mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-01 04:41:22 +00:00
142 lines
4.7 KiB
Markdown
142 lines
4.7 KiB
Markdown
# gRPC-Go
|
|
|
|
[](https://travis-ci.org/grpc/grpc-go)
|
|
[][API]
|
|
[](https://goreportcard.com/report/github.com/grpc/grpc-go)
|
|
|
|
The [Go][] implementation of [gRPC][]: A high performance, open source, general
|
|
RPC framework that puts mobile and HTTP/2 first. For more information see the
|
|
[Go gRPC docs][], or jump directly into the [quick start][].
|
|
|
|
## Prerequisites
|
|
|
|
- **[Go][]**: any one of the **three latest major** [releases][go-releases].
|
|
|
|
## Installation
|
|
|
|
With [Go module][] support (Go 1.11+), simply add the following import
|
|
|
|
```go
|
|
import "google.golang.org/grpc"
|
|
```
|
|
|
|
to your code, and then `go [build|run|test]` will automatically fetch the
|
|
necessary dependencies.
|
|
|
|
Otherwise, to install the `grpc-go` package, run the following command:
|
|
|
|
```console
|
|
$ go get -u google.golang.org/grpc
|
|
```
|
|
|
|
> **Note:** If you are trying to access `grpc-go` from **China**, see the
|
|
> [FAQ](#FAQ) below.
|
|
|
|
## Learn more
|
|
|
|
- [Go gRPC docs][], which include a [quick start][] and [API
|
|
reference][API] among other resources
|
|
- [Low-level technical docs](Documentation) from this repository
|
|
- [Performance benchmark][]
|
|
- [Examples](examples)
|
|
|
|
## FAQ
|
|
|
|
### I/O Timeout Errors
|
|
|
|
The `golang.org` domain may be blocked from some countries. `go get` usually
|
|
produces an error like the following when this happens:
|
|
|
|
```console
|
|
$ go get -u google.golang.org/grpc
|
|
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)
|
|
```
|
|
|
|
To build Go code, there are several options:
|
|
|
|
- Set up a VPN and access google.golang.org through that.
|
|
|
|
- Without Go module support: `git clone` the repo manually:
|
|
|
|
```sh
|
|
git clone https://github.com/grpc/grpc-go.git $GOPATH/src/google.golang.org/grpc
|
|
```
|
|
|
|
You will need to do the same for all of grpc's dependencies in `golang.org`,
|
|
e.g. `golang.org/x/net`.
|
|
|
|
- With Go module support: it is possible to use the `replace` feature of `go
|
|
mod` to create aliases for golang.org packages. In your project's directory:
|
|
|
|
```sh
|
|
go mod edit -replace=google.golang.org/grpc=github.com/grpc/grpc-go@latest
|
|
go mod tidy
|
|
go mod vendor
|
|
go build -mod=vendor
|
|
```
|
|
|
|
Again, this will need to be done for all transitive dependencies hosted on
|
|
golang.org as well. For details, refer to [golang/go issue #28652](https://github.com/golang/go/issues/28652).
|
|
|
|
### Compiling error, undefined: grpc.SupportPackageIsVersion
|
|
|
|
#### If you are using Go modules:
|
|
|
|
Ensure your gRPC-Go version is `require`d at the appropriate version in
|
|
the same module containing the generated `.pb.go` files. For example,
|
|
`SupportPackageIsVersion6` needs `v1.27.0`, so in your `go.mod` file:
|
|
|
|
```go
|
|
module <your module name>
|
|
|
|
require (
|
|
google.golang.org/grpc v1.27.0
|
|
)
|
|
```
|
|
|
|
#### If you are *not* using Go modules:
|
|
|
|
Update the `proto` package, gRPC package, and rebuild the `.proto` files:
|
|
|
|
```sh
|
|
go get -u github.com/golang/protobuf/{proto,protoc-gen-go}
|
|
go get -u google.golang.org/grpc
|
|
protoc --go_out=plugins=grpc:. *.proto
|
|
```
|
|
|
|
### How to turn on logging
|
|
|
|
The default logger is controlled by environment variables. Turn everything on
|
|
like this:
|
|
|
|
```console
|
|
$ export GRPC_GO_LOG_VERBOSITY_LEVEL=99
|
|
$ export GRPC_GO_LOG_SEVERITY_LEVEL=info
|
|
```
|
|
|
|
### The RPC failed with error `"code = Unavailable desc = transport is closing"`
|
|
|
|
This error means the connection the RPC is using was closed, and there are many
|
|
possible reasons, including:
|
|
1. mis-configured transport credentials, connection failed on handshaking
|
|
1. bytes disrupted, possibly by a proxy in between
|
|
1. server shutdown
|
|
1. Keepalive parameters caused connection shutdown, for example if you have configured
|
|
your server to terminate connections regularly to [trigger DNS lookups](https://github.com/grpc/grpc-go/issues/3170#issuecomment-552517779).
|
|
If this is the case, you may want to increase your [MaxConnectionAgeGrace](https://pkg.go.dev/google.golang.org/grpc/keepalive?tab=doc#ServerParameters),
|
|
to allow longer RPC calls to finish.
|
|
|
|
It can be tricky to debug this because the error happens on the client side but
|
|
the root cause of the connection being closed is on the server side. Turn on
|
|
logging on __both client and server__, and see if there are any transport
|
|
errors.
|
|
|
|
[API]: https://pkg.go.dev/google.golang.org/grpc
|
|
[Go]: https://golang.org
|
|
[Go module]: https://github.com/golang/go/wiki/Modules
|
|
[gRPC]: https://grpc.io
|
|
[Go gRPC docs]: https://grpc.io/docs/languages/go
|
|
[Performance benchmark]: https://performance-dot-grpc-testing.appspot.com/explore?dashboard=5180705743044608
|
|
[quick start]: https://grpc.io/docs/languages/go/quickstart
|
|
[go-releases]: https://golang.org/doc/devel/release.html
|