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83 lines
1.6 KiB
83 lines
1.6 KiB
package discovery
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import (
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"context"
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"time"
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"github.com/go-kratos/kratos/v2/log"
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"github.com/go-kratos/kratos/v2/registry"
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"google.golang.org/grpc/resolver"
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)
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const name = "discovery"
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// Option is builder option.
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type Option func(o *builder)
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// WithLogger with builder logger.
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func WithLogger(logger log.Logger) Option {
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return func(b *builder) {
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b.logger = logger
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}
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}
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// WithTimeout with timeout option.
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func WithTimeout(timeout time.Duration) Option {
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return func(b *builder) {
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b.timeout = timeout
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}
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}
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type builder struct {
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discoverer registry.Discovery
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logger log.Logger
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timeout time.Duration
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}
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// NewBuilder creates a builder which is used to factory registry resolvers.
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func NewBuilder(d registry.Discovery, opts ...Option) resolver.Builder {
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b := &builder{
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discoverer: d,
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logger: log.DefaultLogger,
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timeout: time.Second * 10,
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}
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for _, o := range opts {
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o(b)
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}
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return b
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}
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func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
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var (
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err error
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w registry.Watcher
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)
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done := make(chan bool, 1)
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ctx, cancel := context.WithCancel(context.Background())
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go func() {
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w, err = b.discoverer.Watch(ctx, target.Endpoint)
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close(done)
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}()
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select {
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case <-done:
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case <-time.After(b.timeout):
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}
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if err != nil {
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cancel()
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return nil, err
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}
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r := &discoveryResolver{
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w: w,
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cc: cc,
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ctx: ctx,
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cancel: cancel,
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log: log.NewHelper(b.logger),
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}
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go r.watch()
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return r, nil
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}
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// Scheme return scheme of discovery
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func (*builder) Scheme() string {
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return name
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}
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