161 lines
3.2 KiB
Go
161 lines
3.2 KiB
Go
// Package service implements the store service interface
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package service
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import (
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"context"
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"io"
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"time"
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"github.com/micro/go-micro/client"
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"github.com/micro/go-micro/metadata"
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"github.com/micro/go-micro/store"
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pb "github.com/micro/go-micro/store/service/proto"
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)
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type serviceStore struct {
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options store.Options
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// Namespace to use
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Namespace string
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// Addresses of the nodes
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Nodes []string
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// Prefix to use
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Prefix string
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// store service client
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Client pb.StoreService
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}
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func (s *serviceStore) Init(opts ...store.Option) error {
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for _, o := range opts {
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o(&s.options)
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}
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s.Namespace = s.options.Namespace
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s.Prefix = s.options.Prefix
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s.Nodes = s.options.Nodes
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return nil
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}
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func (s *serviceStore) Context() context.Context {
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ctx := context.Background()
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md := make(metadata.Metadata)
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if len(s.Namespace) > 0 {
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md["Micro-Namespace"] = s.Namespace
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}
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if len(s.Prefix) > 0 {
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md["Micro-Prefix"] = s.Prefix
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}
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return metadata.NewContext(ctx, md)
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}
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// Sync all the known records
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func (s *serviceStore) List() ([]*store.Record, error) {
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stream, err := s.Client.List(s.Context(), &pb.ListRequest{}, client.WithAddress(s.Nodes...))
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if err != nil {
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return nil, err
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}
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defer stream.Close()
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var records []*store.Record
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for {
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rsp, err := stream.Recv()
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if err == io.EOF {
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break
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}
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if err != nil {
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return records, err
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}
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for _, record := range rsp.Records {
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records = append(records, &store.Record{
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Key: record.Key,
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Value: record.Value,
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Expiry: time.Duration(record.Expiry) * time.Second,
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})
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}
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}
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return records, nil
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}
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// Read a record with key
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func (s *serviceStore) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
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var options store.ReadOptions
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for _, o := range opts {
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o(&options)
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}
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rsp, err := s.Client.Read(s.Context(), &pb.ReadRequest{
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Key: key,
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Options: &pb.ReadOptions{
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Prefix: options.Prefix,
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},
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}, client.WithAddress(s.Nodes...))
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if err != nil {
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return nil, err
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}
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records := make([]*store.Record, 0, len(rsp.Records))
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for _, val := range rsp.Records {
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records = append(records, &store.Record{
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Key: val.Key,
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Value: val.Value,
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Expiry: time.Duration(val.Expiry) * time.Second,
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})
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}
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return records, nil
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}
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// Write a record
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func (s *serviceStore) Write(record *store.Record) error {
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_, err := s.Client.Write(s.Context(), &pb.WriteRequest{
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Record: &pb.Record{
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Key: record.Key,
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Value: record.Value,
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Expiry: int64(record.Expiry.Seconds()),
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},
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}, client.WithAddress(s.Nodes...))
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return err
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}
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// Delete a record with key
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func (s *serviceStore) Delete(key string) error {
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_, err := s.Client.Delete(s.Context(), &pb.DeleteRequest{
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Key: key,
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}, client.WithAddress(s.Nodes...))
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return err
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}
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func (s *serviceStore) String() string {
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return "service"
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}
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// NewStore returns a new store service implementation
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func NewStore(opts ...store.Option) store.Store {
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var options store.Options
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for _, o := range opts {
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o(&options)
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}
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service := &serviceStore{
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options: options,
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Namespace: options.Namespace,
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Prefix: options.Prefix,
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Nodes: options.Nodes,
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Client: pb.NewStoreService("go.micro.store", client.DefaultClient),
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}
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return service
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}
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