forked from knative/eventing
/
cloudevents.go
152 lines (129 loc) · 4.36 KB
/
cloudevents.go
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/*
Copyright 2020 The Knative Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package adapter
import (
"context"
"errors"
"fmt"
cloudevents "github.com/cloudevents/sdk-go/v2"
"github.com/cloudevents/sdk-go/v2/event"
"github.com/cloudevents/sdk-go/v2/protocol"
"github.com/cloudevents/sdk-go/v2/protocol/http"
duckv1 "knative.dev/pkg/apis/duck/v1"
"knative.dev/pkg/source"
)
// NewCloudEventsClient returns a client that will apply the ceOverrides to
// outbound events and report outbound event counts.
func NewCloudEventsClient(target string, ceOverrides *duckv1.CloudEventOverrides, reporter source.StatsReporter) (cloudevents.Client, error) {
pOpts := make([]http.Option, 0)
if len(target) > 0 {
pOpts = append(pOpts, cloudevents.WithTarget(target))
}
p, err := cloudevents.NewHTTP(pOpts...)
if err != nil {
return nil, err
}
ceClient, err := cloudevents.NewClientObserved(p, cloudevents.WithTimeNow(), cloudevents.WithUUIDs())
if err != nil {
return nil, err
}
return &client{
ceClient: ceClient,
ceOverrides: ceOverrides,
reporter: reporter,
}, nil
}
type client struct {
ceClient cloudevents.Client
ceOverrides *duckv1.CloudEventOverrides
reporter source.StatsReporter
}
var _ cloudevents.Client = (*client)(nil)
// Send implements client.Send
func (c *client) Send(ctx context.Context, out event.Event) protocol.Result {
c.applyOverrides(ctx, &out)
res := c.ceClient.Send(ctx, out)
return c.reportCount(ctx, out, res)
}
// Request implements client.Request
func (c *client) Request(ctx context.Context, out event.Event) (*event.Event, protocol.Result) {
c.applyOverrides(ctx, &out)
resp, res := c.ceClient.Request(ctx, out)
return resp, c.reportCount(ctx, out, res)
}
// StartReceiver implements client.StartReceiver
func (c *client) StartReceiver(ctx context.Context, fn interface{}) error {
return errors.New("not implemented")
}
func (c *client) applyOverrides(ctx context.Context, event *cloudevents.Event) {
if c.ceOverrides != nil && c.ceOverrides.Extensions != nil {
for n, v := range c.ceOverrides.Extensions {
event.SetExtension(n, v)
}
}
}
func (c *client) reportCount(ctx context.Context, event cloudevents.Event, result protocol.Result) error {
tags := MetricTagFromContext(ctx)
reportArgs := &source.ReportArgs{
Namespace: tags.Namespace,
EventSource: event.Source(),
EventType: event.Type(),
Name: tags.Name,
ResourceGroup: tags.ResourceGroup,
}
if cloudevents.IsACK(result) {
var res *http.Result
if !cloudevents.ResultAs(result, &res) {
return fmt.Errorf("protocol.Result is not http.Result")
}
_ = c.reporter.ReportEventCount(reportArgs, res.StatusCode)
} else {
var res *http.Result
if !cloudevents.ResultAs(result, &res) {
return result
}
if rErr := c.reporter.ReportEventCount(reportArgs, res.StatusCode); rErr != nil {
// metrics is not important enough to return an error if it is setup wrong.
// So combine reporter error with ce error if not nil.
if result != nil {
result = fmt.Errorf("%w\nmetrics reporter errror: %s", result, rErr)
}
}
}
return result
}
// Metric context
type MetricTag struct {
Name string
Namespace string
ResourceGroup string
}
type metricKey struct{}
// ContextWithMetricTag returns a copy of parent context in which the
// value associated with metric key is the supplied metric tag.
func ContextWithMetricTag(ctx context.Context, metric *MetricTag) context.Context {
return context.WithValue(ctx, metricKey{}, metric)
}
// MetricTagFromContext returns the metric tag stored in context.
// Returns nil if no metric tag is set in context, or if the stored value is
// not of correct type.
func MetricTagFromContext(ctx context.Context) *MetricTag {
if metrictag, ok := ctx.Value(metricKey{}).(*MetricTag); ok {
return metrictag
}
return &MetricTag{
Name: "unknown",
Namespace: "unknown",
ResourceGroup: "unknown",
}
}