mirror of
https://github.com/nestriness/cdc-file-transfer.git
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104 lines
3.9 KiB
C++
104 lines
3.9 KiB
C++
/*
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* Copyright 2022 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CDC_STREAM_SESSION_MANAGER_H_
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#define CDC_STREAM_SESSION_MANAGER_H_
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#include <memory>
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#include <unordered_map>
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#include "absl/status/status.h"
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#include "absl/status/statusor.h"
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#include "absl/synchronization/mutex.h"
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#include "cdc_stream/session_config.h"
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#include "metrics/metrics.h"
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namespace cdc_ft {
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class MultiSession;
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class ProcessFactory;
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struct SessionTarget;
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// Adds logic around MultiSession to start and stop streaming sessions. Makes
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// sure that some invariants are maintained, like no two streaming sessions
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// exist to the same target user@host:dir.
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class SessionManager {
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public:
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SessionManager(SessionConfig cfg, ProcessFactory* process_factory,
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metrics::MetricsService* metrics_service);
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~SessionManager();
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// Starts a new session or reuses an existing one.
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// |instance_id| is a unique id for the remote instance and mount directory,
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// e.g. user@host:mount_dir.
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// |src_dir| is the local directory to stream.
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// |target| identifies the remote target and how to connect to it.
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// |project_id| is the project that owns the instance. Stadia only.
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// |organization_id| is organization that contains the instance. Stadia only.
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// Populates |multi_session| and |metrics_status| on success.
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absl::Status StartSession(const std::string& instance_id,
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const std::string& src_dir,
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const SessionTarget& target,
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const std::string& project_id,
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const std::string& organization_id,
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MultiSession** multi_session,
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metrics::SessionStartStatus* metrics_status)
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ABSL_LOCKS_EXCLUDED(sessions_mutex_);
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// Stops the session for the given |instance_id|.
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// Returns a NotFound error if no session exists.
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absl::Status StopSession(const std::string& instance_id)
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ABSL_LOCKS_EXCLUDED(sessions_mutex_);
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// Shuts down all existing MultiSessions.
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absl::Status Shutdown() ABSL_LOCKS_EXCLUDED(sessions_mutex_);
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private:
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// Stops the session for the given |instance_id|. Returns a NotFound error if
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// no session exists.
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absl::Status StopSessionInternal(const std::string& instance_id)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(sessions_mutex_);
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// Returns the MultiSession for the given workstation directory |src_dir| or
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// nullptr if it does not exist.
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MultiSession* GetMultiSession(const std::string& src_dir)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(sessions_mutex_);
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// Gets an existing MultiSession or creates a new one for the given
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// workstation directory |src_dir|.
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absl::StatusOr<MultiSession*> GetOrCreateMultiSession(
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const std::string& src_dir)
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ABSL_EXCLUSIVE_LOCKS_REQUIRED(sessions_mutex_);
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// Sets session start status for a metrics event.
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void SetSessionStartStatus(metrics::DeveloperLogEvent* evt,
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absl::Status absl_status,
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metrics::SessionStartStatus status) const;
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const SessionConfig cfg_;
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ProcessFactory* const process_factory_;
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metrics::MetricsService* const metrics_service_;
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absl::Mutex sessions_mutex_;
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using SessionMap =
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std::unordered_map<std::string, std::unique_ptr<MultiSession>>;
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SessionMap sessions_ ABSL_GUARDED_BY(sessions_mutex_);
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};
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} // namespace cdc_ft
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#endif // CDC_STREAM_SESSION_MANAGER_H_
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