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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/sync/engine/net/server_connection_manager.h"
#include <errno.h>
#include <ostream>
#include "base/check_is_test.h"
#include "base/metrics/histogram.h"
#include "base/observer_list.h"
#include "build/build_config.h"
#include "components/sync/engine/cancelation_signal.h"
#include "components/sync/engine/net/url_translator.h"
#include "components/sync/engine/syncer.h"
#include "net/http/http_status_code.h"
#include "url/gurl.h"
namespace syncer {
namespace {
#define ENUM_CASE(x) \
case HttpResponse::x: \
return #x; \
break
const char* GetServerConnectionCodeString(
HttpResponse::ServerConnectionCode code) {
switch (code) {
ENUM_CASE(NONE);
ENUM_CASE(CONNECTION_UNAVAILABLE);
ENUM_CASE(SYNC_SERVER_ERROR);
ENUM_CASE(SYNC_AUTH_ERROR);
ENUM_CASE(SERVER_CONNECTION_OK);
}
NOTREACHED();
}
#undef ENUM_CASE
} // namespace
HttpResponse::HttpResponse()
: server_status(NONE),
net_error_code(-1),
http_status_code(-1),
content_length(-1) {}
// static
HttpResponse HttpResponse::Uninitialized() {
return HttpResponse();
}
// static
HttpResponse HttpResponse::ForNetError(int net_error_code) {
HttpResponse response;
response.server_status = CONNECTION_UNAVAILABLE;
response.net_error_code = net_error_code;
return response;
}
// static
HttpResponse HttpResponse::ForUnspecifiedError() {
HttpResponse response;
response.server_status = CONNECTION_UNAVAILABLE;
return response;
}
// static
HttpResponse HttpResponse::ForHttpStatusCode(int http_status_code) {
HttpResponse response;
if (http_status_code == net::HTTP_OK) {
response.server_status = SERVER_CONNECTION_OK;
} else if (http_status_code == net::HTTP_UNAUTHORIZED) {
response.server_status = SYNC_AUTH_ERROR;
} else {
response.server_status = SYNC_SERVER_ERROR;
}
response.http_status_code = http_status_code;
return response;
}
// static
HttpResponse HttpResponse::ForSuccessForTest() {
CHECK_IS_TEST();
HttpResponse response;
response.server_status = SERVER_CONNECTION_OK;
response.http_status_code = net::HTTP_OK;
return response;
}
ServerConnectionManager::ServerConnectionManager()
: server_response_(HttpResponse::Uninitialized()) {}
ServerConnectionManager::~ServerConnectionManager() = default;
bool ServerConnectionManager::SetAccessToken(const std::string& access_token) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!access_token.empty()) {
access_token_.assign(access_token);
return true;
}
access_token_.clear();
// The access token could be non-empty in cases like server outage/bug. E.g.
// token returned by first request is considered invalid by sync server and
// because of token server's caching policy, etc, same token is returned on
// second request. Need to notify sync frontend again to request new token,
// otherwise backend will stay in SYNC_AUTH_ERROR state while frontend thinks
// everything is fine and takes no actions.
SetServerResponse(HttpResponse::ForHttpStatusCode(net::HTTP_UNAUTHORIZED));
return false;
}
void ServerConnectionManager::ClearAccessToken() {
access_token_.clear();
}
void ServerConnectionManager::SetServerResponse(
const HttpResponse& server_response) {
// Notify only if the server status changed, except for SYNC_AUTH_ERROR: In
// that case, always notify in order to poke observers to do something about
// it.
bool notify =
(server_response.server_status == HttpResponse::SYNC_AUTH_ERROR ||
server_response_.server_status != server_response.server_status);
server_response_ = server_response;
if (notify) {
NotifyStatusChanged();
}
}
void ServerConnectionManager::NotifyStatusChanged() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
for (ServerConnectionEventListener& observer : listeners_) {
observer.OnServerConnectionEvent(
ServerConnectionEvent(server_response_.server_status));
}
}
HttpResponse ServerConnectionManager::PostBufferWithCachedAuth(
const std::string& buffer_in,
std::string* buffer_out) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
HttpResponse http_response = PostBuffer(buffer_in, access_token_, buffer_out);
SetServerResponse(http_response);
return http_response;
}
void ServerConnectionManager::AddListener(
ServerConnectionEventListener* listener) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
listeners_.AddObserver(listener);
}
void ServerConnectionManager::RemoveListener(
ServerConnectionEventListener* listener) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
listeners_.RemoveObserver(listener);
}
std::ostream& operator<<(std::ostream& s, const struct HttpResponse& hr) {
s << " Response Code (bogus on error): " << hr.http_status_code;
s << " Content-Length (bogus on error): " << hr.content_length;
s << " Server Status: " << GetServerConnectionCodeString(hr.server_status);
return s;
}
} // namespace syncer
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