micro-config-service/service.go

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package service // import "go.unistack.org/micro-config-service/v3"
import (
"context"
"fmt"
"github.com/imdario/mergo"
pbmicro "go.unistack.org/micro-config-service/v3/micro"
pb "go.unistack.org/micro-config-service/v3/proto"
"go.unistack.org/micro/v3/client"
"go.unistack.org/micro/v3/config"
rutil "go.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 {
err := fmt.Errorf("missing client option")
c.opts.Logger.Error(c.opts.Context, err)
if !c.opts.AllowFail {
return err
}
return nil
}
if c.service == "" {
err := fmt.Errorf("missing Service option")
c.opts.Logger.Error(c.opts.Context, err)
if !c.opts.AllowFail {
return err
}
return nil
}
c.client = pbmicro.NewConfigClient(c.service, cli)
return nil
}
func (c *serviceConfig) Load(ctx context.Context, opts ...config.LoadOption) error {
if err := config.DefaultBeforeLoad(ctx, c); err != nil {
return err
}
rsp, err := c.client.Load(ctx, &pb.LoadRequest{Service: c.service})
if err != nil {
c.opts.Logger.Errorf(ctx, "service load error: %v", err)
if !c.opts.AllowFail {
return fmt.Errorf("failed to load config: %w", err)
}
return config.DefaultAfterLoad(ctx, c)
}
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.Logger.Errorf(ctx, "service load error: %v", err)
if !c.opts.AllowFail {
return fmt.Errorf("failed to load config: %w", err)
}
}
if err := config.DefaultAfterLoad(ctx, c); err != nil {
return err
}
return nil
}
func (c *serviceConfig) Save(ctx context.Context, opts ...config.SaveOption) error {
if err := config.DefaultBeforeSave(ctx, c); err != nil {
return err
}
buf, err := c.opts.Codec.Marshal(c.opts.Struct)
if err == nil {
_, err = c.client.Save(ctx, &pb.SaveRequest{Service: c.service, Config: buf})
}
if err != nil {
c.opts.Logger.Errorf(ctx, "service save error: %v", err)
if !c.opts.AllowFail {
return fmt.Errorf("failed to save config: %w", err)
}
}
if err := config.DefaultAfterSave(ctx, c); err != nil {
return err
}
return nil
}
func (c *serviceConfig) String() string {
return "service"
}
func (c *serviceConfig) Name() string {
return c.opts.Name
}
func (c *serviceConfig) Watch(ctx context.Context, opts ...config.WatchOption) (config.Watcher, error) {
return nil, fmt.Errorf("not implemented")
}
func NewConfig(opts ...config.Option) config.Config {
options := config.NewOptions(opts...)
if len(options.StructTag) == 0 {
options.StructTag = DefaultStructTag
}
return &serviceConfig{opts: options}
}