214 lines
6.5 KiB
Go
214 lines
6.5 KiB
Go
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// 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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"reflect"
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"go.uber.org/dig/internal/digerror"
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"go.uber.org/dig/internal/digreflect"
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"go.uber.org/dig/internal/dot"
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)
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// constructorNode is a node in the dependency graph that represents
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// a constructor provided by the user.
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//
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// constructorNodes can produce zero or more values that they store into the container.
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// For the Provide path, we verify that constructorNodes produce at least one value,
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// otherwise the function will never be called.
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type constructorNode struct {
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ctor interface{}
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ctype reflect.Type
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// Location where this function was defined.
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location *digreflect.Func
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// id uniquely identifies the constructor that produces a node.
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id dot.CtorID
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// Whether the constructor owned by this node was already called.
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called bool
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// Type information about constructor parameters.
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paramList paramList
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// Type information about constructor results.
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resultList resultList
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// order of this node in each Scopes' graphHolders.
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orders map[*Scope]int
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// scope this node is part of
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s *Scope
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// scope this node was originally provided to.
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// This is different from s if and only if the constructor was Provided with ExportOption.
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origS *Scope
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}
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type constructorOptions struct {
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// If specified, all values produced by this constructor have the provided name
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// belong to the specified value group or implement any of the interfaces.
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ResultName string
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ResultGroup string
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ResultAs []interface{}
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Location *digreflect.Func
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}
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func newConstructorNode(ctor interface{}, s *Scope, origS *Scope, opts constructorOptions) (*constructorNode, error) {
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cval := reflect.ValueOf(ctor)
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ctype := cval.Type()
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cptr := cval.Pointer()
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params, err := newParamList(ctype, s)
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if err != nil {
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return nil, err
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}
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results, err := newResultList(
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ctype,
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resultOptions{
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Name: opts.ResultName,
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Group: opts.ResultGroup,
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As: opts.ResultAs,
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},
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)
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if err != nil {
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return nil, err
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}
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location := opts.Location
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if location == nil {
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location = digreflect.InspectFunc(ctor)
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}
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n := &constructorNode{
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ctor: ctor,
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ctype: ctype,
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location: location,
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id: dot.CtorID(cptr),
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paramList: params,
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resultList: results,
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orders: make(map[*Scope]int),
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s: s,
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origS: origS,
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}
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s.newGraphNode(n, n.orders)
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return n, nil
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}
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func (n *constructorNode) Location() *digreflect.Func { return n.location }
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func (n *constructorNode) ParamList() paramList { return n.paramList }
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func (n *constructorNode) ResultList() resultList { return n.resultList }
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func (n *constructorNode) ID() dot.CtorID { return n.id }
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func (n *constructorNode) CType() reflect.Type { return n.ctype }
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func (n *constructorNode) Order(s *Scope) int { return n.orders[s] }
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func (n *constructorNode) OrigScope() *Scope { return n.origS }
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func (n *constructorNode) String() string {
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return fmt.Sprintf("deps: %v, ctor: %v", n.paramList, n.ctype)
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}
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// Call calls this constructor if it hasn't already been called and
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// injects any values produced by it into the provided container.
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func (n *constructorNode) Call(c containerStore) error {
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if n.called {
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return nil
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}
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if err := shallowCheckDependencies(c, n.paramList); err != nil {
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return errMissingDependencies{
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Func: n.location,
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Reason: err,
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}
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}
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args, err := n.paramList.BuildList(c)
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if err != nil {
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return errArgumentsFailed{
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Func: n.location,
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Reason: err,
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}
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}
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receiver := newStagingContainerWriter()
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results := c.invoker()(reflect.ValueOf(n.ctor), args)
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if err := n.resultList.ExtractList(receiver, false /* decorating */, results); err != nil {
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return errConstructorFailed{Func: n.location, Reason: err}
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}
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// Commit the result to the original container that this constructor
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// was supplied to. The provided constructor is only used for a view of
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// the rest of the graph to instantiate the dependencies of this
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// container.
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receiver.Commit(n.s)
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n.called = true
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return nil
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}
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// stagingContainerWriter is a containerWriter that records the changes that
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// would be made to a containerWriter and defers them until Commit is called.
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type stagingContainerWriter struct {
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values map[key]reflect.Value
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groups map[key][]reflect.Value
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}
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var _ containerWriter = (*stagingContainerWriter)(nil)
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func newStagingContainerWriter() *stagingContainerWriter {
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return &stagingContainerWriter{
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values: make(map[key]reflect.Value),
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groups: make(map[key][]reflect.Value),
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}
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}
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func (sr *stagingContainerWriter) setValue(name string, t reflect.Type, v reflect.Value) {
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sr.values[key{t: t, name: name}] = v
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}
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func (sr *stagingContainerWriter) setDecoratedValue(_ string, _ reflect.Type, _ reflect.Value) {
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digerror.BugPanicf("stagingContainerWriter.setDecoratedValue must never be called")
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}
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func (sr *stagingContainerWriter) submitGroupedValue(group string, t reflect.Type, v reflect.Value) {
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k := key{t: t, group: group}
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sr.groups[k] = append(sr.groups[k], v)
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}
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func (sr *stagingContainerWriter) submitDecoratedGroupedValue(_ string, _ reflect.Type, _ reflect.Value) {
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digerror.BugPanicf("stagingContainerWriter.submitDecoratedGroupedValue must never be called")
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}
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// Commit commits the received results to the provided containerWriter.
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func (sr *stagingContainerWriter) Commit(cw containerWriter) {
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for k, v := range sr.values {
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cw.setValue(k.name, k.t, v)
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}
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for k, vs := range sr.groups {
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for _, v := range vs {
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cw.submitGroupedValue(k.group, k.t, v)
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}
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}
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}
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