, send_msg = { 0 };
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std::function<void(const http_response_t*)> callback;
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websocket_t ws;
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http_response_t parsed;
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uint64_t target_response_size = 0;
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int onstack = 0;
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bool ended = false;
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@@ -62,65 +60,39 @@ struct http_co_t
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inline void stackout() { onstack--; if (!onstack && ended) end(); }
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inline void end() { ended = true; if (!onstack) { delete this; } }
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void start_connection();
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void close_connection();
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void handle_events();
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void handle_connect_result();
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void submit_read();
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void submit_send();
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bool handle_read();
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void fill_parsed_response();
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void post_message(int type, const std::string & msg);
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void send_request(const std::string & host, const std::string & request,
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const http_options_t & options, std::function<void(const http_response_t *response)> response_callback);
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};
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#define HTTP_CO_CLOSED 0
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#define HTTP_CO_CONNECTING 1
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#define HTTP_CO_SENDING_REQUEST 2
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#define HTTP_CO_REQUEST_SENT 3
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#define HTTP_CO_HEADERS_RECEIVED 4
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#define HTTP_CO_WEBSOCKET 5
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#define HTTP_CO_CHUNKED 6
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#define HTTP_CO_KEEPALIVE 7
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#define DEFAULT_TIMEOUT 5000
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void http_request(timerfd_manager_t *tfd, const std::string & host, const std::string & request,
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const http_options_t & options, std::function<void(const http_response_t *response)> callback)
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http_co_t *http_init(timerfd_manager_t *tfd)
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{
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http_co_t *handler = new http_co_t();
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handler->request_timeout = options.timeout < 0 ? 0 : (options.timeout == 0 ? DEFAULT_TIMEOUT : options.timeout);
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handler->want_streaming = options.want_streaming;
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handler->tfd = tfd;
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handler->host = host;
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handler->request = request;
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handler->callback = callback;
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handler->ws.co = handler;
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handler->start_connection();
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handler->state = HTTP_CO_CLOSED;
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return handler;
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}
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void http_request_json(timerfd_manager_t *tfd, const std::string & host, const std::string & request,
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int timeout, std::function<void(std::string, json11::Json r)> callback)
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{
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http_request(tfd, host, request, { .timeout = timeout }, [callback](const http_response_t* res)
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{
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if (res->error_code != 0)
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{
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callback("Error code: "+std::to_string(res->error_code)+" ("+std::string(strerror(res->error_code))+")", json11::Json());
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return;
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}
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if (res->status_code != 200)
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{
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callback("HTTP "+std::to_string(res->status_code)+" "+res->status_line+" body: "+trim(res->body), json11::Json());
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return;
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}
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std::string json_err;
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json11::Json data = json11::Json::parse(res->body, json_err);
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if (json_err != "")
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{
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callback("Bad JSON: "+json_err+" (response: "+trim(res->body)+")", json11::Json());
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return;
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}
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callback(std::string(), data);
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});
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}
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websocket_t* open_websocket(timerfd_manager_t *tfd, const std::string & host, const std::string & path,
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int timeout, std::function<void(const http_response_t *msg)> callback)
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http_co_t* open_websocket(timerfd_manager_t *tfd, const std::string & host, const std::string & path,
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int timeout, std::function<void(const http_response_t *msg)> response_callback)
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{
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std::string request = "GET "+path+" HTTP/1.1\r\n"
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"Host: "+host+"\r\n"
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@@ -130,40 +102,145 @@ websocket_t* open_websocket(timerfd_manager_t *tfd, const std::string & host, co
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"Sec-WebSocket-Version: 13\r\n"
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"\r\n";
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http_co_t *handler = new http_co_t();
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handler->tfd = tfd;
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handler->state = HTTP_CO_CLOSED;
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handler->host = host;
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handler->request_timeout = timeout < 0 ? -1 : (timeout == 0 ? DEFAULT_TIMEOUT : timeout);
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handler->want_streaming = false;
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handler->tfd = tfd;
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handler->host = host;
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handler->keepalive = false;
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handler->request = request;
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handler->callback = callback;
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handler->ws.co = handler;
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handler->response_callback = response_callback;
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handler->start_connection();
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return &handler->ws;
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return handler;
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}
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void websocket_t::post_message(int type, const std::string & msg)
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void http_request(http_co_t *handler, const std::string & host, const std::string & request,
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const http_options_t & options, std::function<void(const http_response_t *response)> response_callback)
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{
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co->post_message(type, msg);
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handler->send_request(host, request, options, response_callback);
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}
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void websocket_t::close()
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void http_co_t::send_request(const std::string & host, const std::string & request,
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const http_options_t & options, std::function<void(const http_response_t *response)> response_callback)
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{
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co->end();
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stackin();
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if (state == HTTP_CO_WEBSOCKET)
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{
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stackout();
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throw std::runtime_error("Attempt to send HTTP request into a websocket or chunked stream");
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}
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else if (state != HTTP_CO_KEEPALIVE && state != HTTP_CO_CLOSED)
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{
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keepalive_queue.push_back([this, host, request, options, response_callback]()
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{
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this->send_request(host, request, options, response_callback);
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});
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stackout();
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return;
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}
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this->request_timeout = options.timeout < 0 ? 0 : (options.timeout == 0 ? DEFAULT_TIMEOUT : options.timeout);
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this->want_streaming = options.want_streaming;
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this->keepalive = options.keepalive;
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this->host = host;
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this->request = request;
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this->response = "";
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this->sent = 0;
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this->response_callback = response_callback;
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if (state == HTTP_CO_KEEPALIVE && connected_host != host)
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{
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close_connection();
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}
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if (request_timeout > 0)
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{
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timeout_id = tfd->set_timer(request_timeout, false, [this](int timer_id)
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{
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stackin();
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close_connection();
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parsed = { .error = "HTTP request timed out" };
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this->response_callback(&parsed);
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this->response_callback = NULL;
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stackout();
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});
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}
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if (state == HTTP_CO_KEEPALIVE)
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{
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state = HTTP_CO_SENDING_REQUEST;
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submit_send();
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}
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else
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{
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start_connection();
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}
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stackout();
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}
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void http_post_message(http_co_t *handler, int type, const std::string & msg)
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{
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handler->post_message(type, msg);
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}
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void http_co_t::post_message(int type, const std::string & msg)
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{
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stackin();
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if (state == HTTP_CO_WEBSOCKET)
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{
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request += ws_format_frame(type, msg.size());
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request += msg;
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submit_send();
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}
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else if (state == HTTP_CO_KEEPALIVE || state == HTTP_CO_CHUNKED)
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{
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throw std::runtime_error("Attempt to send websocket message on a regular HTTP connection");
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}
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else
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{
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ws_outbox += ws_format_frame(type, msg.size());
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ws_outbox += msg;
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}
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stackout();
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}
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void http_close(http_co_t *handler)
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{
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handler->end();
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}
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void http_response_t::parse_json_response(std::string & error, json11::Json & r) const
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{
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if (this->error != "")
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{
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error = this->error;
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r = json11::Json();
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}
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else if (status_code != 200)
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{
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error = "HTTP "+std::to_string(status_code)+" "+status_line+" body: "+trim(body);
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r = json11::Json();
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}
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else
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{
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std::string json_err;
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json11::Json data = json11::Json::parse(body, json_err);
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if (json_err != "")
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{
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error = "Bad JSON: "+json_err+" (response: "+trim(body)+")";
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r = json11::Json();
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}
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else
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{
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error = "";
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r = data;
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}
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}
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}
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http_co_t::~http_co_t()
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{
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if (timeout_id >= 0)
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{
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tfd->clear_timer(timeout_id);
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timeout_id = -1;
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}
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if (peer_fd >= 0)
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{
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tfd->set_fd_handler(peer_fd, false, NULL);
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close(peer_fd);
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peer_fd = -1;
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}
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close_connection();
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}
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void http_co_t::fill_parsed_response()
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{
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if (parsed.headers["transfer-encoding"] == "chunked")
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{
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int prev = 0, pos = 0;
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@@ -178,8 +255,24 @@ http_co_t::~http_co_t()
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{
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std::swap(parsed.body, response);
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}
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parsed.eof = true;
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callback(&parsed);
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}
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void http_co_t::close_connection()
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{
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if (timeout_id >= 0)
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{
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tfd->clear_timer(timeout_id);
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timeout_id = -1;
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}
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if (peer_fd >= 0)
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{
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tfd->set_fd_handler(peer_fd, false, NULL);
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close(peer_fd);
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peer_fd = -1;
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}
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state = HTTP_CO_CLOSED;
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connected_host = "";
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response = "";
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}
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void http_co_t::start_connection()
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@@ -188,39 +281,31 @@ void http_co_t::start_connection()
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struct sockaddr addr;
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if (!string_to_addr(host.c_str(), 1, 80, &addr))
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{
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parsed.error_code = ENXIO;
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parsed = { .error = "Invalid address: "+host };
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response_callback(&parsed);
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response_callback = NULL;
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stackout();
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end();
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return;
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}
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peer_fd = socket(addr.sa_family, SOCK_STREAM, 0);
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if (peer_fd < 0)
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{
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parsed.error_code = errno;
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parsed = { .error = std::string("socket: ")+strerror(errno) };
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response_callback(&parsed);
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response_callback = NULL;
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stackout();
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end();
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return;
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}
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fcntl(peer_fd, F_SETFL, fcntl(peer_fd, F_GETFL, 0) | O_NONBLOCK);
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if (request_timeout > 0)
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{
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timeout_id = tfd->set_timer(request_timeout, false, [this](int timer_id)
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{
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if (response.length() == 0)
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{
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parsed.error_code = ETIME;
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}
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end();
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});
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}
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epoll_events = 0;
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// Finally call connect
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int r = ::connect(peer_fd, (sockaddr*)&addr, sizeof(addr));
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if (r < 0 && errno != EINPROGRESS)
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{
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parsed.error_code = errno;
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parsed = { .error = std::string("connect: ")+strerror(errno) };
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response_callback(&parsed);
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response_callback = NULL;
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stackout();
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end();
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return;
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}
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tfd->set_fd_handler(peer_fd, true, [this](int peer_fd, int epoll_events)
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@@ -228,6 +313,7 @@ void http_co_t::start_connection()
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this->epoll_events |= epoll_events;
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handle_events();
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});
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connected_host = host;
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state = HTTP_CO_CONNECTING;
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stackout();
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}
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@@ -250,7 +336,14 @@ void http_co_t::handle_events()
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}
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else if (epoll_events & (EPOLLRDHUP|EPOLLERR))
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{
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end();
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close_connection();
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if (response_callback != NULL)
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{
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parsed.eof = true;
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response_callback(&parsed);
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response_callback = NULL;
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parsed = {};
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}
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break;
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}
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}
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@@ -269,9 +362,11 @@ void http_co_t::handle_connect_result()
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}
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if (result != 0)
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{
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parsed.error_code = result;
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close_connection();
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parsed = { .error = std::string("connect: ")+strerror(result) };
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response_callback(&parsed);
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response_callback = NULL;
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stackout();
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end();
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return;
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}
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int one = 1;
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@@ -286,6 +381,49 @@ void http_co_t::handle_connect_result()
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stackout();
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}
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void http_co_t::submit_send()
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{
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stackin();
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int res;
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again:
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if (sent < request.size())
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{
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send_iov = (iovec){ .iov_base = (void*)(request.c_str()+sent), .iov_len = request.size()-sent };
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send_msg.msg_iov = &send_iov;
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send_msg.msg_iovlen = 1;
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res = sendmsg(peer_fd, &send_msg, MSG_NOSIGNAL);
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if (res < 0)
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{
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res = -errno;
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}
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if (res == -EAGAIN)
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{
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res = 0;
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}
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else if (res < 0)
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{
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stackout();
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end();
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return;
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}
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sent += res;
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if (state == HTTP_CO_SENDING_REQUEST)
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{
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if (sent >= request.size())
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state = HTTP_CO_REQUEST_SENT;
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else
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goto again;
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}
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else if (state == HTTP_CO_WEBSOCKET)
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{
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request = request.substr(sent);
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sent = 0;
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goto again;
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}
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}
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stackout();
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}
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void http_co_t::submit_read()
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{
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stackin();
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@@ -321,51 +459,6 @@ void http_co_t::submit_read()
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stackout();
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}
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void http_co_t::submit_send()
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{
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stackin();
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int res;
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again:
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if (sent < request.size())
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{
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send_iov = (iovec){ .iov_base = (void*)(request.c_str()+sent), .iov_len = request.size()-sent };
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send_msg.msg_iov = &send_iov;
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send_msg.msg_iovlen = 1;
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res = sendmsg(peer_fd, &send_msg, MSG_NOSIGNAL);
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if (res < 0)
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{
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res = -errno;
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}
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if (res == -EAGAIN)
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{
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res = 0;
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}
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else if (res < 0)
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{
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stackout();
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end();
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return;
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}
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sent += res;
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if (state == HTTP_CO_SENDING_REQUEST)
|
||||
{
|
||||
if (sent >= request.size())
|
||||
{
|
||||
state = HTTP_CO_REQUEST_SENT;
|
||||
}
|
||||
else
|
||||
goto again;
|
||||
}
|
||||
else if (state == HTTP_CO_WEBSOCKET)
|
||||
{
|
||||
request = request.substr(sent);
|
||||
sent = 0;
|
||||
goto again;
|
||||
}
|
||||
}
|
||||
stackout();
|
||||
}
|
||||
|
||||
bool http_co_t::handle_read()
|
||||
{
|
||||
stackin();
|
||||
@@ -376,6 +469,7 @@ bool http_co_t::handle_read()
|
||||
{
|
||||
if (timeout_id >= 0)
|
||||
{
|
||||
// Timeout is cleared when headers are received
|
||||
tfd->clear_timer(timeout_id);
|
||||
timeout_id = -1;
|
||||
}
|
||||
@@ -403,20 +497,27 @@ bool http_co_t::handle_read()
|
||||
if (!target_response_size)
|
||||
{
|
||||
// Sorry, unsupported response
|
||||
close_connection();
|
||||
parsed = { .error = "Response has neither Connection: close, nor Transfer-Encoding: chunked nor Content-Length headers" };
|
||||
response_callback(&parsed);
|
||||
response_callback = NULL;
|
||||
stackout();
|
||||
end();
|
||||
return false;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
keepalive = false;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (state == HTTP_CO_HEADERS_RECEIVED && target_response_size > 0 && response.size() >= target_response_size)
|
||||
{
|
||||
stackout();
|
||||
end();
|
||||
return false;
|
||||
fill_parsed_response();
|
||||
response_callback(&parsed);
|
||||
parsed.eof = true;
|
||||
}
|
||||
if (state == HTTP_CO_CHUNKED && response.size() > 0)
|
||||
else if (state == HTTP_CO_CHUNKED && response.size() > 0)
|
||||
{
|
||||
int prev = 0, pos = 0;
|
||||
while ((pos = response.find("\r\n", prev)) >= prev)
|
||||
@@ -439,55 +540,49 @@ bool http_co_t::handle_read()
|
||||
{
|
||||
response = response.substr(prev);
|
||||
}
|
||||
if (parsed.eof)
|
||||
if (want_streaming)
|
||||
{
|
||||
stackout();
|
||||
end();
|
||||
return false;
|
||||
}
|
||||
if (want_streaming && parsed.body.size() > 0)
|
||||
{
|
||||
if (!ended)
|
||||
{
|
||||
// Don't deliver additional events after close()
|
||||
callback(&parsed);
|
||||
}
|
||||
// Streaming response
|
||||
response_callback(&parsed);
|
||||
parsed.body = "";
|
||||
}
|
||||
if (parsed.eof && !want_streaming)
|
||||
{
|
||||
// Normal response
|
||||
response_callback(&parsed);
|
||||
}
|
||||
}
|
||||
if (state == HTTP_CO_WEBSOCKET && response.size() > 0)
|
||||
else if (state == HTTP_CO_WEBSOCKET && response.size() > 0)
|
||||
{
|
||||
while (ws_parse_frame(response, parsed.ws_msg_type, parsed.body))
|
||||
{
|
||||
if (!ended)
|
||||
{
|
||||
// Don't deliver additional events after close()
|
||||
callback(&parsed);
|
||||
}
|
||||
response_callback(&parsed);
|
||||
parsed.body = "";
|
||||
}
|
||||
}
|
||||
if (parsed.eof)
|
||||
{
|
||||
response_callback = NULL;
|
||||
parsed = {};
|
||||
if (!keepalive)
|
||||
{
|
||||
close_connection();
|
||||
}
|
||||
else
|
||||
{
|
||||
state = HTTP_CO_KEEPALIVE;
|
||||
if (keepalive_queue.size() > 0)
|
||||
{
|
||||
auto next = keepalive_queue[0];
|
||||
keepalive_queue.erase(keepalive_queue.begin(), keepalive_queue.begin()+1);
|
||||
next();
|
||||
}
|
||||
}
|
||||
}
|
||||
stackout();
|
||||
return true;
|
||||
}
|
||||
|
||||
void http_co_t::post_message(int type, const std::string & msg)
|
||||
{
|
||||
stackin();
|
||||
if (state == HTTP_CO_WEBSOCKET)
|
||||
{
|
||||
request += ws_format_frame(type, msg.size());
|
||||
request += msg;
|
||||
submit_send();
|
||||
}
|
||||
else
|
||||
{
|
||||
ws_outbox += ws_format_frame(type, msg.size());
|
||||
ws_outbox += msg;
|
||||
}
|
||||
stackout();
|
||||
}
|
||||
|
||||
uint64_t stoull_full(const std::string & str, int base)
|
||||
{
|
||||
if (isspace(str[0]))
|
||||
@@ -503,7 +598,7 @@ uint64_t stoull_full(const std::string & str, int base)
|
||||
return r;
|
||||
}
|
||||
|
||||
void parse_http_headers(std::string & res, http_response_t *parsed)
|
||||
static void parse_http_headers(std::string & res, http_response_t *parsed)
|
||||
{
|
||||
int pos = res.find("\r\n");
|
||||
pos = pos < 0 ? res.length() : pos+2;
|
||||
@@ -625,136 +720,6 @@ static bool ws_parse_frame(std::string & buf, int & type, std::string & res)
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool cidr_match(const in_addr &addr, const in_addr &net, uint8_t bits)
|
||||
{
|
||||
if (bits == 0)
|
||||
{
|
||||
// C99 6.5.7 (3): u32 << 32 is undefined behaviour
|
||||
return true;
|
||||
}
|
||||
return !((addr.s_addr ^ net.s_addr) & htonl(0xFFFFFFFFu << (32 - bits)));
|
||||
}
|
||||
|
||||
static bool cidr6_match(const in6_addr &address, const in6_addr &network, uint8_t bits)
|
||||
{
|
||||
const uint32_t *a = address.s6_addr32;
|
||||
const uint32_t *n = network.s6_addr32;
|
||||
int bits_whole, bits_incomplete;
|
||||
bits_whole = bits >> 5; // number of whole u32
|
||||
bits_incomplete = bits & 0x1F; // number of bits in incomplete u32
|
||||
if (bits_whole && memcmp(a, n, bits_whole << 2))
|
||||
return false;
|
||||
if (bits_incomplete)
|
||||
{
|
||||
uint32_t mask = htonl((0xFFFFFFFFu) << (32 - bits_incomplete));
|
||||
if ((a[bits_whole] ^ n[bits_whole]) & mask)
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
struct addr_mask_t
|
||||
{
|
||||
sa_family_t family;
|
||||
in_addr ipv4;
|
||||
in6_addr ipv6;
|
||||
uint8_t bits;
|
||||
};
|
||||
|
||||
std::vector<std::string> getifaddr_list(json11::Json mask_cfg, bool include_v6)
|
||||
{
|
||||
std::vector<addr_mask_t> masks;
|
||||
if (mask_cfg.is_string())
|
||||
{
|
||||
mask_cfg = json11::Json::array{ mask_cfg };
|
||||
}
|
||||
for (auto mask_json: mask_cfg.array_items())
|
||||
{
|
||||
std::string mask = mask_json.string_value();
|
||||
unsigned bits = 0;
|
||||
int p = mask.find('/');
|
||||
if (p != std::string::npos)
|
||||
{
|
||||
char null_byte = 0;
|
||||
if (sscanf(mask.c_str()+p+1, "%u%c", &bits, &null_byte) != 1 || bits > 128)
|
||||
{
|
||||
throw std::runtime_error((include_v6 ? "Invalid IPv4 address mask: " : "Invalid IP address mask: ") + mask);
|
||||
}
|
||||
mask = mask.substr(0, p);
|
||||
}
|
||||
in_addr ipv4;
|
||||
in6_addr ipv6;
|
||||
if (inet_pton(AF_INET, mask.c_str(), &ipv4) == 1)
|
||||
{
|
||||
if (bits > 32)
|
||||
{
|
||||
throw std::runtime_error((include_v6 ? "Invalid IPv4 address mask: " : "Invalid IP address mask: ") + mask);
|
||||
}
|
||||
masks.push_back((addr_mask_t){ .family = AF_INET, .ipv4 = ipv4, .bits = (uint8_t)bits });
|
||||
}
|
||||
else if (include_v6 && inet_pton(AF_INET6, mask.c_str(), &ipv6) == 1)
|
||||
{
|
||||
masks.push_back((addr_mask_t){ .family = AF_INET6, .ipv6 = ipv6, .bits = (uint8_t)bits });
|
||||
}
|
||||
else
|
||||
{
|
||||
throw std::runtime_error((include_v6 ? "Invalid IPv4 address mask: " : "Invalid IP address mask: ") + mask);
|
||||
}
|
||||
}
|
||||
std::vector<std::string> addresses;
|
||||
ifaddrs *list, *ifa;
|
||||
if (getifaddrs(&list) == -1)
|
||||
{
|
||||
throw std::runtime_error(std::string("getifaddrs: ") + strerror(errno));
|
||||
}
|
||||
for (ifa = list; ifa != NULL; ifa = ifa->ifa_next)
|
||||
{
|
||||
if (!ifa->ifa_addr)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
int family = ifa->ifa_addr->sa_family;
|
||||
if ((family == AF_INET || family == AF_INET6 && include_v6) &&
|
||||
(ifa->ifa_flags & (IFF_UP | IFF_RUNNING | IFF_LOOPBACK)) == (IFF_UP | IFF_RUNNING))
|
||||
{
|
||||
void *addr_ptr;
|
||||
if (family == AF_INET)
|
||||
{
|
||||
addr_ptr = &((sockaddr_in *)ifa->ifa_addr)->sin_addr;
|
||||
}
|
||||
else
|
||||
{
|
||||
addr_ptr = &((sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
|
||||
}
|
||||
if (masks.size() > 0)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < masks.size(); i++)
|
||||
{
|
||||
if (masks[i].family == family && (family == AF_INET
|
||||
? cidr_match(*(in_addr*)addr_ptr, masks[i].ipv4, masks[i].bits)
|
||||
: cidr6_match(*(in6_addr*)addr_ptr, masks[i].ipv6, masks[i].bits)))
|
||||
{
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (i >= masks.size())
|
||||
{
|
||||
continue;
|
||||
}
|
||||
}
|
||||
char addr[INET6_ADDRSTRLEN];
|
||||
if (!inet_ntop(family, addr_ptr, addr, INET6_ADDRSTRLEN))
|
||||
{
|
||||
throw std::runtime_error(std::string("inet_ntop: ") + strerror(errno));
|
||||
}
|
||||
addresses.push_back(std::string(addr));
|
||||
}
|
||||
}
|
||||
freeifaddrs(list);
|
||||
return addresses;
|
||||
}
|
||||
|
||||
std::string strtolower(const std::string & in)
|
||||
{
|
||||
std::string s = in;
|
||||
|
||||
Reference in New Issue
Block a user