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server.go
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server.go
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package main
import (
"bytes"
"context"
"encoding/json"
"fmt"
"strings"
cloudevents "github.com/cloudevents/sdk-go/v2"
v2 "github.com/cloudevents/sdk-go/v2"
"github.com/cloudevents/sdk-go/v2/client"
"github.com/kelseyhightower/envconfig"
"github.com/vmware/govmomi"
"github.com/vmware/govmomi/property"
"github.com/vmware/govmomi/vim25/mo"
"github.com/vmware/govmomi/vim25/types"
"knative.dev/pkg/logging"
)
const (
envPrefix = ""
defaultMountPath = "/var/bindings/vsphere" // filepath.Join isn't const.
)
type envConfig struct {
Port int `envconfig:"PORT" default:"8080" required:"true"`
TTL int64 `envconfig:"CACHE_TTL" default:"3600"`
VCenter string `envconfig:"VCENTER_URL" default:"" required:"true"`
Insecure bool `envconfig:"VCENTER_INSECURE" default:"false"`
SecretPath string `envconfig:"SECRET_PATH" default:"/var/bindings/vsphere" required:"true"`
Debug bool `envconfig:"DEBUG" default:"false"`
EventSuffix string `envconfig:"EVENT_SUFFIX" default:"" required:"true"`
InjectKey string `envconfig:"ALARM_KEY" default:"" required:"true"`
}
type alarmServer struct {
vcClient *govmomi.Client
ceClient client.Client
cache *cache
errCh chan error
source string
suffix string
injectKey string
}
func newAlarmServer(ctx context.Context) (*alarmServer, error) {
var env envConfig
if err := envconfig.Process(envPrefix, &env); err != nil {
return nil, fmt.Errorf("process env var: %w", err)
}
if err := validateEnv(env); err != nil {
return nil, err
}
vc, err := newSOAPClient(ctx)
if err != nil {
return nil, fmt.Errorf("create vsphere client: %w", err)
}
p, err := v2.NewHTTP(v2.WithPort(env.Port))
if err != nil {
return nil, fmt.Errorf("create cloudevents transport: %w", err)
}
ce, err := v2.NewClient(p, v2.WithTimeNow(), v2.WithUUIDs())
if err != nil {
return nil, fmt.Errorf("create cloudevents client, %w", err)
}
a := alarmServer{
vcClient: vc,
ceClient: ce,
cache: newAlarmCache(env.TTL),
source: vc.URL().String(),
suffix: fmt.Sprintf(".%s", env.EventSuffix),
injectKey: env.InjectKey,
errCh: make(chan error, 1),
}
return &a, nil
}
func (a *alarmServer) handleEvent(ctx context.Context, event v2.Event) *v2.Event {
logger := logging.FromContext(ctx)
if event.Source() == a.source && strings.Contains(event.Type(), a.suffix) {
logger.Debugw("ignoring own event", "id", event.ID(), "source", event.Source(), "type", event.Type())
return nil
}
// TODO: only JSON encoding supported
if !bytes.HasPrefix(event.Data(), []byte("{")) {
logger.Warnw("ignoring event: data is not JSON-encoded", "id", event.ID(), "type", event.Type(), "content-type", event.DataContentType())
return nil
}
var alarmEvent types.AlarmEvent
if err := event.DataAs(&alarmEvent); err != nil {
logger.Warnw("decode vcenter event: %v", err)
return nil
}
// additional check to verify it's an alarm event because decoding above might
// succeed even in case of non alarm event due to embedded Event object
if moref := alarmEvent.Alarm.Alarm; moref.Type != "" {
logger.Infow("got alarm event", "source", a.source, "type", event.Type(), "moref", moref.String())
var (
alarm mo.Alarm
found bool
)
if alarm, found = a.cache.get(moref.String()); !found {
pc := property.DefaultCollector(a.vcClient.Client)
if err := pc.RetrieveOne(ctx, moref, nil, &alarm); err != nil {
if isNotAuthenticated(err) {
// TODO: easy way terminate and restart
a.errCh <- fmt.Errorf("vsphere session not authenticated: %w", err)
return nil
}
logger.Errorf("retrieve alarm from vcenter: %v", err)
return nil
}
logger.Debugf("retrieved alarm details from vcenter: %v", alarm.Info)
logger.Debugf("adding %s to cache", moref.String())
a.cache.add(moref.String(), alarm)
} else {
logger.Debugf("retrieved alarm details from cache: %v", alarm.Info)
}
resp := cloudevents.NewEvent()
resp.SetSource(a.source)
resp.SetType(event.Type() + a.suffix)
var origEvent map[string]interface{}
err := event.DataAs(&origEvent)
if err != nil {
logger.Warnf("decode original event: %v", err)
return nil
}
// inject info into original event
origEvent[a.injectKey] = alarm.Info
b, err := json.Marshal(origEvent)
if err != nil {
logger.Errorf("marshal cloud event response data: %v", err)
return nil
}
err = resp.SetData(cloudevents.ApplicationJSON, b)
if err != nil {
logger.Errorf("set cloud event response data: %v", err)
return nil
}
logger.Debugw("returning enriched alarm event", "id", resp.ID(), "source", resp.Source(), "type", resp.Type())
return &resp
}
logger.Debugf("ignoring event: not an AlarmEvent: %s", string(event.Data()))
return nil
}
func validateEnv(env envConfig) error {
validKey := func(s string) bool {
for _, r := range s {
if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') {
return false
}
}
return true
}
if !validKey(env.InjectKey) {
return fmt.Errorf("ALARM_KEY contains non-letter characters: %s", env.InjectKey)
}
if env.TTL < 0 {
return fmt.Errorf("CACHE_TTL must be greater than 0: %d", env.TTL)
}
if strings.HasPrefix(env.EventSuffix, ".") {
return fmt.Errorf("EVEN_SUFFIX must not start with %q: %s", env.EventSuffix, ".")
}
return nil
}