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adapters.go
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adapters.go
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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package data
import (
"context"
"fmt"
"time"
"github.com/gogo/protobuf/types"
"istio.io/istio/mixer/pkg/adapter"
)
// BuildAdapters builds a standard set of testing adapters. The supplied settings is used to override behavior.
func BuildAdapters(l *Logger, settings ...FakeAdapterSettings) map[string]*adapter.Info {
m := make(map[string]FakeAdapterSettings)
for _, setting := range settings {
m[setting.Name] = setting
}
var a = map[string]*adapter.Info{
"acheck": createFakeAdapter("acheck", m["acheck"], l, "tcheck", "thalt"),
"acheckoutput": createFakeAdapter("acheckoutput", m["acheckoutput"], l, "tcheckoutput"),
"areport": createFakeAdapter("areport", m["areport"], l, "treport"),
"aquota": createFakeAdapter("aquota", m["aquota"], l, "tquota"),
"apa": createFakeAdapter("apa", m["apa"], l, "tapa"),
}
return a
}
func createFakeAdapter(name string, s FakeAdapterSettings, l *Logger, defaultTemplates ...string) *adapter.Info {
templates := defaultTemplates
if s.SupportedTemplates != nil {
templates = s.SupportedTemplates
}
// A healthy adapter that implements the check interface. It's behavior is configurable.
return &adapter.Info{
Name: name,
DefaultConfig: &types.Struct{},
SupportedTemplates: templates,
NewBuilder: func() adapter.HandlerBuilder {
l.Write(name, "NewBuilder =>")
if s.NilBuilder {
l.WriteFormat(name, "NewBuilder <= nil")
return nil
}
l.WriteFormat(name, "NewBuilder <=")
return &FakeHandlerBuilder{
settings: s,
l: l,
}
},
}
}
// FakeEnv is a dummy implementation of adapter.Env
type FakeEnv struct {
}
// Logger is an implementation of adapter.Env.Logger.
func (f *FakeEnv) Logger() adapter.Logger { panic("should not be called") }
// ScheduleWork is an implementation of adapter.Env.ScheduleWork.
func (f *FakeEnv) ScheduleWork(fn adapter.WorkFunc) { panic("should not be called") }
// ScheduleDaemon is an implementation of adapter.Env.ScheduleDaemon.
func (f *FakeEnv) ScheduleDaemon(fn adapter.DaemonFunc) { panic("should not be called") }
var _ adapter.Env = &FakeEnv{}
// FakeHandlerBuilder is a fake of HandlerBuilder.
type FakeHandlerBuilder struct {
l *Logger
settings FakeAdapterSettings
}
// SetAdapterConfig is an implementation of HandlerBuilder.SetAdapterConfig.
func (f *FakeHandlerBuilder) SetAdapterConfig(cfg adapter.Config) {
f.l.WriteFormat(f.settings.Name, "HandlerBuilder.SetAdapterConfig => '%v'", cfg)
if f.settings.PanicAtSetAdapterConfig {
f.l.Write(f.settings.Name, "HandlerBuilder.SetAdapterConfig <= (PANIC)")
panic(f.settings.PanicData)
}
f.l.Write(f.settings.Name, "HandlerBuilder.SetAdapterConfig <=")
}
// Validate is an implementation of HandlerBuilder.Validate.
func (f *FakeHandlerBuilder) Validate() *adapter.ConfigErrors {
f.l.Write(f.settings.Name, "HandlerBuilder.Validate =>")
if f.settings.PanicAtValidate {
f.l.Write(f.settings.Name, "HandlerBuilder.Validate <= (PANIC)")
panic(f.settings.PanicData)
}
if f.settings.ErrorAtValidate {
f.l.Write(f.settings.Name, "HandlerBuilder.Validate <= (ERROR)")
errs := &adapter.ConfigErrors{}
errs = errs.Append("field", fmt.Errorf("some validation error"))
return errs
}
f.l.Write(f.settings.Name, "HandlerBuilder.Validate <= (SUCCESS)")
return nil
}
// Build is an implementation of HandlerBuilder.Build.
func (f *FakeHandlerBuilder) Build(_ context.Context, env adapter.Env) (adapter.Handler, error) {
f.l.Write(f.settings.Name, "HandlerBuilder.Build =>")
if f.settings.PanicAtBuild {
f.l.Write(f.settings.Name, "HandlerBuilder.Build <= (PANIC)")
panic(f.settings.PanicData)
}
if f.settings.ErrorAtBuild {
f.l.Write(f.settings.Name, "HandlerBuilder.Build <= (ERROR)")
return nil, fmt.Errorf("this adapter is not available at the moment, please come back later")
}
if f.settings.NilHandlerAtBuild {
f.l.Write(f.settings.Name, "HandlerBuilder.Build <= (nil)")
return nil, nil
}
handler := &FakeHandler{
settings: f.settings,
l: f.l,
closingDaemon: make(chan bool),
closingWorker: make(chan bool),
done: make(chan bool),
}
handler.refreshTicker = time.NewTicker(1 * time.Millisecond)
if f.settings.SpawnDaemon {
env.ScheduleDaemon(func() {
for {
select {
case <-handler.refreshTicker.C:
// do nothing
case <-handler.closingDaemon:
return
}
}
})
}
if f.settings.SpawnWorker {
env.ScheduleWork(func() {
for {
select {
case <-handler.refreshTicker.C:
// do nothing..
case <-handler.closingWorker:
return
}
}
})
}
f.l.Write(f.settings.Name, "HandlerBuilder.Build <= (SUCCESS)")
return handler, nil
}
var _ adapter.HandlerBuilder = &FakeHandlerBuilder{}
// FakeHandler is a fake implementation of adapter.Handler.
type FakeHandler struct {
settings FakeAdapterSettings
l *Logger
refreshTicker *time.Ticker
closingDaemon chan bool
closingWorker chan bool
done chan bool
}
// Close is an implementation of adapter.Handler.Close.
func (f *FakeHandler) Close() error {
f.l.Write(f.settings.Name, "Handler.Close =>")
if f.settings.PanicAtHandlerClose {
f.l.Write(f.settings.Name, "Handler.Close <= (PANIC)")
panic(f.settings.PanicData)
}
if f.settings.ErrorAtHandlerClose {
f.l.Write(f.settings.Name, "Handler.Close <= (ERROR)")
return fmt.Errorf("error on close")
}
if f.settings.CloseGoRoutines {
f.closingDaemon <- true
f.closingWorker <- true
close(f.closingDaemon)
close(f.closingWorker)
f.refreshTicker.Stop()
}
f.l.Write(f.settings.Name, "Handler.Close <= (SUCCESS)")
return nil
}
var _ adapter.Handler = &FakeHandler{}
// FakeAdapterSettings describes the behavior of a fake adapter.
type FakeAdapterSettings struct { // nolint: maligned
Name string
PanicAtSetAdapterConfig bool
PanicData interface{}
PanicAtValidate bool
ErrorAtValidate bool
ErrorAtBuild bool
PanicAtBuild bool
NilBuilder bool
NilHandlerAtBuild bool
ErrorAtHandlerClose bool
PanicAtHandlerClose bool
SpawnDaemon bool
SpawnWorker bool
CloseGoRoutines bool
SupportedTemplates []string
}