feat: add revision number to proxy and layers to identify changes

doc/README.md

@@ -12,7 +12,7 @@
 
 - [(FR) - Layers](./fr/references/layers/README.md)
 - [(FR) - Métriques](./fr/references/metrics.md)
-- [(FR) - Fichier de configuration](../misc/packaging/common/config.yml)
+- [(FR) - Configuration](./fr/references/configuration.md)
 - [(FR) - API d'administration](./fr/references/admin_api.md)
 
 ## Tutoriels
@@ -29,3 +29,4 @@
 
 - [(FR) - Démarrer avec les sources](./fr/tutorials/getting-started-with-sources.md)
 - [(FR) - Créer son propre layer](./fr/tutorials/create-custom-layer.md)
+- [(FR) - Étudier les performances de Bouncer](./fr/tutorials/profiling.md)

doc/fr/references/configuration.md

@@ -0,0 +1,34 @@
+# Configuration
+
+## Référence
+
+Vous trouverez ici un fichier de configuration de référence, complet et commenté:
+
+[`misc/packaging/common/config.yml`](../../../misc/packaging/common/config.yml)
+
+## Interpolation de variables
+
+Il est possible d'utiliser de l'interpolation de variables d'environnement dans le fichier de configuration via la syntaxe `${var}`.
+
+Les fonctions d'interpolation suivantes sont également disponibles:
+
+- `${var^}`
+- `${var^^}`
+- `${var,}`
+- `${var,,}`
+- `${var:position}`
+- `${var:position:length}`
+- `${var#substring}`
+- `${var##substring}`
+- `${var%substring}`
+- `${var%%substring}`
+- `${var/substring/replacement}`
+- `${var//substring/replacement}`
+- `${var/#substring/replacement}`
+- `${var/%substring/replacement}`
+- `${#var}`
+- `${var=default}`
+- `${var:=default}`
+- `${var:-default}`
+
+_Voir le package [`github.com/drone/envsubst`](https://pkg.go.dev/github.com/drone/envsubst) pour plus de détails._

doc/fr/tutorials/profiling.md

@@ -1,4 +1,4 @@
-# Analyser les performances de Bouncer
+# Étudier les performances de Bouncer
 
 1. Lancer un benchmark du proxy
 

internal/command/admin/layer/util.go

@@ -13,6 +13,7 @@ func layerHeaderHints(outputMode format.OutputMode) format.Hints {
 			format.NewProp("Type", "Type"),
 			format.NewProp("Enabled", "Enabled"),
 			format.NewProp("Weight", "Weight"),
+			format.NewProp("Revision", "Revision"),
 		},
 	}
 }
@@ -25,6 +26,7 @@ func layerHints(outputMode format.OutputMode) format.Hints {
 			format.NewProp("Type", "Type"),
 			format.NewProp("Enabled", "Enabled"),
 			format.NewProp("Weight", "Weight"),
+			format.NewProp("Revision", "Revision"),
 			format.NewProp("Options", "Options"),
 			format.NewProp("CreatedAt", "CreatedAt", table.WithCompactModeMaxColumnWidth(20)),
 			format.NewProp("UpdatedAt", "UpdatedAt", table.WithCompactModeMaxColumnWidth(20)),

internal/command/admin/proxy/util.go

@@ -12,6 +12,7 @@ func proxyHeaderHints(outputMode format.OutputMode) format.Hints {
 			format.NewProp("Name", "Name"),
 			format.NewProp("Enabled", "Enabled"),
 			format.NewProp("Weight", "Weight"),
+			format.NewProp("Revision", "Revision"),
 		},
 	}
 }
@@ -25,6 +26,7 @@ func proxyHints(outputMode format.OutputMode) format.Hints {
 			format.NewProp("To", "To"),
 			format.NewProp("Enabled", "Enabled"),
 			format.NewProp("Weight", "Weight"),
+			format.NewProp("Revision", "Revision"),
 			format.NewProp("CreatedAt", "CreatedAt", table.WithCompactModeMaxColumnWidth(20)),
 			format.NewProp("UpdatedAt", "UpdatedAt", table.WithCompactModeMaxColumnWidth(20)),
 		},

internal/config/environment.go

@@ -2,7 +2,6 @@ package config
 
 import (
 	"os"
-	"regexp"
 	"strconv"
 	"time"
 
@@ -11,9 +10,6 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
-// var reVar = regexp.MustCompile(`^\${(\w+)}$`)
-var reVar = regexp.MustCompile(`\${(.*?)}`)
-
 type InterpolatedString string
 
 func (is *InterpolatedString) UnmarshalYAML(value *yaml.Node) error {
@@ -23,12 +19,13 @@ func (is *InterpolatedString) UnmarshalYAML(value *yaml.Node) error {
 		return errors.WithStack(err)
 	}
 
-	if match := reVar.FindStringSubmatch(str); len(match) > 0 {
+	str, err := envsubst.EvalEnv(str)
-		*is = InterpolatedString(os.Getenv(match[1]))
+	if err != nil {
-	} else {
+		return errors.WithStack(err)
-		*is = InterpolatedString(str)
 	}
 
+	*is = InterpolatedString(str)
+
 	return nil
 }
 
@@ -41,8 +38,9 @@ func (ii *InterpolatedInt) UnmarshalYAML(value *yaml.Node) error {
 		return errors.Wrapf(err, "could not decode value '%v' (line '%d') into string", value.Value, value.Line)
 	}
 
-	if match := reVar.FindStringSubmatch(str); len(match) > 0 {
+	str, err := envsubst.EvalEnv(str)
-		str = os.Getenv(match[1])
+	if err != nil {
+		return errors.WithStack(err)
 	}
 
 	intVal, err := strconv.ParseInt(str, 10, 32)
@@ -64,11 +62,12 @@ func (ifl *InterpolatedFloat) UnmarshalYAML(value *yaml.Node) error {
 		return errors.Wrapf(err, "could not decode value '%v' (line '%d') into string", value.Value, value.Line)
 	}
 
-	if match := reVar.FindStringSubmatch(str); len(match) > 0 {
+	str, err := envsubst.EvalEnv(str)
-		str = os.Getenv(match[1])
+	if err != nil {
+		return errors.WithStack(err)
 	}
 
-	floatVal, err := strconv.ParseFloat(str, 10)
+	floatVal, err := strconv.ParseFloat(str, 32)
 	if err != nil {
 		return errors.Wrapf(err, "could not parse float '%v',  line '%d'", str, value.Line)
 	}
@@ -87,8 +86,9 @@ func (ib *InterpolatedBool) UnmarshalYAML(value *yaml.Node) error {
 		return errors.Wrapf(err, "could not decode value '%v' (line '%d') into string", value.Value, value.Line)
 	}
 
-	if match := reVar.FindStringSubmatch(str); len(match) > 0 {
+	str, err := envsubst.EvalEnv(str)
-		str = os.Getenv(match[1])
+	if err != nil {
+		return errors.WithStack(err)
 	}
 
 	boolVal, err := strconv.ParseBool(str)
@@ -165,22 +165,15 @@ type InterpolatedStringSlice []string
 
 func (iss *InterpolatedStringSlice) UnmarshalYAML(value *yaml.Node) error {
 	var data []string
-	var evErr error
 
 	if err := value.Decode(&data); err != nil {
 		return errors.Wrapf(err, "could not decode value '%v' (line '%d') into map", value.Value, value.Line)
 	}
 
 	for index, value := range data {
-		//match := reVar.FindStringSubmatch(value)
+		value, err := envsubst.EvalEnv(value)
-		re := regexp.MustCompile(`\${(.*?)}`)
+		if err != nil {
-
+			return errors.WithStack(err)
-		res := re.FindAllStringSubmatch(value, 10)
-		if len(res) > 0 {
-			value, evErr = envsubst.EvalEnv(value)
-			if evErr != nil {
-				return evErr
-			}
 		}
 
 		data[index] = value
@@ -200,8 +193,9 @@ func (id *InterpolatedDuration) UnmarshalYAML(value *yaml.Node) error {
 		return errors.Wrapf(err, "could not decode value '%v' (line '%d') into string", value.Value, value.Line)
 	}
 
-	if match := reVar.FindStringSubmatch(str); len(match) > 0 {
+	str, err := envsubst.EvalEnv(str)
-		str = os.Getenv(match[1])
+	if err != nil {
+		return errors.WithStack(err)
 	}
 
 	duration, err := time.ParseDuration(str)

internal/proxy/proxy_test.go

@@ -31,8 +31,8 @@ func BenchmarkProxy(b *testing.B) {
 		Addrs: []string{redisEndpoint},
 	})
 
-	proxyRepository := redisStore.NewProxyRepository(client)
+	proxyRepository := redisStore.NewProxyRepository(client, redisStore.DefaultTxMaxAttempts, redisStore.DefaultTxBaseDelay)
-	layerRepository := redisStore.NewLayerRepository(client)
+	layerRepository := redisStore.NewLayerRepository(client, redisStore.DefaultTxMaxAttempts, redisStore.DefaultTxBaseDelay)
 
 	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)

internal/setup/proxy_repository.go

@@ -17,9 +17,9 @@ func NewRedisClient(ctx context.Context, conf config.RedisConfig) redis.Universa
 }
 
 func NewProxyRepository(ctx context.Context, client redis.UniversalClient) (store.ProxyRepository, error) {
-	return redisStore.NewProxyRepository(client), nil
+	return redisStore.NewProxyRepository(client, redisStore.DefaultTxMaxAttempts, redisStore.DefaultTxBaseDelay), nil
 }
 
 func NewLayerRepository(ctx context.Context, client redis.UniversalClient) (store.LayerRepository, error) {
-	return redisStore.NewLayerRepository(client), nil
+	return redisStore.NewLayerRepository(client, redisStore.DefaultTxMaxAttempts, redisStore.DefaultTxBaseDelay), nil
 }

internal/store/layer.go

@@ -11,9 +11,10 @@ type (
 )
 
 type LayerHeader struct {
-	Proxy ProxyName `json:"proxy"`
+	Proxy    ProxyName `json:"proxy"`
-	Name  LayerName `json:"name"`
+	Name     LayerName `json:"name"`
-	Type  LayerType `json:"type"`
+	Revision int       `json:"revision"`
+	Type     LayerType `json:"type"`
 
 	Weight  int  `json:"weight"`
 	Enabled bool `json:"enabled"`

internal/store/proxy.go

@@ -7,10 +7,10 @@ import (
 type ProxyName Name
 
 type ProxyHeader struct {
-	Name ProxyName `json:"name"`
+	Name     ProxyName `json:"name"`
-
+	Revision int       `json:"revision"`
-	Weight  int  `json:"weight"`
+	Weight   int       `json:"weight"`
-	Enabled bool `json:"enabled"`
+	Enabled  bool      `json:"enabled"`
 }
 
 type Proxy struct {

internal/store/redis/helper.go

@@ -3,10 +3,18 @@ package redis
 import (
 	"context"
 	"encoding/json"
+	"math/rand"
 	"strings"
+	"time"
 
 	"github.com/pkg/errors"
 	"github.com/redis/go-redis/v9"
+	"gitlab.com/wpetit/goweb/logger"
+)
+
+var (
+	DefaultTxMaxAttempts = 20
+	DefaultTxBaseDelay   = 100 * time.Millisecond
 )
 
 type jsonWrapper[T any] struct {
@@ -65,6 +73,33 @@ func key(parts ...string) string {
 	return strings.Join(parts, ":")
 }
 
+func WithRetry(ctx context.Context, client redis.UniversalClient, key string, fn func(ctx context.Context, tx *redis.Tx) error, maxAttempts int, baseDelay time.Duration) error {
+	var err error
+
+	delay := baseDelay
+
+	for attempt := 0; attempt < maxAttempts; attempt++ {
+		if err = WithTx(ctx, client, key, fn); err != nil {
+			err = errors.WithStack(err)
+			logger.Debug(ctx, "redis transaction failed", logger.E(err))
+
+			if errors.Is(err, redis.TxFailedErr) {
+				logger.Debug(ctx, "retrying redis transaction", logger.F("attempts", attempt), logger.F("delay", delay))
+				time.Sleep(delay)
+				delay = delay*2 + time.Duration(rand.Int63n(int64(baseDelay)))
+
+				continue
+			}
+
+			return err
+		}
+
+		return nil
+	}
+
+	return errors.WithStack(redis.TxFailedErr)
+}
+
 func WithTx(ctx context.Context, client redis.UniversalClient, key string, fn func(ctx context.Context, tx *redis.Tx) error) error {
 	txf := func(tx *redis.Tx) error {
 		if err := fn(ctx, tx); err != nil {

internal/store/redis/layer_item.go

@@ -8,9 +8,10 @@ import (
 )
 
 type layerHeaderItem struct {
-	Proxy string `redis:"proxy"`
+	Proxy    string `redis:"proxy"`
-	Name  string `redis:"name"`
+	Name     string `redis:"name"`
-	Type  string `redis:"type"`
+	Revision int    `redis:"revision"`
+	Type     string `redis:"type"`
 
 	Weight  int  `redis:"weight"`
 	Enabled bool `redis:"enabled"`
@@ -18,11 +19,12 @@ type layerHeaderItem struct {
 
 func (i *layerHeaderItem) ToLayerHeader() (*store.LayerHeader, error) {
 	layerHeader := &store.LayerHeader{
-		Proxy:   store.ProxyName(i.Proxy),
+		Proxy:    store.ProxyName(i.Proxy),
-		Name:    store.LayerName(i.Name),
+		Name:     store.LayerName(i.Name),
-		Type:    store.LayerType(i.Type),
+		Revision: i.Revision,
-		Weight:  i.Weight,
+		Type:     store.LayerType(i.Type),
-		Enabled: i.Enabled,
+		Weight:   i.Weight,
+		Enabled:  i.Enabled,
 	}
 
 	return layerHeader, nil

internal/store/redis/layer_repository.go

@@ -14,7 +14,9 @@ const (
 )
 
 type LayerRepository struct {
-	client redis.UniversalClient
+	client           redis.UniversalClient
+	txMaxAttempts    int
+	txRetryBaseDelay time.Duration
 }
 
 // CreateLayer implements store.LayerRepository
@@ -24,11 +26,12 @@ func (r *LayerRepository) CreateLayer(ctx context.Context, proxyName store.Proxy
 
 	layerItem := &layerItem{
 		layerHeaderItem: layerHeaderItem{
-			Proxy:   string(proxyName),
+			Proxy:    string(proxyName),
-			Name:    string(layerName),
+			Name:     string(layerName),
-			Type:    string(layerType),
+			Type:     string(layerType),
-			Weight:  0,
+			Weight:   0,
-			Enabled: false,
+			Revision: 0,
+			Enabled:  false,
 		},
 
 		CreatedAt: wrap(now),
@@ -96,7 +99,7 @@ func (r *LayerRepository) GetLayer(ctx context.Context, proxyName store.ProxyNam
 	key := layerKey(proxyName, layerName)
 	var layerItem *layerItem
 
-	err := WithTx(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
+	err := WithRetry(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
 		pItem, err := r.txGetLayerItem(ctx, tx, proxyName, layerName)
 		if err != nil {
 			return errors.WithStack(err)
@@ -105,7 +108,7 @@ func (r *LayerRepository) GetLayer(ctx context.Context, proxyName store.ProxyNam
 		layerItem = pItem
 
 		return nil
-	})
+	}, r.txMaxAttempts, r.txRetryBaseDelay)
 	if err != nil {
 		return nil, errors.WithStack(err)
 	}
@@ -197,7 +200,7 @@ func (r *LayerRepository) UpdateLayer(ctx context.Context, proxyName store.Proxy
 	key := layerKey(proxyName, layerName)
 	var layerItem layerItem
 
-	err := WithTx(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
+	err := WithRetry(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
 		item, err := r.txGetLayerItem(ctx, tx, proxyName, layerName)
 		if err != nil {
 			return errors.WithStack(err)
@@ -216,6 +219,7 @@ func (r *LayerRepository) UpdateLayer(ctx context.Context, proxyName store.Proxy
 		}
 
 		item.UpdatedAt = wrap(time.Now().UTC())
+		item.Revision = item.Revision + 1
 
 		_, err = tx.TxPipelined(ctx, func(p redis.Pipeliner) error {
 			p.HMSet(ctx, key, item.layerHeaderItem)
@@ -230,7 +234,7 @@ func (r *LayerRepository) UpdateLayer(ctx context.Context, proxyName store.Proxy
 		layerItem = *item
 
 		return nil
-	})
+	}, r.txMaxAttempts, r.txRetryBaseDelay)
 	if err != nil {
 		return nil, errors.WithStack(err)
 	}
@@ -243,9 +247,11 @@ func (r *LayerRepository) UpdateLayer(ctx context.Context, proxyName store.Proxy
 	return layer, nil
 }
 
-func NewLayerRepository(client redis.UniversalClient) *LayerRepository {
+func NewLayerRepository(client redis.UniversalClient, txMaxAttempts int, txRetryBaseDelay time.Duration) *LayerRepository {
 	return &LayerRepository{
-		client: client,
+		client:           client,
+		txMaxAttempts:    txMaxAttempts,
+		txRetryBaseDelay: txRetryBaseDelay,
 	}
 }
 

internal/store/redis/layer_repository_test.go

@@ -7,6 +7,6 @@ import (
 )
 
 func TestLayerRepository(t *testing.T) {
-	repository := NewLayerRepository(client)
+	repository := NewLayerRepository(client, DefaultTxMaxAttempts, DefaultTxBaseDelay)
 	testsuite.TestLayerRepository(t, repository)
 }

internal/store/redis/proxy_item.go

@@ -8,7 +8,8 @@ import (
 )
 
 type proxyHeaderItem struct {
-	Name string `redis:"name"`
+	Name     string `redis:"name"`
+	Revision int    `redis:"revision"`
 
 	Weight  int  `redis:"weight"`
 	Enabled bool `redis:"enabled"`
@@ -19,9 +20,10 @@ type proxyHeaderItem struct {
 
 func (i *proxyHeaderItem) ToProxyHeader() (*store.ProxyHeader, error) {
 	proxyHeader := &store.ProxyHeader{
-		Name:    store.ProxyName(i.Name),
+		Name:     store.ProxyName(i.Name),
-		Weight:  i.Weight,
+		Revision: i.Revision,
-		Enabled: i.Enabled,
+		Weight:   i.Weight,
+		Enabled:  i.Enabled,
 	}
 
 	return proxyHeader, nil

internal/store/redis/proxy_repository.go

@@ -14,7 +14,9 @@ const (
 )
 
 type ProxyRepository struct {
-	client redis.UniversalClient
+	client           redis.UniversalClient
+	txMaxAttempts    int
+	txRetryBaseDelay time.Duration
 }
 
 // GetProxy implements store.ProxyRepository
@@ -22,7 +24,7 @@ func (r *ProxyRepository) GetProxy(ctx context.Context, name store.ProxyName) (*
 	key := proxyKey(name)
 	var proxyItem *proxyItem
 
-	err := WithTx(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
+	err := WithRetry(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
 		pItem, err := r.txGetProxyItem(ctx, tx, name)
 		if err != nil {
 			return errors.WithStack(err)
@@ -31,7 +33,7 @@ func (r *ProxyRepository) GetProxy(ctx context.Context, name store.ProxyName) (*
 		proxyItem = pItem
 
 		return nil
-	})
+	}, r.txMaxAttempts, r.txRetryBaseDelay)
 	if err != nil {
 		return nil, errors.WithStack(err)
 	}
@@ -89,6 +91,7 @@ func (r *ProxyRepository) CreateProxy(ctx context.Context, name store.ProxyName,
 				CreatedAt: wrap(now),
 				UpdatedAt: wrap(now),
 				Weight:    0,
+				Revision:  0,
 				Enabled:   false,
 			},
 			To:   to,
@@ -191,7 +194,7 @@ func (r *ProxyRepository) UpdateProxy(ctx context.Context, name store.ProxyName,
 	key := proxyKey(name)
 	var proxyItem proxyItem
 
-	err := WithTx(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
+	err := WithRetry(ctx, r.client, key, func(ctx context.Context, tx *redis.Tx) error {
 		item, err := r.txGetProxyItem(ctx, tx, name)
 		if err != nil {
 			return errors.WithStack(err)
@@ -214,6 +217,7 @@ func (r *ProxyRepository) UpdateProxy(ctx context.Context, name store.ProxyName,
 		}
 
 		item.UpdatedAt = wrap(time.Now().UTC())
+		item.Revision = item.Revision + 1
 
 		_, err = tx.TxPipelined(ctx, func(p redis.Pipeliner) error {
 			p.HMSet(ctx, key, item.proxyHeaderItem)
@@ -228,7 +232,7 @@ func (r *ProxyRepository) UpdateProxy(ctx context.Context, name store.ProxyName,
 		proxyItem = *item
 
 		return nil
-	})
+	}, r.txMaxAttempts, r.txRetryBaseDelay)
 	if err != nil {
 		return nil, errors.WithStack(err)
 	}
@@ -241,9 +245,11 @@ func (r *ProxyRepository) UpdateProxy(ctx context.Context, name store.ProxyName,
 	return proxy, nil
 }
 
-func NewProxyRepository(client redis.UniversalClient) *ProxyRepository {
+func NewProxyRepository(client redis.UniversalClient, txMaxAttempts int, txRetryBaseDelay time.Duration) *ProxyRepository {
 	return &ProxyRepository{
-		client: client,
+		client:           client,
+		txMaxAttempts:    20,
+		txRetryBaseDelay: txRetryBaseDelay,
 	}
 }
 

internal/store/redis/proxy_repository_test.go

@@ -7,6 +7,6 @@ import (
 )
 
 func TestProxyRepository(t *testing.T) {
-	repository := NewProxyRepository(client)
+	repository := NewProxyRepository(client, DefaultTxMaxAttempts, DefaultTxBaseDelay)
 	testsuite.TestProxyRepository(t, repository)
 }

internal/store/testsuite/layer_repository.go

@@ -3,6 +3,7 @@ package testsuite
 import (
 	"context"
 	"reflect"
+	"sync"
 	"testing"
 
 	"forge.cadoles.com/cadoles/bouncer/internal/store"
@@ -49,6 +50,10 @@ var layerRepositoryTestCases = []layerRepositoryTestCase{
 				return errors.Errorf("layer.UpdatedAt should not be zero value")
 			}
 
+			if layer.Revision != 0 {
+				return errors.Errorf("layer.Revision should be zero")
+			}
+
 			return nil
 		},
 	},
@@ -230,6 +235,86 @@ var layerRepositoryTestCases = []layerRepositoryTestCase{
 				return errors.New("could not find created layer in query results")
 			}
 
+			return nil
+		},
+	},
+	{
+		Name: "Create then update layer",
+		Do: func(repo store.LayerRepository) error {
+			ctx := context.Background()
+
+			var layerName store.LayerName = "create_then_update_layer"
+			var proxyName store.ProxyName = store.ProxyName(string(layerName) + "_proxy")
+			var layerType store.LayerType = "dummy"
+			var layerOptions store.LayerOptions = store.LayerOptions{}
+
+			createdLayer, err := repo.CreateLayer(ctx, proxyName, layerName, layerType, layerOptions)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			if e, g := 0, createdLayer.Revision; e != g {
+				return errors.Errorf("createdLayer.Revision: expected '%v', got '%v'", e, g)
+			}
+
+			updatedLayer, err := repo.UpdateLayer(ctx, proxyName, layerName)
+			if err != nil {
+				return errors.Wrap(err, "err should be nil")
+			}
+
+			if e, g := 1, updatedLayer.Revision; e != g {
+				return errors.Errorf("updatedLayer.Revision: expected '%v', got '%v'", e, g)
+			}
+
+			return nil
+		},
+	},
+	{
+		Name: "Update layer concurrently",
+		Do: func(repo store.LayerRepository) error {
+			ctx := context.Background()
+
+			var layerName store.LayerName = "update_layer_concurrently"
+			var proxyName store.ProxyName = store.ProxyName(string(layerName) + "_proxy")
+			var layerType store.LayerType = "dummy"
+			var layerOptions store.LayerOptions = store.LayerOptions{}
+
+			createdLayer, err := repo.CreateLayer(ctx, proxyName, layerName, layerType, layerOptions)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			if createdLayer.Revision != 0 {
+				return errors.Errorf("createdLayer.Revision should be zero")
+			}
+
+			var wg sync.WaitGroup
+
+			total := 100
+
+			wg.Add(total)
+
+			for i := 0; i < total; i++ {
+				go func(i int) {
+					defer wg.Done()
+
+					if _, err := repo.UpdateLayer(ctx, createdLayer.Proxy, createdLayer.Name); err != nil {
+						panic(errors.Wrap(err, "err should be nil"))
+					}
+				}(i)
+			}
+
+			wg.Wait()
+
+			layer, err := repo.GetLayer(ctx, createdLayer.Proxy, createdLayer.Name)
+			if err != nil {
+				return errors.Wrap(err, "err should be nil")
+			}
+
+			if e, g := total, layer.Revision; e != g {
+				return errors.Errorf("layer.Revision: expected '%v', got '%v'", e, g)
+			}
+
 			return nil
 		},
 	},

internal/store/testsuite/proxy_repository.go

@@ -3,6 +3,7 @@ package testsuite
 import (
 	"context"
 	"reflect"
+	"sync"
 	"testing"
 
 	"forge.cadoles.com/cadoles/bouncer/internal/store"
@@ -51,6 +52,10 @@ var proxyRepositoryTestCases = []proxyRepositoryTestCase{
 				return errors.Errorf("proxy.UpdatedAt should not be zero value")
 			}
 
+			if proxy.Revision != 0 {
+				return errors.Errorf("proxy.Revision should be zero")
+			}
+
 			return nil
 		},
 	},
@@ -99,6 +104,10 @@ var proxyRepositoryTestCases = []proxyRepositoryTestCase{
 				return errors.Errorf("foundProxy.UpdatedAt: expected '%v', got '%v'", createdProxy.UpdatedAt, foundProxy.UpdatedAt)
 			}
 
+			if foundProxy.Revision != 0 {
+				return errors.Errorf("foundProxy.Revision should be zero")
+			}
+
 			return nil
 		},
 	},
@@ -194,6 +203,84 @@ var proxyRepositoryTestCases = []proxyRepositoryTestCase{
 				return errors.Errorf("err: expected store.ErrAlreadyExists, got '%+v'", err)
 			}
 
+			return nil
+		},
+	},
+	{
+		Name: "Create then update proxy",
+		Do: func(repo store.ProxyRepository) error {
+			ctx := context.Background()
+
+			to := "http://example.com"
+
+			var name store.ProxyName = "create_then_update_proxy"
+
+			createdProxy, err := repo.CreateProxy(ctx, name, to, "127.0.0.1:*", "localhost:*")
+			if err != nil {
+				return errors.Wrap(err, "err should be nil")
+			}
+
+			if createdProxy.Revision != 0 {
+				return errors.Errorf("createdProxy.Revision should be zero")
+			}
+
+			updatedProxy, err := repo.UpdateProxy(ctx, name)
+			if err != nil {
+				return errors.Wrap(err, "err should be nil")
+			}
+
+			if e, g := 1, updatedProxy.Revision; e != g {
+				return errors.Errorf("updatedProxy.Revision: expected '%v', got '%v'", e, g)
+			}
+
+			return nil
+		},
+	},
+	{
+		Name: "Update proxy concurrently",
+		Do: func(repo store.ProxyRepository) error {
+			ctx := context.Background()
+
+			to := "http://example.com"
+
+			var name store.ProxyName = "update_proxy_concurrently"
+
+			createdProxy, err := repo.CreateProxy(ctx, name, to, "127.0.0.1:*", "localhost:*")
+			if err != nil {
+				return errors.Wrap(err, "err should be nil")
+			}
+
+			if createdProxy.Revision != 0 {
+				return errors.Errorf("createdProxy.Revision should be zero")
+			}
+
+			var wg sync.WaitGroup
+
+			total := 100
+
+			wg.Add(total)
+
+			for i := 0; i < total; i++ {
+				go func(i int) {
+					defer wg.Done()
+
+					if _, err := repo.UpdateProxy(ctx, name); err != nil {
+						panic(errors.Wrap(err, "err should be nil"))
+					}
+				}(i)
+			}
+
+			wg.Wait()
+
+			proxy, err := repo.GetProxy(ctx, name)
+			if err != nil {
+				return errors.Wrap(err, "err should be nil")
+			}
+
+			if e, g := total, proxy.Revision; e != g {
+				return errors.Errorf("proxy.Revision: expected '%v', got '%v'", e, g)
+			}
+
 			return nil
 		},
 	},