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binding.go
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binding.go
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/*
Copyright 2021 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 resources
import (
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"reflect"
naming "knative.dev/eventing-rabbitmq/pkg/rabbitmqnaming"
rabbithole "github.com/michaelklishin/rabbit-hole/v2"
eventingv1 "knative.dev/eventing/pkg/apis/eventing/v1"
)
const (
DefaultManagementPort = 15672
BindingKey = "x-knative-trigger"
DLQBindingKey = "x-knative-dlq"
TriggerDLQBindingKey = "x-knative-trigger-dlq"
)
// BindingArgs are the arguments to create a Trigger's Binding to a RabbitMQ Exchange.
type BindingArgs struct {
Trigger *eventingv1.Trigger
Broker *eventingv1.Broker // only for DLQ
BindingName string
BindingKey string
RoutingKey string
SourceName string
BrokerURL string
RabbitmqManagementPort int
AdminURL string
QueueName string // only for DLQ
}
// MakeBinding declares the Binding from the Broker's Exchange to the Trigger's Queue.
func MakeBinding(transport http.RoundTripper, args *BindingArgs) error {
uri, err := url.Parse(args.BrokerURL)
if err != nil {
return fmt.Errorf("failed to parse Broker URL: %v", err)
}
host, _, err := net.SplitHostPort(uri.Host)
if err != nil {
return fmt.Errorf("failed to resolve host from Broker URL: %v", err)
}
var adminURL string
if args.AdminURL != "" {
adminURL = args.AdminURL
} else {
adminURL = fmt.Sprintf("http://%s:%d", host, managementPort(args))
}
p, _ := uri.User.Password()
c, err := rabbithole.NewClient(adminURL, uri.User.Username(), p)
if err != nil {
return fmt.Errorf("failed to create RabbitMQ Admin Client: %v", err)
}
if transport != nil {
c.SetTransport(transport)
}
queueName := naming.CreateTriggerQueueName(args.Trigger)
arguments := map[string]interface{}{
"x-match": interface{}("all"),
BindingKey: interface{}(args.Trigger.Name),
}
for key, val := range args.Trigger.Spec.Filter.Attributes {
arguments[key] = interface{}(val)
}
var existing *rabbithole.BindingInfo
bindings, err := c.ListBindings()
if err != nil {
return err
}
for _, b := range bindings {
if val, exists := b.Arguments[BindingKey]; exists && val == args.Trigger.Name {
existing = &b
break
}
}
if existing == nil || !reflect.DeepEqual(existing.Arguments, arguments) {
response, err := c.DeclareBinding("/", rabbithole.BindingInfo{
Vhost: "/",
Source: naming.BrokerExchangeName(args.Broker, false),
Destination: queueName,
DestinationType: "queue",
RoutingKey: args.RoutingKey,
Arguments: arguments,
})
if err != nil {
return fmt.Errorf("failed to declare Binding: %v", err)
}
if response.StatusCode != 201 {
responseBody, _ := ioutil.ReadAll(response.Body)
return fmt.Errorf("failed to declare Binding. Expected 201 response, but got: %d.\n%s", response.StatusCode, string(responseBody))
}
if existing != nil {
_, err = c.DeleteBinding(existing.Vhost, *existing)
if err != nil {
return fmt.Errorf("failed to delete existing Binding: %v", err)
}
}
}
return nil
}
// MakeDLQBinding declares the Binding from the Broker's DLX to the DLQ dispatchers Queue or
// from the Triggers DLX to the Triggers DLQ dispatchers queue.
func MakeDLQBinding(transport http.RoundTripper, args *BindingArgs) error {
uri, err := url.Parse(args.BrokerURL)
if err != nil {
return fmt.Errorf("failed to parse Broker URL: %v", err)
}
host, _, err := net.SplitHostPort(uri.Host)
if err != nil {
return fmt.Errorf("failed to resolve host from Broker URL: %v", err)
}
var adminURL string
if args.AdminURL != "" {
adminURL = args.AdminURL
} else {
adminURL = fmt.Sprintf("http://%s:%d", host, managementPort(args))
}
p, _ := uri.User.Password()
c, err := rabbithole.NewClient(adminURL, uri.User.Username(), p)
if err != nil {
return fmt.Errorf("failed to create RabbitMQ Admin Client: %v", err)
}
if transport != nil {
c.SetTransport(transport)
}
var bindingKey string
var bindingValue string
if args.Trigger != nil {
bindingKey = TriggerDLQBindingKey
bindingValue = args.Trigger.Name
} else {
bindingKey = BindingKey
bindingValue = args.Broker.Name
}
arguments := map[string]interface{}{
"x-match": interface{}("all"),
bindingKey: bindingValue,
}
var existing *rabbithole.BindingInfo
bindings, err := c.ListBindings()
if err != nil {
return err
}
for _, b := range bindings {
if val, exists := b.Arguments[bindingKey]; exists && val == bindingValue {
existing = &b
break
}
}
var source string
if args.Trigger != nil {
source = naming.TriggerDLXExchangeName(args.Trigger)
} else {
source = naming.BrokerExchangeName(args.Broker, true)
}
if existing == nil || !reflect.DeepEqual(existing.Arguments, arguments) {
response, err := c.DeclareBinding("/", rabbithole.BindingInfo{
Vhost: "/",
Source: source,
Destination: args.QueueName,
DestinationType: "queue",
RoutingKey: args.RoutingKey,
Arguments: arguments,
})
if err != nil {
return fmt.Errorf("failed to declare DLQ Binding: %v", err)
}
if response.StatusCode != 201 {
responseBody, _ := ioutil.ReadAll(response.Body)
return fmt.Errorf("failed to declare Binding. Expected 201 response, but got: %d.\n%s", response.StatusCode, string(responseBody))
}
if existing != nil {
_, err = c.DeleteBinding(existing.Vhost, *existing)
if err != nil {
return fmt.Errorf("failed to delete existing Binding: %v", err)
}
}
}
return nil
}
func managementPort(args *BindingArgs) int {
configuredPort := args.RabbitmqManagementPort
if configuredPort > 0 {
return configuredPort
}
return DefaultManagementPort
}