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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2017-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_WEB_SOCKET_COMMAND_REVERSE_SERVER_H_
#define _PASSENGER_WEB_SOCKET_COMMAND_REVERSE_SERVER_H_
#include <websocketpp/config/asio_no_tls_client.hpp>
#include <websocketpp/client.hpp>
#include <boost/make_shared.hpp>
#include <boost/function.hpp>
#include <oxt/backtrace.hpp>
#include <oxt/macros.hpp>
#include <string>
#include <vector>
#include <deque>
#include <cstring>
#include <jsoncpp/json.h>
#include <modp_b64.h>
#include <LoggingKit/Logging.h>
#include <ConfigKit/ConfigKit.h>
#include <ConfigKit/AsyncUtils.h>
#include <Exceptions.h>
#include <FileTools/PathManip.h>
#include <FileTools/FileManip.h>
#include <Utils.h>
#include <StrIntTools/StrIntUtils.h>
namespace Passenger {
using namespace std;
#define WCRS_DEBUG_FRAME(self, expr1, expr2) \
P_LOG_UNLIKELY(Passenger::LoggingKit::context, \
(self)->_getDataDebugLevel(), \
__FILE__, __LINE__, \
(self)->_getLogPrefix() << expr1 << " \"" \
<< cEscapeString(expr2) << "\"")
/**
* A generic WebSocket command "server" that implements a request/response
* model.
*
* The reason why the name contains the word "reverse" is because it doesn't
* actually listens on a port. Instead, it connects to a port and receives
* commands from there.
*
* This class is generic in the sense that it handles all sorts of connection
* management logic such as reconnecting on failure, handling pings, timeouts,
* configuration, basic flow control, etc. It doesn't contain any logic for
* actually handling incoming commands: you are supposed to supply a function
* for handling incoming commands (the message handler). This allows seperating
* all the connection management logic from the actual message handling
* business logic.
*
* ## Usage
*
* static bool
* onMessage(WebSocketCommandReverseServer *server,
* const WebSocketCommandReverseServer::ConnectionPtr &conn,
* const WebSocketCommandReverseServer::MessagePtr &msg)
* {
* P_INFO("Message received: " << msg->get_payload());
* conn->send("Echo: " + msg->get_payload());
* return true;
* }
*
*
* // Set configuration
* Json::Value config;
* config["url"] = "ws://127.0.0.1:8001/";
*
* // Create and initialize the server
* WebSocketCommandReverseServer::Schema schema;
* WebSocketCommandReverseServer server(schema, onMessage, config);
* server.initialize();
*
* // Enter the server's main loop. This blocks until something
* // calls `server.shutdown()`.
* server.run();
*
* ## About the concurrency and I/O model
*
* WebSocketCommandReverseServer uses the WebSocket++ library and the
* Boost Asio I/O library. WebSocketCommandReverseServer manages its own
* event loop.
*
* The message handler will be called from the event loop's thread, so
* be careful.
*
* ## About flow control and backpressure
*
* We purposefully do not implement any flow control/backpressure on the
* WebSocket's _writing_ side. That is, if we send a large amount of data to
* the remote, then we do not wait until all that data has actually been
* sent out before proceeding to read the next message. Unfortunately the
* WebSocket++ API does not allow us to efficiently implement that:
* https://github.com/zaphoyd/websocketpp/issues/477
*
* As of 4 September 2017 (Boost 1.64.0, WebSocket++ 0.7.0),
* we also do not implement any flow control/backpressure
* on the WebSocket's _reading_ side. If the server floods us with requests
* then all of them will be buffered. We are unable to implement flow control
* on the reading side because of a bug in either WebSocket++ or ASIO: if you
* pause/resume the WebSocket then it results in data loss or data corruption.
*
* So the server is responsible for ensuring that it does not overload the
* WebSocketCommandReverseServer.
*/
class WebSocketCommandReverseServer {
public:
/*
* BEGIN ConfigKit schema: Passenger::WebSocketCommandReverseServer::Schema
* (do not edit: following text is automatically generated
* by 'rake configkit_schemas_inline_comments')
*
* auth_type string - default("basic")
* close_timeout float - default(10.0)
* connect_timeout float - default(30.0)
* data_debug boolean - default(false)
* log_prefix string - -
* password string - secret
* password_file string - -
* ping_interval float - default(30.0)
* ping_timeout float - default(30.0)
* proxy_password string - secret
* proxy_timeout float - default(30.0)
* proxy_url string - -
* proxy_username string - -
* reconnect_timeout float - default(5.0)
* url string required -
* username string - -
* websocketpp_debug_access boolean - default(false)
* websocketpp_debug_error boolean - default(false)
*
* END
*/
class Schema: public ConfigKit::Schema {
private:
void initialize() {
using namespace ConfigKit;
add("url", STRING_TYPE, REQUIRED);
add("log_prefix", STRING_TYPE, OPTIONAL);
add("websocketpp_debug_access", BOOL_TYPE, OPTIONAL, false);
add("websocketpp_debug_error", BOOL_TYPE, OPTIONAL, false);
add("data_debug", BOOL_TYPE, OPTIONAL, false);
add("auth_type", STRING_TYPE, OPTIONAL, "basic");
add("username", STRING_TYPE, OPTIONAL);
add("password", STRING_TYPE, OPTIONAL | SECRET);
add("password_file", STRING_TYPE, OPTIONAL);
add("proxy_url", STRING_TYPE, OPTIONAL);
add("proxy_username", STRING_TYPE, OPTIONAL);
add("proxy_password", STRING_TYPE, OPTIONAL | SECRET);
add("proxy_timeout", FLOAT_TYPE, OPTIONAL, 30.0);
add("connect_timeout", FLOAT_TYPE, OPTIONAL, 30.0);
add("ping_interval", FLOAT_TYPE, OPTIONAL, 30.0);
add("ping_timeout", FLOAT_TYPE, OPTIONAL, 30.0);
add("close_timeout", FLOAT_TYPE, OPTIONAL, 10.0);
add("reconnect_timeout", FLOAT_TYPE, OPTIONAL, 5.0);
addValidator(validateAuthentication);
addNormalizer(normalizeAuthentication);
}
static void validateAuthentication(const ConfigKit::Store &config, vector<ConfigKit::Error> &errors) {
typedef ConfigKit::Error Error;
// url is required, but Core::Schema overrides it to be optional.
if (config["url"].isNull() || config["auth_type"].asString() == "none") {
return;
}
if (config["auth_type"].asString() != "basic") {
errors.push_back(Error("Unsupported '{{auth_type}}' value"
" (only 'none' and 'basic' are supported)"));
}
if (config["auth_type"].asString() == "basic") {
if (config["username"].isNull()) {
errors.push_back(Error(
"When '{{auth_type}}' is set to 'basic', '{{username}}' must also be set"));
}
if (config["password"].isNull() && config["password_file"].isNull()) {
errors.push_back(Error(
"When '{{auth_type}}' is set to 'basic',"
" then either '{{password}}' or '{{password_file}}' must also be set"));
} else if (!config["password"].isNull() && !config["password_file"].isNull()) {
errors.push_back(Error(
"Only one of '{{password}}' or '{{password_file}}' may be set, but not both"));
}
}
}
static Json::Value normalizeAuthentication(const Json::Value &effectiveValues) {
Json::Value updates;
if (!effectiveValues["password_file"].isNull()) {
updates["password_file"] = absolutizePath(
effectiveValues["password_file"].asString());
}
return updates;
}
public:
Schema() {
initialize();
finalize();
}
Schema(bool _subclassing) {
initialize();
}
};
struct ConfigRealization {
string logPrefix;
bool dataDebug;
ConfigRealization(const ConfigKit::Store &config)
: logPrefix(config["log_prefix"].asString()),
dataDebug(config["data_debug"].asBool())
{ }
void swap(ConfigRealization &other) BOOST_NOEXCEPT_OR_NOTHROW {
logPrefix.swap(other.logPrefix);
std::swap(dataDebug, other.dataDebug);
}
};
struct ConfigChangeRequest {
boost::scoped_ptr<ConfigKit::Store> config;
boost::scoped_ptr<ConfigRealization> configRlz;
};
typedef websocketpp::client<websocketpp::config::asio_client> Endpoint;
typedef Endpoint::connection_ptr ConnectionPtr;
typedef Endpoint::message_ptr MessagePtr;
typedef websocketpp::connection_hdl ConnectionWeakPtr;
typedef boost::function<void ()> Callback;
typedef boost::function<void (const Json::Value &doc)> InspectCallback;
typedef boost::function<bool (WebSocketCommandReverseServer *server,
const ConnectionPtr &conn, const MessagePtr &msg)> MessageHandler;
enum State {
UNINITIALIZED,
NOT_CONNECTED,
CONNECTING,
WAITING_FOR_REQUEST,
REPLYING,
CLOSING,
SHUT_DOWN
};
private:
ConfigKit::Store config;
ConfigRealization configRlz;
Endpoint endpoint;
ConnectionPtr conn;
boost::shared_ptr<boost::asio::deadline_timer> timer;
MessageHandler messageHandler;
Callback shutdownCallback;
mutable boost::mutex stateSyncher;
State state;
deque<MessagePtr> buffer;
bool reconnectAfterReply;
bool shuttingDown;
unsigned int secondsToMilis(double seconds) {
return (unsigned int) (seconds * 1000.0);
}
/**
* It could happen that a certain method or handler is invoked
* for a connection that has already been closed. For example,
* after the message handler was invoked and before the message
* handler called doneReplying(), it could happen that the connection
* was reset. This method allows detecting those cases so that
* the code can decide not to do anything.
*/
bool isCurrentConnection(const ConnectionPtr &c) {
return conn && c.get() == conn.get();
}
bool isCurrentConnection(const ConnectionWeakPtr &wconn) {
return conn && endpoint.get_con_from_hdl(wconn).get() == conn.get();
}
static bool connectionIsConnected(const ConnectionPtr &c) {
websocketpp::session::state::value state = c->get_state();
return state == websocketpp::session::state::connecting
|| state == websocketpp::session::state::open;
}
bool isConnected(const ConnectionPtr &c) {
return isCurrentConnection(c) && connectionIsConnected(c);
}
bool isConnected(const ConnectionWeakPtr &wconn) {
if (OXT_UNLIKELY(!conn)) {
return false;
}
ConnectionPtr c = endpoint.get_con_from_hdl(wconn);
if (OXT_UNLIKELY(c.get() != conn.get())) {
return false;
}
return connectionIsConnected(c);
}
const string &getLogPrefix() const {
return configRlz.logPrefix;
}
void activateConfigUpdates(const ConfigKit::Store *oldConfig) {
if (config["websocketpp_debug_access"].asBool()) {
endpoint.set_access_channels(websocketpp::log::alevel::all);
} else {
endpoint.clear_access_channels(websocketpp::log::alevel::all);
}
if (config["websocketpp_debug_error"].asBool()) {
endpoint.set_error_channels(websocketpp::log::elevel::all);
} else {
endpoint.clear_error_channels(websocketpp::log::elevel::all);
}
if (oldConfig == NULL) {
return;
}
bool shouldReconnect =
oldConfig->get("url").asString() != config["url"].asString() ||
oldConfig->get("proxy_url").asString() != config["proxy_url"].asString() ||
oldConfig->get("data_debug").asBool() != config["data_debug"].asBool() ||
oldConfig->get("websocketpp_debug_access").asBool() != config["websocketpp_debug_access"].asBool() ||
oldConfig->get("websocketpp_debug_error").asBool() != config["websocketpp_debug_error"].asBool();
if (shouldReconnect) {
internalReconnect();
}
}
void internalInspectState(const InspectCallback callback) {
Json::Value doc(Json::objectValue);
doc["state"] = getStateString();
doc["buffer"]["message_count"] = (Json::UInt) buffer.size();
if (reconnectAfterReply) {
doc["reconnect_planned"] = true;
}
if (shuttingDown) {
doc["shutting_down"] = true;
}
callback(doc);
}
string getStateString() const {
boost::lock_guard<boost::mutex> l(stateSyncher);
switch (state) {
case UNINITIALIZED:
return "UNINITIALIZED";
case NOT_CONNECTED:
return "NOT_CONNECTED";
case CONNECTING:
return "CONNECTING";
case WAITING_FOR_REQUEST:
return "WAITING_FOR_REQUEST";
case REPLYING:
return "REPLYING";
case CLOSING:
return "CLOSING";
case SHUT_DOWN:
return "SHUT_DOWN";
default:
return "UNKNOWN";
};
}
void internalShutdown(const Callback callback) {
shuttingDown = true;
shutdownCallback = callback;
closeConnection(websocketpp::close::status::going_away,
"shutting down");
}
void startConnect() {
websocketpp::lib::error_code ec;
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = CONNECTING;
}
P_NOTICE(getLogPrefix() << "Connecting to " << config["url"].asString());
conn = endpoint.get_connection(config["url"].asString(), ec);
if (ec) {
P_ERROR(getLogPrefix() << "Error setting up a socket to "
<< config["url"].asString() << ": " << ec.message());
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = NOT_CONNECTED;
}
scheduleReconnect();
return;
}
if (!applyConnectionConfig(conn)) {
// applyConnectionConfig() already logs an error.
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = NOT_CONNECTED;
}
scheduleReconnect();
return;
}
if (config["auth_type"].asString() == "basic") {
try {
addBasicAuthHeader(conn);
} catch (const std::exception &e) {
P_ERROR(getLogPrefix() << "Error setting up basic authentication: "
<< e.what());
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = NOT_CONNECTED;
}
scheduleReconnect();
return;
}
}
conn->set_socket_init_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onSocketInit,
this,
websocketpp::lib::placeholders::_1,
websocketpp::lib::placeholders::_2));
conn->set_open_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onConnected,
this,
websocketpp::lib::placeholders::_1));
conn->set_fail_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onConnectFailed,
this,
websocketpp::lib::placeholders::_1));
conn->set_close_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onConnectionClosed,
this,
websocketpp::lib::placeholders::_1));
conn->set_pong_timeout_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onPongTimeout,
this,
websocketpp::lib::placeholders::_1,
websocketpp::lib::placeholders::_2));
conn->set_pong_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onPong,
this,
websocketpp::lib::placeholders::_1,
websocketpp::lib::placeholders::_2));
conn->set_message_handler(websocketpp::lib::bind(
&WebSocketCommandReverseServer::onMessage,
this,
websocketpp::lib::placeholders::_1,
websocketpp::lib::placeholders::_2));
endpoint.connect(conn);
}
void addBasicAuthHeader(ConnectionPtr &conn) {
string username = config["username"].asString();
string password;
if (config["password_file"].isNull()) {
password = config["password"].asString();
} else {
password = strip(unsafeReadFile(config["password_file"].asString()));
}
string data = modp::b64_encode(username + ":" + password);
conn->append_header("Authorization", "Basic " + data);
}
bool applyConnectionConfig(ConnectionPtr &conn) {
websocketpp::lib::error_code ec;
if (!config["proxy_url"].isNull()) {
conn->set_proxy(config["proxy_url"].asString(), ec);
if (ec) {
P_ERROR(getLogPrefix()
<< "Error setting proxy URL to "
<< config["proxy_url"].asString() << ": "
<< ec.message());
return false;
}
if (!config["proxy_username"].isNull() || !config["proxy_password"].isNull()) {
conn->set_proxy_basic_auth(config["proxy_username"].asString(),
config["proxy_password"].asString(), ec);
if (ec) {
P_ERROR(getLogPrefix()
<< "Error setting proxy authentication credentials to "
<< config["proxy_username"].asString() << ":<password omitted>:"
<< ec.message());
return false;
}
}
conn->set_proxy_timeout(secondsToMilis(config["proxy_timeout"].asDouble()), ec);
if (ec) {
P_ERROR(getLogPrefix()
<< "Error setting proxy timeout to "
<< config["proxy_timeout"].asDouble() << " seconds: "
<< ec.message());
return false;
}
}
conn->set_open_handshake_timeout(secondsToMilis(config["connect_timeout"].asDouble()));
conn->set_pong_timeout(secondsToMilis(config["ping_timeout"].asDouble()));
conn->set_close_handshake_timeout(secondsToMilis(config["close_timeout"].asDouble()));
return true;
}
void internalReconnect() {
switch (state) {
case NOT_CONNECTED:
// Do nothing.
break;
case CONNECTING:
case WAITING_FOR_REQUEST:
closeConnection(websocketpp::close::status::service_restart,
"reestablishing connection in order to apply configuration updates");
break;
case REPLYING:
reconnectAfterReply = true;
return;
default:
P_BUG("Unsupported state " + toString(state));
}
}
void scheduleReconnect() {
P_NOTICE(getLogPrefix() << "Reestablishing connection in " <<
config["reconnect_timeout"].asDouble() << " seconds");
restartTimer(secondsToMilis(config["reconnect_timeout"].asDouble()));
}
void closeConnection(websocketpp::close::status::value code,
const string &reason)
{
websocketpp::lib::error_code ec;
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = CLOSING;
}
P_NOTICE(getLogPrefix() << "Closing connection: " << reason);
reconnectAfterReply = false;
timer->cancel();
if (conn != NULL) {
conn->close(code, reason, ec);
conn.reset();
if (ec) {
P_WARN(getLogPrefix() << "Error closing connection: " << ec.message());
}
}
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = NOT_CONNECTED;
}
if (!shuttingDown) {
scheduleReconnect();
}
}
void restartTimer(unsigned int ms) {
timer->expires_from_now(boost::posix_time::milliseconds(ms));
timer->async_wait(boost::bind(
&WebSocketCommandReverseServer::onTimeout,
this,
boost::placeholders::_1));
}
void onSocketInit(ConnectionWeakPtr wconn, boost::asio::ip::tcp::socket &s) {
boost::asio::ip::tcp::no_delay option(true);
s.set_option(option);
}
void onConnected(ConnectionWeakPtr wconn) {
if (!isConnected(wconn)) {
P_DEBUG(getLogPrefix() << "onConnected: stale connection");
return;
}
P_NOTICE(getLogPrefix() << "Connection established");
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = WAITING_FOR_REQUEST;
}
buffer.clear();
P_DEBUG(getLogPrefix() << "Scheduling next ping in " <<
config["ping_interval"].asDouble() << " seconds");
restartTimer(secondsToMilis(config["ping_interval"].asDouble()));
}
void onConnectFailed(ConnectionWeakPtr wconn) {
if (!isCurrentConnection(wconn)) {
P_DEBUG(getLogPrefix() << "onConnectFailed: not current connection");
return;
}
if (LoggingKit::getLevel() >= LoggingKit::ERROR) {
string message;
if (strcmp(conn->get_ec().category().name(), "websocketpp.processor") == 0
&& conn->get_ec().value() == websocketpp::processor::error::invalid_http_status)
{
if (conn->get_response_code() == websocketpp::http::status_code::unauthorized) {
message = "server authentication error";
} else {
message = conn->get_ec().message();
}
} else {
message = conn->get_ec().message();
}
P_ERROR(getLogPrefix() << "Unable to establish connection: " << message);
}
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = NOT_CONNECTED;
}
scheduleReconnect();
}
void onConnectionClosed(ConnectionWeakPtr wconn) {
if (!isCurrentConnection(wconn)) {
P_DEBUG(getLogPrefix() << "onConnectionClosed: not current connection");
return;
}
P_NOTICE(getLogPrefix() << "Connection closed (server close reason: " <<
conn->get_remote_close_code() << ": " <<
conn->get_remote_close_reason() << ")");
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = NOT_CONNECTED;
}
reconnectAfterReply = false;
if (shuttingDown) {
timer->cancel();
} else {
scheduleReconnect();
}
}
void onTimeout(const boost::system::error_code &e) {
if (e.value() == boost::system::errc::operation_canceled) {
P_DEBUG(getLogPrefix() << "onTimeout: operation cancelled");
return;
}
if (e) {
P_ERROR(getLogPrefix() << "Error in timer: " << e.message());
return;
}
websocketpp::lib::error_code ec;
switch (state) {
case NOT_CONNECTED:
startConnect();
break;
case WAITING_FOR_REQUEST:
case REPLYING:
P_DEBUG(getLogPrefix() << "Sending ping");
conn->ping("ping", ec);
if (ec) {
closeConnection(websocketpp::close::status::normal,
"error sending ping");
}
// After sending the ping, we wait until either
// onPong() or onPongTimeout() is called before
// scheduling the next ping.
break;
default:
P_BUG("Unsupported state " + toString(state));
break;
}
}
void onPongTimeout(ConnectionWeakPtr wconn, const string &payload) {
if (!isCurrentConnection(wconn)) {
P_DEBUG(getLogPrefix() << "onPongTimeout: not current connection");
return;
}
switch (state) {
case REPLYING:
// Ignore pong timeouts while replying because
// reading is paused while replying.
P_DEBUG(getLogPrefix() << "onPongTimeout: ignoring REPLYING state");
break;
default:
P_DEBUG(getLogPrefix() << "onPongTimeout: closing connection");
closeConnection(websocketpp::close::status::normal,
"reconnecting because of pong timeout");
break;
}
}
void onPong(ConnectionWeakPtr wconn, const string &payload) {
if (!isConnected(wconn)) {
P_DEBUG(getLogPrefix() << "onPong: stale connection");
return;
}
P_DEBUG(getLogPrefix() << "Pong received. Scheduling next ping in " <<
config["ping_interval"].asDouble() << " seconds");
restartTimer(secondsToMilis(config["ping_interval"].asDouble()));
}
void onMessage(ConnectionWeakPtr wconn, MessagePtr msg) {
if (!isConnected(wconn)) {
P_DEBUG(getLogPrefix() << "onMessage: stale connection");
return;
}
switch (state) {
case WAITING_FOR_REQUEST:
P_DEBUG(getLogPrefix() << "onMessage: got frame of " <<
msg->get_payload().size() << " bytes");
WCRS_DEBUG_FRAME(this, "Received message's frame data:", msg->get_payload());
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = REPLYING;
}
if (messageHandler(this, conn, msg)) {
doneReplying(conn);
} else {
// We do not pause the connection here because of what appears
// to be an ASIO bug.
// See class header comments, "About flow control and backpressure".
//conn->pause_reading();
}
break;
case CLOSING:
// Ignore any incoming messages while closing.
P_DEBUG(getLogPrefix() << "onMessage: ignoring CLOSING state");
break;
case REPLYING:
// Even if we call conn->pause_reading(), WebSocket++
// may already have received further messages in its buffer,
// which it will still pass to us. Don't process these
// and just buffer them.
P_DEBUG(getLogPrefix() << "onMessage: got frame of " <<
msg->get_payload().size() << " bytes (pushed to buffer -> "
<< (buffer.size() + 1) << " entries)");
WCRS_DEBUG_FRAME(this, "Received message's frame data:", msg->get_payload());
buffer.push_back(msg);
break;
default:
P_BUG("Unsupported state " + toString(state));
}
}
public:
WebSocketCommandReverseServer(const Schema &schema, const MessageHandler &_messageHandler,
const Json::Value &initialConfig,
const ConfigKit::Translator &translator = ConfigKit::DummyTranslator())
: config(schema, initialConfig, translator),
configRlz(config),
messageHandler(_messageHandler),
state(UNINITIALIZED),
reconnectAfterReply(false),
shuttingDown(false)
{
activateConfigUpdates(NULL);
}
void initialize() {
endpoint.init_asio();
state = NOT_CONNECTED;
timer = boost::make_shared<boost::asio::deadline_timer, boost::asio::io_service &>(
endpoint.get_io_service());
startConnect();
}
/**
* Enter the server's event loop. This method blocks until
* the server is shut down.
*
* May only be called once, and only after `initialize()` is called.
*/
void run() {
endpoint.run();
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = SHUT_DOWN;
}
if (shutdownCallback) {
shutdownCallback();
}
}
const ConfigKit::Store &getConfig() const {
return config;
}
boost::asio::io_service &getIoService() {
return endpoint.get_io_service();
}
bool prepareConfigChange(const Json::Value &updates,
vector<ConfigKit::Error> &errors, ConfigChangeRequest &req)
{
req.config.reset(new ConfigKit::Store(config, updates, errors));
if (errors.empty()) {
req.configRlz.reset(new ConfigRealization(*req.config));
}
return errors.empty();
}
void commitConfigChange(ConfigChangeRequest &req) BOOST_NOEXCEPT_OR_NOTHROW {
config.swap(*req.config);
configRlz.swap(*req.configRlz);
activateConfigUpdates(req.config.get());
}
Json::Value inspectConfig() const {
return config.inspect();
}
void asyncPrepareConfigChange(const Json::Value &updates,
ConfigChangeRequest &req,
const ConfigKit::CallbackTypes<WebSocketCommandReverseServer>::PrepareConfigChange &callback)
{
endpoint.get_io_service().post(boost::bind(
ConfigKit::callPrepareConfigChangeAndCallback<WebSocketCommandReverseServer>,
this, updates, &req, callback));
}
void asyncCommitConfigChange(ConfigChangeRequest &req,
const ConfigKit::CallbackTypes<WebSocketCommandReverseServer>::CommitConfigChange &callback)
BOOST_NOEXCEPT_OR_NOTHROW
{
endpoint.get_io_service().post(boost::bind(
ConfigKit::callCommitConfigChangeAndCallback<WebSocketCommandReverseServer>,
this, &req, callback));
}
void asyncInspectConfig(const ConfigKit::CallbackTypes<WebSocketCommandReverseServer>::InspectConfig &callback) {
endpoint.get_io_service().post(boost::bind(
ConfigKit::callInspectConfigAndCallback<WebSocketCommandReverseServer>,
this, callback));
}
void asyncInspectState(const InspectCallback &callback) {
endpoint.get_io_service().post(boost::bind(
&WebSocketCommandReverseServer::internalInspectState,
this, callback));
}
/**
* Prepares this server for shut down. It will finish any replies that
* are in-flight and will close the connection. When finished, it will
* call the given callback (if any) from the thread that invoked
* `run()`.
*
* May only be called when the event loop is running.
* This method is thread-safe and may be called from any thread.
*/
void asyncShutdown(const Callback &callback = Callback()) {
endpoint.get_io_service().post(boost::bind(
&WebSocketCommandReverseServer::internalShutdown,
this, callback));
}
/**
* When the message handler is done sending a reply, it must
* call this method to tell the server that the reply is done.
*
* May only be called when the server is in the REPLYING state.
* May only be called from the event loop's thread.
*/
void doneReplying(const ConnectionPtr &conn) {
begin:
if (!isConnected(conn)) {
P_DEBUG(getLogPrefix() << "doneReplying: stale connection");
return;
}
P_DEBUG(getLogPrefix() << "Done replying");
P_ASSERT_EQ(state, REPLYING);
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = WAITING_FOR_REQUEST;
}
if (reconnectAfterReply) {
reconnectAfterReply = false;
internalReconnect();
return;
}
if (buffer.empty()) {
// We do not resume the connection here because of what appears
// to be an ASIO bug.
// See class header comments, "About flow control and backpressure".
//conn->resume_reading();
} else {
MessagePtr msg = buffer.front();
P_DEBUG(getLogPrefix() << "Process next message in buffer ("
<< buffer.size() << " entries): " <<
msg->get_payload().size() << " bytes");
WCRS_DEBUG_FRAME(this, "Buffered message's frame data:", msg->get_payload());
buffer.pop_front();
{
boost::lock_guard<boost::mutex> l(stateSyncher);
state = REPLYING;
}
if (messageHandler(this, conn, msg)) {
goto begin;
}
}
}
const string &_getLogPrefix() const {
return getLogPrefix();
}
LoggingKit::Level _getDataDebugLevel() const {
if (OXT_UNLIKELY(configRlz.dataDebug)) {
return LoggingKit::NOTICE;
} else {
return LoggingKit::DEBUG2;
}
}
};
} // namespace Passenger
#endif /* _PASSENGER_WEB_SOCKET_COMMAND_REVERSE_SERVER_H_ */