80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
// Copyright (c) 2019 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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"bytes"
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"errors"
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"fmt"
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"io"
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"go.uber.org/dig/internal/digreflect"
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)
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type cycleErrPathEntry struct {
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Key key
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Func *digreflect.Func
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}
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type errCycleDetected struct {
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Path []cycleErrPathEntry
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scope *Scope
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}
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var _ digError = errCycleDetected{}
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func (e errCycleDetected) Error() string {
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// We get something like,
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//
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// [scope "foo"]
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// func(*bar) *foo provided by "path/to/package".NewFoo (path/to/file.go:42)
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// depends on func(*baz) *bar provided by "another/package".NewBar (somefile.go:1)
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// depends on func(*foo) baz provided by "somepackage".NewBar (anotherfile.go:2)
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// depends on func(*bar) *foo provided by "path/to/package".NewFoo (path/to/file.go:42)
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//
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b := new(bytes.Buffer)
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if name := e.scope.name; len(name) > 0 {
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fmt.Fprintf(b, "[scope %q]\n", name)
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}
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for i, entry := range e.Path {
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if i > 0 {
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b.WriteString("\n\tdepends on ")
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}
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fmt.Fprintf(b, "%v provided by %v", entry.Key, entry.Func)
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}
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return b.String()
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}
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func (e errCycleDetected) writeMessage(w io.Writer, v string) {
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fmt.Fprint(w, e.Error())
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}
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func (e errCycleDetected) Format(w fmt.State, c rune) {
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formatError(e, w, c)
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}
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// IsCycleDetected returns a boolean as to whether the provided error indicates
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// a cycle was detected in the container graph.
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func IsCycleDetected(err error) bool {
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return errors.As(err, &errCycleDetected{})
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}
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