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adapter.go
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adapter.go
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/*
Copyright 2023 TriggerMesh Inc.
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 solacesource
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"time"
"go.uber.org/zap"
"pack.ag/amqp"
cloudevents "github.com/cloudevents/sdk-go/v2"
pkgadapter "knative.dev/eventing/pkg/adapter/v2"
"knative.dev/pkg/logging"
"github.com/triggermesh/triggermesh/pkg/apis/sources"
"github.com/triggermesh/triggermesh/pkg/apis/sources/v1alpha1"
)
var _ pkgadapter.Adapter = (*solacesourceAdapter)(nil)
type solacesourceAdapter struct {
ceClient cloudevents.Client
logger *zap.SugaredLogger
mt *pkgadapter.MetricTag
amqpClient *amqp.Client
queueName string
}
// NewAdapter satisfies pkgadapter.AdapterConstructor.
func NewAdapter(ctx context.Context, envAcc pkgadapter.EnvConfigAccessor, ceClient cloudevents.Client) pkgadapter.Adapter {
logger := logging.FromContext(ctx)
mt := &pkgadapter.MetricTag{
ResourceGroup: sources.CloudEventsSourceResource.String(),
Namespace: envAcc.GetNamespace(),
Name: envAcc.GetName(),
}
env := envAcc.(*envAccessor)
amqpOpts := []amqp.ConnOption{
amqp.ConnIdleTimeout(0),
}
if env.SASLEnable {
amqpOpts = append(amqpOpts, amqp.ConnSASLPlain(env.Username, env.Password))
} else {
amqpOpts = append(amqpOpts, amqp.ConnSASLAnonymous())
}
if env.TLSEnable {
tlsCfg := &tls.Config{}
if env.CA != "" {
addCAConfig(tlsCfg, env.CA)
}
if env.ClientCert != "" || env.ClientKey != "" {
if err := addTLSCerts(tlsCfg, env.ClientCert, env.ClientKey); err != nil {
logger.Panicw("Could not parse the TLS Certificates", zap.Error(err))
}
}
tlsCfg.InsecureSkipVerify = env.SkipVerify
amqpOpts = append(amqpOpts, amqp.ConnTLSConfig(tlsCfg))
}
// Create amqp Client
amqpClient, err := amqp.Dial(env.URL, amqpOpts...)
if err != nil {
logger.Panicw("Could not create the amqp client", zap.Error(err))
}
return &solacesourceAdapter{
amqpClient: amqpClient,
queueName: env.QueueName,
ceClient: ceClient,
logger: logger,
mt: mt,
}
}
func (a *solacesourceAdapter) Start(ctx context.Context) error {
a.logger.Info("Starting Solace Source Adapter")
// Open a session
session, err := a.amqpClient.NewSession()
if err != nil {
return err
}
// Create a receiver
receiver, err := session.NewReceiver(
amqp.LinkSourceAddress(a.queueName),
)
if err != nil {
return err
}
defer func() {
ctx, cancel := context.WithTimeout(ctx, 15*time.Second)
receiver.Close(ctx)
cancel()
}()
for {
// Receive message
msg, err := receiver.Receive(ctx)
if ctx.Err() != nil {
return nil
}
if err != nil {
return err
}
err = a.emitEvent(ctx, msg)
if err != nil {
return err
}
err = msg.Accept()
if err != nil {
a.logger.Panicw("Error accepting messages", zap.Error(err))
}
}
}
func (a *solacesourceAdapter) emitEvent(ctx context.Context, msg *amqp.Message) error {
event := cloudevents.NewEvent(cloudevents.VersionV1)
event.SetType(v1alpha1.SolaceSourceEventType)
event.SetSubject("solace/event")
event.SetSource(a.queueName)
event.SetID(msg.Properties.Subject)
if err := event.SetData(cloudevents.ApplicationJSON, msg.GetData()); err != nil {
return fmt.Errorf("failed to set event data: %w", err)
}
if result := a.ceClient.Send(ctx, event); !cloudevents.IsACK(result) {
return result
}
return nil
}
func addCAConfig(tlsConfig *tls.Config, caCert string) {
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM([]byte(caCert))
tlsConfig.RootCAs = caCertPool
}
func addTLSCerts(tlsConfig *tls.Config, clientCert, clientKey string) error {
cert, err := tls.X509KeyPair([]byte(clientCert), []byte(clientKey))
if err == nil {
tlsConfig.Certificates = []tls.Certificate{cert}
}
return err
}