mirror of
https://github.com/Luzifer/nginx-sso.git
synced 2024-12-25 15:21:16 +00:00
81 lines
3.5 KiB
Markdown
81 lines
3.5 KiB
Markdown
|
# Compression
|
||
|
|
|
||
|
|
The preferred method for configuring message compression on both clients and
|
||
|
|
servers is to use
|
||
|
|
[`encoding.RegisterCompressor`](https://godoc.org/google.golang.org/grpc/encoding#RegisterCompressor)
|
||
|
|
to register an implementation of a compression algorithm. See
|
||
|
|
`grpc/encoding/gzip/gzip.go` for an example of how to implement one.
|
||
|
|
|
||
|
|
Once a compressor has been registered on the client-side, RPCs may be sent using
|
||
|
|
it via the
|
||
|
|
[`UseCompressor`](https://godoc.org/google.golang.org/grpc#UseCompressor)
|
||
|
|
`CallOption`. Remember that `CallOption`s may be turned into defaults for all
|
||
|
|
calls from a `ClientConn` by using the
|
||
|
|
[`WithDefaultCallOptions`](https://godoc.org/google.golang.org/grpc#WithDefaultCallOptions)
|
||
|
|
`DialOption`. If `UseCompressor` is used and the corresponding compressor has
|
||
|
|
not been installed, an `Internal` error will be returned to the application
|
||
|
|
before the RPC is sent.
|
||
|
|
|
||
|
|
Server-side, registered compressors will be used automatically to decode request
|
||
|
|
messages and encode the responses. Servers currently always respond using the
|
||
|
|
same compression method specified by the client. If the corresponding
|
||
|
|
compressor has not been registered, an `Unimplemented` status will be returned
|
||
|
|
to the client.
|
||
|
|
|
||
|
|
## Deprecated API
|
||
|
|
|
||
|
|
There is a deprecated API for setting compression as well. It is not
|
||
|
|
recommended for use. However, if you were previously using it, the following
|
||
|
|
section may be helpful in understanding how it works in combination with the new
|
||
|
|
API.
|
||
|
|
|
||
|
|
### Client-Side
|
||
|
|
|
||
|
|
There are two legacy functions and one new function to configure compression:
|
||
|
|
|
||
|
|
```go
|
||
|
|
func WithCompressor(grpc.Compressor) DialOption {}
|
||
|
|
func WithDecompressor(grpc.Decompressor) DialOption {}
|
||
|
|
func UseCompressor(name) CallOption {}
|
||
|
|
```
|
||
|
|
|
||
|
|
For outgoing requests, the following rules are applied in order:
|
||
|
|
1. If `UseCompressor` is used, messages will be compressed using the compressor
|
||
|
|
named.
|
||
|
|
* If the compressor named is not registered, an Internal error is returned
|
||
|
|
back to the client before sending the RPC.
|
||
|
|
* If UseCompressor("identity"), no compressor will be used, but "identity"
|
||
|
|
will be sent in the header to the server.
|
||
|
|
1. If `WithCompressor` is used, messages will be compressed using that
|
||
|
|
compressor implementation.
|
||
|
|
1. Otherwise, outbound messages will be uncompressed.
|
||
|
|
|
||
|
|
For incoming responses, the following rules are applied in order:
|
||
|
|
1. If `WithDecompressor` is used and it matches the message's encoding, it will
|
||
|
|
be used.
|
||
|
|
1. If a registered compressor matches the response's encoding, it will be used.
|
||
|
|
1. Otherwise, the stream will be closed and an `Unimplemented` status error will
|
||
|
|
be returned to the application.
|
||
|
|
|
||
|
|
### Server-Side
|
||
|
|
|
||
|
|
There are two legacy functions to configure compression:
|
||
|
|
```go
|
||
|
|
func RPCCompressor(grpc.Compressor) ServerOption {}
|
||
|
|
func RPCDecompressor(grpc.Decompressor) ServerOption {}
|
||
|
|
```
|
||
|
|
|
||
|
|
For incoming requests, the following rules are applied in order:
|
||
|
|
1. If `RPCDecompressor` is used and that decompressor matches the request's
|
||
|
|
encoding: it will be used.
|
||
|
|
1. If a registered compressor matches the request's encoding, it will be used.
|
||
|
|
1. Otherwise, an `Unimplemented` status will be returned to the client.
|
||
|
|
|
||
|
|
For outgoing responses, the following rules are applied in order:
|
||
|
|
1. If `RPCCompressor` is used, that compressor will be used to compress all
|
||
|
|
response messages.
|
||
|
|
1. If compression was used for the incoming request and a registered compressor
|
||
|
|
supports it, that same compression method will be used for the outgoing
|
||
|
|
response.
|
||
|
|
1. Otherwise, no compression will be used for the outgoing response.
|