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// Copyright 2016 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package clientv3
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import (
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"github.com/coreos/etcd/Godeps/_workspace/src/google.golang.org/grpc"
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pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
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)
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type Client struct {
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// KV is the keyvalue API for the client's connection.
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KV pb.KVClient
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// Lease is the lease API for the client's connection.
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Lease pb.LeaseClient
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// Watch is the watch API for the client's connection.
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Watch pb.WatchClient
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// Cluster is the cluster API for the client's connection.
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Cluster pb.ClusterClient
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conn *grpc.ClientConn
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cfg Config
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}
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type Config struct {
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// Endpoints is a list of URLs
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Endpoints []string
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// TODO TLS options
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}
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// New creates a new etcdv3 client from a given configuration.
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func New(cfg Config) (*Client, error) {
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conn, err := cfg.dialEndpoints()
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if err != nil {
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return nil, err
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}
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client := newClient(conn)
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client.cfg = cfg
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return client, nil
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}
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// NewFromURL creates a new etcdv3 client from a URL.
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func NewFromURL(url string) (*Client, error) {
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return New(Config{Endpoints: []string{url}})
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}
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// NewFromConn creates a new etcdv3 client from an established grpc Connection.
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func NewFromConn(conn *grpc.ClientConn) *Client {
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return newClient(conn)
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}
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// Clone creates a copy of client with the old connection and new API clients.
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func (c *Client) Clone() *Client {
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cl := newClient(c.conn)
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cl.cfg = c.cfg
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return cl
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}
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// Close shuts down the client's etcd connections.
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func (c *Client) Close() error {
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return c.conn.Close()
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}
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func newClient(conn *grpc.ClientConn) *Client {
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return &Client{
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KV: pb.NewKVClient(conn),
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Lease: pb.NewLeaseClient(conn),
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Watch: pb.NewWatchClient(conn),
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Cluster: pb.NewClusterClient(conn),
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conn: conn,
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}
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}
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func (cfg *Config) dialEndpoints() (*grpc.ClientConn, error) {
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var err error
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for _, ep := range cfg.Endpoints {
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// TODO: enable grpc.WithTransportCredentials(creds)
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conn, curErr := grpc.Dial(ep, grpc.WithInsecure())
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if err != nil {
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err = curErr
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} else {
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return conn, nil
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}
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}
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return nil, err
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}
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