You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
1.9 KiB
96 lines
1.9 KiB
package discovery
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"strings"
|
|
"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 struct{}, 1)
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
go func() {
|
|
w, err = b.discoverer.Watch(ctx, strings.TrimPrefix(target.URL.Path, "/"))
|
|
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
|
|
}
|
|
|