[#19] Stop object iteration after all objects were processed

At the moment we don't need logic that swings back to beginning of registry when
all objects have been processed. So, for now we can stop iterating and return an
error when selector reaches the end of registry.

Signed-off-by: Vladimir Domnich <v.domnich@yadro.com>

internal/native/client.go

@@ -231,7 +231,7 @@ func (c *Client) VerifyHash(containerID, objectID, expectedHash string) VerifyHa
 	if err != nil {
 		return VerifyHashResponse{Success: false, Error: err.Error()}
 	}
-	actualHash := hex.EncodeToString(hasher.Sum(make([]byte, 0, sha256.Size)))
+	actualHash := hex.EncodeToString(hasher.Sum(nil))
 	if actualHash != expectedHash {
 		return VerifyHashResponse{Success: true, Error: "hash mismatch"}
 	}

internal/registry/obj_registry.go

@@ -3,6 +3,7 @@ package registry
 import (
 	"encoding/binary"
 	"encoding/json"
+	"errors"
 	"os"
 	"time"
 
@@ -15,7 +16,7 @@ type ObjRegistry struct {
 }
 
 const (
-	// Indicates that an object was created, but its data wasn't verified yet
+	// Indicates that an object was created, but its data wasn't verified yet.
 	statusCreated = "created"
 )
 
@@ -87,7 +88,7 @@ func (o *ObjRegistry) SetObjectStatus(id uint64, newStatus string) error {
 
 		objBytes := b.Get(encodeId(id))
 		if objBytes == nil {
-			return nil
+			return errors.New("object doesn't exist")
 		}
 
 		obj := new(ObjectInfo)
@@ -112,20 +113,19 @@ func (o *ObjRegistry) GetObjectCountInStatus(status string) (int, error) {
 			return nil
 		}
 
-		c := b.Cursor()
+		return b.ForEach(func(_, objBytes []byte) error {
-		for keyBytes, objBytes := c.First(); keyBytes != nil; keyBytes, objBytes = c.Next() {
 			if objBytes != nil {
 				var obj ObjectInfo
 				if err := json.Unmarshal(objBytes, &obj); err != nil {
 					// Ignore malformed objects
-					continue
+					return nil
 				}
 				if obj.Status == status {
 					objCount++
 				}
 			}
-		}
+			return nil
-		return nil
+		})
 	})
 	return objCount, err
 }

internal/registry/obj_selector.go

@@ -2,6 +2,7 @@ package registry
 
 import (
 	"encoding/json"
+	"errors"
 	"sync"
 
 	"go.etcd.io/bbolt"
@@ -59,14 +60,10 @@ func (o *ObjSelector) NextObject() (*ObjectInfo, error) {
 		// Update the last key
 		if keyBytes != nil {
 			o.lastId = decodeId(keyBytes)
-		} else {
+			return nil
-			// Loopback to beginning so that we can revisit objects which were taken for verification
-			// but their status wasn't changed
-			// TODO: stop looping back to beginning too quickly
-			o.lastId = 0
 		}
 
-		return nil
+		return errors.New("no objects are available")
 	})
 	return foundObj, err
 }

internal/registry/registry.go

@@ -49,7 +49,7 @@ func (r *Registry) Exports() modules.Exports {
 // Open creates a new instance of object registry that will store information about objects
 // in the specified file. If repository instance for the file was previously created, then
 // Open will return the existing instance of repository, because bolt database allows only
-// one write connection at a time
+// one write connection at a time.
 func (r *Registry) Open(dbFilePath string) *ObjRegistry {
 	r.root.mu.Lock()
 	defer r.root.mu.Unlock()

internal/s3/client.go

@@ -120,7 +120,7 @@ func (c *Client) VerifyHash(bucket, key, expectedHash string) VerifyHashResponse
 	if err != nil {
 		return VerifyHashResponse{Success: false, Error: err.Error()}
 	}
-	actualHash := hex.EncodeToString(hasher.Sum(make([]byte, 0, sha256.Size)))
+	actualHash := hex.EncodeToString(hasher.Sum(nil))
 	if actualHash != expectedHash {
 		return VerifyHashResponse{Success: true, Error: "hash mismatch"}
 	}

scenarios/verify.js

@@ -39,11 +39,16 @@ if (__ENV.S3_ENDPOINTS) {
 // We will attempt to verify every object in "created" status. The scenario will execute
 // as many scenarios as there are objects. Each object will have 3 retries to be verified
 const obj_count_to_verify = obj_registry.getObjectCountInStatus("created");
+// Execute at least one iteration (shared-iterations can't run 0 iterations)
+const iterations = Math.max(1, obj_count_to_verify);
+// Executor shared-iterations requires number of iterations to be larger than number of VUs
+const vus = Math.min(__ENV.CLIENTS, iterations);
+
 const scenarios = {
     verify: {
         executor: 'shared-iterations',
-        vus: __ENV.CLIENTS,
+        vus,
-        iterations: obj_count_to_verify,
+        iterations,
         maxDuration: `${time_limit}s`,
         exec: 'obj_verify',
         gracefulStop: '5s',
@@ -51,7 +56,7 @@ const scenarios = {
 };
 
 export const options = {
-    scenarios: scenarios,
+    scenarios,
     setupTimeout: '5s',
 };