watcher send changes only on non nil

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

.github/renovate.json

@@ -0,0 +1,19 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true
+    },
+    {
+      "groupName": "all deps",
+      "separateMajorMinor": true,
+      "groupSlug": "all",
+      "packagePatterns": [
+        "*"
+      ]
+    }
+  ]
+}

.github/workflows/build.yml

@@ -9,9 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
     - name: checkout
       uses: actions/checkout@v2
     - name: cache
@@ -33,7 +33,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v2
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v2
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/pr.yml

@@ -9,9 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: setup
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v2
       with:
-        go-version: 1.15
+        go-version: 1.16
     - name: checkout
       uses: actions/checkout@v2
     - name: cache
@@ -33,7 +33,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v2
       - name: lint
-        uses: golangci/golangci-lint-action@v1
+        uses: golangci/golangci-lint-action@v2
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

consul.go

@@ -2,18 +2,18 @@ package consul
 
 import (
 	"context"
-	"errors"
 	"fmt"
+	"reflect"
 
 	"github.com/hashicorp/consul/api"
 	"github.com/imdario/mergo"
 	"github.com/unistack-org/micro/v3/config"
+	"github.com/unistack-org/micro/v3/util/jitter"
 	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
 var (
 	DefaultStructTag = "consul"
-	ErrPathNotExist  = errors.New("path is not exist")
 )
 
 type consulConfig struct {
@@ -72,7 +72,7 @@ func (c *consulConfig) Init(opts ...config.Option) error {
 	}
 
 	cli, err := api.NewClient(cfg)
-	if err != nil {
+	if err != nil && !c.opts.AllowFail {
 		return err
 	}
 
@@ -82,7 +82,7 @@ func (c *consulConfig) Init(opts ...config.Option) error {
 	return nil
 }
 
-func (c *consulConfig) Load(ctx context.Context) error {
+func (c *consulConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
 	for _, fn := range c.opts.BeforeLoad {
 		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
@@ -91,17 +91,31 @@ func (c *consulConfig) Load(ctx context.Context) error {
 
 	pair, _, err := c.cli.KV().Get(c.path, nil)
 	if err != nil && !c.opts.AllowFail {
-		return fmt.Errorf("consul path load error: %v", err)
+		return fmt.Errorf("consul path %s load error: %v", c.path, err)
 	} else if pair == nil && !c.opts.AllowFail {
-		return fmt.Errorf("consul path not found %v", ErrPathNotExist)
+		return fmt.Errorf("consul path %s not found", c.path)
 	}
 
 	if err == nil && pair != nil {
-		src, err := rutil.Zero(c.opts.Struct)
+		options := config.NewLoadOptions(opts...)
+		mopts := []func(*mergo.Config){mergo.WithTypeCheck}
+		if options.Override {
+			mopts = append(mopts, mergo.WithOverride)
+		}
+		if options.Append {
+			mopts = append(mopts, mergo.WithAppendSlice)
+		}
+
+		dst := c.opts.Struct
+		if options.Struct != nil {
+			dst = options.Struct
+		}
+
+		src, err := rutil.Zero(dst)
 		if err == nil {
 			err = c.opts.Codec.Unmarshal(pair.Value, src)
 			if err == nil {
-				err = mergo.Merge(c.opts.Struct, src, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice)
+				err = mergo.Merge(dst, src, mopts...)
 			}
 		}
 
@@ -120,13 +134,22 @@ func (c *consulConfig) Load(ctx context.Context) error {
 	return nil
 }
 
-func (c *consulConfig) Save(ctx context.Context) error {
+func (c *consulConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
 	for _, fn := range c.opts.BeforeSave {
 		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
 		}
 	}
 
+	buf, err := c.opts.Codec.Marshal(c.opts.Struct)
+	if err == nil {
+		_, err = c.cli.KV().Put(&api.KVPair{Key: c.path, Value: buf}, nil)
+	}
+
+	if err != nil && !c.opts.AllowFail {
+		return fmt.Errorf("consul path %s save error: %v", c.path, err)
+	}
+
 	for _, fn := range c.opts.AfterSave {
 		if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
 			return err
@@ -144,6 +167,114 @@ func (c *consulConfig) Name() string {
 	return c.opts.Name
 }
 
+func (c *consulConfig) Watch(ctx context.Context, opts ...config.WatchOption) (config.Watcher, error) {
+	w := &consulWatcher{
+		cli:   c.cli,
+		path:  c.path,
+		opts:  c.opts,
+		wopts: config.NewWatchOptions(opts...),
+		done:  make(chan struct{}),
+		vchan: make(chan map[string]interface{}),
+		echan: make(chan error),
+	}
+
+	go w.run()
+
+	return w, nil
+}
+
+type consulWatcher struct {
+	cli   *api.Client
+	path  string
+	opts  config.Options
+	wopts config.WatchOptions
+	done  chan struct{}
+	vchan chan map[string]interface{}
+	echan chan error
+}
+
+func (w *consulWatcher) run() {
+	ticker := jitter.NewTicker(w.wopts.MinInterval, w.wopts.MaxInterval)
+	defer ticker.Stop()
+
+	src := w.opts.Struct
+	if w.wopts.Struct != nil {
+		src = w.wopts.Struct
+	}
+
+	for {
+		select {
+		case <-w.done:
+			return
+		case <-ticker.C:
+			dst, err := rutil.Zero(src)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+
+			pair, _, err := w.cli.KV().Get(w.path, nil)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+
+			if pair == nil {
+				w.echan <- fmt.Errorf("consul path %s not found", w.path)
+				return
+			}
+
+			err = w.opts.Codec.Unmarshal(pair.Value, dst)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+
+			srcmp, err := rutil.StructFieldsMap(src)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+
+			dstmp, err := rutil.StructFieldsMap(dst)
+			if err != nil {
+				w.echan <- err
+				return
+			}
+
+			for sk, sv := range srcmp {
+				if reflect.DeepEqual(dstmp[sk], sv) {
+					delete(dstmp, sk)
+				}
+			}
+			if len(dstmp) > 0 {
+				w.vchan <- dstmp
+				src = dst
+			}
+		}
+	}
+}
+
+func (w *consulWatcher) Next() (map[string]interface{}, error) {
+	select {
+	case <-w.done:
+		break
+	case err := <-w.echan:
+		return nil, err
+	case v, ok := <-w.vchan:
+		if !ok {
+			break
+		}
+		return v, nil
+	}
+	return nil, config.ErrWatcherStopped
+}
+
+func (w *consulWatcher) Stop() error {
+	close(w.done)
+	return nil
+}
+
 func NewConfig(opts ...config.Option) config.Config {
 	options := config.NewOptions(opts...)
 	if len(options.StructTag) == 0 {

go.mod

@@ -1,13 +1,13 @@
 module github.com/unistack-org/micro-config-consul/v3
 
-go 1.15
+go 1.16
 
 require (
 	github.com/google/btree v1.0.0 // indirect
-	github.com/hashicorp/consul/api v1.8.0
+	github.com/hashicorp/consul/api v1.8.1
-	github.com/hashicorp/go-hclog v0.15.0
+	github.com/hashicorp/go-hclog v0.16.1
 	github.com/hashicorp/golang-lru v0.5.3 // indirect
-	github.com/imdario/mergo v0.3.11
+	github.com/imdario/mergo v0.3.12
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/unistack-org/micro/v3 v3.2.4
+	github.com/unistack-org/micro/v3 v3.5.8
 )

go.sum

@@ -1,61 +1,32 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
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 github.com/hashicorp/go-msgpack v0.5.3 h1:zKjpN5BK/P5lMYrLmBHdBULWbJ0XpYR+7NGzqkZzoD4=
@@ -80,13 +51,11 @@ github.com/hashicorp/memberlist v0.2.2 h1:5+RffWKwqJ71YPu9mWsF7ZOscZmwfasdA8kbdC
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@@ -98,9 +67,8 @@ github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOA
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@@ -109,12 +77,9 @@ github.com/mitchellh/go-testing-interface v1.0.0/go.mod h1:kRemZodwjscx+RGhAo8eI
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@@ -122,52 +87,32 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
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options.go

@@ -1,6 +1,8 @@
 package consul
 
 import (
+	"time"
+
 	"github.com/hashicorp/consul/api"
 	"github.com/unistack-org/micro/v3/config"
 )
@@ -36,3 +38,9 @@ func TLSConfig(t *tls.Config) config.Option {
 	return config.SetOption(tlsConfigKey{}, t)
 }
 */
+
+type timeoutKey struct{}
+
+func Timeout(td time.Duration) config.Option {
+	return config.SetOption(timeoutKey{}, td)
+}