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 gRPC Quick Start: Go guide.
To install this package, you need to install Go and setup your Go workspace on your computer. The simplest way to install the library is to run:
$ go get -u google.golang.org/grpc
With Go module support (Go 1.11+), simply import "google.golang.org/grpc"
in your source code and go [build|run|test]
will automatically download the necessary dependencies (Go modules ref).
If you are trying to access grpc-go from within China, please see the FAQ below.
gRPC-Go requires Go 1.9 or later.
Performance benchmark data for grpc-go and other languages is maintained in this dashboard.
General Availability Google Cloud Platform Launch Stages.
The golang.org
domain may be blocked from some countries. go get
usually produces an error like the following when this happens:
$ 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:
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:
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. Please refer to this issue in the golang repo regarding this concern.
Please 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:
module <your module name> require ( google.golang.org/grpc v1.27.0 )
Please update proto package, gRPC package and rebuild the proto files:
go get -u github.com/golang/protobuf/{proto,protoc-gen-go}
go get -u google.golang.org/grpc
protoc --go_out=plugins=grpc:. *.proto
The default logger is controlled by the environment variables. Turn everything on by setting:
GRPC_GO_LOG_VERBOSITY_LEVEL=99 GRPC_GO_LOG_SEVERITY_LEVEL=info
"code = Unavailable desc = transport is closing"
This error means the connection the RPC is using was closed, and there are many possible reasons, including:
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.