265 lines
8.0 KiB
Go
265 lines
8.0 KiB
Go
// Copyright (c) 2021 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package dig
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import (
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"fmt"
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"math/rand"
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"reflect"
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"go.uber.org/dig/internal/dot"
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)
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const (
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_optionalTag = "optional"
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_nameTag = "name"
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_ignoreUnexportedTag = "ignore-unexported"
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)
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// Unique identification of an object in the graph.
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type key struct {
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t reflect.Type
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// Only one of name or group will be set.
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name string
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group string
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}
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func (k key) String() string {
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if k.name != "" {
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return fmt.Sprintf("%v[name=%q]", k.t, k.name)
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}
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if k.group != "" {
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return fmt.Sprintf("%v[group=%q]", k.t, k.group)
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}
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return k.t.String()
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}
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// Option configures a Container. It's included for future functionality;
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// currently, there are no concrete implementations.
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type Option interface {
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applyOption(*Container)
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}
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// Container is a directed acyclic graph of types and their dependencies.
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// A Container is the root Scope that represents the top-level scoped
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// directed acyclic graph of the dependencies.
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type Container struct {
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// this is the "root" Scope that represents the
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// root of the scope tree.
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scope *Scope
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}
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// containerWriter provides write access to the Container's underlying data
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// store.
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type containerWriter interface {
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// setValue sets the value with the given name and type in the container.
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// If a value with the same name and type already exists, it will be
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// overwritten.
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setValue(name string, t reflect.Type, v reflect.Value)
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// setDecoratedValue sets a decorated value with the given name and type
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// in the container. If a decorated value with the same name and type already
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// exists, it will be overwritten.
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setDecoratedValue(name string, t reflect.Type, v reflect.Value)
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// submitGroupedValue submits a value to the value group with the provided
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// name.
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submitGroupedValue(name string, t reflect.Type, v reflect.Value)
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// submitDecoratedGroupedValue submits a decorated value to the value group
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// with the provided name.
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submitDecoratedGroupedValue(name string, t reflect.Type, v reflect.Value)
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}
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// containerStore provides access to the Container's underlying data store.
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type containerStore interface {
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containerWriter
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// Adds a new graph node to the Container
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newGraphNode(w interface{}, orders map[*Scope]int)
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// Returns a slice containing all known types.
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knownTypes() []reflect.Type
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// Retrieves the value with the provided name and type, if any.
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getValue(name string, t reflect.Type) (v reflect.Value, ok bool)
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// Retrieves a decorated value with the provided name and type, if any.
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getDecoratedValue(name string, t reflect.Type) (v reflect.Value, ok bool)
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// Retrieves all values for the provided group and type.
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//
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// The order in which the values are returned is undefined.
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getValueGroup(name string, t reflect.Type) []reflect.Value
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// Retrieves all decorated values for the provided group and type, if any.
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getDecoratedValueGroup(name string, t reflect.Type) (reflect.Value, bool)
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// Returns the providers that can produce a value with the given name and
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// type.
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getValueProviders(name string, t reflect.Type) []provider
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// Returns the providers that can produce values for the given group and
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// type.
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getGroupProviders(name string, t reflect.Type) []provider
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// Returns the providers that can produce a value with the given name and
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// type across all the Scopes that are in effect of this containerStore.
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getAllValueProviders(name string, t reflect.Type) []provider
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// Returns the decorator that can decorate values for the given name and
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// type.
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getValueDecorator(name string, t reflect.Type) (decorator, bool)
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// Reutrns the decorator that can decorate values for the given group and
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// type.
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getGroupDecorator(name string, t reflect.Type) (decorator, bool)
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// Reports a list of stores (starting at this store) up to the root
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// store.
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storesToRoot() []containerStore
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createGraph() *dot.Graph
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// Returns invokerFn function to use when calling arguments.
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invoker() invokerFn
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}
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// New constructs a Container.
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func New(opts ...Option) *Container {
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s := newScope()
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c := &Container{scope: s}
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for _, opt := range opts {
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opt.applyOption(c)
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}
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return c
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}
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// DeferAcyclicVerification is an Option to override the default behavior
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// of container.Provide, deferring the dependency graph validation to no longer
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// run after each call to container.Provide. The container will instead verify
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// the graph on first `Invoke`.
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//
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// Applications adding providers to a container in a tight loop may experience
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// performance improvements by initializing the container with this option.
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func DeferAcyclicVerification() Option {
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return deferAcyclicVerificationOption{}
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}
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type deferAcyclicVerificationOption struct{}
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func (deferAcyclicVerificationOption) String() string {
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return "DeferAcyclicVerification()"
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}
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func (deferAcyclicVerificationOption) applyOption(c *Container) {
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c.scope.deferAcyclicVerification = true
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}
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// Changes the source of randomness for the container.
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//
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// This will help provide determinism during tests.
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func setRand(r *rand.Rand) Option {
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return setRandOption{r: r}
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}
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type setRandOption struct{ r *rand.Rand }
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func (o setRandOption) String() string {
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return fmt.Sprintf("setRand(%p)", o.r)
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}
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func (o setRandOption) applyOption(c *Container) {
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c.scope.rand = o.r
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}
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// DryRun is an Option which, when set to true, disables invocation of functions supplied to
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// Provide and Invoke. Use this to build no-op containers.
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func DryRun(dry bool) Option {
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return dryRunOption(dry)
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}
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type dryRunOption bool
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func (o dryRunOption) String() string {
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return fmt.Sprintf("DryRun(%v)", bool(o))
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}
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func (o dryRunOption) applyOption(c *Container) {
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if o {
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c.scope.invokerFn = dryInvoker
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} else {
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c.scope.invokerFn = defaultInvoker
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}
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}
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// invokerFn specifies how the container calls user-supplied functions.
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type invokerFn func(fn reflect.Value, args []reflect.Value) (results []reflect.Value)
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func defaultInvoker(fn reflect.Value, args []reflect.Value) []reflect.Value {
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return fn.Call(args)
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}
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// Generates zero values for results without calling the supplied function.
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func dryInvoker(fn reflect.Value, _ []reflect.Value) []reflect.Value {
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ft := fn.Type()
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results := make([]reflect.Value, ft.NumOut())
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for i := 0; i < ft.NumOut(); i++ {
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results[i] = reflect.Zero(fn.Type().Out(i))
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}
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return results
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}
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// String representation of the entire Container
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func (c *Container) String() string {
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return c.scope.String()
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}
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// Scope creates a child scope of the Container with the given name.
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func (c *Container) Scope(name string, opts ...ScopeOption) *Scope {
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return c.scope.Scope(name, opts...)
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}
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type byTypeName []reflect.Type
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func (bs byTypeName) Len() int {
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return len(bs)
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}
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func (bs byTypeName) Less(i int, j int) bool {
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return fmt.Sprint(bs[i]) < fmt.Sprint(bs[j])
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}
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func (bs byTypeName) Swap(i int, j int) {
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bs[i], bs[j] = bs[j], bs[i]
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}
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func shuffledCopy(rand *rand.Rand, items []reflect.Value) []reflect.Value {
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newItems := make([]reflect.Value, len(items))
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for i, j := range rand.Perm(len(items)) {
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newItems[i] = items[j]
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}
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return newItems
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}
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