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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/url"
"os"
"strconv"
"strings"
"github.com/go-kit/log/level"
"github.com/grafana/dskit/backoff"
"github.com/prometheus/common/model"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-sdk-go-v2/service/s3"
)
const (
// We use snappy-encoded protobufs over http by default.
contentType = "application/x-protobuf"
maxErrMsgLen = 1024
invalidExtraLabelsError = "Invalid value for environment variable EXTRA_LABELS. Expected a comma separated list with an even number of entries. "
)
var (
writeAddress *url.URL
username, password, extraLabelsRaw, tenantID, bearerToken string
keepStream bool
batchSize int
s3Clients map[string]*s3.Client
extraLabels model.LabelSet
skipTlsVerify bool
printLogLine bool
)
func setupArguments() {
addr := os.Getenv("WRITE_ADDRESS")
if addr == "" {
panic(errors.New("required environmental variable WRITE_ADDRESS not present, format: https://<hostname>/loki/api/v1/push"))
}
var err error
writeAddress, err = url.Parse(addr)
if err != nil {
panic(err)
}
fmt.Println("write address: ", writeAddress.String())
omitExtraLabelsPrefix := os.Getenv("OMIT_EXTRA_LABELS_PREFIX")
extraLabelsRaw = os.Getenv("EXTRA_LABELS")
extraLabels, err = parseExtraLabels(extraLabelsRaw, strings.EqualFold(omitExtraLabelsPrefix, "true"))
if err != nil {
panic(err)
}
username = os.Getenv("USERNAME")
password = os.Getenv("PASSWORD")
// If either username or password is set then both must be.
if (username != "" && password == "") || (username == "" && password != "") {
panic("both username and password must be set if either one is set")
}
bearerToken = os.Getenv("BEARER_TOKEN")
// If username and password are set, bearer token is not allowed
if username != "" && bearerToken != "" {
panic("both username and bearerToken are not allowed")
}
skipTls := os.Getenv("SKIP_TLS_VERIFY")
// Anything other than case-insensitive 'true' is treated as 'false'.
if strings.EqualFold(skipTls, "true") {
skipTlsVerify = true
}
tenantID = os.Getenv("TENANT_ID")
keep := os.Getenv("KEEP_STREAM")
// Anything other than case-insensitive 'true' is treated as 'false'.
if strings.EqualFold(keep, "true") {
keepStream = true
}
fmt.Println("keep stream: ", keepStream)
batch := os.Getenv("BATCH_SIZE")
batchSize = 131072
if batch != "" {
batchSize, _ = strconv.Atoi(batch)
}
print := os.Getenv("PRINT_LOG_LINE")
printLogLine = true
if strings.EqualFold(print, "false") {
printLogLine = false
}
s3Clients = make(map[string]*s3.Client)
}
func parseExtraLabels(extraLabelsRaw string, omitPrefix bool) (model.LabelSet, error) {
prefix := "__extra_"
if omitPrefix {
prefix = ""
}
var extractedLabels = model.LabelSet{}
extraLabelsSplit := strings.Split(extraLabelsRaw, ",")
if len(extraLabelsRaw) < 1 {
return extractedLabels, nil
}
if len(extraLabelsSplit)%2 != 0 {
return nil, fmt.Errorf(invalidExtraLabelsError)
}
for i := 0; i < len(extraLabelsSplit); i += 2 {
extractedLabels[model.LabelName(prefix+extraLabelsSplit[i])] = model.LabelValue(extraLabelsSplit[i+1])
}
err := extractedLabels.Validate()
if err != nil {
return nil, err
}
fmt.Println("extra labels:", extractedLabels)
return extractedLabels, nil
}
func applyExtraLabels(labels model.LabelSet) model.LabelSet {
return labels.Merge(extraLabels)
}
func checkEventType(ev map[string]interface{}) (interface{}, error) {
var s3Event events.S3Event
var s3TestEvent events.S3TestEvent
var cwEvent events.CloudwatchLogsEvent
var kinesisEvent events.KinesisEvent
var sqsEvent events.SQSEvent
var snsEvent events.SNSEvent
var eventBridgeEvent events.CloudWatchEvent
types := [...]interface{}{&s3Event, &s3TestEvent, &cwEvent, &kinesisEvent, &sqsEvent, &snsEvent, &eventBridgeEvent}
j, _ := json.Marshal(ev)
reader := strings.NewReader(string(j))
d := json.NewDecoder(reader)
d.DisallowUnknownFields()
for _, t := range types {
err := d.Decode(t)
if err == nil {
return t, nil
}
reader.Seek(0, 0)
}
return nil, fmt.Errorf("unknown event type!")
}
func handler(ctx context.Context, ev map[string]interface{}) error {
lvl, ok := os.LookupEnv("LOG_LEVEL")
if !ok {
lvl = "info"
}
log := NewLogger(lvl)
pClient := NewPromtailClient(&promtailClientConfig{
backoff: &backoff.Config{
MinBackoff: minBackoff,
MaxBackoff: maxBackoff,
MaxRetries: maxRetries,
},
http: &httpClientConfig{
timeout: timeout,
skipTlsVerify: skipTlsVerify,
},
}, log)
event, err := checkEventType(ev)
if err != nil {
level.Error(*pClient.log).Log("err", fmt.Errorf("invalid event: %s\n", ev))
return err
}
switch evt := event.(type) {
case *events.CloudWatchEvent:
err = processEventBridgeEvent(ctx, evt, pClient, pClient.log, processS3Event)
case *events.S3Event:
err = processS3Event(ctx, evt, pClient, pClient.log)
case *events.CloudwatchLogsEvent:
err = processCWEvent(ctx, evt, pClient)
case *events.KinesisEvent:
err = processKinesisEvent(ctx, evt, pClient)
case *events.SQSEvent:
err = processSQSEvent(ctx, evt, handler)
case *events.SNSEvent:
err = processSNSEvent(ctx, evt, handler)
// When setting up S3 Notification on a bucket, a test event is first sent, see: https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-content-structure.html
case *events.S3TestEvent:
return nil
}
if err != nil {
level.Error(*pClient.log).Log("err", fmt.Errorf("error processing event: %v", err))
}
return err
}
func main() {
setupArguments()
lambda.Start(handler)
}