mirror of
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b35a0f4718
Removes gogo/protobuf from buildx and updates to a version of moby/buildkit where gogo is removed. This also changes how the proto files are generated. This is because newer versions of protobuf are more strict about name conflicts. If two files have the same name (even if they are relative paths) and are used in different protoc commands, they'll conflict in the registry. Since protobuf file generation doesn't work very well with `paths=source_relative`, this removes the `go:generate` expression and just relies on the dockerfile to perform the generation. Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>
108 lines
3.9 KiB
Markdown
108 lines
3.9 KiB
Markdown
# gRPC-Go
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[][API]
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[](https://goreportcard.com/report/github.com/grpc/grpc-go)
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[](https://codecov.io/gh/grpc/grpc-go)
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The [Go][] implementation of [gRPC][]: A high performance, open source, general
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RPC framework that puts mobile and HTTP/2 first. For more information see the
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[Go gRPC docs][], or jump directly into the [quick start][].
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## Prerequisites
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- **[Go][]**: any one of the **two latest major** [releases][go-releases].
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## Installation
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Simply add the following import to your code, and then `go [build|run|test]`
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will automatically fetch the necessary dependencies:
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```go
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import "google.golang.org/grpc"
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```
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> **Note:** If you are trying to access `grpc-go` from **China**, see the
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> [FAQ](#FAQ) below.
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## Learn more
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- [Go gRPC docs][], which include a [quick start][] and [API
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reference][API] among other resources
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- [Low-level technical docs](Documentation) from this repository
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- [Performance benchmark][]
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- [Examples](examples)
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## FAQ
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### I/O Timeout Errors
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The `golang.org` domain may be blocked from some countries. `go get` usually
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produces an error like the following when this happens:
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```console
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$ go get -u google.golang.org/grpc
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package google.golang.org/grpc: unrecognized import path "google.golang.org/grpc" (https fetch: Get https://google.golang.org/grpc?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
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```
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To build Go code, there are several options:
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- Set up a VPN and access google.golang.org through that.
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- With Go module support: it is possible to use the `replace` feature of `go
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mod` to create aliases for golang.org packages. In your project's directory:
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```sh
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go mod edit -replace=google.golang.org/grpc=github.com/grpc/grpc-go@latest
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go mod tidy
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go mod vendor
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go build -mod=vendor
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```
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Again, this will need to be done for all transitive dependencies hosted on
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golang.org as well. For details, refer to [golang/go issue
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#28652](https://github.com/golang/go/issues/28652).
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### Compiling error, undefined: grpc.SupportPackageIsVersion
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Please update to the latest version of gRPC-Go using
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`go get google.golang.org/grpc`.
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### How to turn on logging
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The default logger is controlled by environment variables. Turn everything on
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like this:
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```console
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$ export GRPC_GO_LOG_VERBOSITY_LEVEL=99
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$ export GRPC_GO_LOG_SEVERITY_LEVEL=info
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```
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### The RPC failed with error `"code = Unavailable desc = transport is closing"`
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This error means the connection the RPC is using was closed, and there are many
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possible reasons, including:
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1. mis-configured transport credentials, connection failed on handshaking
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1. bytes disrupted, possibly by a proxy in between
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1. server shutdown
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1. Keepalive parameters caused connection shutdown, for example if you have
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configured your server to terminate connections regularly to [trigger DNS
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lookups](https://github.com/grpc/grpc-go/issues/3170#issuecomment-552517779).
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If this is the case, you may want to increase your
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[MaxConnectionAgeGrace](https://pkg.go.dev/google.golang.org/grpc/keepalive?tab=doc#ServerParameters),
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to allow longer RPC calls to finish.
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It can be tricky to debug this because the error happens on the client side but
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the root cause of the connection being closed is on the server side. Turn on
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logging on __both client and server__, and see if there are any transport
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errors.
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[API]: https://pkg.go.dev/google.golang.org/grpc
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[Go]: https://golang.org
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[Go module]: https://github.com/golang/go/wiki/Modules
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[gRPC]: https://grpc.io
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[Go gRPC docs]: https://grpc.io/docs/languages/go
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[Performance benchmark]: https://performance-dot-grpc-testing.appspot.com/explore?dashboard=5180705743044608
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[quick start]: https://grpc.io/docs/languages/go/quickstart
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[go-releases]: https://golang.org/doc/devel/release.html
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