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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"
"fmt"
"io"
"reflect"
"time"
"github.com/micro/go-micro/v2/client"
"github.com/micro/go-micro/v2/errors"
"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
// The database to use
Database string
// The table to use
Table string
// Addresses of the nodes
Nodes []string
// store service client
Client pb.StoreService
}
func (s *serviceStore) Close() error {
return nil
}
func (s *serviceStore) Init(opts ...store.Option) error {
for _, o := range opts {
o(&s.options)
}
s.Database = s.options.Database
s.Table = s.options.Table
s.Nodes = s.options.Nodes
return nil
}
func (s *serviceStore) Context() context.Context {
ctx := context.Background()
md := make(metadata.Metadata)
if len(s.Database) > 0 {
md["Micro-Database"] = s.Database
}
if len(s.Table) > 0 {
md["Micro-Table"] = s.Table
}
return metadata.NewContext(ctx, md)
}
// Sync all the known records
func (s *serviceStore) List(opts ...store.ListOption) ([]string, error) {
options := store.ListOptions{
Database: s.Database,
Table: s.Table,
}
for _, o := range opts {
o(&options)
}
listOpts := &pb.ListOptions{
Database: options.Database,
Table: options.Table,
Prefix: options.Prefix,
Suffix: options.Suffix,
Limit: uint64(options.Limit),
Offset: uint64(options.Offset),
}
stream, err := s.Client.List(s.Context(), &pb.ListRequest{Options: listOpts}, client.WithAddress(s.Nodes...))
if err != nil && errors.Equal(err, errors.NotFound("", "")) {
return nil, store.ErrNotFound
} else if err != nil {
return nil, err
}
defer stream.Close()
var keys []string
for {
rsp, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
return keys, err
}
for _, key := range rsp.Keys {
keys = append(keys, key)
}
}
return keys, nil
}
// Read a record with key
func (s *serviceStore) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
options := store.ReadOptions{
Database: s.Database,
Table: s.Table,
}
for _, o := range opts {
o(&options)
}
readOpts := &pb.ReadOptions{
Database: options.Database,
Table: options.Table,
Prefix: options.Prefix,
Suffix: options.Suffix,
Limit: uint64(options.Limit),
Offset: uint64(options.Offset),
}
rsp, err := s.Client.Read(s.Context(), &pb.ReadRequest{
Key: key,
Options: readOpts,
}, client.WithAddress(s.Nodes...))
if err != nil && errors.Equal(err, errors.NotFound("", "")) {
return nil, store.ErrNotFound
} else if err != nil {
return nil, err
}
records := make([]*store.Record, 0, len(rsp.Records))
for _, val := range rsp.Records {
metadata := make(map[string]interface{})
for k, v := range val.Metadata {
switch v.Type {
// TODO: parse all types
default:
metadata[k] = v
}
}
records = append(records, &store.Record{
Key: val.Key,
Value: val.Value,
Expiry: time.Duration(val.Expiry) * time.Second,
Metadata: metadata,
})
}
return records, nil
}
// Write a record
func (s *serviceStore) Write(record *store.Record, opts ...store.WriteOption) error {
options := store.WriteOptions{
Database: s.Database,
Table: s.Table,
}
for _, o := range opts {
o(&options)
}
writeOpts := &pb.WriteOptions{
Database: options.Database,
Table: options.Table,
}
metadata := make(map[string]*pb.Field)
for k, v := range record.Metadata {
metadata[k] = &pb.Field{
Type: reflect.TypeOf(v).String(),
Value: fmt.Sprintf("%v", v),
}
}
_, err := s.Client.Write(s.Context(), &pb.WriteRequest{
Record: &pb.Record{
Key: record.Key,
Value: record.Value,
Expiry: int64(record.Expiry.Seconds()),
Metadata: metadata,
},
Options: writeOpts}, client.WithAddress(s.Nodes...))
if err != nil && errors.Equal(err, errors.NotFound("", "")) {
return store.ErrNotFound
}
return err
}
// Delete a record with key
func (s *serviceStore) Delete(key string, opts ...store.DeleteOption) error {
options := store.DeleteOptions{
Database: s.Database,
Table: s.Table,
}
for _, o := range opts {
o(&options)
}
deleteOpts := &pb.DeleteOptions{
Database: options.Database,
Table: options.Table,
}
_, err := s.Client.Delete(s.Context(), &pb.DeleteRequest{
Key: key,
Options: deleteOpts,
}, client.WithAddress(s.Nodes...))
if err != nil && errors.Equal(err, errors.NotFound("", "")) {
return store.ErrNotFound
}
return err
}
func (s *serviceStore) String() string {
return "service"
}
func (s *serviceStore) Options() store.Options {
return s.options
}
// NewStore returns a new store service implementation
func NewStore(opts ...store.Option) store.Store {
var options store.Options
for _, o := range opts {
o(&options)
}
if options.Client == nil {
options.Client = client.DefaultClient
}
service := &serviceStore{
options: options,
Database: options.Database,
Table: options.Table,
Nodes: options.Nodes,
Client: pb.NewStoreService("go.micro.store", options.Client),
}
return service
}