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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <deque>
#include <memory>
#include <string>
#include "webrtc/libjingle/xmpp/xmppengine.h"
#include "webrtc/base/constructormagic.h"
#include "webrtc/base/sigslot.h"
#include "webrtc/base/task.h"
#include "webrtc/base/taskparent.h"
namespace buzz {
// See Task and XmppClient first.
// XmppTask is a task that is designed to go underneath XmppClient and be
// useful there. It has a way of finding its XmppClient parent so you
// can have it nested arbitrarily deep under an XmppClient and it can
// still find the XMPP services.
// Tasks register themselves to listen to particular kinds of stanzas
// that are sent out by the client. Rather than processing stanzas
// right away, they should decide if they own the sent stanza,
// and if so, queue it and Wake() the task, or if a stanza does not belong
// to you, return false right away so the next XmppTask can take a crack.
// This technique (synchronous recognize, but asynchronous processing)
// allows you to have arbitrary logic for recognizing stanzas yet still,
// for example, disconnect a client while processing a stanza -
// without reentrancy problems.
class XmppTask;
// XmppClientInterface is an abstract interface for sending and
// handling stanzas. It can be implemented for unit tests or
// different network environments. It will usually be implemented by
// XmppClient.
class XmppClientInterface {
virtual ~XmppClientInterface();
virtual XmppEngine::State GetState() const = 0;
virtual const Jid& jid() const = 0;
virtual std::string NextId() = 0;
virtual XmppReturnStatus SendStanza(const XmlElement* stanza) = 0;
virtual XmppReturnStatus SendStanzaError(const XmlElement* original_stanza,
XmppStanzaError error_code,
const std::string& message) = 0;
virtual void AddXmppTask(XmppTask* task, XmppEngine::HandlerLevel level) = 0;
virtual void RemoveXmppTask(XmppTask* task) = 0;
sigslot::signal0<> SignalDisconnected;
// XmppTaskParentInterface is the interface require for any parent of
// an XmppTask. It needs, for example, a way to get an
// XmppClientInterface.
// We really ought to inherit from a TaskParentInterface, but we tried
// that and it's way too complicated to change
// Task/TaskParent/TaskRunner. For now, this works.
class XmppTaskParentInterface : public rtc::Task {
explicit XmppTaskParentInterface(rtc::TaskParent* parent)
: Task(parent) {
virtual ~XmppTaskParentInterface() {}
virtual XmppClientInterface* GetClient() = 0;
class XmppTaskBase : public XmppTaskParentInterface {
explicit XmppTaskBase(XmppTaskParentInterface* parent)
: XmppTaskParentInterface(parent),
parent_(parent) {
virtual ~XmppTaskBase() {}
virtual XmppClientInterface* GetClient() {
return parent_->GetClient();
XmppTaskParentInterface* parent_;
class XmppTask : public XmppTaskBase,
public XmppStanzaHandler,
public sigslot::has_slots<>
XmppTask(XmppTaskParentInterface* parent,
XmppEngine::HandlerLevel level = XmppEngine::HL_NONE);
virtual ~XmppTask();
std::string task_id() const { return id_; }
void set_task_id(std::string id) { id_ = id; }
#if !defined(NDEBUG)
void set_debug_force_timeout(const bool f) { debug_force_timeout_ = f; }
virtual bool HandleStanza(const XmlElement* stanza) { return false; }
XmppReturnStatus SendStanza(const XmlElement* stanza);
XmppReturnStatus SetResult(const std::string& code);
XmppReturnStatus SendStanzaError(const XmlElement* element_original,
XmppStanzaError code,
const std::string& text);
virtual void Stop();
virtual void OnDisconnect();
virtual void QueueStanza(const XmlElement* stanza);
const XmlElement* NextStanza();
bool MatchStanzaFrom(const XmlElement* stanza, const Jid& match_jid);
bool MatchResponseIq(const XmlElement* stanza, const Jid& to,
const std::string& task_id);
static bool MatchRequestIq(const XmlElement* stanza, const std::string& type,
const QName& qn);
static XmlElement *MakeIqResult(const XmlElement* query);
static XmlElement *MakeIq(const std::string& type,
const Jid& to, const std::string& task_id);
// Returns true if the task is under the specified rate limit and updates the
// rate limit accordingly
bool VerifyTaskRateLimit(const std::string task_name, int max_count,
int per_x_seconds);
void StopImpl();
bool stopped_;
std::deque<XmlElement*> stanza_queue_;
std::unique_ptr<XmlElement> next_stanza_;
std::string id_;
#if !defined(NDEBUG)
bool debug_force_timeout_;
} // namespace buzz