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resolver.go
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resolver.go
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package http
import (
"context"
"net/url"
"sync"
"github.com/go-warrior/pkg/log"
"github.com/go-warrior/pkg/registry"
)
// Updater is resolver nodes updater
type Updater interface {
Update(nodes []*registry.ServiceInstance)
}
// Target is resolver target
type Target struct {
Scheme string
Authority string
Endpoint string
}
func parseTarget(endpoint string) (*Target, error) {
u, err := url.Parse(endpoint)
if err != nil {
if u, err = url.Parse("http://" + endpoint); err != nil {
return nil, err
}
}
target := &Target{Scheme: u.Scheme, Authority: u.Host}
if len(u.Path) > 1 {
target.Endpoint = u.Path[1:]
}
return target, nil
}
type resolver struct {
lock sync.RWMutex
nodes []*registry.ServiceInstance
target *Target
watcher registry.Watcher
logger *log.Helper
}
func newResolver(ctx context.Context, discovery registry.Discovery, target *Target, updater Updater, block bool) (*resolver, error) {
watcher, err := discovery.Watch(ctx, target.Endpoint)
if err != nil {
return nil, err
}
r := &resolver{
target: target,
watcher: watcher,
logger: log.NewHelper(log.DefaultLogger),
}
done := make(chan error, 1)
go func() {
for {
var executed bool
services, err := watcher.Next()
if err != nil {
r.logger.Errorf("http client watch service %v got unexpected error:=%v", target, err)
if block {
select {
case done <- err:
default:
}
}
return
}
var nodes []*registry.ServiceInstance
for _, in := range services {
_, endpoint, err := parseEndpoint(in.Endpoints)
if err != nil {
r.logger.Errorf("Failed to parse (%v) discovery endpoint: %v error %v", target, in.Endpoints, err)
continue
}
if endpoint == "" {
continue
}
nodes = append(nodes, in)
}
if len(nodes) != 0 {
updater.Update(nodes)
r.lock.Lock()
r.nodes = nodes
r.lock.Unlock()
if block && !executed {
executed = true
done <- nil
}
} else {
r.logger.Warnf("[http resovler]Zero endpoint found,refused to write,ser: %s ins: %v", target.Endpoint, nodes)
}
}
}()
if block {
select {
case e := <-done:
if e != nil {
watcher.Stop()
}
return r, e
case <-ctx.Done():
r.logger.Errorf("http client watch service %v reaching context deadline!", target)
watcher.Stop()
return nil, ctx.Err()
}
}
return r, nil
}
func (r *resolver) fetch(ctx context.Context) []*registry.ServiceInstance {
r.lock.RLock()
nodes := r.nodes
r.lock.RUnlock()
return nodes
}
func parseEndpoint(endpoints []string) (string, string, error) {
for _, e := range endpoints {
u, err := url.Parse(e)
if err != nil {
return "", "", err
}
if u.Scheme == "http" {
return u.Scheme, u.Host, nil
}
}
return "", "", nil
}