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main.go
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main.go
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package main
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"os"
"os/signal"
"strconv"
"sync"
"syscall"
"time"
ce "github.com/cloudevents/sdk-go/v2"
"github.com/embano1/memlog"
"github.com/embano1/vsphere/event"
"github.com/embano1/vsphere/logger"
"github.com/kelseyhightower/envconfig"
"github.com/vmware/govmomi/vim25/types"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
)
const (
eventFormat = "vmware.vsphere.%s.v0"
pollInterval = time.Second // poll vcenter events
)
func main() {
var env envConfig
if err := envconfig.Process("", &env); err != nil {
panic("process environment variables: " + err.Error())
}
var l *zap.Logger
if env.Debug {
zapLogger, err := zap.NewDevelopment()
if err != nil {
panic("unable to create logger: " + err.Error())
}
l = zapLogger
} else {
zapLogger, err := zap.NewProduction()
if err != nil {
panic("unable to create logger: " + err.Error())
}
l = zapLogger
}
l = l.Named("eventstream")
ctx := logger.Set(context.Background(), l)
ctx, cancel := signal.NotifyContext(ctx, os.Interrupt, syscall.SIGTERM)
defer cancel()
srv, err := newServer(ctx, env.Port)
if err != nil {
l.Fatal("create server", zap.Error(err))
}
if err = run(ctx, srv); err != nil && !errors.Is(err, context.Canceled) {
l.Fatal("run server", zap.Error(err))
}
}
func run(ctx context.Context, srv *server) error {
var env envConfig
if err := envconfig.Process("", &env); err != nil {
return fmt.Errorf("process environment variables: %w", err)
}
l := logger.Get(ctx)
eg, egCtx := errgroup.WithContext(ctx)
eg.Go(func() error {
<-egCtx.Done()
// use fresh ctx to give clients time to disconnect
shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
l.Debug("stopping server", zap.Duration("timeout", shutdownTimeout))
defer cancel()
if err := srv.stop(shutdownCtx); err != nil {
l.Error("could not gracefully stop server", zap.Error(err))
}
return nil
})
var once sync.Once
eg.Go(func() error {
root := srv.vc.SOAP.ServiceContent.RootFolder
mgr := srv.vc.Events
source := srv.vc.SOAP.URL().String()
start := types.EventFilterSpecByTime{
BeginTime: types.NewTime(time.Now().UTC().Add(-5 * time.Minute)),
}
collector, err := event.NewHistoryCollector(egCtx, mgr, root, event.WithTime(&start))
if err != nil {
return fmt.Errorf("create event collector: %w", err)
}
l.Info("starting vsphere event collector", zap.Duration("begin", env.StreamBegin), zap.Duration("pollInterval", pollInterval))
ticker := time.NewTicker(pollInterval)
defer ticker.Stop()
for {
select {
case <-egCtx.Done():
return egCtx.Err()
case <-ticker.C:
events, err := collector.ReadNextEvents(egCtx, 50)
if err != nil {
return fmt.Errorf("read events: %w", err)
}
for _, e := range events {
id := e.GetEvent().Key
// set event ID as start offset
once.Do(func() {
l.Debug("initializing new log",
zap.Int32("startOffset", id),
zap.Int("maxSegmentSize", env.SegmentSize),
zap.Int("maxRecordSize", env.RecordSize),
)
if err := srv.initializeLog(egCtx, memlog.Offset(id), env.SegmentSize, env.RecordSize); err != nil {
l.Fatal("initialize log", zap.Error(err))
}
})
cevent := ce.NewEvent()
d := event.GetDetails(e)
cevent.SetSource(source)
cevent.SetID(strconv.Itoa(int(id)))
cevent.SetType(fmt.Sprintf(eventFormat, d.Type))
cevent.SetTime(e.GetEvent().CreatedTime)
if err := cevent.SetData(ce.ApplicationJSON, e); err != nil {
l.Error("set cloudevent data", zap.Error(err), zap.Any("event", e))
return fmt.Errorf("set cloudevent data: %v", err)
}
cevent.SetExtension("eventclass", d.Class)
b, err := json.Marshal(cevent)
if err != nil {
l.Error("marshal cloudevent to JSON", zap.Error(err), zap.String("event", cevent.String()))
return fmt.Errorf("marshal cloudevent to JSON: %v", err)
}
offset, err := srv.log.Write(egCtx, b)
if err != nil {
return fmt.Errorf("write to log: %w", err)
}
l.Debug("wrote cloudevent to log",
zap.Any("offset", offset),
zap.String("event", cevent.String()),
zap.Int("bytes", len(b)),
)
}
}
}
})
eg.Go(func() error {
l.Info("starting http listener", zap.Int("port", env.Port))
if err := srv.http.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
return fmt.Errorf("serve http: %w", err)
}
return nil
})
return eg.Wait()
}