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// Copyright 2014 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 <set>
#include "base/logging.h"
#include "base/time/time.h"
#include "components/copresence/copresence_state_impl.h"
#include "components/copresence/proto/data.pb.h"
#include "components/copresence/public/copresence_constants.h"
#include "components/copresence/public/copresence_observer.h"
namespace copresence {
namespace {
template<typename TokenType>
void HandleCommonFields(const TokenType& new_token, TokenType* current_token) {
if (current_token->id.empty()) {
current_token->id = new_token.id;
current_token->medium = new_token.medium;
current_token->start_time = new_token.start_time;
} else {
DCHECK_EQ(new_token.id, current_token->id);
DCHECK_EQ(new_token.medium, current_token->medium);
DCHECK(new_token.start_time.is_null() ||
new_token.start_time == current_token->start_time);
}
}
void UpdateToken(const TransmittedToken& new_token,
TransmittedToken* current_token) {
HandleCommonFields(new_token, current_token);
current_token->stop_time = new_token.stop_time;
current_token->broadcast_confirmed = new_token.broadcast_confirmed;
}
void UpdateToken(const ReceivedToken& new_token,
ReceivedToken* current_token) {
HandleCommonFields(new_token, current_token);
current_token->last_time = new_token.last_time;
if (new_token.valid != ReceivedToken::UNKNOWN)
current_token->valid = new_token.valid;
}
} // namespace
// Public functions.
CopresenceStateImpl::CopresenceStateImpl() {}
CopresenceStateImpl::~CopresenceStateImpl() {}
void CopresenceStateImpl::AddObserver(CopresenceObserver* observer) {
DCHECK(observer);
observers_.AddObserver(observer);
}
void CopresenceStateImpl::RemoveObserver(CopresenceObserver* observer) {
DCHECK(observer);
observers_.RemoveObserver(observer);
}
const std::vector<Directive>& CopresenceStateImpl::active_directives() const {
return active_directives_;
}
const std::map<std::string, TransmittedToken>&
CopresenceStateImpl::transmitted_tokens() const {
return transmitted_tokens_;
}
const std::map<std::string, ReceivedToken>&
CopresenceStateImpl::received_tokens() const {
return received_tokens_;
}
// TODO(ckehoe): Only send updates if the directives have really changed.
void CopresenceStateImpl::UpdateDirectives(
const std::vector<Directive>& directives) {
active_directives_ = directives;
UpdateTransmittingTokens();
FOR_EACH_OBSERVER(CopresenceObserver, observers_, DirectivesUpdated());
}
void CopresenceStateImpl::UpdateTransmittedToken(
const TransmittedToken& token) {
UpdateToken(token, &transmitted_tokens_[token.id]);
FOR_EACH_OBSERVER(CopresenceObserver,
observers_,
TokenTransmitted(transmitted_tokens_[token.id]));
}
// TODO(ckehoe): Check which tokens are no longer heard and report them lost.
void CopresenceStateImpl::UpdateReceivedToken(const ReceivedToken& token) {
DCHECK(!token.id.empty());
// TODO(ckehoe): Have CopresenceManagerImpl::AudioCheck() use this to check
// if we can hear our token, and delete the logic from the AudioManager.
if (transmitted_tokens_.count(token.id) > 0) {
transmitted_tokens_[token.id].broadcast_confirmed = true;
FOR_EACH_OBSERVER(CopresenceObserver,
observers_,
TokenTransmitted(transmitted_tokens_[token.id]));
} else {
ReceivedToken& stored_token = received_tokens_[token.id];
UpdateToken(token, &stored_token);
// The decoder doesn't track when this token was heard before,
// so it should just fill in the last_time.
// If we've never seen this token, we populate the start time too.
if (stored_token.start_time.is_null())
stored_token.start_time = token.last_time;
FOR_EACH_OBSERVER(CopresenceObserver,
observers_,
TokenReceived(stored_token));
}
}
void CopresenceStateImpl::UpdateTokenStatus(const std::string& token_id,
TokenStatus status) {
if (transmitted_tokens_.count(token_id) > 0) {
LOG_IF(ERROR, status != VALID)
<< "Broadcast token " << token_id << " is invalid";
} else if (received_tokens_.count(token_id) > 0) {
received_tokens_[token_id].valid = status == VALID ?
ReceivedToken::VALID : ReceivedToken::INVALID;
FOR_EACH_OBSERVER(CopresenceObserver,
observers_,
TokenReceived(received_tokens_[token_id]));
} else {
LOG(ERROR) << "Got status update for unrecognized token " << token_id;
}
}
// Private functions.
void CopresenceStateImpl::UpdateTransmittingTokens() {
std::set<std::string> tokens_to_update;
for (const auto& token_entry : transmitted_tokens_)
tokens_to_update.insert(token_entry.first);
for (const Directive& directive : active_directives_) {
const TokenInstruction& instruction = directive.token_instruction();
if (instruction.token_instruction_type() == TRANSMIT) {
tokens_to_update.erase(instruction.token_id());
TransmittedToken& token = transmitted_tokens_[instruction.token_id()];
token.id = instruction.token_id();
token.medium = instruction.medium();
token.start_time = base::Time::Now();
token.stop_time = base::Time::Now() +
base::TimeDelta::FromMilliseconds(directive.ttl_millis());
FOR_EACH_OBSERVER(CopresenceObserver,
observers_,
TokenTransmitted(token));
}
}
// Tokens not updated above are no longer transmitting.
base::Time now = base::Time::Now();
for (const std::string& token : tokens_to_update) {
if (transmitted_tokens_[token].stop_time > now)
transmitted_tokens_[token].stop_time = now;
FOR_EACH_OBSERVER(CopresenceObserver,
observers_,
TokenTransmitted(transmitted_tokens_[token]));
}
}
} // namespace copresence
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