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In #830, I reverted some of the code moves to make reviewing the change easier. This change adds back those moves on top of that PR. This reverts commit e4d006b9cb4eb6eede8e1ca672cb4d74f679ddf2. This reverts commit 8aa68c04a85ac15123bdbaffa70ce7dac478660e. Co-authored-by: Abhinav Gupta <abg@uber.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // Copyright (c) 2019-2021 Uber Technologies, Inc. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
|
||
| package fx | ||
|
|
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| import ( | ||
| "fmt" | ||
| "strings" | ||
|
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| "go.uber.org/fx/internal/fxreflect" | ||
| ) | ||
|
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| // Invoke registers functions that are executed eagerly on application start. | ||
| // Arguments for these invocations are built using the constructors registered | ||
| // by Provide. Passing multiple Invoke options appends the new invocations to | ||
| // the application's existing list. | ||
| // | ||
| // Unlike constructors, invocations are always executed, and they're always | ||
| // run in order. Invocations may have any number of returned values. If the | ||
| // final returned object is an error, it's assumed to be a success indicator. | ||
| // All other returned values are discarded. | ||
| // | ||
| // Typically, invoked functions take a handful of high-level objects (whose | ||
| // constructors depend on lower-level objects) and introduce them to each | ||
| // other. This kick-starts the application by forcing it to instantiate a | ||
| // variety of types. | ||
| // | ||
| // To see an invocation in use, read through the package-level example. For | ||
| // advanced features, including optional parameters and named instances, see | ||
| // the documentation of the In and Out types. | ||
| func Invoke(funcs ...interface{}) Option { | ||
| return invokeOption{ | ||
| Targets: funcs, | ||
| Stack: fxreflect.CallerStack(1, 0), | ||
| } | ||
| } | ||
|
|
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| type invokeOption struct { | ||
| Targets []interface{} | ||
| Stack fxreflect.Stack | ||
| } | ||
|
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| func (o invokeOption) apply(mod *module) { | ||
| for _, target := range o.Targets { | ||
| mod.invokes = append(mod.invokes, invoke{ | ||
| Target: target, | ||
| Stack: o.Stack, | ||
| }) | ||
| } | ||
| } | ||
|
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| func (o invokeOption) String() string { | ||
| items := make([]string, len(o.Targets)) | ||
| for i, f := range o.Targets { | ||
| items[i] = fxreflect.FuncName(f) | ||
| } | ||
| return fmt.Sprintf("fx.Invoke(%s)", strings.Join(items, ", ")) | ||
| } | ||
| func runInvoke(c container, i invoke) error { | ||
| fn := i.Target | ||
| switch fn := fn.(type) { | ||
| case Option: | ||
| return fmt.Errorf("fx.Option should be passed to fx.New directly, "+ | ||
| "not to fx.Invoke: fx.Invoke received %v from:\n%+v", | ||
| fn, i.Stack) | ||
|
|
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| case annotated: | ||
| af, err := fn.Build() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| return c.Invoke(af) | ||
| default: | ||
| return c.Invoke(fn) | ||
| } | ||
| } |
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