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86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
/*
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*
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* Copyright 2017 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Package manual defines a resolver that can be used to manually send resolved
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// addresses to ClientConn.
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package manual
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import (
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"strconv"
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"time"
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"google.golang.org/grpc/resolver"
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)
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// NewBuilderWithScheme creates a new test resolver builder with the given scheme.
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func NewBuilderWithScheme(scheme string) *Resolver {
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return &Resolver{
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scheme: scheme,
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}
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}
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// Resolver is also a resolver builder.
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// It's build() function always returns itself.
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type Resolver struct {
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scheme string
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// Fields actually belong to the resolver.
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cc resolver.ClientConn
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bootstrapState *resolver.State
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}
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// InitialState adds initial state to the resolver so that UpdateState doesn't
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// need to be explicitly called after Dial.
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func (r *Resolver) InitialState(s resolver.State) {
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r.bootstrapState = &s
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}
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// Build returns itself for Resolver, because it's both a builder and a resolver.
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func (r *Resolver) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOption) (resolver.Resolver, error) {
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r.cc = cc
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if r.bootstrapState != nil {
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r.UpdateState(*r.bootstrapState)
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}
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return r, nil
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}
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// Scheme returns the test scheme.
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func (r *Resolver) Scheme() string {
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return r.scheme
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}
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// ResolveNow is a noop for Resolver.
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func (*Resolver) ResolveNow(o resolver.ResolveNowOption) {}
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// Close is a noop for Resolver.
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func (*Resolver) Close() {}
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// UpdateState calls cc.UpdateState.
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func (r *Resolver) UpdateState(s resolver.State) {
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r.cc.UpdateState(s)
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}
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// GenerateAndRegisterManualResolver generates a random scheme and a Resolver
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// with it. It also registers this Resolver.
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// It returns the Resolver and a cleanup function to unregister it.
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func GenerateAndRegisterManualResolver() (*Resolver, func()) {
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scheme := strconv.FormatInt(time.Now().UnixNano(), 36)
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r := NewBuilderWithScheme(scheme)
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resolver.Register(r)
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return r, func() { resolver.UnregisterForTesting(scheme) }
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}
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