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service.go
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service.go
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// Package service implements the store service interface
package service
import (
"context"
"io"
"time"
"github.com/micro/go-micro/v2/client"
"github.com/micro/go-micro/v2/metadata"
"github.com/micro/go-micro/v2/store"
pb "github.com/micro/go-micro/v2/store/service/proto"
)
type serviceStore struct {
options store.Options
// Namespace to use
Namespace string
// Addresses of the nodes
Nodes []string
// Prefix to use
Prefix string
// store service client
Client pb.StoreService
}
func (s *serviceStore) Init(opts ...store.Option) error {
for _, o := range opts {
o(&s.options)
}
s.Namespace = s.options.Namespace
s.Prefix = s.options.Prefix
s.Nodes = s.options.Nodes
return nil
}
func (s *serviceStore) Context() context.Context {
ctx := context.Background()
md := make(metadata.Metadata)
if len(s.Namespace) > 0 {
md["Micro-Namespace"] = s.Namespace
}
if len(s.Prefix) > 0 {
md["Micro-Prefix"] = s.Prefix
}
return metadata.NewContext(ctx, md)
}
// Sync all the known records
func (s *serviceStore) List() ([]*store.Record, error) {
stream, err := s.Client.List(s.Context(), &pb.ListRequest{}, client.WithAddress(s.Nodes...))
if err != nil {
return nil, err
}
defer stream.Close()
var records []*store.Record
for {
rsp, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
return records, err
}
for _, record := range rsp.Records {
records = append(records, &store.Record{
Key: record.Key,
Value: record.Value,
Expiry: time.Duration(record.Expiry) * time.Second,
})
}
}
return records, nil
}
// Read a record with key
func (s *serviceStore) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
var options store.ReadOptions
for _, o := range opts {
o(&options)
}
rsp, err := s.Client.Read(s.Context(), &pb.ReadRequest{
Key: key,
Options: &pb.ReadOptions{
Prefix: options.Prefix,
},
}, client.WithAddress(s.Nodes...))
if err != nil {
return nil, err
}
records := make([]*store.Record, 0, len(rsp.Records))
for _, val := range rsp.Records {
records = append(records, &store.Record{
Key: val.Key,
Value: val.Value,
Expiry: time.Duration(val.Expiry) * time.Second,
})
}
return records, nil
}
// Write a record
func (s *serviceStore) Write(record *store.Record) error {
_, err := s.Client.Write(s.Context(), &pb.WriteRequest{
Record: &pb.Record{
Key: record.Key,
Value: record.Value,
Expiry: int64(record.Expiry.Seconds()),
},
}, client.WithAddress(s.Nodes...))
return err
}
// Delete a record with key
func (s *serviceStore) Delete(key string) error {
_, err := s.Client.Delete(s.Context(), &pb.DeleteRequest{
Key: key,
}, client.WithAddress(s.Nodes...))
return err
}
func (s *serviceStore) String() string {
return "service"
}
// NewStore returns a new store service implementation
func NewStore(opts ...store.Option) store.Store {
var options store.Options
for _, o := range opts {
o(&options)
}
service := &serviceStore{
options: options,
Namespace: options.Namespace,
Prefix: options.Prefix,
Nodes: options.Nodes,
Client: pb.NewStoreService("go.micro.store", client.DefaultClient),
}
return service
}