69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
package vegeta
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import (
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"errors"
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"io/ioutil"
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"net/http"
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"time"
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)
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// Attack hits the passed Targets (http.Requests) at the rate specified for
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// duration time and then waits for all the requests to come back.
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// The results of the attack are put into the rep Reporter.
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func Attack(targets Targets, rate uint64, duration time.Duration, rep Reporter) {
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hits := make(chan *http.Request, rate*uint64((duration).Seconds()))
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defer close(hits)
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responses := make(chan *result, cap(hits))
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defer close(responses)
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go drill(rate, hits, responses) // Attack!
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for i := 0; i < cap(hits); i++ {
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hits <- targets[i%len(targets)]
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}
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// Wait for all requests to finish
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for i := 0; i < cap(responses); i++ {
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rep.add(<-responses)
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}
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}
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// result represents the metrics we want out of an http.Response
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type result struct {
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code uint64
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timestamp time.Time
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timing time.Duration
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bytesOut uint64
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bytesIn uint64
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err error
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}
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// drill loops over the passed reqs channel and executes each request.
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// It is throttled to the rate specified.
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func drill(rate uint64, reqs chan *http.Request, res chan *result) {
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throttle := time.Tick(time.Duration(1e9 / rate))
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for req := range reqs {
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<-throttle
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go hit(req, res)
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}
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}
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// hit executes the passed http.Request and puts a generated *result into res.
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// Both transport errors and unsucessfull requests (non {2xx,3xx}) are
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// considered errors which are set in the Response.
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func hit(req *http.Request, res chan *result) {
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began := time.Now()
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r, err := http.DefaultClient.Do(req)
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result := &result{
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timestamp: began,
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timing: time.Since(began),
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bytesOut: uint64(req.ContentLength),
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err: err,
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}
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if err == nil {
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result.bytesIn, result.code = uint64(r.ContentLength), uint64(r.StatusCode)
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if body, err := ioutil.ReadAll(r.Body); err != nil && result.code < 200 || result.code >= 300 {
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result.err = errors.New(string(body))
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}
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}
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res <- result
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}
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