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113 lines
2.4 KiB
113 lines
2.4 KiB
package etcd
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import (
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"context"
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"fmt"
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"log"
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"gitoa.ru/go-4devs/config"
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"gitoa.ru/go-4devs/config/key"
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"gitoa.ru/go-4devs/config/value"
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pb "go.etcd.io/etcd/api/v3/mvccpb"
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client "go.etcd.io/etcd/client/v3"
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)
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var (
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_ config.Provider = (*Provider)(nil)
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_ config.WatchProvider = (*Provider)(nil)
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)
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type Client interface {
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client.KV
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client.Watcher
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}
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func NewProvider(client Client) *Provider {
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p := Provider{
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client: client,
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key: key.NsAppName("/"),
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}
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return &p
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}
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type Provider struct {
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client Client
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key config.KeyFactory
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}
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func (p *Provider) IsSupport(ctx context.Context, key config.Key) bool {
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return p.key(ctx, key) != ""
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}
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func (p *Provider) Name() string {
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return "etcd"
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}
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func (p *Provider) Read(ctx context.Context, key config.Key) (config.Variable, error) {
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k := p.key(ctx, key)
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resp, err := p.client.Get(ctx, k, client.WithPrefix())
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if err != nil {
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return config.Variable{}, fmt.Errorf("%w: key:%s, prov:%s", err, k, p.Name())
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}
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val, err := p.resolve(k, resp.Kvs)
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if err != nil {
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return config.Variable{}, fmt.Errorf("%w: key:%s, prov:%s", err, k, p.Name())
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}
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return val, nil
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}
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func (p *Provider) Watch(ctx context.Context, key config.Key, callback config.WatchCallback) error {
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go func(ctx context.Context, key string, callback config.WatchCallback) {
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watch := p.client.Watch(ctx, key, client.WithPrevKV(), client.WithPrefix())
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for w := range watch {
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kvs, olds := p.getEventKvs(w.Events)
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if len(kvs) > 0 {
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newVar, _ := p.resolve(key, kvs)
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oldVar, _ := p.resolve(key, olds)
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callback(ctx, oldVar, newVar)
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}
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}
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}(ctx, p.key(ctx, key), callback)
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return nil
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}
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func (p *Provider) getEventKvs(events []*client.Event) ([]*pb.KeyValue, []*pb.KeyValue) {
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kvs := make([]*pb.KeyValue, 0, len(events))
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old := make([]*pb.KeyValue, 0, len(events))
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for i := range events {
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kvs = append(kvs, events[i].Kv)
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old = append(old, events[i].PrevKv)
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log.Println(events[i].Type)
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}
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return kvs, old
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}
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func (p *Provider) resolve(key string, kvs []*pb.KeyValue) (config.Variable, error) {
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for _, kv := range kvs {
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switch {
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case kv == nil:
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return config.Variable{
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Name: key,
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Provider: p.Name(),
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}, nil
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case string(kv.Key) == key:
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return config.Variable{
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Value: value.JBytes(kv.Value),
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Name: key,
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Provider: p.Name(),
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}, nil
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}
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}
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return config.Variable{
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Name: key,
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Provider: p.Name(),
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}, config.ErrVariableNotFound
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}
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