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flow.go
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flow.go
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// Copyright (c) 2017 Northwestern Mutual.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package flow
import (
"context"
"net/http"
"github.com/Sirupsen/logrus"
"github.com/northwesternmutual/kanali/metrics"
"github.com/northwesternmutual/kanali/spec"
"github.com/northwesternmutual/kanali/tracer"
"github.com/opentracing/opentracing-go"
)
// Flow is a list of steps
type Flow []Step
// Add appends a step to a flow
func (f *Flow) Add(steps ...Step) {
for _, step := range steps {
*f = append(*f, step)
}
}
// Play executes all step in a flow in the order they were added.
func (f *Flow) Play(ctx context.Context, proxy *spec.APIProxy, metrics *metrics.Metrics, w http.ResponseWriter, r *http.Request, resp *http.Response, trace opentracing.Span) error {
logrus.Debugf("flow with %d step about to play", len(*f))
for _, step := range *f {
logrus.Debugf("playing step %s", step.GetName())
if err := step.Do(ctx, proxy, metrics, w, r, resp, trace); err != nil {
trace.SetTag(tracer.Error, true)
trace.LogKV(
"event", "error",
"error.message", err.Error(),
)
return err
}
}
return nil
}