micro/server/grpc/options.go

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package grpc
import (
"context"
"crypto/tls"
"net"
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"github.com/micro/go-micro/v2/broker"
"github.com/micro/go-micro/v2/codec"
"github.com/micro/go-micro/v2/registry"
"github.com/micro/go-micro/v2/server"
"github.com/micro/go-micro/v2/transport"
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"google.golang.org/grpc"
"google.golang.org/grpc/encoding"
)
type codecsKey struct{}
type grpcOptions struct{}
type netListener struct{}
type maxMsgSizeKey struct{}
type tlsAuth struct{}
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// gRPC Codec to be used to encode/decode requests for a given content type
func Codec(contentType string, c encoding.Codec) server.Option {
return func(o *server.Options) {
codecs := make(map[string]encoding.Codec)
if o.Context == nil {
o.Context = context.Background()
}
if v := o.Context.Value(codecsKey{}); v != nil {
codecs = v.(map[string]encoding.Codec)
}
codecs[contentType] = c
o.Context = context.WithValue(o.Context, codecsKey{}, codecs)
}
}
// AuthTLS should be used to setup a secure authentication using TLS
func AuthTLS(t *tls.Config) server.Option {
return func(o *server.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, tlsAuth{}, t)
}
}
// Listener specifies the net.Listener to use instead of the default
func Listener(l net.Listener) server.Option {
return func(o *server.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, netListener{}, l)
}
}
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// Options to be used to configure gRPC options
func Options(opts ...grpc.ServerOption) server.Option {
return func(o *server.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, grpcOptions{}, opts)
}
}
//
// MaxMsgSize set the maximum message in bytes the server can receive and
// send. Default maximum message size is 4 MB.
//
func MaxMsgSize(s int) server.Option {
return func(o *server.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, maxMsgSizeKey{}, s)
}
}
func newOptions(opt ...server.Option) server.Options {
opts := server.Options{
Codecs: make(map[string]codec.NewCodec),
Metadata: map[string]string{},
}
for _, o := range opt {
o(&opts)
}
if opts.Broker == nil {
opts.Broker = broker.DefaultBroker
}
if opts.Registry == nil {
opts.Registry = registry.DefaultRegistry
}
if opts.Transport == nil {
opts.Transport = transport.DefaultTransport
}
if len(opts.Address) == 0 {
opts.Address = server.DefaultAddress
}
if len(opts.Name) == 0 {
opts.Name = server.DefaultName
}
if len(opts.Id) == 0 {
opts.Id = server.DefaultId
}
if len(opts.Version) == 0 {
opts.Version = server.DefaultVersion
}
return opts
}