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events-controller.go
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events-controller.go
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package gen
import (
"context"
"fmt"
"net/url"
"os"
"strings"
"github.com/rs/zerolog/log"
cloudevents "github.com/cloudevents/sdk-go"
"github.com/cloudevents/sdk-go/pkg/cloudevents/transport"
cloudeventsaws "github.com/loopcontext/cloudevents-aws-transport"
"github.com/loopcontext/go-graphql-orm/events"
)
const (
// ORMChangeEvent ...
ORMChangeEvent = "com.graphql.orm.change"
)
// EventController ...
type EventController struct {
clients map[string]cloudevents.Client
debug bool
source string
}
// NewEventController ...
func NewEventController() (ec EventController, err error) {
source := os.Getenv("EVENT_TRANSPORT_SOURCE")
if source == "" {
hostname, _err := os.Hostname()
if err != nil {
err = _err
return
}
source = "http://" + hostname + "/graphql"
}
URLs := getENVArray("EVENT_TRANSPORT_URL")
_clients := map[string]cloudevents.Client{}
for _, URL := range URLs {
if URL != "" {
t, tErr := transportForURL(URL)
err = tErr
if err != nil {
return
}
client, cErr := cloudevents.NewClient(t)
err = cErr
if err != nil {
return
}
log.Printf("Created cloudevents client with target %s", URL)
_clients[URL] = client
}
}
debug := os.Getenv("DEBUG") == "true"
ec = EventController{clients: _clients, debug: debug, source: source}
log.Printf("Created EventController with source %s", source)
return
}
func (c *EventController) send(ctx context.Context, e cloudevents.Event) error {
for URL, client := range c.clients {
if _, _, err := client.Send(ctx, e); err != nil {
if c.debug {
fmt.Printf("received cloudevents error %s from server %s\n", err.Error(), URL)
}
return err
}
}
return nil
}
// SendEvent ...
func (c *EventController) SendEvent(ctx context.Context, e *events.Event) (err error) {
if len(c.clients) == 0 {
return
}
event := cloudevents.NewEvent()
event.SetID(e.ID)
event.SetType(ORMChangeEvent)
event.SetSource(c.source)
event.SetTime(e.Date)
err = event.SetData(e)
if err != nil {
return
}
err = c.send(ctx, event)
return
}
func getENVArray(name string) []string {
arr := []string{}
val := os.Getenv(name)
if val != "" {
arr = append(arr, strings.Split(val, ",")...)
}
for i := 0; i < 100; i++ {
key := fmt.Sprintf("%s_%d", name, i)
sval := os.Getenv(key)
if sval != "" {
arr = append(arr, sval)
}
}
return arr
}
func transportForURL(URL string) (t transport.Transport, err error) {
if strings.HasPrefix(URL, "arn:aws:sns") {
t, err = cloudeventsaws.NewSNSTransport(URL)
return
}
if strings.HasPrefix(URL, "arn:aws:events") {
t, err = cloudeventsaws.NewEventBridgeTransport(URL)
return
}
u, err := url.Parse(URL)
if err != nil {
return
}
switch u.Scheme {
case "http", "https":
t, err = cloudevents.NewHTTPTransport(
cloudevents.WithTarget(URL),
cloudevents.WithBinaryEncoding(),
)
case "sqs+https":
u.Scheme = "https"
t, err = cloudeventsaws.NewSQSTransport(u.String())
default:
err = fmt.Errorf("unknown scheme %s", u.Scheme)
}
return
}