workpool
Import this package via code.cloudfoundry.org/workpool.
Use a WorkPool to perform units of work concurrently at a maximum rate. The worker goroutines will increase to the maximum number of workers as work requires it, and gradually decrease to 0 if unused.
A Throttler performs a specified batch of work at a given maximum rate, internally creating a WorkPool and then stopping it when done.
Reporting issues and requesting features
Please report all issues and feature requests in cloudfoundry/diego-release.
Example
type RateLimitingHandler struct {
backend http.Handler
pool *workpool.WorkPool
}
// Ensures that the backend handler never processes more than maxInFlight requests at a time
func NewRateLimitingHandler(backend http.Handler, maxInFlight int) (*RateLimitingHandler, error) {
pool, err := workpool.NewWorkPool(maxInFlight)
if err != nil {
return nil, err
}
return &RateLimitingHandler{
backend: backend,
pool: pool,
}, nil
}
func (rh *RateLimitingHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
rh.pool.Submit(func() {
rh.backend.ServeHTTP(w, req)
})
}
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