The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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70 lines
3.4 KiB
70 lines
3.4 KiB
/* |
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#ifndef GRPC_INTERNAL_CORE_CHANNEL_METADATA_BUFFER_H |
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#define GRPC_INTERNAL_CORE_CHANNEL_METADATA_BUFFER_H |
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#include "src/core/channel/channel_stack.h" |
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/* Utility code to buffer GRPC_SEND_METADATA calls and pass them down the stack |
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all at once at some otherwise-determined time. Useful for implementing |
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filters that want to queue metadata until a START event chooses some |
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underlying filter stack to send an rpc on. */ |
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/* Clients should declare a member of grpc_metadata_buffer. This may at some |
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point become a typedef for a struct, but for now a pointer suffices */ |
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typedef struct grpc_metadata_buffer_impl grpc_metadata_buffer_impl; |
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typedef grpc_metadata_buffer_impl *grpc_metadata_buffer; |
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/* Initializes the metadata buffer. Allocates no memory. */ |
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void grpc_metadata_buffer_init(grpc_metadata_buffer *buffer); |
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/* Destroy the metadata buffer. */ |
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void grpc_metadata_buffer_destroy(grpc_metadata_buffer *buffer, |
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grpc_op_error error); |
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/* Append a call to the end of a metadata buffer: may allocate memory */ |
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void grpc_metadata_buffer_queue(grpc_metadata_buffer *buffer, grpc_call_op *op); |
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/* Flush all queued operations from the metadata buffer to the element below |
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self */ |
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void grpc_metadata_buffer_flush(grpc_metadata_buffer *buffer, |
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grpc_call_element *self); |
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/* Count the number of queued elements in the buffer. */ |
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size_t grpc_metadata_buffer_count(const grpc_metadata_buffer *buffer); |
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/* Extract elements as a grpc_metadata*, for presentation to applications. |
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The returned buffer must be freed with |
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grpc_metadata_buffer_cleanup_elements. |
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Clears the metadata buffer (this is a one-shot operation) */ |
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grpc_metadata *grpc_metadata_buffer_extract_elements( |
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grpc_metadata_buffer *buffer); |
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void grpc_metadata_buffer_cleanup_elements(void *elements, grpc_op_error error); |
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#endif /* GRPC_INTERNAL_CORE_CHANNEL_METADATA_BUFFER_H */
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