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adapter.go
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adapter.go
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/*
Copyright 2022 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 googlecloudworkflowstarget
import (
"context"
"fmt"
"go.uber.org/zap"
cloudevents "github.com/cloudevents/sdk-go/v2"
pkgadapter "knative.dev/eventing/pkg/adapter/v2"
"knative.dev/pkg/logging"
workflows "cloud.google.com/go/workflows/apiv1beta"
executions "cloud.google.com/go/workflows/executions/apiv1beta"
"cloud.google.com/go/workflows/executions/apiv1beta/executionspb"
"google.golang.org/api/option"
"github.com/triggermesh/triggermesh/pkg/apis/targets"
"github.com/triggermesh/triggermesh/pkg/apis/targets/v1alpha1"
"github.com/triggermesh/triggermesh/pkg/metrics"
targetce "github.com/triggermesh/triggermesh/pkg/targets/adapter/cloudevents"
)
// NewTarget adapter implementation
func NewTarget(ctx context.Context, envAcc pkgadapter.EnvConfigAccessor, ceClient cloudevents.Client) pkgadapter.Adapter {
logger := logging.FromContext(ctx)
mt := &pkgadapter.MetricTag{
ResourceGroup: targets.GoogleCloudWorkflowsTargetResource.String(),
Namespace: envAcc.GetNamespace(),
Name: envAcc.GetName(),
}
metrics.MustRegisterEventProcessingStatsView()
env := envAcc.(*envAccessor)
opts := make([]option.ClientOption, 0)
if env.ServiceAccountKey != nil {
opts = append(opts, option.WithCredentialsJSON(env.ServiceAccountKey))
}
client, err := workflows.NewClient(ctx, opts...)
if err != nil {
logger.Panicf("Failed to create client: %v", err)
}
eClient, err := executions.NewClient(ctx, opts...)
if err != nil {
logger.Panicf("Failed to create client: %v", err)
}
replier, err := targetce.New(env.Component, logger.Named("replier"),
targetce.ReplierWithStatefulHeaders(env.BridgeIdentifier),
targetce.ReplierWithStaticResponseType(v1alpha1.EventTypeGoogleCloudWorkflowsRunResponse),
targetce.ReplierWithPayloadPolicy(targetce.PayloadPolicy(env.CloudEventPayloadPolicy)))
if err != nil {
logger.Panicf("Error creating CloudEvents replier: %v", err)
}
return &googlecloudworkflowsAdapter{
client: client,
eClient: eClient,
replier: replier,
ceClient: ceClient,
logger: logger,
sr: metrics.MustNewEventProcessingStatsReporter(mt),
}
}
var _ pkgadapter.Adapter = (*googlecloudworkflowsAdapter)(nil)
type googlecloudworkflowsAdapter struct {
client *workflows.Client
eClient *executions.Client
replier *targetce.Replier
ceClient cloudevents.Client
logger *zap.SugaredLogger
sr *metrics.EventProcessingStatsReporter
}
// Returns if stopCh is closed or Send() returns an error.
func (a *googlecloudworkflowsAdapter) Start(ctx context.Context) error {
a.logger.Info("Starting Google Cloud Workflows Adapter")
return a.ceClient.StartReceiver(ctx, a.dispatch)
}
func (a *googlecloudworkflowsAdapter) dispatch(ctx context.Context, event cloudevents.Event) (*cloudevents.Event, cloudevents.Result) {
switch typ := event.Type(); typ {
case v1alpha1.EventTypeGoogleCloudWorkflowsRun:
return a.runWorkflow(ctx, event)
default:
return a.replier.Error(&event, targetce.ErrorCodeEventContext, fmt.Errorf("event type %q is not supported", typ), nil)
}
}
func (a *googlecloudworkflowsAdapter) runWorkflow(ctx context.Context, event cloudevents.Event) (*cloudevents.Event, cloudevents.Result) {
rjp := &RunJobEvent{}
if err := event.DataAs(rjp); err != nil {
return a.replier.Error(&event, targetce.ErrorCodeRequestParsing, err, nil)
}
req := &executionspb.CreateExecutionRequest{
Parent: rjp.Parent,
Execution: &executionspb.Execution{
Name: rjp.ExecutionName,
Argument: rjp.Argument,
},
}
resp, err := a.eClient.CreateExecution(ctx, req)
if err != nil {
return nil, err
}
return a.replier.Ok(&event, resp)
}