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55 lines
1.1 KiB
55 lines
1.1 KiB
4 years ago
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package discovery
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import (
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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(o *builder) {
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o.logger = logger
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}
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}
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type builder struct {
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registry registry.Registry
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logger log.Logger
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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(r registry.Registry, opts ...Option) resolver.Builder {
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b := &builder{
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registry: r,
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logger: log.DefaultLogger,
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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 (d *builder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
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w, err := d.registry.Watch(target.Endpoint)
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if err != nil {
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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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log: log.NewHelper("grpc/resolver/discovery", d.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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func (d *builder) Scheme() string {
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return name
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}
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