wolfstudy commented on a change in pull request #368: URL: https://github.com/apache/pulsar-client-go/pull/368#discussion_r503661401
########## File path: pulsar/schema.go ########## @@ -0,0 +1,502 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +package pulsar + +import ( + "bytes" + "encoding/json" + "errors" + "reflect" + "unsafe" + + log "github.com/sirupsen/logrus" + + "github.com/gogo/protobuf/proto" + "github.com/linkedin/goavro" +) + +type SchemaType int + +const ( + NONE SchemaType = iota //No schema defined + STRING //Simple String encoding with UTF-8 + JSON //JSON object encoding and validation + PROTOBUF //Protobuf message encoding and decoding + AVRO //Serialize and deserialize via Avro + BOOLEAN // + INT8 //A 8-byte integer. + INT16 //A 16-byte integer. + INT32 //A 32-byte integer. + INT64 //A 64-byte integer. + FLOAT //A float number. + DOUBLE //A double number + _ // + _ // + _ // + KeyValue //A Schema that contains Key Schema and Value Schema. + BYTES = -1 //A bytes array. + AUTO = -2 // + AutoConsume = -3 //Auto Consume Type. + AutoPublish = -4 // Auto Publish Type. +) + +// Encapsulates data around the schema definition +type SchemaInfo struct { + Name string + Schema string + Type SchemaType + Properties map[string]string +} + +type Schema interface { + Encode(v interface{}) ([]byte, error) + Decode(data []byte, v interface{}) error + Validate(message []byte) error + GetSchemaInfo() *SchemaInfo +} + +type AvroCodec struct { + Codec *goavro.Codec +} + +func NewSchemaDefinition(schema *goavro.Codec) *AvroCodec { + schemaDef := &AvroCodec{ + Codec: schema, + } + return schemaDef +} + +// initAvroCodec returns a Codec used to translate between a byte slice of either +// binary or textual Avro data and native Go data. +func initAvroCodec(codec string) (*goavro.Codec, error) { + return goavro.NewCodec(codec) +} + +type JSONSchema struct { + AvroCodec + SchemaInfo +} + +func NewJSONSchema(jsonAvroSchemaDef string, properties map[string]string) *JSONSchema { + js := new(JSONSchema) + avroCodec, err := initAvroCodec(jsonAvroSchemaDef) + if err != nil { + log.Fatalf("init codec error:%v", err) + } + schemaDef := NewSchemaDefinition(avroCodec) + js.SchemaInfo.Schema = schemaDef.Codec.Schema() + js.SchemaInfo.Type = JSON + js.SchemaInfo.Properties = properties + js.SchemaInfo.Name = "Json" + return js +} + +func (js *JSONSchema) Encode(data interface{}) ([]byte, error) { + return json.Marshal(data) +} + +func (js *JSONSchema) Decode(data []byte, v interface{}) error { + return json.Unmarshal(data, v) +} + +func (js *JSONSchema) Validate(message []byte) error { + return js.Decode(message, nil) +} + +func (js *JSONSchema) GetSchemaInfo() *SchemaInfo { + return &js.SchemaInfo +} + +type ProtoSchema struct { + AvroCodec + SchemaInfo +} + +func NewProtoSchema(protoAvroSchemaDef string, properties map[string]string) *ProtoSchema { + ps := new(ProtoSchema) + avroCodec, err := initAvroCodec(protoAvroSchemaDef) + if err != nil { + log.Fatalf("init codec error:%v", err) + } + schemaDef := NewSchemaDefinition(avroCodec) + ps.AvroCodec.Codec = schemaDef.Codec + ps.SchemaInfo.Schema = schemaDef.Codec.Schema() + ps.SchemaInfo.Type = PROTOBUF + ps.SchemaInfo.Properties = properties + ps.SchemaInfo.Name = "Proto" + return ps +} + +func (ps *ProtoSchema) Encode(data interface{}) ([]byte, error) { + return proto.Marshal(data.(proto.Message)) +} + +func (ps *ProtoSchema) Decode(data []byte, v interface{}) error { + return proto.Unmarshal(data, v.(proto.Message)) +} + +func (ps *ProtoSchema) Validate(message []byte) error { + return ps.Decode(message, nil) +} + +func (ps *ProtoSchema) GetSchemaInfo() *SchemaInfo { + return &ps.SchemaInfo +} + +type AvroSchema struct { + AvroCodec + SchemaInfo +} + +func NewAvroSchema(avroSchemaDef string, properties map[string]string) *AvroSchema { + as := new(AvroSchema) + avroCodec, err := initAvroCodec(avroSchemaDef) + if err != nil { + log.Fatalf("init codec error:%v", err) + } + schemaDef := NewSchemaDefinition(avroCodec) + as.AvroCodec.Codec = schemaDef.Codec + as.SchemaInfo.Schema = schemaDef.Codec.Schema() + as.SchemaInfo.Type = AVRO + as.SchemaInfo.Name = "Avro" + as.SchemaInfo.Properties = properties + return as +} + +func (as *AvroSchema) Encode(data interface{}) ([]byte, error) { + textual, err := json.Marshal(data) + if err != nil { + log.Errorf("serialize data error:%s", err.Error()) + return nil, err + } + native, _, err := as.Codec.NativeFromTextual(textual) + if err != nil { + log.Errorf("convert native Go form to binary Avro data error:%s", err.Error()) + return nil, err + } + return as.Codec.BinaryFromNative(nil, native) +} + +func (as *AvroSchema) Decode(data []byte, v interface{}) error { + native, _, err := as.Codec.NativeFromBinary(data) + if err != nil { + log.Errorf("convert binary Avro data back to native Go form error:%s", err.Error()) + return err + } + textual, err := as.Codec.TextualFromNative(nil, native) + if err != nil { + log.Errorf("convert native Go form to textual Avro data error:%s", err.Error()) + return err + } + err = json.Unmarshal(textual, v) + if err != nil { + log.Errorf("unSerialize textual error:%s", err.Error()) + return err + } + return nil +} + +func (as *AvroSchema) Validate(message []byte) error { + return as.Decode(message, nil) +} + +func (as *AvroSchema) GetSchemaInfo() *SchemaInfo { + return &as.SchemaInfo +} + +type StringSchema struct { + SchemaInfo +} + +func NewStringSchema(properties map[string]string) *StringSchema { + strSchema := new(StringSchema) + strSchema.SchemaInfo.Properties = properties + strSchema.SchemaInfo.Name = "String" + strSchema.SchemaInfo.Type = STRING + strSchema.SchemaInfo.Schema = "" + return strSchema +} + +func (ss *StringSchema) Encode(v interface{}) ([]byte, error) { + return []byte(v.(string)), nil +} + +func (ss *StringSchema) Decode(data []byte, v interface{}) error { + bh := (*reflect.SliceHeader)(unsafe.Pointer(&data)) + sh := reflect.StringHeader{ + Data: bh.Data, + Len: bh.Len, + } + shPtr := (*string)(unsafe.Pointer(&sh)) + reflect.ValueOf(v).Elem().Set(reflect.ValueOf(shPtr)) + return nil +} + +func (ss *StringSchema) Validate(message []byte) error { + return ss.Decode(message, nil) +} + +func (ss *StringSchema) GetSchemaInfo() *SchemaInfo { + return &ss.SchemaInfo +} + +type BytesSchema struct { + SchemaInfo +} + +func NewBytesSchema(properties map[string]string) *BytesSchema { + bytesSchema := new(BytesSchema) + bytesSchema.SchemaInfo.Properties = properties + bytesSchema.SchemaInfo.Name = "Bytes" + bytesSchema.SchemaInfo.Type = BYTES + bytesSchema.SchemaInfo.Schema = "" + return bytesSchema +} + +func (bs *BytesSchema) Encode(data interface{}) ([]byte, error) { + return data.([]byte), nil +} + +func (bs *BytesSchema) Decode(data []byte, v interface{}) error { + reflect.ValueOf(v).Elem().Set(reflect.ValueOf(data)) + return nil +} + +func (bs *BytesSchema) Validate(message []byte) error { + return bs.Decode(message, nil) +} + +func (bs *BytesSchema) GetSchemaInfo() *SchemaInfo { + return &bs.SchemaInfo +} + +type Int8Schema struct { + SchemaInfo +} + +func NewInt8Schema(properties map[string]string) *Int8Schema { + int8Schema := new(Int8Schema) + int8Schema.SchemaInfo.Properties = properties + int8Schema.SchemaInfo.Schema = "" + int8Schema.SchemaInfo.Type = INT8 + int8Schema.SchemaInfo.Name = "INT8" + return int8Schema +} + +func (is8 *Int8Schema) Encode(value interface{}) ([]byte, error) { + var buf bytes.Buffer + err := WriteElements(&buf, value.(int8)) + return buf.Bytes(), err +} + +func (is8 *Int8Schema) Decode(data []byte, v interface{}) error { + buf := bytes.NewReader(data) + return ReadElements(buf, v) +} + +func (is8 *Int8Schema) Validate(message []byte) error { + if len(message) != 1 { + return errors.New("size of data received by Int8Schema is not 1") + } + return nil +} + +func (is8 *Int8Schema) GetSchemaInfo() *SchemaInfo { + return &is8.SchemaInfo +} + +type Int16Schema struct { + SchemaInfo +} + +func NewInt16Schema(properties map[string]string) *Int16Schema { + int16Schema := new(Int16Schema) + int16Schema.SchemaInfo.Properties = properties + int16Schema.SchemaInfo.Name = "INT16" + int16Schema.SchemaInfo.Type = INT16 + int16Schema.SchemaInfo.Schema = "" Review comment: For primitives types, the schema field should be `""` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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