mirror of https://github.com/grpc/grpc.git
thinkerou
9 years ago
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## **gRPC Compression** |
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|
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The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", |
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"SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be |
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interpreted as described in [RFC 2119](http://www.ietf.org/rfc/rfc2119.txt). |
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|
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### Intent |
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|
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Compression is used to reduce the amount of bandwidth used between peers. The |
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compression supported by gRPC acts _at the individual message level_, taking |
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_message_ [as defined in the wire format |
||||
document](PROTOCOL-HTTP2.md). |
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|
||||
The implementation supports different compression algorithms. A _default |
||||
compression level_, to be used in the absence of message-specific settings, MAY |
||||
be specified for during channel creation. |
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|
||||
The ability to control compression settings per call and to enable/disable |
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compression on a per message basis MAY be used to prevent CRIME/BEAST attacks. |
||||
It also allows for asymmetric compression communication, whereby a response MAY |
||||
be compressed differently, if at all. |
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|
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### Specification |
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|
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Compression MAY be configured by the Client Application by calling the |
||||
appropriate API method. There are two scenarios where compression MAY be |
||||
configured: |
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|
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+ At channel creation time, which sets the channel default compression and |
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therefore the compression that SHALL be used in the absence of per-RPC |
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compression configuration. |
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+ At response time, via: |
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+ For unary RPCs, the {Client,Server}Context instance. |
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+ For streaming RPCs, the {Client,Server}Writer instance. In this case, |
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configuration is reduced to disabling compression altogether. |
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|
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### Compression Method Asymmetry Between Peers |
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|
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A gRPC peer MAY choose to respond using a different compression method to that |
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of the request, including not performing any compression, regardless of channel |
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and RPC settings (for example, if compression would result in small or negative |
||||
gains). |
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|
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When a message from a client compressed with an unsupported algorithm is |
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processed by a server, it WILL result in an `UNIMPLEMENTED` error status on the |
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server. The server will then include in its response a `grpc-accept-encoding` |
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header specifying the algorithms it does accept. If an `UNIMPLEMENTED` error |
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status is returned from the server despite having used one of the algorithms |
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from the `grpc-accept-encoding` header, the cause MUST NOT be related to |
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compression. Data sent from a server compressed with an algorithm not supported |
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by the client WILL result in an `INTERNAL` error status on the client side. |
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|
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Note that a peer MAY choose to not disclose all the encodings it supports. |
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However, if it receives a message compressed in an undisclosed but supported |
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encoding, it MUST include said encoding in the response's `grpc-accept-encoding |
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h`eader. |
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|
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For every message a server is requested to compress using an algorithm it knows |
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the client doesn't support (as indicated by the last `grpc-accept-encoding` |
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header received from the client), it SHALL send the message uncompressed. |
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|
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### Specific Disabling of Compression |
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|
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If the user (through the previously described mechanisms) requests to disable |
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compression the next message MUST be sent uncompressed. This is instrumental in |
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preventing BEAST/CRIME attacks. This applies to both the the unary and streaming |
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cases. |
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|
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### Compression Levels and Algorithms |
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|
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The set of supported algorithm is implementation dependent. In order to simplify |
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the public API and to operate seamlessly across implementations (both in terms |
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of languages but also different version of the same one), we introduce the idea |
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of _compression levels_ (such as "low", "medium", "high"). |
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|
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Levels map to concrete algorithms and/or their settings (such as "low" mapping |
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to "gzip -3" and "high" mapping to "gzip -9") automatically depending on what a |
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peer is known to support. A server is always aware of what its clients support, |
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as clients disclose it in their Message-Accept-Encoding header as part of their |
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initial call. A client doesn't a priori (presently) know which algorithms a |
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server supports. This issue can be addressed with an initial negotiation of |
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capabilities or an automatic retry mechanism. These features will be implemented |
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in the future. Currently however, compression levels are only supported at the |
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server side, which is aware of the client's capabilities through the incoming |
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Message-Accept-Encoding header. |
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|
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### Propagation to child RPCs |
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|
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The inheritance of the compression configuration by child RPCs is left up to the |
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implementation. Note that in the absence of changes to the parent channel, its |
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configuration will be used. |
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|
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### Test cases |
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|
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1. When a compression level is not specified for either the channel or the |
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message, the default channel level _none_ is considered: data MUST NOT be |
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compressed. |
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1. When per-RPC compression configuration isn't present for a message, the |
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channel compression configuration MUST be used. |
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1. When a compression method (including no compression) is specified for an |
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outgoing message, the message MUST be compressed accordingly. |
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1. A message compressed by a client in a way not supported by its server MUST |
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fail with status `UNIMPLEMENTED`, its associated description indicating the |
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unsupported condition as well as the supported ones. The returned |
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`grpc-accept-encoding` header MUST NOT contain the compression method |
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(encoding) used. |
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1. A message compressed by a server in a way not supported by its client MUST |
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fail with status `INTERNAL`, its associated description indicating the |
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unsupported condition as well as the supported ones. The returned |
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`grpc-accept-encoding` header MUST NOT contain the compression method |
||||
(encoding) used. |
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1. An ill-constructed message with its [Compressed-Flag |
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bit](PROTOCOL-HTTP2.md#compressed-flag) |
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set but lacking a |
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"[grpc-encoding](PROTOCOL-HTTP2.md#message-encoding)" |
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entry different from _identity_ in its metadata MUST fail with `INTERNAL` |
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status, its associated description indicating the invalid Compressed-Flag |
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condition. |
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@ -0,0 +1,91 @@ |
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@ -1,152 +0,0 @@ |
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/*
|
||||
* |
||||
* Copyright 2016, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#ifndef GRPCXX_IMPL_CODEGEN_IMPL_STATUS_CODE_ENUM_H |
||||
#define GRPCXX_IMPL_CODEGEN_IMPL_STATUS_CODE_ENUM_H |
||||
|
||||
namespace grpc { |
||||
|
||||
enum StatusCode { |
||||
/// Not an error; returned on success.
|
||||
OK = 0, |
||||
|
||||
/// The operation was cancelled (typically by the caller).
|
||||
CANCELLED = 1, |
||||
|
||||
/// Unknown error. An example of where this error may be returned is if a
|
||||
/// Status value received from another address space belongs to an error-space
|
||||
/// that is not known in this address space. Also errors raised by APIs that
|
||||
/// do not return enough error information may be converted to this error.
|
||||
UNKNOWN = 2, |
||||
|
||||
/// Client specified an invalid argument. Note that this differs from
|
||||
/// FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments that are
|
||||
/// problematic regardless of the state of the system (e.g., a malformed file
|
||||
/// name).
|
||||
INVALID_ARGUMENT = 3, |
||||
|
||||
/// Deadline expired before operation could complete. For operations that
|
||||
/// change the state of the system, this error may be returned even if the
|
||||
/// operation has completed successfully. For example, a successful response
|
||||
/// from a server could have been delayed long enough for the deadline to
|
||||
/// expire.
|
||||
DEADLINE_EXCEEDED = 4, |
||||
|
||||
/// Some requested entity (e.g., file or directory) was not found.
|
||||
NOT_FOUND = 5, |
||||
|
||||
/// Some entity that we attempted to create (e.g., file or directory) already
|
||||
/// exists.
|
||||
ALREADY_EXISTS = 6, |
||||
|
||||
/// The caller does not have permission to execute the specified operation.
|
||||
/// PERMISSION_DENIED must not be used for rejections caused by exhausting
|
||||
/// some resource (use RESOURCE_EXHAUSTED instead for those errors).
|
||||
/// PERMISSION_DENIED must not be used if the caller can not be identified
|
||||
/// (use UNAUTHENTICATED instead for those errors).
|
||||
PERMISSION_DENIED = 7, |
||||
|
||||
/// The request does not have valid authentication credentials for the
|
||||
/// operation.
|
||||
UNAUTHENTICATED = 16, |
||||
|
||||
/// Some resource has been exhausted, perhaps a per-user quota, or perhaps the
|
||||
/// entire file system is out of space.
|
||||
RESOURCE_EXHAUSTED = 8, |
||||
|
||||
/// Operation was rejected because the system is not in a state required for
|
||||
/// the operation's execution. For example, directory to be deleted may be
|
||||
/// non-empty, an rmdir operation is applied to a non-directory, etc.
|
||||
///
|
||||
/// A litmus test that may help a service implementor in deciding
|
||||
/// between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE:
|
||||
/// (a) Use UNAVAILABLE if the client can retry just the failing call.
|
||||
/// (b) Use ABORTED if the client should retry at a higher-level
|
||||
/// (e.g., restarting a read-modify-write sequence).
|
||||
/// (c) Use FAILED_PRECONDITION if the client should not retry until
|
||||
/// the system state has been explicitly fixed. E.g., if an "rmdir"
|
||||
/// fails because the directory is non-empty, FAILED_PRECONDITION
|
||||
/// should be returned since the client should not retry unless
|
||||
/// they have first fixed up the directory by deleting files from it.
|
||||
/// (d) Use FAILED_PRECONDITION if the client performs conditional
|
||||
/// REST Get/Update/Delete on a resource and the resource on the
|
||||
/// server does not match the condition. E.g., conflicting
|
||||
/// read-modify-write on the same resource.
|
||||
FAILED_PRECONDITION = 9, |
||||
|
||||
/// The operation was aborted, typically due to a concurrency issue like
|
||||
/// sequencer check failures, transaction aborts, etc.
|
||||
///
|
||||
/// See litmus test above for deciding between FAILED_PRECONDITION, ABORTED,
|
||||
/// and UNAVAILABLE.
|
||||
ABORTED = 10, |
||||
|
||||
/// Operation was attempted past the valid range. E.g., seeking or reading
|
||||
/// past end of file.
|
||||
///
|
||||
/// Unlike INVALID_ARGUMENT, this error indicates a problem that may be fixed
|
||||
/// if the system state changes. For example, a 32-bit file system will
|
||||
/// generate INVALID_ARGUMENT if asked to read at an offset that is not in the
|
||||
/// range [0,2^32-1], but it will generate OUT_OF_RANGE if asked to read from
|
||||
/// an offset past the current file size.
|
||||
///
|
||||
/// There is a fair bit of overlap between FAILED_PRECONDITION and
|
||||
/// OUT_OF_RANGE. We recommend using OUT_OF_RANGE (the more specific error)
|
||||
/// when it applies so that callers who are iterating through a space can
|
||||
/// easily look for an OUT_OF_RANGE error to detect when they are done.
|
||||
OUT_OF_RANGE = 11, |
||||
|
||||
/// Operation is not implemented or not supported/enabled in this service.
|
||||
UNIMPLEMENTED = 12, |
||||
|
||||
/// Internal errors. Means some invariants expected by underlying System has
|
||||
/// been broken. If you see one of these errors, Something is very broken.
|
||||
INTERNAL = 13, |
||||
|
||||
/// The service is currently unavailable. This is a most likely a transient
|
||||
/// condition and may be corrected by retrying with a backoff.
|
||||
///
|
||||
/// See litmus test above for deciding between FAILED_PRECONDITION, ABORTED,
|
||||
/// and UNAVAILABLE.
|
||||
UNAVAILABLE = 14, |
||||
|
||||
/// Unrecoverable data loss or corruption.
|
||||
DATA_LOSS = 15, |
||||
|
||||
/// Force users to include a default branch:
|
||||
DO_NOT_USE = -1 |
||||
}; |
||||
|
||||
} // namespace grpc
|
||||
|
||||
#endif // GRPCXX_IMPL_CODEGEN_IMPL_STATUS_CODE_ENUM_H
|
||||
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