logmower-shipper/cmd/sender.go

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package logmower
import (
"time"
"github.com/jtagcat/util"
prom "github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"go.mongodb.org/mongo-driver/bson"
"go.uber.org/zap"
)
var (
promShipperMongoSent = promauto.NewCounter(prom.CounterOpts{
Subsystem: "shipper",
Name: "sent_count",
Help: "Log items successfully committed to mongo",
})
promShipperMongoSentError = promauto.NewCounter(prom.CounterOpts{
Subsystem: "shipper",
Name: "mongo_errors",
Help: "Errors while submitting to mongo", // TODO:
})
promShipperDropped = promauto.NewCounterVec(prom.CounterOpts{
Subsystem: "shipper",
Name: "queue_dropped",
Help: "Items ready to be sent to mongo, but dropped due to full queue",
}, []string{"filename"})
)
func init() {
promauto.NewGaugeFunc(prom.GaugeOpts{
Subsystem: "shipper",
Name: "queue_size",
Help: "Submit queue size",
}, func() float64 {
return float64(SendQueueLimit)
})
}
func (s *submitter) sender() {
promauto.NewGaugeFunc(prom.GaugeOpts{
Subsystem: "shipper",
Name: "queue_items",
Help: "Items in queue to be submitted in batch to mongo",
}, func() float64 {
return float64(len(s.sendQueue))
})
batched := make(chan []mLog)
go func() {
util.Batch(4, MaxBatchTime, s.sendQueue, batched)
}()
for {
batch, ok := <-batched
if !ok {
return
}
var batchBson []interface{} // mongo does not like typing
for _, b := range batch {
batchBson = append(batchBson, b.toBson())
}
result, err := s.db.InsertMany(mongoTimeoutCtx(s.ctx), batchBson, nil)
promShipperMongoSent.Add(float64(
len(result.InsertedIDs)))
if err != nil {
s.l.Error("mongo send returned error; TODO: add some selective retry here or something", zap.Error(err)) // TODO:
}
}
}
// when editing, also edit toBson(); all bson.D (and bson.M) uses
type mLog struct {
HostInfo HostInfo
Filename string
Offset int64 // byte offset where log entry ends at
Content string // TODO:
Time time.Time
}
// not using marshal, since it is <0.1x performance
func (l *mLog) toBson() bson.M {
return bson.M{
"host_info": l.HostInfo,
"filename": l.Filename,
"offset": l.Offset,
"content": l.Content,
"time": l.Time,
}
}