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/* Copyright 2016-present Facebook, Inc.
* Licensed under the Apache License, Version 2.0 */
#include "WatchmanClient.h"
#include <folly/Format.h>
#include <glog/logging.h>
namespace watchman {
using namespace folly;
WatchmanClient::WatchmanClient(
EventBase* eventBase,
Optional<std::string>&& socketPath,
folly::Executor* cpuExecutor,
ErrorCallback errorCallback)
: conn_(std::make_shared<WatchmanConnection>(
eventBase,
std::move(socketPath),
Optional<WatchmanConnection::Callback>(
[this](Try<dynamic>&& data) {
connectionCallback(std::move(data));
}),
cpuExecutor)),
errorCallback_(errorCallback) {}
void WatchmanClient::connectionCallback(Try<dynamic>&& try_data) {
// If an exception occurs notify all subscription callbacks. Other outstanding
// one-shots etc. will get exceptions returned via their futures if needed.
if (try_data.hasException()) {
for (auto& subscription : subscriptionMap_) {
subscription.second->executor_->add(
[ sub_ptr = subscription.second, try_data]() mutable {
if (sub_ptr->active_) {
sub_ptr->callback_(std::move(try_data));
}
});
}
if (errorCallback_) {
errorCallback_(try_data.exception());
}
return;
}
auto& data = try_data.value();
auto subscription_data = data.get_ptr("subscription");
if (subscription_data) {
std::lock_guard<std::mutex> guard(mutex_);
auto subscription = subscriptionMap_.find(subscription_data->asString());
if (subscription == subscriptionMap_.end()) {
LOG(ERROR) << "Unexpected subscription update: "
<< subscription_data->asString();
} else {
subscription->second->executor_->add(
[ sub_ptr = subscription->second, data = std::move(data) ]() mutable {
if (sub_ptr->active_) {
sub_ptr->callback_(Try<dynamic>(std::move(data)));
}
});
}
} else {
LOG(ERROR) << "Unhandled unilateral data: " << data;
}
}
Future<dynamic> WatchmanClient::connect(dynamic versionArgs) {
return conn_->connect(versionArgs);
}
void WatchmanClient::close() {
return conn_->close();
}
Future<dynamic> WatchmanClient::run(const dynamic& cmd) {
return conn_->run(cmd);
}
Future<WatchPathPtr> WatchmanClient::watch(StringPiece path) {
return conn_->run(dynamic::array("watch-project", path))
.then([=](dynamic& data) {
auto relativePath = data["relativePath"];
Optional<std::string> relativePath_optional;
if (relativePath != nullptr) {
relativePath_optional.assign(relativePath.asString());
}
return std::make_shared<WatchPath>(
data["watch"].asString(), relativePath_optional);
});
}
Future<SubscriptionPtr> WatchmanClient::subscribe(
dynamic query,
WatchPathPtr path,
Executor* executor,
SubscriptionCallback&& callback) {
auto name = folly::to<std::string>("sub", (int)++nextSubID_);
auto subscription =
std::make_shared<Subscription>(executor, std::move(callback), name, path);
{
std::lock_guard<std::mutex> guard(mutex_);
subscriptionMap_[name] = subscription;
}
if (path->relativePath_) {
query["relative_root"] = *(path->relativePath_);
}
return run(dynamic::array("subscribe", path->root_, name, query))
.then([subscription = std::move(subscription), name = name]
(dynamic data) {
CHECK(data["subscribe"] == name)
<< "Unexpected response to subscribe request " << data;
return subscription;
});
}
Future<SubscriptionPtr> WatchmanClient::subscribe(
const dynamic& query,
StringPiece path,
Executor* executor,
SubscriptionCallback&& callback) {
return watch(path).then(
[ =, callback = std::move(callback) ](WatchPathPtr watch_path) mutable {
return subscribe(query, watch_path, executor, std::move(callback));
});
}
Future<dynamic> WatchmanClient::unsubscribe(SubscriptionPtr sub) {
CHECK(sub->active_) << "Already unsubscribed.";
sub->active_ = false;
return run(dynamic::array("unsubscribe", sub->watchPath_->root_, sub->name_))
.ensure([=] {
std::lock_guard<std::mutex> guard(mutex_);
subscriptionMap_.erase(sub->name_);
});
}
Subscription::Subscription(
Executor* executor,
SubscriptionCallback&& callback,
const std::string& name,
WatchPathPtr watchPath)
: executor_(executor),
callback_(std::move(callback)),
name_(name),
watchPath_(watchPath) {}
WatchPath::WatchPath(
const std::string& root,
const Optional<std::string>& relativePath)
: root_(root), relativePath_(relativePath) {}
} // namespace watchman
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