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adapter.go
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adapter.go
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package jqtransformation
import (
"context"
"encoding/json"
"github.com/itchyny/gojq"
cloudevents "github.com/cloudevents/sdk-go/v2"
"go.uber.org/zap"
pkgadapter "knative.dev/eventing/pkg/adapter/v2"
"knative.dev/pkg/logging"
"github.com/zeiss/typhoon/pkg/apis/flow"
"github.com/zeiss/typhoon/pkg/metrics"
targetce "github.com/zeiss/typhoon/pkg/targets/adapter/cloudevents"
)
// NewAdapter adapter implementation
func NewAdapter(ctx context.Context, envAcc pkgadapter.EnvConfigAccessor, ceClient cloudevents.Client) pkgadapter.Adapter {
logger := logging.FromContext(ctx)
mt := &pkgadapter.MetricTag{
ResourceGroup: flow.JQTransformationResource.String(),
Namespace: envAcc.GetNamespace(),
Name: envAcc.GetName(),
}
metrics.MustRegisterEventProcessingStatsView()
env := envAcc.(*envAccessor)
replier, err := targetce.New(env.Component, logger.Named("replier"),
targetce.ReplierWithStatefulHeaders(env.BridgeIdentifier),
targetce.ReplierWithStaticResponseType("com.zeiss.jqtransformation.error"),
targetce.ReplierWithPayloadPolicy(targetce.PayloadPolicy(env.CloudEventPayloadPolicy)))
if err != nil {
logger.Panicf("Error creating CloudEvents replier: %v", err)
}
query, err := gojq.Parse(env.Query)
if err != nil {
logger.Panicf("Error creating query: %v", err)
}
return &jqadapter{
query: query,
sink: env.Sink,
replier: replier,
ceClient: ceClient,
logger: logger,
mt: mt,
sr: metrics.MustNewEventProcessingStatsReporter(mt),
}
}
var _ pkgadapter.Adapter = (*jqadapter)(nil)
type jqadapter struct {
query *gojq.Query
sink string
replier *targetce.Replier
ceClient cloudevents.Client
logger *zap.SugaredLogger
mt *pkgadapter.MetricTag
sr *metrics.EventProcessingStatsReporter
}
// Start is a blocking function and will return if an error occurs
// or the context is cancelled.
func (a *jqadapter) Start(ctx context.Context) error {
a.logger.Info("Starting JQTransformation Adapter")
ctx = pkgadapter.ContextWithMetricTag(ctx, a.mt)
return a.ceClient.StartReceiver(ctx, a.dispatch)
}
func (a *jqadapter) dispatch(ctx context.Context, event cloudevents.Event) (*cloudevents.Event, cloudevents.Result) {
var data interface{}
var qd interface{}
if err := event.DataAs(&data); err != nil {
return a.replier.Error(&event, targetce.ErrorCodeRequestParsing, err, nil)
}
iter := a.query.Run(data)
for {
v, ok := iter.Next()
if !ok {
break
}
if err, ok := v.(error); ok {
return a.replier.Error(&event, targetce.ErrorCodeRequestParsing, err, nil)
}
qd = v
}
// Reserialize the query results for the response
bs, err := json.Marshal(&qd)
if err != nil {
return a.replier.Error(&event, targetce.ErrorCodeRequestParsing, err, nil)
}
if err := event.SetData(cloudevents.ApplicationJSON, bs); err != nil {
return a.replier.Error(&event, targetce.ErrorCodeAdapterProcess, err, nil)
}
if a.sink != "" {
if result := a.ceClient.Send(ctx, event); !cloudevents.IsACK(result) {
return a.replier.Error(&event, targetce.ErrorCodeAdapterProcess, result, "sending the cloudevent to the sink")
}
return nil, cloudevents.ResultACK
}
return &event, cloudevents.ResultACK
}