b19583e7d3
This is an initial implementation of the mgmt language. It is a declarative (immutable) functional, reactive, domain specific programming language. It is intended to be a language that is: * safe * powerful * easy to reason about With these properties, we hope this language, and the mgmt engine will allow you to model the real-time systems that you'd like to automate. This also includes a number of other associated changes. Sorry for the large size of this patch.
95 lines
3.0 KiB
Go
95 lines
3.0 KiB
Go
// Mgmt
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// Copyright (C) 2013-2018+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package etcd
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import (
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"time"
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etcd "github.com/coreos/etcd/clientv3" // "clientv3"
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errwrap "github.com/pkg/errors"
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context "golang.org/x/net/context"
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)
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// ClientEtcd provides a simple etcd client for deploy and status operations.
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type ClientEtcd struct {
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Seeds []string // list of endpoints to try to connect
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client *etcd.Client
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}
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// GetClient returns a handle to the raw etcd client object.
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func (obj *ClientEtcd) GetClient() *etcd.Client {
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return obj.client
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}
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// GetConfig returns the config struct to be used for the etcd client connect.
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func (obj *ClientEtcd) GetConfig() etcd.Config {
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cfg := etcd.Config{
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Endpoints: obj.Seeds,
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// RetryDialer chooses the next endpoint to use
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// it comes with a default dialer if unspecified
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DialTimeout: 5 * time.Second,
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}
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return cfg
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}
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// Connect connects the client to a server, and then builds the *API structs.
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// If reconnect is true, it will force a reconnect with new config endpoints.
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func (obj *ClientEtcd) Connect() error {
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if obj.client != nil { // memoize
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return nil
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}
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var err error
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cfg := obj.GetConfig()
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obj.client, err = etcd.New(cfg) // connect!
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if err != nil {
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return errwrap.Wrapf(err, "client connect error")
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}
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return nil
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}
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// Destroy cleans up the entire etcd client connection.
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func (obj *ClientEtcd) Destroy() error {
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err := obj.client.Close()
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//obj.wg.Wait()
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return err
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}
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// Get runs a get on the client connection. This has the same signature as our
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// EmbdEtcd Get function.
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func (obj *ClientEtcd) Get(path string, opts ...etcd.OpOption) (map[string]string, error) {
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resp, err := obj.client.Get(context.TODO(), path, opts...)
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if err != nil || resp == nil {
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return nil, err
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}
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// TODO: write a resp.ToMap() function on https://godoc.org/github.com/coreos/etcd/etcdserver/etcdserverpb#RangeResponse
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result := make(map[string]string)
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for _, x := range resp.Kvs {
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result[string(x.Key)] = string(x.Value)
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}
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return result, nil
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}
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// Txn runs a transaction on the client connection. This has the same signature
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// as our EmbdEtcd Txn function.
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func (obj *ClientEtcd) Txn(ifcmps []etcd.Cmp, thenops, elseops []etcd.Op) (*etcd.TxnResponse, error) {
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return obj.client.KV.Txn(context.TODO()).If(ifcmps...).Then(thenops...).Else(elseops...).Commit()
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}
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