121 lines
2.3 KiB
Go
121 lines
2.3 KiB
Go
package file
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"github.com/imdario/mergo"
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"github.com/unistack-org/micro/v3/codec"
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"github.com/unistack-org/micro/v3/config"
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rutil "github.com/unistack-org/micro/v3/util/reflect"
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)
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var (
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DefaultStructTag = "file"
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ErrPathNotExist = errors.New("path is not exist")
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)
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type fileConfig struct {
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opts config.Options
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path string
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}
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func (c *fileConfig) Options() config.Options {
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return c.opts
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}
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func (c *fileConfig) Init(opts ...config.Option) error {
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for _, o := range opts {
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o(&c.opts)
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}
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path := ""
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if c.opts.Context != nil {
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if v, ok := c.opts.Context.Value(pathKey{}).(string); ok {
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path = v
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}
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}
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if path == "" {
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return ErrPathNotExist
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}
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c.path = path
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return nil
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}
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func (c *fileConfig) Load(ctx context.Context) error {
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for _, fn := range c.opts.BeforeLoad {
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if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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}
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fp, err := os.OpenFile(c.path, os.O_RDONLY, os.FileMode(0400))
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if err != nil && !c.opts.AllowFail {
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return fmt.Errorf("failed to open: %s, error: %w", c.path, ErrPathNotExist)
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} else if err == nil {
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defer fp.Close()
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var buf []byte
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buf, err = ioutil.ReadAll(io.LimitReader(fp, int64(codec.DefaultMaxMsgSize)))
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if err == nil {
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src, err := rutil.Zero(c.opts.Struct)
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if err == nil {
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err = c.opts.Codec.Unmarshal(buf, src)
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if err == nil {
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err = mergo.Merge(c.opts.Struct, src, mergo.WithOverride, mergo.WithTypeCheck, mergo.WithAppendSlice)
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}
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}
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}
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if err != nil && !c.opts.AllowFail {
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return err
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}
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}
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for _, fn := range c.opts.AfterLoad {
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if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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}
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return nil
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}
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func (c *fileConfig) Save(ctx context.Context) error {
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for _, fn := range c.opts.BeforeSave {
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if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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}
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for _, fn := range c.opts.AfterSave {
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if err := fn(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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}
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return nil
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}
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func (c *fileConfig) String() string {
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return "file"
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}
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func (c *fileConfig) Name() string {
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return c.opts.Name
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}
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func NewConfig(opts ...config.Option) config.Config {
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options := config.NewOptions(opts...)
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if len(options.StructTag) == 0 {
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options.StructTag = DefaultStructTag
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}
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return &fileConfig{opts: options}
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}
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