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// Copyright 2016 Google Inc. All rights reserved.
//
// 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 android
import (
"reflect"
"github.com/google/blueprint"
"github.com/google/blueprint/proptools"
)
// This file implements hooks that external module types can use to inject logic into existing
// module types. Each hook takes an interface as a parameter so that new methods can be added
// to the interface without breaking existing module types.
// Load hooks are run after the module's properties have been filled from the blueprint file, but
// before the module has been split into architecture variants, and before defaults modules have
// been applied.
type LoadHookContext interface {
EarlyModuleContext
AppendProperties(...interface{})
PrependProperties(...interface{})
CreateModule(ModuleFactory, ...interface{}) Module
registerScopedModuleType(name string, factory blueprint.ModuleFactory)
moduleFactories() map[string]blueprint.ModuleFactory
}
// Add a hook that will be called once the module has been loaded, i.e. its
// properties have been initialized from the Android.bp file.
//
// Consider using SetDefaultableHook to register a hook for any module that implements
// DefaultableModule as the hook is called after any defaults have been applied to the
// module which could reduce duplication and make it easier to use.
func AddLoadHook(m blueprint.Module, hook func(LoadHookContext)) {
blueprint.AddLoadHook(m, func(ctx blueprint.LoadHookContext) {
actx := &loadHookContext{
earlyModuleContext: m.(Module).base().earlyModuleContextFactory(ctx),
bp: ctx,
}
hook(actx)
})
}
type loadHookContext struct {
earlyModuleContext
bp blueprint.LoadHookContext
module Module
}
func (l *loadHookContext) moduleFactories() map[string]blueprint.ModuleFactory {
return l.bp.ModuleFactories()
}
func (l *loadHookContext) AppendProperties(props ...interface{}) {
for _, p := range props {
err := proptools.AppendMatchingProperties(l.Module().base().customizableProperties,
p, nil)
if err != nil {
if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
l.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
} else {
panic(err)
}
}
}
}
func (l *loadHookContext) PrependProperties(props ...interface{}) {
for _, p := range props {
err := proptools.PrependMatchingProperties(l.Module().base().customizableProperties,
p, nil)
if err != nil {
if propertyErr, ok := err.(*proptools.ExtendPropertyError); ok {
l.PropertyErrorf(propertyErr.Property, "%s", propertyErr.Err.Error())
} else {
panic(err)
}
}
}
}
func (l *loadHookContext) CreateModule(factory ModuleFactory, props ...interface{}) Module {
inherited := []interface{}{&l.Module().base().commonProperties}
module := l.bp.CreateModule(ModuleFactoryAdaptor(factory), append(inherited, props...)...).(Module)
if l.Module().base().variableProperties != nil && module.base().variableProperties != nil {
src := l.Module().base().variableProperties
dst := []interface{}{
module.base().variableProperties,
// Put an empty copy of the src properties into dst so that properties in src that are not in dst
// don't cause a "failed to find property to extend" error.
proptools.CloneEmptyProperties(reflect.ValueOf(src)).Interface(),
}
err := proptools.AppendMatchingProperties(dst, src, nil)
if err != nil {
panic(err)
}
}
return module
}
func (l *loadHookContext) registerScopedModuleType(name string, factory blueprint.ModuleFactory) {
l.bp.RegisterScopedModuleType(name, factory)
}
type InstallHookContext interface {
ModuleContext
Path() InstallPath
Symlink() bool
}
// Install hooks are run after a module creates a rule to install a file or symlink.
// The installed path is available from InstallHookContext.Path(), and
// InstallHookContext.Symlink() will be true if it was a symlink.
func AddInstallHook(m blueprint.Module, hook func(InstallHookContext)) {
h := &m.(Module).base().hooks
h.install = append(h.install, hook)
}
type installHookContext struct {
ModuleContext
path InstallPath
symlink bool
}
func (x *installHookContext) Path() InstallPath {
return x.path
}
func (x *installHookContext) Symlink() bool {
return x.symlink
}
func (x *hooks) runInstallHooks(ctx ModuleContext, path InstallPath, symlink bool) {
if len(x.install) > 0 {
mctx := &installHookContext{
ModuleContext: ctx,
path: path,
symlink: symlink,
}
for _, x := range x.install {
x(mctx)
if mctx.Failed() {
return
}
}
}
}
type hooks struct {
install []func(InstallHookContext)
}
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