Error handling improvement for storage and util packages

asserter/block.go

@@ -486,7 +486,11 @@ func (a *Asserter) Transaction(
 // invalid transaction identifiers, or a direction not defined by the enum.
 func (a *Asserter) RelatedTransactions(relatedTransactions []*types.RelatedTransaction) error {
 	if dup := DuplicateRelatedTransaction(relatedTransactions); dup != nil {
-		return fmt.Errorf("%w: %v", ErrDuplicateRelatedTransaction, dup)
+		return fmt.Errorf(
+			"related transaction %s is invalid: %w",
+			types.PrintStruct(dup),
+			ErrDuplicateRelatedTransaction,
+		)
 	}
 
 	for i, relatedTransaction := range relatedTransactions {

constructor/worker/populator.go

@@ -43,7 +43,7 @@ func PopulateInput(state string, input string) (string, error) {
 		return value.Raw
 	})
 	if err != nil {
-		return "", fmt.Errorf("%w: unable to insert variables", err)
+		return "", fmt.Errorf("unable to insert variables: %w", err)
 	}
 
 	if !gjson.Valid(input) {

constructor/worker/worker.go

@@ -85,7 +85,7 @@ func (w *Worker) invokeWorker(
 	case job.GetBlob:
 		return w.GetBlobWorker(ctx, dbTx, input)
 	default:
-		return "", fmt.Errorf("%w: %s", ErrInvalidActionType, action)
+		return "", ErrInvalidActionType
 	}
 }
 
@@ -237,7 +237,7 @@ func GenerateKeyWorker(rawInput string) (string, error) {
 	var input job.GenerateKeyInput
 	err := job.UnmarshalInput([]byte(rawInput), &input)
 	if err != nil {
-		return "", fmt.Errorf("%w: %s", ErrInvalidInput, err.Error())
+		return "", fmt.Errorf("failed to unmarshal input: %w", err)
 	}
 
 	kp, err := keys.GenerateKeypair(input.CurveType)
@@ -303,7 +303,7 @@ func MathWorker(rawInput string) (string, error) {
 	var input job.MathInput
 	err := job.UnmarshalInput([]byte(rawInput), &input)
 	if err != nil {
-		return "", fmt.Errorf("%w: %s", ErrInvalidInput, err.Error())
+		return "", fmt.Errorf("failed to unmarshal input: %w", err)
 	}
 
 	var result string
@@ -880,10 +880,10 @@ func HTTPRequestWorker(rawInput string) (string, error) {
 
 	if resp.StatusCode != http.StatusOK {
 		return "", fmt.Errorf(
-			"%w: status code %d with body %s",
-			ErrActionFailed,
+			"status code %d with body %s: %w",
 			resp.StatusCode,
 			body,
+			ErrActionFailed,
 		)
 	}
 

constructor/worker/worker_test.go

@@ -1474,7 +1474,7 @@ func TestJob_Failures(t *testing.T) {
 					OutputPath: "key",
 				},
 				ProcessedInput: `{"curve_typ": "secp256k1"}`,
-				Err:            ErrInvalidInput,
+				Err:            fmt.Errorf("unknown field \"curve_typ\""),
 			},
 			helper: &mocks.Helper{},
 		},

fetcher/utils.go

@@ -90,9 +90,9 @@ func tryAgain(fetchMsg string, thisBackoff *Backoff, err *Error) *Error {
 	if nextBackoff == backoff.Stop {
 		return &Error{
 			Err: fmt.Errorf(
-				"%w: %s",
-				ErrExhaustedRetries,
+				"fetch message %s: %w",
 				fetchMsg,
+				ErrExhaustedRetries,
 			),
 		}
 	}

parser/intent.go

@@ -109,9 +109,9 @@ func (p *Parser) ExpectedOperations(
 
 		if !foundMatch && errExtra {
 			return fmt.Errorf(
-				"%w: %s",
+				"operation %s: %w",
+				types.PrintStruct(obs),
 				ErrExpectedOperationsExtraOperation,
-				types.PrettyPrintStruct(obs),
 			)
 		}
 	}

storage/database/badger_database.go

@@ -262,13 +262,13 @@ func NewBadgerDatabase(
 
 	db, err := badger.Open(b.badgerOptions)
 	if err != nil {
-		return nil, fmt.Errorf("%w: %v", storageErrs.ErrDatabaseOpenFailed, err)
+		return nil, fmt.Errorf("unable to open database: %w", err)
 	}
 	b.db = db
 
 	encoder, err := encoder.NewEncoder(b.compressorEntries, b.pool, b.compress)
 	if err != nil {
-		return nil, fmt.Errorf("%w: %v", storageErrs.ErrCompressorLoadFailed, err)
+		return nil, fmt.Errorf("unable to load compressor: %w", err)
 	}
 	b.encoder = encoder
 
@@ -286,7 +286,7 @@ func (b *BadgerDatabase) Close(ctx context.Context) error {
 	close(b.closed)
 
 	if err := b.db.Close(); err != nil {
-		return fmt.Errorf("%w: %v", storageErrs.ErrDBCloseFailed, err)
+		return fmt.Errorf("unable to close badger database: %w", err)
 	}
 
 	return nil
@@ -436,7 +436,7 @@ func (b *BadgerTransaction) Commit(context.Context) error {
 	b.releaseLocks()
 
 	if err != nil {
-		return fmt.Errorf("%w: %v", storageErrs.ErrCommitFailed, err)
+		return fmt.Errorf("unable to commit transaction: %w", err)
 	}
 
 	return nil
@@ -494,15 +494,19 @@ func (b *BadgerTransaction) Get(
 	if err == badger.ErrKeyNotFound {
 		return false, nil, nil
 	} else if err != nil {
-		return false, nil, err
+		return false, nil, fmt.Errorf("unable to get the item of key %s within a transaction: %w", string(key), err)
 	}
 
 	err = item.Value(func(v []byte) error {
 		_, err := value.Write(v)
 		return err
 	})
 	if err != nil {
-		return false, nil, err
+		return false, nil, fmt.Errorf(
+			"unable to get the value from the item for key %s: %w",
+			string(key),
+			err,
+		)
 	}
 
 	return true, value.Bytes(), nil
@@ -539,13 +543,17 @@ func (b *BadgerTransaction) Scan(
 		k := item.Key()
 		err := item.Value(func(v []byte) error {
 			if err := worker(k, v); err != nil {
-				return fmt.Errorf("%w: worker failed for key %s", err, string(k))
+				return fmt.Errorf("worker failed for key %s: %w", string(k), err)
 			}
 
 			return nil
 		})
 		if err != nil {
-			return -1, fmt.Errorf("%w: unable to get value for key %s", err, string(k))
+			return -1, fmt.Errorf(
+				"unable to get the value from the item for key %s: %w",
+				string(k),
+				err,
+			)
 		}
 
 		entries++
@@ -568,7 +576,12 @@ func decompressAndSave(
 	// encoded using dictionary compression.
 	decompressed, err := encoder.DecodeRaw(namespace, v)
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w %s: %v", storageErrs.ErrDecompressFailed, string(k), err)
+		return -1, -1, fmt.Errorf(
+			"unable to decompress for namespace %s and input %s: %w",
+			namespace,
+			string(v),
+			err,
+		)
 	}
 
 	err = ioutil.WriteFile(
@@ -577,7 +590,11 @@ func decompressAndSave(
 		os.FileMode(utils.DefaultFilePermissions),
 	)
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrDecompressSaveUnsuccessful, err)
+		return -1, -1, fmt.Errorf(
+			"unable to write decompress file %s: %w",
+			path.Join(tmpDir, types.Hash(string(k))),
+			err,
+		)
 	}
 
 	return float64(len(decompressed)), float64(len(v)), nil
@@ -591,27 +608,26 @@ func decompressAndEncode(
 	decompressed, err := ioutil.ReadFile(path) // #nosec G304
 	if err != nil {
 		return -1, -1, -1, fmt.Errorf(
-			"%w for file %s: %v",
-			storageErrs.ErrLoadFileUnsuccessful,
+			"unable to read decompress file %s: %w",
 			path,
 			err,
 		)
 	}
 
 	normalCompress, err := encoder.EncodeRaw("", decompressed)
 	if err != nil {
-		return -1, -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrCompressNormalFailed, err)
+		return -1, -1, -1, fmt.Errorf("unable to compress normal: %w", err)
 	}
 
 	dictCompress, err := encoder.EncodeRaw(namespace, decompressed)
 	if err != nil {
-		return -1, -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrCompressWithDictFailed, err)
+		return -1, -1, -1, fmt.Errorf("unable to compress with dictionary: %w", err)
 	}
 
 	// Ensure dict works
 	decompressedDict, err := encoder.DecodeRaw(namespace, dictCompress)
 	if err != nil {
-		return -1, -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrDecompressWithDictFailed, err)
+		return -1, -1, -1, fmt.Errorf("unable to decompress with dictionary: %w", err)
 	}
 
 	if types.Hash(decompressed) != types.Hash(decompressedDict) {
@@ -644,12 +660,17 @@ func recompress(
 		func(k []byte, v []byte) error {
 			decompressed, err := badgerDb.Encoder().DecodeRaw(namespace, v)
 			if err != nil {
-				return fmt.Errorf("%w %s: %v", storageErrs.ErrDecompressFailed, string(k), err)
+				return fmt.Errorf(
+					"unable to decompress for namespace %s and input %s: %w",
+					namespace,
+					string(v),
+					err,
+				)
 			}
 
 			newCompressed, err := newCompressor.EncodeRaw(namespace, decompressed)
 			if err != nil {
-				return fmt.Errorf("%w: %v", storageErrs.ErrCompressWithDictFailed, err)
+				return fmt.Errorf("unable to compress with dictionary: %w", err)
 			}
 			onDiskSize += float64(len(v))
 			newSize += float64(len(newCompressed))
@@ -660,7 +681,7 @@ func recompress(
 		false,
 	)
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrRecompressFailed, err)
+		return -1, -1, fmt.Errorf("unable to recompress: %w", err)
 	}
 
 	// Negative savings here means that the new dictionary
@@ -691,14 +712,14 @@ func BadgerTrain(
 		WithCompressorEntries(compressorEntries),
 	)
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w: unable to load database", err)
+		return -1, -1, fmt.Errorf("unable to load database: %w", err)
 	}
 	defer badgerDb.Close(ctx)
 
 	// Create directory to store uncompressed files for training
 	tmpDir, err := utils.CreateTempDir()
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrCreateTempDirectoryFailed, err)
+		return -1, -1, fmt.Errorf("unable to create temporary directory: %w", err)
 	}
 	defer utils.RemoveTempDir(tmpDir)
 
@@ -724,7 +745,7 @@ func BadgerTrain(
 				v,
 			)
 			if err != nil {
-				return fmt.Errorf("%w: unable to decompress and save", err)
+				return fmt.Errorf("unable to decompress and save: %w", err)
 			}
 
 			totalUncompressedSize += decompressedSize
@@ -774,11 +795,11 @@ func BadgerTrain(
 		dictPath,
 	) // #nosec G204
 	if err := cmd.Start(); err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrInvokeZSTDFailed, err)
+		return -1, -1, fmt.Errorf("unable to start zstd: %w", err)
 	}
 
 	if err := cmd.Wait(); err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrTrainZSTDFailed, err)
+		return -1, -1, fmt.Errorf("unable to train zstd: %w", err)
 	}
 
 	encoder, err := encoder.NewEncoder([]*encoder.CompressorEntry{
@@ -788,7 +809,7 @@ func BadgerTrain(
 		},
 	}, encoder.NewBufferPool(), true)
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrCompressorLoadFailed, err)
+		return -1, -1, fmt.Errorf("unable to load compressor: %w", err)
 	}
 
 	sizeUncompressed := float64(0)
@@ -809,7 +830,7 @@ func BadgerTrain(
 			encoder,
 		)
 		if err != nil {
-			return fmt.Errorf("%w: unable to decompress and encode", err)
+			return fmt.Errorf("unable to decompress and encode: %w", err)
 		}
 
 		sizeUncompressed += decompressed
@@ -819,7 +840,7 @@ func BadgerTrain(
 		return nil
 	})
 	if err != nil {
-		return -1, -1, fmt.Errorf("%w: %v", storageErrs.ErrWalkFilesFailed, err)
+		return -1, -1, fmt.Errorf("unable to walk files: %w", err)
 	}
 
 	log.Printf(