forked from go-kratos/kratos
/
builder.go
95 lines (84 loc) · 1.85 KB
/
builder.go
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package discovery
import (
"context"
"errors"
"time"
"github.com/go-kratos/kratos/v2/log"
"github.com/go-kratos/kratos/v2/registry"
"google.golang.org/grpc/resolver"
)
const name = "discovery"
// Option is builder option.
type Option func(o *builder)
// WithLogger with builder logger.
func WithLogger(logger log.Logger) Option {
return func(b *builder) {
b.logger = logger
}
}
// WithTimeout with timeout option.
func WithTimeout(timeout time.Duration) Option {
return func(b *builder) {
b.timeout = timeout
}
}
// WithInsecure with isSecure option.
func WithInsecure(insecure bool) Option {
return func(b *builder) {
b.insecure = insecure
}
}
type builder struct {
discoverer registry.Discovery
logger log.Logger
timeout time.Duration
insecure bool
}
// NewBuilder creates a builder which is used to factory registry resolvers.
func NewBuilder(d registry.Discovery, opts ...Option) resolver.Builder {
b := &builder{
discoverer: d,
logger: log.DefaultLogger,
timeout: time.Second * 10,
insecure: false,
}
for _, o := range opts {
o(b)
}
return b
}
func (b *builder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
var (
err error
w registry.Watcher
)
done := make(chan bool, 1)
ctx, cancel := context.WithCancel(context.Background())
go func() {
w, err = b.discoverer.Watch(ctx, target.Endpoint)
close(done)
}()
select {
case <-done:
case <-time.After(b.timeout):
err = errors.New("discovery create watcher overtime")
}
if err != nil {
cancel()
return nil, err
}
r := &discoveryResolver{
w: w,
cc: cc,
ctx: ctx,
cancel: cancel,
log: log.NewHelper(b.logger),
insecure: b.insecure,
}
go r.watch()
return r, nil
}
// Scheme return scheme of discovery
func (*builder) Scheme() string {
return name
}