mirror of https://github.com/poanetwork/quorum.git
60 lines
1.7 KiB
Go
60 lines
1.7 KiB
Go
package xhandler
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import (
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"net/http"
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"time"
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"golang.org/x/net/context"
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)
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// CloseHandler returns a Handler, cancelling the context when the client
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// connection closes unexpectedly.
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func CloseHandler(next HandlerC) HandlerC {
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return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
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// Cancel the context if the client closes the connection
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if wcn, ok := w.(http.CloseNotifier); ok {
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var cancel context.CancelFunc
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ctx, cancel = context.WithCancel(ctx)
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defer cancel()
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notify := wcn.CloseNotify()
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go func() {
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select {
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case <-notify:
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cancel()
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case <-ctx.Done():
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}
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}()
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}
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next.ServeHTTPC(ctx, w, r)
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})
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}
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// TimeoutHandler returns a Handler which adds a timeout to the context.
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//
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// Child handlers have the responsability of obeying the context deadline and to return
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// an appropriate error (or not) response in case of timeout.
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func TimeoutHandler(timeout time.Duration) func(next HandlerC) HandlerC {
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return func(next HandlerC) HandlerC {
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return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
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ctx, _ = context.WithTimeout(ctx, timeout)
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next.ServeHTTPC(ctx, w, r)
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})
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}
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}
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// If is a special handler that will skip insert the condNext handler only if a condition
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// applies at runtime.
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func If(cond func(ctx context.Context, w http.ResponseWriter, r *http.Request) bool, condNext func(next HandlerC) HandlerC) func(next HandlerC) HandlerC {
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return func(next HandlerC) HandlerC {
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return HandlerFuncC(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
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if cond(ctx, w, r) {
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condNext(next).ServeHTTPC(ctx, w, r)
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} else {
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next.ServeHTTPC(ctx, w, r)
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}
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})
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}
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}
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