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Diffstat (limited to 'src/mongo/transport/grpc/client_context.h')
-rw-r--r-- | src/mongo/transport/grpc/client_context.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/mongo/transport/grpc/client_context.h b/src/mongo/transport/grpc/client_context.h new file mode 100644 index 00000000000..b4b8238cce6 --- /dev/null +++ b/src/mongo/transport/grpc/client_context.h @@ -0,0 +1,92 @@ +/** + * Copyright (C) 2023-present MongoDB, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the Server Side Public License, version 1, + * as published by MongoDB, Inc. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * Server Side Public License for more details. + * + * You should have received a copy of the Server Side Public License + * along with this program. If not, see + * <http://www.mongodb.com/licensing/server-side-public-license>. + * + * As a special exception, the copyright holders give permission to link the + * code of portions of this program with the OpenSSL library under certain + * conditions as described in each individual source file and distribute + * linked combinations including the program with the OpenSSL library. You + * must comply with the Server Side Public License in all respects for + * all of the code used other than as permitted herein. If you modify file(s) + * with this exception, you may extend this exception to your version of the + * file(s), but you are not obligated to do so. If you do not wish to do so, + * delete this exception statement from your version. If you delete this + * exception statement from all source files in the program, then also delete + * it in the license file. + */ + +#pragma once + +#include <map> +#include <string> + +#include "mongo/transport/grpc/metadata.h" +#include "mongo/util/net/hostandport.h" +#include "mongo/util/time_support.h" + +namespace mongo::transport::grpc { + +/** + * Base class modeling a gRPC ClientContext. + * See: https://grpc.github.io/grpc/cpp/classgrpc_1_1_client_context.html + */ +class ClientContext { +public: + virtual ~ClientContext() = default; + + /** + * Add an entry to the metadata associated with the RPC. + * + * This must only be called before invoking the RPC. + */ + virtual void addMetadataEntry(const std::string& key, const std::string& value) = 0; + + /** + * Retrieve the server's initial metadata. + * + * This must only be called after the first message has been received on the ClientStream + * created from the RPC that this context is associated with. + */ + virtual boost::optional<const MetadataContainer&> getServerInitialMetadata() const = 0; + + /** + * Set the deadline for the RPC to be executed using this context. + * + * This must only be called before invoking the RPC. + */ + virtual void setDeadline(Date_t deadline) = 0; + + virtual Date_t getDeadline() const = 0; + + virtual HostAndPort getRemote() const = 0; + + /** + * Send a best-effort out-of-band cancel on the call associated with this ClientContext. There + * is no guarantee the call will be cancelled (e.g. if the call has already finished by the time + * the cancellation is received). + * + * Note that tryCancel() will not impede the execution of any already scheduled work (e.g. + * messages already queued to be sent on a stream will still be sent), though the reported + * sucess or failure of such work may reflect the cancellation. + * + * This method is thread-safe, and can be called multiple times from any thread. It should not + * be called before this ClientContext has been used to invoke an RPC. + * + * See: + * https://grpc.github.io/grpc/cpp/classgrpc_1_1_client_context.html#abd0f6715c30287b75288015eee628984 + */ + virtual void tryCancel() = 0; +}; +} // namespace mongo::transport::grpc |