micro-config-service/service.go
Vasiliy Tolstov cc6c4c002a update
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2021-06-21 16:00:32 +03:00

140 lines
3.0 KiB
Go

package service
import (
"context"
"fmt"
"github.com/imdario/mergo"
pbmicro "github.com/unistack-org/micro-config-service/v3/micro"
pb "github.com/unistack-org/micro-config-service/v3/proto"
"github.com/unistack-org/micro/v3/client"
"github.com/unistack-org/micro/v3/config"
rutil "github.com/unistack-org/micro/v3/util/reflect"
)
var (
DefaultStructTag = "service"
)
type serviceConfig struct {
opts config.Options
service string
client pbmicro.ConfigClient
}
func (c *serviceConfig) Options() config.Options {
return c.opts
}
func (c *serviceConfig) Init(opts ...config.Option) error {
for _, o := range opts {
o(&c.opts)
}
var cli client.Client
if c.opts.Context != nil {
if v, ok := c.opts.Context.Value(serviceKey{}).(string); ok && v != "" {
c.service = v
}
if v, ok := c.opts.Context.Value(clientKey{}).(client.Client); ok {
cli = v
}
}
if cli == nil {
return fmt.Errorf("missing Client option")
}
if c.service == "" {
return fmt.Errorf("missing Service option")
}
c.client = pbmicro.NewConfigClient(c.service, cli)
return nil
}
func (c *serviceConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
for _, fn := range c.opts.BeforeLoad {
if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
return err
}
}
rsp, err := c.client.Load(ctx, &pb.LoadRequest{Service: c.service})
if err != nil && !c.opts.AllowFail {
return fmt.Errorf("failed to load config: %w", err)
}
options := config.NewLoadOptions(opts...)
mopts := []func(*mergo.Config){mergo.WithTypeCheck}
if options.Override {
mopts = append(mopts, mergo.WithOverride)
}
if options.Append {
mopts = append(mopts, mergo.WithAppendSlice)
}
src, err := rutil.Zero(c.opts.Struct)
if err == nil {
err = c.opts.Codec.Unmarshal(rsp.Config, src)
if err == nil {
err = mergo.Merge(c.opts.Struct, src, mopts...)
}
}
if err != nil && !c.opts.AllowFail {
return err
}
for _, fn := range c.opts.AfterLoad {
if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
return err
}
}
return nil
}
func (c *serviceConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
for _, fn := range c.opts.BeforeSave {
if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
return err
}
}
buf, err := c.opts.Codec.Marshal(c.opts.Struct)
if err != nil && c.opts.AllowFail {
return nil
} else if err != nil {
return err
}
if _, err = c.client.Save(ctx, &pb.SaveRequest{Service: c.service, Config: buf}); err != nil && !c.opts.AllowFail {
return fmt.Errorf("failed to save config: %w", err)
}
for _, fn := range c.opts.AfterSave {
if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
return err
}
}
return nil
}
func (c *serviceConfig) String() string {
return "service"
}
func (c *serviceConfig) Name() string {
return c.opts.Name
}
func NewConfig(opts ...config.Option) config.Config {
options := config.NewOptions(opts...)
if len(options.StructTag) == 0 {
options.StructTag = DefaultStructTag
}
return &serviceConfig{opts: options}
}