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ebc479ef2c
The original signature accept a boolean, and it feel like a little verbose, since when people pass in this option, he/she always want to pass a `true`. Now if input `wg` is nil, it has same effect as passing `true` in original code. Furthermore, if user want's finer grained control during shutdown, one can pass in a predefined `wg`, so that server will wait against it during shutdown.
29 lines
469 B
Go
29 lines
469 B
Go
package server
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import (
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"context"
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"sync"
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)
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type serverKey struct{}
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func wait(ctx context.Context) *sync.WaitGroup {
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if ctx == nil {
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return nil
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}
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wg, ok := ctx.Value("wait").(*sync.WaitGroup)
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if !ok {
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return nil
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}
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return wg
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}
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func FromContext(ctx context.Context) (Server, bool) {
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c, ok := ctx.Value(serverKey{}).(Server)
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return c, ok
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}
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func NewContext(ctx context.Context, s Server) context.Context {
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return context.WithValue(ctx, serverKey{}, s)
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}
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