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registry.go
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registry.go
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package schemaregistry
import (
"bytes"
"fmt"
"github.com/olekukonko/tablewriter"
"sync"
registry "github.com/landoop/schema-registry"
"github.com/tryfix/log"
)
// Version is the type to hold default register vrsion options
type Version int
const (
//VersionLatest constant hold the flag to register the latest version of the subject
VersionLatest Version = -1
//VersionAll constant hold the flag to register all the versions of the subject
VersionAll Version = -2
)
// String returns the registed version type
func (v Version) String() string {
if v == VersionLatest {
return `Latest`
}
if v == VersionAll {
return `All`
}
return fmt.Sprint(int(v))
}
type jsonDecoder func(data []byte) (v interface{}, err error)
//Subject holds the Schema information of the registered subject
type Subject struct {
Schema string `json:"subject"` // The actual AVRO subject
Subject string `json:"subject"` // Subject where the subject is registered for
Version int `json:"version"` // Version within this subject
Id int `json:"id"` // Registry's unique id
JsonDecoder jsonDecoder `json:"json_decoder"`
}
type options struct {
backGroundSync bool
bootstrapServers []string
storageTopic string
logger log.Logger
}
// Registry type holds schema registry details
type Registry struct {
schemas map[string]map[int]*Encoder // subject/version/encoder
idMap map[int]*Encoder
client *registry.Client
mu *sync.RWMutex
options *options
logger log.Logger
}
//Option is a type to host NewRegistry configurations
type Option func(*options)
// WithBackgroundSync returns a Configurations to create a NewRegistry with kafka dynamic schema sync.
// function required slice of kafka bootstrapServers and schema storageTopic as inputs
func WithBackgroundSync(bootstrapServers []string, storageTopic string) Option {
return func(options *options) {
options.bootstrapServers = bootstrapServers
options.storageTopic = storageTopic
options.backGroundSync = true
}
}
//WithLogger returns a Configurations to create a NewRegistry with given PrefixedLogger
func WithLogger(logger log.Logger) Option {
return func(options *options) {
options.logger = logger
}
}
// NewRegistry returns pointer to connected registry with given options or error if it's unable to connect
func NewRegistry(url string, opts ...Option) (*Registry, error) {
options := new(options)
for _, opt := range opts {
opt(options)
}
if options.logger == nil {
options.logger = log.NewNoopLogger()
}
c, err := registry.NewClient(url)
if err != nil {
return nil, err
}
r := &Registry{
schemas: make(map[string]map[int]*Encoder),
idMap: make(map[int]*Encoder),
client: c,
mu: new(sync.RWMutex),
options: options,
logger: options.logger,
}
return r, nil
}
// Register registers the given subject, version and JSON value decoder to the Registry
func (r *Registry) Register(subject string, version int, decoder jsonDecoder) error {
if _, ok := r.schemas[subject]; ok {
if _, ok := r.schemas[subject][version]; ok {
r.logger.Warn(`schemaregistry.registry`, fmt.Sprintf(`subject [%s][%s] already registred`, subject, Version(version)))
}
}
if version == int(VersionAll) {
versions, err := r.client.Versions(subject)
if err != nil {
return err
}
for _, v := range versions {
if err := r.Register(subject, v, decoder); err != nil {
return err
}
}
return nil
}
var clientSub registry.Schema
if version == int(VersionLatest) {
sub, err := r.client.GetLatestSchema(subject)
if err != nil {
return err
}
clientSub = sub
} else {
sub, err := r.client.GetSchemaBySubject(subject, version)
if err != nil {
return err
}
clientSub = sub
}
s := &Subject{
Schema: clientSub.Schema,
Id: clientSub.ID,
Version: clientSub.Version,
Subject: clientSub.Subject,
JsonDecoder: decoder,
}
if r.schemas[subject] == nil {
r.schemas[subject] = make(map[int]*Encoder)
}
e, err := NewEncoder(r, s)
if err != nil {
return err
}
r.schemas[subject][version] = e
r.idMap[clientSub.ID] = e
r.logger.Info(`schemaregistry.registry`, fmt.Sprintf(`subject [%s][%s] registred`, subject, Version(version)))
return nil
}
// Sync function start the background schema sync from kafka topic
//
// Newly Created Schemas will register in background and application does not require any restart
func (r *Registry) Sync() error {
if r.options.backGroundSync {
bgSync, err := newSync(r.options.bootstrapServers, r.options.storageTopic, r)
if err != nil {
return err
}
if err := bgSync.start(); err != nil {
return err
}
}
return nil
}
// WithSchema return the specific encoder which registered at the initialization under the subject and version
func (r *Registry) WithSchema(subject string, version int) *Encoder {
r.mu.Lock()
defer r.mu.Unlock()
e, ok := r.schemas[subject][version]
if !ok {
panic(fmt.Sprintf(`schemaregistry.registry: unregistred subject [%s][%d]`, subject, version))
}
return e
}
// WithLatestSchema returns the latest event version encoder registered under given subject
func (r *Registry) WithLatestSchema(subject string) *Encoder {
r.mu.Lock()
defer r.mu.Unlock()
versions, ok := r.schemas[subject]
if !ok {
panic(fmt.Sprintf(`schemaregistry.registry: unregistred subject [%s]`, subject))
}
var v int
for _, version := range versions {
if version.subject.Version > v {
v = version.subject.Version
}
}
return versions[v]
}
func (r *Registry) GenericEncoder() *GenericEncoder {
return &GenericEncoder{
registry: r,
}
}
func (r *Registry) Print() {
b := new(bytes.Buffer)
table := tablewriter.NewWriter(b)
table.SetHeader([]string{`Schema Id`, `subject`, `version`, `json decoder`})
for _, subject := range r.schemas {
for _, version := range subject {
table.SetColumnAlignment([]int{tablewriter.ALIGN_LEFT})
table.SetAutoFormatHeaders(true)
table.Append([]string{
fmt.Sprint(version.subject.Id),
fmt.Sprint(version.subject.Subject),
fmt.Sprint(Version(version.subject.Version)),
fmt.Sprint(version.subject.JsonDecoder != nil),
//fmt.Sprint(version.subject.Schema),
})
}
}
table.Render()
r.logger.Info(`schemaregistry.registry`, fmt.Sprintf("schemas\n%s", b.String()))
}