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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/gcd_state_updater.h"
#include <stdint.h>
#include <utility>
#include "base/callback_helpers.h"
#include "base/strings/stringize_macros.h"
#include "base/time/time.h"
#include "base/values.h"
#include "remoting/base/constants.h"
#include "remoting/base/logging.h"
namespace remoting {
namespace {
const int64_t kTimerIntervalMinMs = 1000;
const int64_t kTimerIntervalMaxMs = 5 * 60 * 1000; // 5 minutes
} // namespace
GcdStateUpdater::GcdStateUpdater(
const base::Closure& on_update_successful_callback,
const base::Closure& on_unknown_host_id_error,
SignalStrategy* signal_strategy,
std::unique_ptr<GcdRestClient> gcd_rest_client)
: on_update_successful_callback_(on_update_successful_callback),
on_unknown_host_id_error_(on_unknown_host_id_error),
signal_strategy_(signal_strategy),
gcd_rest_client_(std::move(gcd_rest_client)) {
DCHECK(signal_strategy_);
DCHECK(thread_checker_.CalledOnValidThread());
signal_strategy_->AddListener(this);
// Update state if the |signal_strategy_| is already connected.
OnSignalStrategyStateChange(signal_strategy_->GetState());
}
GcdStateUpdater::~GcdStateUpdater() {
signal_strategy_->RemoveListener(this);
}
void GcdStateUpdater::SetHostOfflineReason(
const std::string& host_offline_reason,
const base::TimeDelta& timeout,
const base::Callback<void(bool success)>& ack_callback) {
// TODO(jrw): Implement this. Refer to
// HeartbeatSender::SetHostOfflineReason.
NOTIMPLEMENTED();
}
void GcdStateUpdater::OnSignalStrategyStateChange(SignalStrategy::State state) {
if (state == SignalStrategy::CONNECTED) {
timer_.Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(kTimerIntervalMinMs),
base::TimeDelta::FromMilliseconds(kTimerIntervalMaxMs),
base::Bind(&GcdStateUpdater::MaybeSendStateUpdate,
base::Unretained(this)));
} else if (state == SignalStrategy::DISCONNECTED) {
timer_.Stop();
}
}
bool GcdStateUpdater::OnSignalStrategyIncomingStanza(
const buzz::XmlElement* stanza) {
// Ignore all XMPP stanzas.
return false;
}
void GcdStateUpdater::OnPatchStateResult(GcdRestClient::Result result) {
if (!timer_.IsRunning()) {
return;
}
if (result == GcdRestClient::NETWORK_ERROR ||
pending_request_jid_ != signal_strategy_->GetLocalJid()) {
// Continue exponential backoff.
return;
}
timer_.Stop();
if (result == GcdRestClient::SUCCESS) {
if (!on_update_successful_callback_.is_null()) {
on_unknown_host_id_error_.Reset();
base::ResetAndReturn(&on_update_successful_callback_).Run();
}
} else if (result == GcdRestClient::NO_SUCH_HOST) {
if (!on_unknown_host_id_error_.is_null()) {
on_update_successful_callback_.Reset();
base::ResetAndReturn(&on_unknown_host_id_error_).Run();
}
} else {
// For any other error, do nothing since there's no way to handle
// it and the error will already have been logged at this point.
}
}
void GcdStateUpdater::MaybeSendStateUpdate() {
DCHECK_EQ(signal_strategy_->GetState(), SignalStrategy::CONNECTED);
// Don't send a request if there is already another request pending.
// This avoids having multiple outstanding requests, which would be
// a problem since there's no guarantee that the reqests will
// complete in order.
if (gcd_rest_client_->HasPendingRequest()) {
return;
}
// Construct an update to the remote state.
std::unique_ptr<base::DictionaryValue> patch(new base::DictionaryValue);
std::unique_ptr<base::DictionaryValue> base_state(new base::DictionaryValue);
pending_request_jid_ = signal_strategy_->GetLocalJid();
base_state->SetString("_jabberId", pending_request_jid_);
base_state->SetString("_hostVersion", STRINGIZE(VERSION));
patch->Set("base", std::move(base_state));
// Send the update to GCD.
gcd_rest_client_->PatchState(
std::move(patch),
base::Bind(&GcdStateUpdater::OnPatchStateResult, base::Unretained(this)));
}
} // namespace remoting
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