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builder.go
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builder.go
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/*
Copyright © 2017 Henry Huang <hhh@rutcode.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package etcdnaming
import (
"time"
"go.etcd.io/etcd/clientv3"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/resolver"
)
const (
schema = "etcdnaming"
// DialTarget 访问目标
DialTarget = schema + ":///"
)
type etcdBuilder struct {
opts BuilderOptions
}
type etcdResolver struct {
opts BuilderOptions
// grpc conn
client *clientv3.Client
ctx context.Context
cancel context.CancelFunc
cc resolver.ClientConn
target resolver.Target
key string
rn chan struct{}
}
// BuilderOptions builder's configure
type BuilderOptions struct {
Server string
Version string
Endpoint string
LooperTime time.Duration
}
// NewBuilder 获取builder
func NewBuilder(opt BuilderOptions) {
b := &etcdBuilder{
opts: opt,
}
resolver.Register(b)
}
func (p *etcdBuilder) Scheme() string {
return schema
}
// Dial 拨号
func Dial(opts ...grpc.DialOption) (*grpc.ClientConn, error) {
return DialContext(context.Background(), opts...)
}
// DialContext 带上下文的拨号
func DialContext(ctx context.Context, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
c, err := grpc.DialContext(ctx, DialTarget, opts...)
if err != nil {
return nil, err
}
return c, nil
}