forked from elodina/go-avro
/
register.go
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/
register.go
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package avro
/**
* Simple schema client for goavro,
* wrap for goavro/schemaclient, added a client interface for unit test
*/
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strconv"
"strings"
"sync"
"github.com/getsentry/raven-go"
)
const (
GET_SCHEMA_BY_ID = "/schemas/ids/%d"
GET_SUBJECTS = "/subjects"
GET_SUBJECT_VERSIONS = "/subjects/%s-value/versions"
GET_SPECIFIC_SUBJECT_VERSION = "/subjects/%s-value/versions/%s"
REGISTER_NEW_SCHEMA = "/subjects/%s-value/versions"
CHECK_IS_REGISTERED = "/subjects/%s-value"
TEST_COMPATIBILITY = "/compatibility/subjects/%s-value/versions/%s"
CONFIG = "/config"
ENV_REGISTRY = "SCHEMA_REGISTRY_ADDR"
)
type SchemaRegistryClient interface {
Register(subject string, schema Schema) (int32, error)
GetByID(id int32) (Schema, error)
GetLatestSchemaMetadata(subject string) (*SchemaMetadata, error)
GetVersion(subject string, schema Schema) (int32, error)
GetIDBySchema(subject string, schema Schema) (int32, error)
}
type RegistryAuth struct {
User string
Key string
}
func NewRegistryAuth(user string, key string) *RegistryAuth {
return &RegistryAuth{
User: user,
Key: key,
}
}
type SchemaMetadata struct {
Id int32
Version int32
Schema string
}
type CompatibilityLevel string
const (
BackwardCompatibilityLevel CompatibilityLevel = "BACKWARD"
ForwardCompatibilityLevel CompatibilityLevel = "FORWARD"
FullCompatibilityLevel CompatibilityLevel = "FULL"
NoneCompatibilityLevel CompatibilityLevel = "NONE"
)
const (
SCHEMA_REGISTRY_V1_JSON = "application/vnd.schemaregistry.v1+json"
SCHEMA_REGISTRY_V1_JSON_WEIGHTED = "application/vnd.schemaregistry.v1+json"
SCHEMA_REGISTRY_MOST_SPECIFIC_DEFAULT = "application/vnd.schemaregistry.v1+json"
SCHEMA_REGISTRY_DEFAULT_JSON = "application/vnd.schemaregistry+json"
SCHEMA_REGISTRY_DEFAULT_JSON_WEIGHTED = "application/vnd.schemaregistry+json qs=0.9"
JSON = "application/json"
JSON_WEIGHTED = "application/json qs=0.5"
GENERIC_REQUEST = "application/octet-stream"
)
const (
SCHEMA_NOT_FOUND int32 = 40403
)
var PREFERRED_RESPONSE_TYPES = []string{SCHEMA_REGISTRY_V1_JSON, SCHEMA_REGISTRY_DEFAULT_JSON, JSON}
type ErrorMessage struct {
Error_code int32
Message string
}
func (this *ErrorMessage) Error() string {
return fmt.Sprintf("%s(error code: %d)", this.Message, this.Error_code)
}
type RegisterSchemaResponse struct {
Id int32
}
type GetSchemaResponse struct {
Schema string
}
type GetSubjectVersionResponse struct {
Subject string
Version int32
Id int32
Schema string
}
type CachedSchemaRegistryClient struct {
registryURL string
schemaCache sync.Map
idCache sync.Map
versionCache sync.Map
auth *RegistryAuth
isReg bool
}
/**
* Refactor to interface, for Unit testing
*/
type RegistryClient interface {
Register(subject string, schema Schema) (int32, error)
GetByID(id int32) (Schema, error)
GetIDBySchema(subject string, schema Schema) (int32, error)
IsReg() bool
}
func NewCachedSchemaRegistryClient(registryURL string) *CachedSchemaRegistryClient {
if registryURL == "" {
registryURL = os.Getenv(ENV_REGISTRY)
}
fmt.Println("RegistryURL=", registryURL)
if registryURL == "" {
fmt.Println("Warning: you have not set SCHEMA_REGISTRY_ADDR in the env, will not register the schema!")
}
return NewCachedSchemaRegistryClientAuth(registryURL, nil)
}
func NewCachedSchemaRegistryClientAuth(registryURL string, auth *RegistryAuth) *CachedSchemaRegistryClient {
return &CachedSchemaRegistryClient{
registryURL: registryURL,
auth: auth,
isReg: len(registryURL) > 0,
}
}
func (this *CachedSchemaRegistryClient) IsReg() bool {
return this.isReg
}
func (this *CachedSchemaRegistryClient) Register(subject string, schema Schema) (int32, error) {
var schemaIdMap map[string]int32
var exists bool
var id int32
var ok bool
schemaStr:=schema.String()
tempSchemaIDMap, exists := this.schemaCache.Load(subject)
if exists {
if schemaIdMap, ok = tempSchemaIDMap.(map[string]int32); ok {
if id, exists = schemaIdMap[schemaStr]; exists {
return id, nil
}
} else {
this.schemaCache.Delete(subject)
schemaIdMap=make(map[string]int32)
}
} else {
schemaIdMap = make(map[string]int32)
}
request, err := this.newDefaultRequest("POST",
fmt.Sprintf(REGISTER_NEW_SCHEMA, subject),
strings.NewReader(fmt.Sprintf("{\"schema\": %s}", strconv.Quote(schema.String()))))
response, err := http.DefaultClient.Do(request)
if err != nil {
return 0, err
}
if this.isOK(response) {
decodedResponse := &RegisterSchemaResponse{}
if err := this.handleSuccess(response, decodedResponse); err != nil {
return 0, err
}
schemaIdMap[schemaStr] = decodedResponse.Id
this.schemaCache.Store(subject, schemaIdMap)
this.idCache.Store(decodedResponse.Id, schema)
return decodedResponse.Id, err
} else {
return 0, this.handleError(response)
}
}
func (this *CachedSchemaRegistryClient) GetByID(id int32) (Schema, error) {
var schema Schema
var exists bool
tempSchema, exists := this.idCache.Load(id)
if exists {
if schema, ok := tempSchema.(Schema); ok {
return schema, nil
}
}
request, err := this.newDefaultRequest("GET", fmt.Sprintf(GET_SCHEMA_BY_ID, id), nil)
if err != nil {
return nil, err
}
response, err := http.DefaultClient.Do(request)
if err != nil {
return nil, err
}
if this.isOK(response) {
decodedResponse := &GetSchemaResponse{}
if err := this.handleSuccess(response, decodedResponse); err != nil {
return nil, err
}
schema, err = ParseSchema(decodedResponse.Schema)
this.idCache.Store(id, schema)
// this.lock.Lock()
// this.idCache[id] = schema
// this.lock.Unlock()
return schema, err
} else {
return nil, this.handleError(response)
}
}
func (this *CachedSchemaRegistryClient) GetLatestSchemaMetadata(subject string) (*SchemaMetadata, error) {
request, err := this.newDefaultRequest("GET", fmt.Sprintf(GET_SPECIFIC_SUBJECT_VERSION, subject, "latest"), nil)
if err != nil {
return nil, err
}
response, err := http.DefaultClient.Do(request)
if err != nil {
return nil, err
}
if this.isOK(response) {
decodedResponse := &GetSubjectVersionResponse{}
if err := this.handleSuccess(response, decodedResponse); err != nil {
return nil, err
}
return &SchemaMetadata{decodedResponse.Id, decodedResponse.Version, decodedResponse.Schema}, err
} else {
return nil, this.handleError(response)
}
}
func (this *CachedSchemaRegistryClient) GetVersion(subject string, schema Schema) (int32, error) {
var schemaVersionMap map[string]int32
var exists bool
var ok bool
var version int32
schemaStr:=schema.String()
tempSchemaVMap, exists := this.versionCache.Load(subject)
if exists {
schemaVersionMap, ok = tempSchemaVMap.(map[string]int32)
if ok {
if version, exists = schemaVersionMap[schemaStr]; exists {
return version, nil
}
} else {
schemaVersionMap =make(map[string]int32)
this.versionCache.Delete(subject)
}
} else {
schemaVersionMap = make(map[string]int32)
}
decodedResponse, err := this.checkIfRegistered(subject, schema)
if err != nil {
return 0, err
}
schemaVersionMap[schemaStr] = decodedResponse.Version
this.versionCache.Store(subject, schemaVersionMap)
return decodedResponse.Version, nil
}
// GetIDBySchema 通过subject,schema获取schemaID
func (this *CachedSchemaRegistryClient) GetIDBySchema(subject string, schema Schema) (int32, error) {
var schemaIDMap map[string]int32
var exists bool
var id int32
var ok bool
schemaStr:=schema.String()
// 在缓存中查找
tempSchemaIDMap, exists := this.schemaCache.Load(subject)
if exists {
schemaIDMap, ok = tempSchemaIDMap.(map[string]int32)
if ok {
if id, exists = schemaIDMap[schemaStr]; exists {
return id, nil
}
} else {
schemaIDMap = make(map[string]int32)
this.schemaCache.Delete(subject)
}
} else {
schemaIDMap = make(map[string]int32)
}
// 向注册中心请求
decodedResponse, err := this.checkIfRegistered(subject, schema)
if err != nil {
return 0, err
}
schemaIDMap[schemaStr] = decodedResponse.Id
this.schemaCache.Store(subject, schemaIDMap)
return decodedResponse.Id, nil
}
func (this *CachedSchemaRegistryClient) checkIfRegistered(subject string, schema Schema) (*GetSubjectVersionResponse, error) {
request, err := this.newDefaultRequest("POST",
fmt.Sprintf(CHECK_IS_REGISTERED, subject),
strings.NewReader(fmt.Sprintf("{\"schema\": %s}", strconv.Quote(schema.String()))))
response, err := http.DefaultClient.Do(request)
if err != nil {
return nil, err
}
if this.isOK(response) {
decodedResponse := &GetSubjectVersionResponse{}
if err := this.handleSuccess(response, decodedResponse); err != nil {
return nil, err
}
return decodedResponse, nil
}
handleErr:=this.handleError(response)
// schema not found 发sentry
raven.CapturePanic(func() {
if errMsg,ok:=handleErr.(*ErrorMessage);ok{
if errMsg.Error_code==SCHEMA_NOT_FOUND{
panic("Schema not found")
}
}
},map[string]string{"subject":subject})
return nil, handleErr
}
func (this *CachedSchemaRegistryClient) newDefaultRequest(method string, uri string, reader io.Reader) (*http.Request, error) {
url := fmt.Sprintf("%s%s", this.registryURL, uri)
request, err := http.NewRequest(method, url, reader)
if err != nil {
return nil, err
}
request.Header.Set("Accept", SCHEMA_REGISTRY_V1_JSON)
request.Header.Set("Content-Type", SCHEMA_REGISTRY_V1_JSON)
if this.auth != nil {
request.Header.Set("X-Api-User", this.auth.User)
request.Header.Set("X-Api-Key", this.auth.Key)
}
return request, nil
}
func (this *CachedSchemaRegistryClient) isOK(response *http.Response) bool {
return response.StatusCode >= 200 && response.StatusCode < 300
}
func (this *CachedSchemaRegistryClient) handleSuccess(response *http.Response, model interface{}) error {
responseBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return err
}
return json.Unmarshal(responseBytes, model)
}
func (this *CachedSchemaRegistryClient) handleError(response *http.Response) error {
registryError := &ErrorMessage{}
responseBytes, err := ioutil.ReadAll(response.Body)
if err != nil {
return err
}
err = json.Unmarshal(responseBytes, registryError)
if err != nil {
return err
}
return registryError
}