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content / browser / service_worker / service_worker_single_script_update_checker.h [blame]
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SINGLE_SCRIPT_UPDATE_CHECKER_H_
#define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SINGLE_SCRIPT_UPDATE_CHECKER_H_
#include "base/time/time.h"
#include "content/browser/renderer_host/policy_container_host.h"
#include "content/browser/service_worker/service_worker_updated_script_loader.h"
#include "content/common/content_export.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "services/network/public/cpp/cross_origin_resource_policy.h"
#include "services/network/public/mojom/url_loader.mojom.h"
#include "third_party/blink/public/common/service_worker/service_worker_status_code.h"
#include "third_party/blink/public/mojom/loader/fetch_client_settings_object.mojom-forward.h"
namespace network {
class MojoToNetPendingBuffer;
class SharedURLLoaderFactory;
} // namespace network
namespace content {
class BrowserContext;
class ServiceWorkerCacheWriter;
// Executes byte-for-byte update check of one script. This loads the script from
// the network and compares it with the stored counterpart read from
// |compare_reader|. The result will be passed as an argument of |callback|:
// true when they are identical and false otherwise. When |callback| is
// triggered, |cache_writer_| owned by |this| should be paused if the scripts
// were not identical.
class CONTENT_EXPORT ServiceWorkerSingleScriptUpdateChecker
: public network::mojom::URLLoaderClient {
public:
// Result of the comparison of a single script.
enum class Result {
kNotCompared,
kFailed,
kIdentical,
kDifferent,
};
// These values indicate if the update check returns the updated sha256
// checksum from |cache_writer_|.
//
// kDefault: By default, this class doesn't handle the script sha256
// checksum. The checksum is updated only when there is a cache mismatch but
// this class never checks it.
// kForceUpdate: If this value is passed to the ctor of this class,
// the checksum is updated even when there is no cache mismatch, and the
// updated checksum is passed to the |ResultCallback| param only if the check
// result is |kIdentical|. If the result is |kDifferent| or others, the
// checksum wouldn't be passed.
enum class ScriptChecksumUpdateOption {
kDefault,
kForceUpdate,
};
// This contains detailed error info of update check when it failed.
struct CONTENT_EXPORT FailureInfo {
FailureInfo(blink::ServiceWorkerStatusCode status,
const std::string& error_message,
network::URLLoaderCompletionStatus network_status);
~FailureInfo();
const blink::ServiceWorkerStatusCode status;
const std::string error_message;
const network::URLLoaderCompletionStatus network_status;
};
// The paused state consists of Mojo endpoints and a cache writer
// detached/paused in the middle of loading script body and would be used in
// the left steps of the update process.
struct CONTENT_EXPORT PausedState {
PausedState(
std::unique_ptr<ServiceWorkerCacheWriter> cache_writer,
std::unique_ptr<blink::ThrottlingURLLoader> network_loader,
mojo::Remote<network::mojom::URLLoaderClient> network_client_remote,
mojo::PendingReceiver<network::mojom::URLLoaderClient>
network_client_receiver,
scoped_refptr<network::MojoToNetPendingBuffer> pending_network_buffer,
uint32_t consumed_bytes,
ServiceWorkerUpdatedScriptLoader::LoaderState network_loader_state,
ServiceWorkerUpdatedScriptLoader::WriterState body_writer_state);
PausedState(const PausedState& other) = delete;
PausedState& operator=(const PausedState& other) = delete;
~PausedState();
std::unique_ptr<ServiceWorkerCacheWriter> cache_writer;
std::unique_ptr<blink::ThrottlingURLLoader> network_loader;
// The endpoint called by `network_loader`. That needs to be alive while
// `network_loader` is alive.
//
// We need to keep the mojo::Remote<network::mojom::URLLoaderClient> because
// `network_loader` keeps a pointer to the mojo::Remote. This means
// when ServiceWorkerSingleScriptUpdateChecker pauses loading the script
// and passes the state to SWUpdatedScriptLoader, the Mojo's pipe works as
// a queue that stores incoming method calls by ThrottlingURLLoader.
// Once the Mojo's receiver for network::mojom::URLLoaderClient is re-bound
// to SWUpdatedScriptLoader, the queued method calls are invoked.
// Note that this can't be mojo::PendingRemote because `network_loader`
// holds a raw pointer to the instance of `network_client_remote`.
mojo::Remote<network::mojom::URLLoaderClient> network_client_remote;
// The other side of endpoint for `network_loader`. This is connected to
// `network_client_remote`.
mojo::PendingReceiver<network::mojom::URLLoaderClient>
network_client_receiver;
// The buffer which has a part of the body from the network which had a
// diff. This could be nullptr when the data from the network is smaller
// than the data in the disk.
scoped_refptr<network::MojoToNetPendingBuffer> pending_network_buffer;
// The number of bytes in |pending_network_buffer| that have already been
// processed by the cache writer.
uint32_t consumed_bytes;
ServiceWorkerUpdatedScriptLoader::LoaderState network_loader_state;
ServiceWorkerUpdatedScriptLoader::WriterState body_writer_state;
};
// This callback is only called after all of the work is done by the checker.
// It notifies the check result to the callback and the ownership of
// internal state variables (the cache writer and Mojo endpoints for loading)
// is transferred to the callback in the PausedState only when the result is
// Result::kDifferent. Otherwise it's set to nullptr. FailureInfo is set to a
// valid value if the result is Result::kFailed, otherwise it'll be nullptr.
using ResultCallback = base::OnceCallback<void(
const GURL&,
Result,
std::unique_ptr<FailureInfo>,
std::unique_ptr<PausedState>,
const std::optional<std::string>& sha256_checksum)>;
ServiceWorkerSingleScriptUpdateChecker() = delete;
// Both |compare_reader| and |copy_reader| should be created from the same
// resource ID, and this ID should locate where the script specified with
// |script_url| is stored. |writer| should be created with a new resource ID.
// |main_script_url| could be different from |script_url| when the script is
// imported.
ServiceWorkerSingleScriptUpdateChecker(
const GURL& script_url,
bool is_main_script,
const GURL& main_script_url,
const GURL& scope,
bool force_bypass_cache,
blink::mojom::ScriptType worker_script_type,
blink::mojom::ServiceWorkerUpdateViaCache update_via_cache,
const blink::mojom::FetchClientSettingsObjectPtr&
fetch_client_settings_object,
base::TimeDelta time_since_last_check,
BrowserContext* browser_context,
scoped_refptr<network::SharedURLLoaderFactory> loader_factory,
mojo::Remote<storage::mojom::ServiceWorkerResourceReader> compare_reader,
mojo::Remote<storage::mojom::ServiceWorkerResourceReader> copy_reader,
mojo::Remote<storage::mojom::ServiceWorkerResourceWriter> writer,
int64_t write_resource_id,
ScriptChecksumUpdateOption script_checksum_update_option,
const blink::StorageKey& storage_key,
ResultCallback callback);
ServiceWorkerSingleScriptUpdateChecker(
const ServiceWorkerSingleScriptUpdateChecker&) = delete;
ServiceWorkerSingleScriptUpdateChecker& operator=(
const ServiceWorkerSingleScriptUpdateChecker&) = delete;
~ServiceWorkerSingleScriptUpdateChecker() override;
// network::mojom::URLLoaderClient override:
void OnReceiveEarlyHints(network::mojom::EarlyHintsPtr early_hints) override;
void OnReceiveResponse(
network::mojom::URLResponseHeadPtr response_head,
mojo::ScopedDataPipeConsumerHandle consumer,
std::optional<mojo_base::BigBuffer> cached_metadata) override;
void OnReceiveRedirect(
const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr response_head) override;
void OnUploadProgress(int64_t current_position,
int64_t total_size,
OnUploadProgressCallback ack_callback) override;
void OnTransferSizeUpdated(int32_t transfer_size_diff) override;
void OnComplete(const network::URLLoaderCompletionStatus& status) override;
bool network_accessed() const { return network_accessed_; }
const scoped_refptr<PolicyContainerHost> policy_container_host() const {
return policy_container_host_;
}
static const char* ResultToString(Result result);
private:
class WrappedIOBuffer;
void WriteHeaders(network::mojom::URLResponseHeadPtr response_head);
void OnWriteHeadersComplete(net::Error error);
void MaybeStartNetworkConsumerHandleWatcher();
void OnNetworkDataAvailable(MojoResult,
const mojo::HandleSignalsState& state);
void CompareData(
scoped_refptr<network::MojoToNetPendingBuffer> pending_buffer,
uint32_t bytes_available);
void OnCompareDataComplete(
scoped_refptr<network::MojoToNetPendingBuffer> pending_buffer,
uint32_t bytes_written,
net::Error error);
// Called when the update check for this script failed. It calls Finish().
void Fail(blink::ServiceWorkerStatusCode status,
const std::string& error_message,
network::URLLoaderCompletionStatus network_status);
// Called when the update check for this script succeeded. It calls Finish().
// |paused_state| should be set when result is kDifferent.
void Succeed(Result result, std::unique_ptr<PausedState> paused_state);
void Finish(Result result,
std::unique_ptr<PausedState> paused_state,
std::unique_ptr<FailureInfo> failure_info,
const std::optional<std::string>& sha256_checksum);
const GURL script_url_;
const bool is_main_script_;
const GURL scope_;
const bool force_bypass_cache_;
const blink::mojom::ServiceWorkerUpdateViaCache update_via_cache_;
const base::TimeDelta time_since_last_check_;
bool network_accessed_ = false;
const ScriptChecksumUpdateOption script_checksum_update_option_ =
ScriptChecksumUpdateOption::kDefault;
scoped_refptr<PolicyContainerHost> policy_container_host_;
// The endpoint called by `network_loader_`. That needs to be alive while
// `network_loader_` is alive.
mojo::Remote<network::mojom::URLLoaderClient> network_client_remote_;
mojo::Receiver<network::mojom::URLLoaderClient> network_client_receiver_{
this};
mojo::ScopedDataPipeConsumerHandle network_consumer_;
mojo::SimpleWatcher network_watcher_;
// `network_loader_` needs to be declared after `network_client_remote_`
// because the former holds a `raw_ptr` on the latter, and thus it needs to
// be destroyed first to avoid holding a dangling pointer.
std::unique_ptr<blink::ThrottlingURLLoader> network_loader_;
std::unique_ptr<ServiceWorkerCacheWriter> cache_writer_;
ResultCallback callback_;
// Represents the state of |network_loader_|.
// Corresponds to the steps described in the class comments.
//
// CreateLoaderAndStart(): kNotStarted -> kLoadingHeader
// OnReceiveResponse(): kLoadingHeader -> kLoadingBody
// OnComplete(): kLoadingBody -> kCompleted
ServiceWorkerUpdatedScriptLoader::LoaderState network_loader_state_ =
ServiceWorkerUpdatedScriptLoader::LoaderState::kNotStarted;
// Represents the state of |cache_writer_|.
// Set to kWriting when it starts to send the header to |cache_writer_|, and
// set to kCompleted when the header has been sent.
//
// OnReceiveResponse(): kNotStarted -> kWriting (in WriteHeaders())
// OnWriteHeadersComplete(): kWriting -> kCompleted
ServiceWorkerUpdatedScriptLoader::WriterState header_writer_state_ =
ServiceWorkerUpdatedScriptLoader::WriterState::kNotStarted;
// Represents the state of |cache_writer_| and |network_consumer_|.
// Set to kWriting when |this| starts watching |network_consumer_|, and set to
// kCompleted when |cache_writer_| reports any difference between the stored
// body and the network body, or the entire body is compared without any
// difference.
//
// When response body exists:
// OnReceiveResponsey() && OnWriteHeadersComplete():
// kNotStarted -> kWriting
// OnNetworkDataAvailable() && MOJO_RESULT_FAILED_PRECONDITION:
// kWriting -> kCompleted
//
// When response body is empty:
// OnComplete(): kNotStarted -> kCompleted
ServiceWorkerUpdatedScriptLoader::WriterState body_writer_state_ =
ServiceWorkerUpdatedScriptLoader::WriterState::kNotStarted;
base::WeakPtrFactory<ServiceWorkerSingleScriptUpdateChecker> weak_factory_{
this};
};
} // namespace content
#endif // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_SINGLE_SCRIPT_UPDATE_CHECKER_H_