{"record":{"id":"272517b9b01c2d58","repo":"hyperledger/fabric","slug":"error-marshalling-proto-message-to-write-to-the-sn-272517","errorCode":null,"errorMessage":"error marshalling proto message to write to the snapshot file: %s","messagePattern":"error marshalling proto message to write to the snapshot file: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"common/ledger/snapshot/file.go","lineNumber":74,"sourceCode":"\t\tmultiWriter:       multiWriter,\n\t\thasher:            hashImpl,\n\t\tvarintReusableBuf: make([]byte, binary.MaxVarintLen64),\n\t}, nil\n}\n\n// EncodeString encodes and appends the string to the data stream\nfunc (c *FileWriter) EncodeString(str string) error {\n\treturn c.EncodeBytes([]byte(str))\n}\n\n// EncodeProtoMessage encodes and appends a proto message to the data stream\nfunc (c *FileWriter) EncodeProtoMessage(m proto.Message) error {\n\tif m == nil || !m.ProtoReflect().IsValid() {\n\t\treturn errors.Errorf(\"error marshalling proto message to write to the snapshot file: %s: proto: Marshal called with nil\", c.file.Name())\n\t}\n\tb, err := proto.Marshal(m)\n\tif err != nil {\n\t\treturn errors.Wrapf(err, \"error marshalling proto message to write to the snapshot file: %s\", c.file.Name())\n\t}\n\treturn c.EncodeBytes(b)\n}\n\n// EncodeBytes encodes and appends bytes to the data stream\nfunc (c *FileWriter) EncodeBytes(b []byte) error {\n\tif err := c.EncodeUVarint(uint64(len(b))); err != nil {\n\t\treturn err\n\t}\n\tif _, err := c.multiWriter.Write(b); err != nil {\n\t\treturn errors.Wrapf(err, \"error while writing data to the snapshot file: %s\", c.file.Name())\n\t}\n\treturn nil\n}\n\n// EncodeUVarint encodes and appends a number to the data stream\nfunc (c *FileWriter) EncodeUVarint(u uint64) error {\n\tn := binary.PutUvarint(c.varintReusableBuf, u)","sourceCodeStart":56,"sourceCodeEnd":92,"githubUrl":"https://github.com/hyperledger/fabric/blob/2736b63f8fd5932511d56fe68b7039d15977f7f6/common/ledger/snapshot/file.go#L56-L92","documentation":"This error is returned when proto.Marshal itself fails while serializing a valid proto message for the snapshot file. EncodeProtoMessage wraps the underlying proto error with the snapshot file name. Unlike error 310, the message was non-nil but its contents could not be marshalled (e.g. required extensions, unknown enum values, or marshal-time restrictions).","triggerScenarios":"proto.Marshal(m) returns an error for a non-nil, valid message — e.g. messages with unmarshalable content, or corrupted in-memory state produced by hand-crafted reflection.","commonSituations":"Writing snapshot data from messages that failed validation upstream, or using generated proto types from mismatched protoc/runtime versions where marshal hits unsupported fields.","solutions":["Inspect the wrapped inner error from proto.Marshal to identify the offending message/field","Validate/sanitize the message contents before AddData","Regenerate proto types with a protoc-gen-go version compatible with google.golang.org/protobuf in go.mod"],"exampleFix":"// before\nb, err := proto.Marshal(m) // opaque failure\n// after\nif err := protocheck.Validate(m); err != nil { // validate first\n    return errors.Wrapf(err, \"invalid message for snapshot %s\", c.file.Name())\n}\nb, err := proto.Marshal(m)","handlingStrategy":"try-catch","validationCode":"if _, err := proto.Marshal(msg); err != nil { return errors.Wrap(err, \"message not marshalable\") }","typeGuard":null,"tryCatchPattern":"if err := w.AddData(k, msg); err != nil {\n    return fmt.Errorf(\"snapshot export aborted while writing key %s: %w\", k, err)\n}","preventionTips":["Keep protoc-gen-go and google.golang.org/protobuf versions in sync","Validate message contents before writing to the snapshot","Preserve the wrapped inner error for diagnosis"],"tags":["protobuf","snapshot","serialization","ledger"],"backgroundTag":"proto-marshal-failed","analyzedSha":"2736b63f8fd5932511d56fe68b7039d15977f7f6","analyzedAt":"2026-09-04T08:52:36.465Z","contentChangedAt":"2026-09-04T08:52:36.465Z","schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}