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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 "components/domain_reliability/context.h"
#include <algorithm>
#include "base/bind.h"
#include "base/json/json_writer.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/metrics/sparse_histogram.h"
#include "base/values.h"
#include "components/domain_reliability/beacon.h"
#include "components/domain_reliability/dispatcher.h"
#include "net/base/net_errors.h"
#include "net/url_request/url_request_context_getter.h"
using base::DictionaryValue;
using base::ListValue;
using base::Value;
namespace domain_reliability {
namespace {
typedef std::deque<DomainReliabilityBeacon> BeaconDeque;
typedef BeaconDeque::iterator BeaconIterator;
typedef BeaconDeque::const_iterator BeaconConstIterator;
} // namespace
class DomainReliabilityContext::ResourceState {
public:
ResourceState(DomainReliabilityContext* context,
const DomainReliabilityConfig::Resource* config)
: context(context),
config(config),
successful_requests(0),
failed_requests(0) {}
~ResourceState() {}
scoped_ptr<base::Value> ToValue(base::TimeTicks upload_time) const {
ListValue* beacons_value = new ListValue();
for (BeaconConstIterator it = beacons.begin(); it != beacons.end(); ++it)
beacons_value->Append(it->ToValue(upload_time));
DictionaryValue* resource_value = new DictionaryValue();
resource_value->SetString("resource_name", config->name);
resource_value->SetInteger("successful_requests", successful_requests);
resource_value->SetInteger("failed_requests", failed_requests);
resource_value->Set("beacons", beacons_value);
return scoped_ptr<Value>(resource_value);
}
// Remembers the current state of the resource data when an upload starts.
void MarkUpload() {
uploading_beacons_size = beacons.size();
uploading_successful_requests = successful_requests;
uploading_failed_requests = failed_requests;
}
// Uses the state remembered by |MarkUpload| to remove successfully uploaded
// data but keep beacons and request counts added after the upload started.
void CommitUpload() {
BeaconIterator begin = beacons.begin();
BeaconIterator end = begin + uploading_beacons_size;
beacons.erase(begin, end);
successful_requests -= uploading_successful_requests;
failed_requests -= uploading_failed_requests;
}
// Gets the start time of the oldest beacon, if there are any. Returns true
// and sets |oldest_start_out| if so; otherwise, returns false.
bool GetOldestBeaconStart(base::TimeTicks* oldest_start_out) const {
if (beacons.empty())
return false;
*oldest_start_out = beacons[0].start_time;
return true;
}
// Removes the oldest beacon. DCHECKs if there isn't one.
void RemoveOldestBeacon() {
DCHECK(!beacons.empty());
beacons.erase(beacons.begin());
// If that just removed a beacon counted in uploading_beacons_size,
// decrement
// that.
if (uploading_beacons_size > 0)
--uploading_beacons_size;
}
DomainReliabilityContext* context;
const DomainReliabilityConfig::Resource* config;
std::deque<DomainReliabilityBeacon> beacons;
uint32 successful_requests;
uint32 failed_requests;
// State saved during uploads; if an upload succeeds, these are used to
// remove uploaded data from the beacon list and request counters.
size_t uploading_beacons_size;
uint32 uploading_successful_requests;
uint32 uploading_failed_requests;
private:
DISALLOW_COPY_AND_ASSIGN(ResourceState);
};
// static
const size_t DomainReliabilityContext::kMaxQueuedBeacons = 150;
DomainReliabilityContext::DomainReliabilityContext(
MockableTime* time,
const DomainReliabilityScheduler::Params& scheduler_params,
const std::string& upload_reporter_string,
DomainReliabilityDispatcher* dispatcher,
DomainReliabilityUploader* uploader,
scoped_ptr<const DomainReliabilityConfig> config)
: config_(config.Pass()),
time_(time),
upload_reporter_string_(upload_reporter_string),
scheduler_(time,
config_->collectors.size(),
scheduler_params,
base::Bind(&DomainReliabilityContext::ScheduleUpload,
base::Unretained(this))),
dispatcher_(dispatcher),
uploader_(uploader),
beacon_count_(0),
weak_factory_(this) {
InitializeResourceStates();
}
DomainReliabilityContext::~DomainReliabilityContext() {}
void DomainReliabilityContext::OnBeacon(const GURL& url,
const DomainReliabilityBeacon& beacon) {
size_t index = config_->GetResourceIndexForUrl(url);
if (index == DomainReliabilityConfig::kInvalidResourceIndex)
return;
DCHECK_GT(states_.size(), index);
bool success = (beacon.status == "ok");
ResourceState* state = states_[index];
if (success)
++state->successful_requests;
else
++state->failed_requests;
bool reported = false;
bool evicted = false;
if (state->config->DecideIfShouldReportRequest(success)) {
state->beacons.push_back(beacon);
++beacon_count_;
if (beacon_count_ > kMaxQueuedBeacons) {
RemoveOldestBeacon();
evicted = true;
}
scheduler_.OnBeaconAdded();
reported = true;
UMA_HISTOGRAM_SPARSE_SLOWLY("DomainReliability.ReportedBeaconError",
-beacon.chrome_error);
// TODO(ttuttle): Histogram HTTP response code?
}
UMA_HISTOGRAM_BOOLEAN("DomainReliability.BeaconReported", reported);
UMA_HISTOGRAM_BOOLEAN("DomainReliability.OnBeaconDidEvict", evicted);
}
void DomainReliabilityContext::GetQueuedDataForTesting(
size_t resource_index,
std::vector<DomainReliabilityBeacon>* beacons_out,
uint32* successful_requests_out,
uint32* failed_requests_out) const {
DCHECK_NE(DomainReliabilityConfig::kInvalidResourceIndex, resource_index);
DCHECK_GT(states_.size(), resource_index);
const ResourceState& state = *states_[resource_index];
if (beacons_out)
beacons_out->assign(state.beacons.begin(), state.beacons.end());
if (successful_requests_out)
*successful_requests_out = state.successful_requests;
if (failed_requests_out)
*failed_requests_out = state.failed_requests;
}
void DomainReliabilityContext::InitializeResourceStates() {
ScopedVector<DomainReliabilityConfig::Resource>::const_iterator it;
for (it = config_->resources.begin(); it != config_->resources.end(); ++it)
states_.push_back(new ResourceState(this, *it));
}
void DomainReliabilityContext::ScheduleUpload(
base::TimeDelta min_delay,
base::TimeDelta max_delay) {
dispatcher_->ScheduleTask(
base::Bind(
&DomainReliabilityContext::StartUpload,
weak_factory_.GetWeakPtr()),
min_delay,
max_delay);
}
void DomainReliabilityContext::StartUpload() {
MarkUpload();
DCHECK(upload_time_.is_null());
upload_time_ = time_->NowTicks();
std::string report_json;
scoped_ptr<const Value> report_value(CreateReport(upload_time_));
base::JSONWriter::Write(report_value.get(), &report_json);
report_value.reset();
size_t collector_index = scheduler_.OnUploadStart();
uploader_->UploadReport(
report_json,
config_->collectors[collector_index]->upload_url,
base::Bind(
&DomainReliabilityContext::OnUploadComplete,
weak_factory_.GetWeakPtr()));
UMA_HISTOGRAM_BOOLEAN("DomainReliability.UploadFailover",
collector_index > 0);
if (!last_upload_time_.is_null()) {
UMA_HISTOGRAM_LONG_TIMES("DomainReliability.UploadInterval",
upload_time_ - last_upload_time_);
}
}
void DomainReliabilityContext::OnUploadComplete(bool success) {
if (success)
CommitUpload();
scheduler_.OnUploadComplete(success);
UMA_HISTOGRAM_BOOLEAN("DomainReliability.UploadSuccess", success);
DCHECK(!upload_time_.is_null());
UMA_HISTOGRAM_MEDIUM_TIMES("DomainReliability.UploadDuration",
time_->NowTicks() - upload_time_);
last_upload_time_ = upload_time_;
upload_time_ = base::TimeTicks();
}
scoped_ptr<const Value> DomainReliabilityContext::CreateReport(
base::TimeTicks upload_time) const {
ListValue* resources_value = new ListValue();
for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it)
resources_value->Append((*it)->ToValue(upload_time).release());
DictionaryValue* report_value = new DictionaryValue();
report_value->SetString("reporter", upload_reporter_string_);
report_value->Set("resource_reports", resources_value);
return scoped_ptr<const Value>(report_value);
}
void DomainReliabilityContext::MarkUpload() {
for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it)
(*it)->MarkUpload();
uploading_beacon_count_ = beacon_count_;
}
void DomainReliabilityContext::CommitUpload() {
for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it)
(*it)->CommitUpload();
beacon_count_ -= uploading_beacon_count_;
}
void DomainReliabilityContext::RemoveOldestBeacon() {
DCHECK_LT(0u, beacon_count_);
base::TimeTicks min_time;
ResourceState* min_resource = NULL;
for (ResourceStateIterator it = states_.begin(); it != states_.end(); ++it) {
base::TimeTicks oldest;
if ((*it)->GetOldestBeaconStart(&oldest)) {
if (!min_resource || oldest < min_time) {
min_time = oldest;
min_resource = *it;
}
}
}
DCHECK(min_resource);
VLOG(1) << "Beacon queue for " << config().domain << " full; "
<< "removing oldest beacon from " << min_resource->config->name;
min_resource->RemoveOldestBeacon();
--beacon_count_;
// If that just removed a beacon counted in uploading_beacon_count_, decrement
// that.
if (uploading_beacon_count_ > 0)
--uploading_beacon_count_;
}
} // namespace domain_reliability