go-vcr simplifies testing by recording your HTTP interactions and
replaying them in future runs in order to provide fast, deterministic
and accurate testing of your code.
go-vcr was inspired by the VCR library for Ruby.
Install go-vcr by executing the command below:
$ go get github.com/dnaeon/go-vcr/recorderHere is a simple example of recording and replaying etcd HTTP interactions.
You can find other examples in the example directory of this
repository as well.
package main
import (
"log"
"time"
"github.com/dnaeon/go-vcr/recorder"
"github.com/coreos/etcd/client"
"golang.org/x/net/context"
)
func main() {
// Start our recorder
r, err := recorder.New("fixtures/etcd")
if err != nil {
log.Fatal(err)
}
defer r.Stop() // Make sure recorder is stopped once done with it
// Create an etcd configuration using our transport
cfg := client.Config{
Endpoints: []string{"http://127.0.0.1:2379"},
HeaderTimeoutPerRequest: time.Second,
Transport: r, // Inject as transport!
}
// Create an etcd client using the above configuration
c, err := client.New(cfg)
if err != nil {
log.Fatalf("Failed to create etcd client: %s", err)
}
// Get an example key from etcd
etcdKey := "/foo"
kapi := client.NewKeysAPI(c)
resp, err := kapi.Get(context.Background(), etcdKey, nil)
if err != nil {
log.Fatalf("Failed to get etcd key %s: %s", etcdKey, err)
}
log.Printf("Successfully retrieved etcd key %s: %s", etcdKey, resp.Node.Value)
}During replay mode, You can customize the way incoming requests are matched against the recorded request/response pairs by defining a Matcher function. For example, the following matcher will match on method, URL and body:
r, err := recorder.New("fixtures/matchers")
if err != nil {
log.Fatal(err)
}
defer r.Stop() // Make sure recorder is stopped once done with it
r.SetMatcher(func(r *http.Request, i cassette.Request) bool {
var b bytes.Buffer
if _, err := b.ReadFrom(r.Body); err != nil {
return false
}
r.Body = ioutil.NopCloser(&b)
return cassette.DefaultMatcher(r, i) && (b.String() == "" || b.String() == i.Body)
})
go-vcr is Open Source and licensed under the
BSD License
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