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resolve.go
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resolve.go
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// Copyright 2021 The searKing Author. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package resolver
import (
"context"
"fmt"
sync_ "github.com/searKing/golang/go/sync"
)
var resolverPool = sync_.LruPool{
New: func(ctx context.Context, req interface{}) (resp interface{}, err error) {
target, ok := req.(string)
if !ok {
return nil, err
}
return NewResolver(ctx, target)
},
DisableKeepAlives: false,
MaxIdleResources: sync_.DefaultLruPool.MaxIdleResources,
MaxIdleResourcesPerBucket: 1,
MaxResourcesPerBucket: sync_.DefaultLruPool.MaxResourcesPerBucket,
IdleResourceTimeout: sync_.DefaultLruPool.IdleResourceTimeout,
}
func ResolveOneAddr(ctx context.Context, target string, opts ...ResolveOneAddrOption) (Address, error) {
_, err := GetBuilderOrDefault(target)
if err != nil {
return Address{}, err
}
resolver, put, err := resolverPool.GetOrError(ctx, target)
if err != nil {
return Address{}, err
}
defer put()
if resolver, ok := resolver.(Resolver); ok {
return resolver.ResolveOneAddr(ctx, opts...)
}
return Address{}, fmt.Errorf("could not get resolver for target: %q", target)
}
func ResolveAddr(ctx context.Context, target string, opts ...ResolveAddrOption) ([]Address, error) {
_, err := GetBuilderOrDefault(target)
if err != nil {
return nil, err
}
resolver, put, err := resolverPool.GetOrError(ctx, target)
if err != nil {
return nil, err
}
defer put()
if resolver, ok := resolver.(Resolver); ok {
return resolver.ResolveAddr(ctx, opts...)
}
return nil, fmt.Errorf("could not get resolver for target: %q", target)
}
func ResolveNow(ctx context.Context, target string, opts ...ResolveNowOption) error {
_, err := GetBuilderOrDefault(target)
if err != nil {
return err
}
resolver, put, err := resolverPool.GetOrError(ctx, target)
if err != nil {
return err
}
defer put()
if resolver, ok := resolver.(Resolver); ok {
resolver.ResolveNow(ctx, opts...)
return nil
}
return fmt.Errorf("could not get resolver for target: %q", target)
}
func ResolveDone(ctx context.Context, target string, doneInfo DoneInfo, opts ...ResolveDoneOption) error {
_, err := GetBuilderOrDefault(target)
if err != nil {
return err
}
resolver, put, err := resolverPool.GetOrError(ctx, target)
if err != nil {
return err
}
defer put()
if resolver, ok := resolver.(ResolveDoneResolver); ok {
resolver.ResolveDone(ctx, doneInfo, opts...)
return nil
}
return fmt.Errorf("could not get resolver for target: %q", target)
}
func GetBuilderOrDefault(target string) (Builder, error) {
tgt := ParseTarget(target)
builder := Get(tgt.Scheme)
if builder == nil {
// If resolver builder is still nil, the parsed target's scheme is
// not registered. Fallback to default resolver and set Endpoint to
// the original target.
tgt.Scheme = GetDefaultScheme()
builder = Get(tgt.Scheme)
if builder == nil {
return nil, fmt.Errorf("could not get resolver for default scheme: %q (forgotten import?)", tgt.Scheme)
}
}
return builder, nil
}
func NewResolver(ctx context.Context, target string, opts ...BuildOption) (Resolver, error) {
tgt := ParseTarget(target)
builder := Get(tgt.Scheme)
if builder == nil {
// If resolver builder is still nil, the parsed target's scheme is
// not registered. Fallback to default resolver and set Endpoint to
// the original target.
tgt.Scheme = GetDefaultScheme()
builder = Get(tgt.Scheme)
if builder == nil {
return nil, fmt.Errorf("could not get resolver for default scheme: %q (forgotten import?)", tgt.Scheme)
}
}
return builder.Build(ctx, tgt, opts...)
}