94 lines
1.5 KiB
Go
94 lines
1.5 KiB
Go
package timeout
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import (
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"time"
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"github.com/gin-gonic/gin"
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)
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var bufPool *BufferPool
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const (
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defaultTimeout = 5 * time.Second
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)
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// New wraps a handler and aborts the process of the handler if the timeout is reached
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func New(opts ...Option) gin.HandlerFunc {
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t := &Timeout{
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timeout: defaultTimeout,
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handler: nil,
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response: defaultResponse,
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}
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// Loop through each option
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for _, opt := range opts {
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if opt == nil {
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panic("timeout Option not be nil")
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}
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// Call the option giving the instantiated
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opt(t)
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}
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if t.timeout <= 0 {
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return t.handler
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}
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bufPool = &BufferPool{}
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return func(c *gin.Context) {
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finish := make(chan struct{}, 1)
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panicChan := make(chan interface{}, 1)
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w := c.Writer
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buffer := bufPool.Get()
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tw := NewWriter(w, buffer)
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c.Writer = tw
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buffer.Reset()
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go func() {
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defer func() {
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if p := recover(); p != nil {
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panicChan <- p
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}
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}()
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t.handler(c)
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finish <- struct{}{}
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}()
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select {
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case p := <-panicChan:
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tw.FreeBuffer()
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c.Writer = w
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panic(p)
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case <-finish:
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c.Next()
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tw.mu.Lock()
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defer tw.mu.Unlock()
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dst := tw.ResponseWriter.Header()
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for k, vv := range tw.Header() {
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dst[k] = vv
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}
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if _, err := tw.ResponseWriter.Write(buffer.Bytes()); err != nil {
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panic(err)
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}
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tw.FreeBuffer()
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bufPool.Put(buffer)
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case <-time.After(t.timeout):
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c.Abort()
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tw.mu.Lock()
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defer tw.mu.Unlock()
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tw.timeout = true
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tw.FreeBuffer()
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bufPool.Put(buffer)
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c.Writer = w
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t.response(c)
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c.Writer = tw
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}
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}
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}
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