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remove etcd source

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This commit is contained in:
Asim Aslam 2019-06-11 09:53:06 +01:00
parent d030c78d1c
commit aec1ca6635
5 changed files with 0 additions and 464 deletions
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51
config/source/etcd/README.md
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@ -1,51 +0,0 @@
# Etcd Source
The etcd source reads config from etcd key/values
This source supports etcd version 3 and beyond.
## Etcd Format
The etcd source expects keys under the default prefix `/micro/config` (prefix can be changed)
Values are expected to be JSON
```
// set database
etcdctl put /micro/config/database '{"address": "10.0.0.1", "port": 3306}'
// set cache
etcdctl put /micro/config/cache '{"address": "10.0.0.2", "port": 6379}'
```
Keys are split on `/` so access becomes
```
conf.Get("micro", "config", "database")
```
## New Source
Specify source with data
```go
etcdSource := etcd.NewSource(
// optionally specify etcd address; default to localhost:8500
etcd.WithAddress("10.0.0.10:8500"),
// optionally specify prefix; defaults to /micro/config
etcd.WithPrefix("/my/prefix"),
// optionally strip the provided prefix from the keys, defaults to false
etcd.StripPrefix(true),
)
```
## Load Source
Load the source into config
```go
// Create new config
conf := config.NewConfig()
// Load file source
conf.Load(etcdSource)
```

141
config/source/etcd/etcd.go
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@ -1,141 +0,0 @@
package etcd
import (
"context"
"fmt"
"net"
"time"
cetcd "github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/micro/go-micro/config/source"
)
// Currently a single etcd reader
type etcd struct {
prefix string
stripPrefix string
opts source.Options
client *cetcd.Client
cerr error
}
var (
DefaultPrefix = "/micro/config/"
)
func (c *etcd) Read() (*source.ChangeSet, error) {
if c.cerr != nil {
return nil, c.cerr
}
rsp, err := c.client.Get(context.Background(), c.prefix, cetcd.WithPrefix())
if err != nil {
return nil, err
}
if rsp == nil || len(rsp.Kvs) == 0 {
return nil, fmt.Errorf("source not found: %s", c.prefix)
}
var kvs []*mvccpb.KeyValue
for _, v := range rsp.Kvs {
kvs = append(kvs, (*mvccpb.KeyValue)(v))
}
data := makeMap(c.opts.Encoder, kvs, c.stripPrefix)
b, err := c.opts.Encoder.Encode(data)
if err != nil {
return nil, fmt.Errorf("error reading source: %v", err)
}
cs := &source.ChangeSet{
Timestamp: time.Now(),
Source: c.String(),
Data: b,
Format: c.opts.Encoder.String(),
}
cs.Checksum = cs.Sum()
return cs, nil
}
func (c *etcd) String() string {
return "etcd"
}
func (c *etcd) Watch() (source.Watcher, error) {
if c.cerr != nil {
return nil, c.cerr
}
cs, err := c.Read()
if err != nil {
return nil, err
}
return newWatcher(c.prefix, c.stripPrefix, c.client.Watcher, cs, c.opts)
}
func NewSource(opts ...source.Option) source.Source {
options := source.NewOptions(opts...)
var endpoints []string
// check if there are any addrs
addrs, ok := options.Context.Value(addressKey{}).([]string)
if ok {
for _, a := range addrs {
addr, port, err := net.SplitHostPort(a)
if ae, ok := err.(*net.AddrError); ok && ae.Err == "missing port in address" {
port = "2379"
addr = a
endpoints = append(endpoints, fmt.Sprintf("%s:%s", addr, port))
} else if err == nil {
endpoints = append(endpoints, fmt.Sprintf("%s:%s", addr, port))
}
}
}
if len(endpoints) == 0 {
endpoints = []string{"localhost:2379"}
}
// check dial timeout option
dialTimeout, ok := options.Context.Value(dialTimeoutKey{}).(time.Duration)
if !ok {
dialTimeout = 3 * time.Second // default dial timeout
}
config := cetcd.Config{
Endpoints: endpoints,
DialTimeout: dialTimeout,
}
u, ok := options.Context.Value(authKey{}).(*authCreds)
if ok {
config.Username = u.Username
config.Password = u.Password
}
// use default config
client, err := cetcd.New(config)
prefix := DefaultPrefix
sp := ""
f, ok := options.Context.Value(prefixKey{}).(string)
if ok {
prefix = f
}
if b, ok := options.Context.Value(stripPrefixKey{}).(bool); ok && b {
sp = prefix
}
return &etcd{
prefix: prefix,
stripPrefix: sp,
opts: options,
client: client,
cerr: err,
}
}

70
config/source/etcd/options.go
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@ -1,70 +0,0 @@
package etcd
import (
"context"
"time"
"github.com/micro/go-micro/config/source"
)
type addressKey struct{}
type prefixKey struct{}
type stripPrefixKey struct{}
type authKey struct{}
type dialTimeoutKey struct{}
type authCreds struct {
Username string
Password string
}
// WithAddress sets the etcd address
func WithAddress(a ...string) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, addressKey{}, a)
}
}
// WithPrefix sets the key prefix to use
func WithPrefix(p string) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, prefixKey{}, p)
}
}
// StripPrefix indicates whether to remove the prefix from config entries, or leave it in place.
func StripPrefix(strip bool) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, stripPrefixKey{}, strip)
}
}
// Auth allows you to specify username/password
func Auth(username, password string) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, authKey{}, &authCreds{Username: username, Password: password})
}
}
// WithDialTimeout set the time out for dialing to etcd
func WithDialTimeout(timeout time.Duration) source.Option {
return func(o *source.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, dialTimeoutKey{}, timeout)
}
}

89
config/source/etcd/util.go
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@ -1,89 +0,0 @@
package etcd
import (
"strings"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/micro/go-micro/config/encoder"
)
func makeEvMap(e encoder.Encoder, data map[string]interface{}, kv []*clientv3.Event, stripPrefix string) map[string]interface{} {
if data == nil {
data = make(map[string]interface{})
}
for _, v := range kv {
switch mvccpb.Event_EventType(v.Type) {
case mvccpb.DELETE:
data = update(e, data, (*mvccpb.KeyValue)(v.Kv), "delete", stripPrefix)
default:
data = update(e, data, (*mvccpb.KeyValue)(v.Kv), "insert", stripPrefix)
}
}
return data
}
func makeMap(e encoder.Encoder, kv []*mvccpb.KeyValue, stripPrefix string) map[string]interface{} {
data := make(map[string]interface{})
for _, v := range kv {
data = update(e, data, v, "put", stripPrefix)
}
return data
}
func update(e encoder.Encoder, data map[string]interface{}, v *mvccpb.KeyValue, action, stripPrefix string) map[string]interface{} {
// remove prefix if non empty, and ensure leading / is removed as well
vkey := strings.TrimPrefix(strings.TrimPrefix(string(v.Key), stripPrefix), "/")
// split on prefix
haveSplit := strings.Contains(vkey, "/")
keys := strings.Split(vkey, "/")
var vals interface{}
e.Decode(v.Value, &vals)
if !haveSplit && len(keys) == 1 {
switch action {
case "delete":
data = make(map[string]interface{})
default:
v, ok := vals.(map[string]interface{})
if ok {
data = v
}
}
return data
}
// set data for first iteration
kvals := data
// iterate the keys and make maps
for i, k := range keys {
kval, ok := kvals[k].(map[string]interface{})
if !ok {
// create next map
kval = make(map[string]interface{})
// set it
kvals[k] = kval
}
// last key: write vals
if l := len(keys) - 1; i == l {
switch action {
case "delete":
delete(kvals, k)
default:
kvals[k] = vals
}
break
}
// set kvals for next iterator
kvals = kval
}
return data
}

113
config/source/etcd/watcher.go
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@ -1,113 +0,0 @@
package etcd
import (
"context"
"errors"
"sync"
"time"
cetcd "github.com/coreos/etcd/clientv3"
"github.com/micro/go-micro/config/source"
)
type watcher struct {
opts source.Options
name string
stripPrefix string
sync.RWMutex
cs *source.ChangeSet
ch chan *source.ChangeSet
exit chan bool
}
func newWatcher(key, strip string, wc cetcd.Watcher, cs *source.ChangeSet, opts source.Options) (source.Watcher, error) {
w := &watcher{
opts: opts,
name: "etcd",
stripPrefix: strip,
cs: cs,
ch: make(chan *source.ChangeSet),
exit: make(chan bool),
}
ch := wc.Watch(context.Background(), key, cetcd.WithPrefix())
go w.run(wc, ch)
return w, nil
}
func (w *watcher) handle(evs []*cetcd.Event) {
w.RLock()
data := w.cs.Data
w.RUnlock()
var vals map[string]interface{}
// unpackage existing changeset
if err := w.opts.Encoder.Decode(data, &vals); err != nil {
return
}
// update base changeset
d := makeEvMap(w.opts.Encoder, vals, evs, w.stripPrefix)
// pack the changeset
b, err := w.opts.Encoder.Encode(d)
if err != nil {
return
}
// create new changeset
cs := &source.ChangeSet{
Timestamp: time.Now(),
Source: w.name,
Data: b,
Format: w.opts.Encoder.String(),
}
cs.Checksum = cs.Sum()
// set base change set
w.Lock()
w.cs = cs
w.Unlock()
// send update
w.ch <- cs
}
func (w *watcher) run(wc cetcd.Watcher, ch cetcd.WatchChan) {
for {
select {
case rsp, ok := <-ch:
if !ok {
return
}
w.handle(rsp.Events)
case <-w.exit:
wc.Close()
return
}
}
}
func (w *watcher) Next() (*source.ChangeSet, error) {
select {
case cs := <-w.ch:
return cs, nil
case <-w.exit:
return nil, errors.New("watcher stopped")
}
}
func (w *watcher) Stop() error {
select {
case <-w.exit:
return nil
default:
close(w.exit)
}
return nil
}