commit | 78864797b87780af8d88b2d4d64721020abbe7ea | [log] [tgz] |
---|---|---|
author | Menghan Li <menghanl@google.com> | Wed Nov 18 17:12:51 2020 -0800 |
committer | GitHub <noreply@github.com> | Wed Nov 18 17:12:51 2020 -0800 |
tree | 45fe0a2fab7326e459a2abaad4c2ffe1f1e5b198 | |
parent | 230166b6df4ad811bddc77ff5f54251448236ff9 [diff] |
balancer: set RPC metadata in address attributes, instead of Metadata field (#4041) This metadata will be sent with all RPCs on the created SubConn
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.
With Go module support (Go 1.11+), simply add the following import
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:
$ go get -u google.golang.org/grpc
Note: If you are trying to access
grpc-go
from China, see the FAQ below.
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. For details, refer to golang/go issue #28652.
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
)
Update the 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 environment variables. Turn everything on like this:
$ export GRPC_GO_LOG_VERBOSITY_LEVEL=99 $ export 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.