/
client.go
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/
client.go
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// Copyright 2022 Aspect Build Systems, Inc. All rights reserved.
//
// Original authors: Thulio Ferraz Assis (thulio@aspect.dev)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// GENERATED FILE - DO NOT EDIT!
package client
import (
"context"
"fmt"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/balancer/roundrobin"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/keepalive"
"google.golang.org/grpc/resolver"
pb "github.com/aspect-build/talkie/examples/helloworld/protos"
)
// Greeter wraps a pb.GreeterClient by offering the
// Connect and Disconnect methods.
type Greeter interface {
Connect(ctx context.Context, serverAddr string, extraOpts ...grpc.DialOption) error
Client() pb.GreeterClient
Disconnect() error
}
// NewGreeter constructs a Greeter.
func NewGreeter(loadBalance bool) Greeter {
return &greeter{
loadBalance: loadBalance,
}
}
type greeter struct {
conn *grpc.ClientConn
client pb.GreeterClient
loadBalance bool
}
var defaultOptions = []grpc.DialOption{
// TODO(f0rmiga): do proper mTLS.
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: time.Second * 10,
Timeout: time.Second * 3,
PermitWithoutStream: true,
}),
}
// Connect connects to the Greeter service.
func (c *greeter) Connect(ctx context.Context, serverAddr string, extraOpts ...grpc.DialOption) error {
opts := append(defaultOptions, extraOpts...)
if c.loadBalance {
opts = append(opts, grpc.WithDefaultServiceConfig(fmt.Sprintf(`{"loadBalancingPolicy":"%s"}`, roundrobin.Name)))
resolver.SetDefaultScheme("dns")
}
conn, err := grpc.DialContext(ctx, serverAddr, opts...)
if err != nil {
return fmt.Errorf("failed to connect to Greeter: %w", err)
}
c.client = pb.NewGreeterClient(conn)
c.conn = conn
return nil
}
// Client returns the connected client for Greeter.
func (c *greeter) Client() pb.GreeterClient {
return c.client
}
// Disconnect disconnects the client from the Greeter service.
func (c *greeter) Disconnect() error {
if err := c.conn.Close(); err != nil {
return fmt.Errorf("failed to close connection to Greeter: %w", err)
}
return nil
}