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config.go
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config.go
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package main
import (
"bytes"
"fmt"
"net/url"
"os"
"strconv"
"strings"
"time"
"github.com/cortexproject/cortex/pkg/util"
"github.com/cortexproject/cortex/pkg/util/flagext"
"github.com/docker/docker/daemon/logger"
"github.com/docker/docker/daemon/logger/templates"
"github.com/grafana/loki/pkg/helpers"
"github.com/grafana/loki/pkg/logentry/stages"
"github.com/grafana/loki/pkg/promtail/client"
"github.com/grafana/loki/pkg/promtail/targets"
"github.com/prometheus/common/model"
)
const (
driverName = "loki"
cfgExternalLabelsKey = "loki-external-labels"
cfgURLKey = "loki-url"
cfgTLSCAFileKey = "loki-tls-ca-file"
cfgTLSCertFileKey = "loki-tls-cert-file"
cfgTLSKeyFileKey = "loki-tls-key-file"
cfgTLSServerNameKey = "loki-tls-server-name"
cfgTLSInsecure = "loki-tls-insecure-skip-verify"
cfgProxyURLKey = "loki-proxy-url"
cfgTimeoutKey = "loki-timeout"
cfgBatchWaitKey = "loki-batch-wait"
cfgBatchSizeKey = "loki-batch-size"
cfgMinBackoffKey = "loki-min-backoff"
cfgMaxBackoffKey = "loki-max-backoff"
cfgMaxRetriesKey = "loki-retries"
cfgPipelineStagesKey = "loki-pipeline-stage-file"
swarmServiceLabelKey = "com.docker.swarm.service.name"
swarmStackLabelKey = "com.docker.stack.namespace"
swarmServiceLabelName = "swarm_service"
swarmStackLabelName = "swarm_stack"
defaultExternalLabels = "container_name={{.Name}}"
defaultHostLabelName = model.LabelName("host")
)
var (
defaultClientConfig = client.Config{
BatchWait: 1 * time.Second,
BatchSize: 100 * 1024,
BackoffConfig: util.BackoffConfig{
MinBackoff: 100 * time.Millisecond,
MaxBackoff: 10 * time.Second,
MaxRetries: 10,
},
Timeout: 10 * time.Second,
}
)
type config struct {
labels model.LabelSet
clientConfig client.Config
pipeline PipelineConfig
}
type PipelineConfig struct {
PipelineStages stages.PipelineStages `yaml:"pipeline_stages,omitempty"`
}
func validateDriverOpt(loggerInfo logger.Info) error {
config := loggerInfo.Config
for opt := range config {
switch opt {
case cfgURLKey:
case cfgExternalLabelsKey:
case cfgTLSCAFileKey:
case cfgTLSCertFileKey:
case cfgTLSKeyFileKey:
case cfgTLSServerNameKey:
case cfgTLSInsecure:
case cfgTimeoutKey:
case cfgProxyURLKey:
case cfgBatchWaitKey:
case cfgBatchSizeKey:
case cfgMinBackoffKey:
case cfgMaxBackoffKey:
case cfgMaxRetriesKey:
case cfgPipelineStagesKey:
case "labels":
case "env":
case "env-regex":
default:
return fmt.Errorf("%s: wrong log-opt: '%s' - %s", driverName, opt, loggerInfo.ContainerID)
}
}
_, ok := config[cfgURLKey]
if !ok {
return fmt.Errorf("%s: %s is required in the config", driverName, cfgURLKey)
}
return nil
}
func parseConfig(logCtx logger.Info) (*config, error) {
if err := validateDriverOpt(logCtx); err != nil {
return nil, err
}
clientConfig := defaultClientConfig
labels := model.LabelSet{}
// parse URL
rawURL, ok := logCtx.Config[cfgURLKey]
if !ok {
return nil, fmt.Errorf("%s: option %s is required", driverName, cfgURLKey)
}
url, err := url.Parse(rawURL)
if err != nil {
return nil, fmt.Errorf("%s: option %s is invalid %s", driverName, cfgURLKey, err)
}
clientConfig.URL = flagext.URLValue{URL: url}
// parse timeout
if err := parseDuration(cfgTimeoutKey, logCtx, func(d time.Duration) { clientConfig.Timeout = d }); err != nil {
return nil, err
}
// parse batch wait and batch size
if err := parseDuration(cfgBatchWaitKey, logCtx, func(d time.Duration) { clientConfig.BatchWait = d }); err != nil {
return nil, err
}
if err := parseInt(cfgBatchSizeKey, logCtx, func(i int) { clientConfig.BatchSize = i }); err != nil {
return nil, err
}
// parse backoff
if err := parseDuration(cfgMinBackoffKey, logCtx, func(d time.Duration) { clientConfig.BackoffConfig.MinBackoff = d }); err != nil {
return nil, err
}
if err := parseDuration(cfgMaxBackoffKey, logCtx, func(d time.Duration) { clientConfig.BackoffConfig.MaxBackoff = d }); err != nil {
return nil, err
}
if err := parseInt(cfgMaxRetriesKey, logCtx, func(i int) { clientConfig.BackoffConfig.MaxRetries = i }); err != nil {
return nil, err
}
// parse http & tls config
if tlsCAFile, ok := logCtx.Config[cfgTLSCAFileKey]; ok {
clientConfig.Client.TLSConfig.CAFile = tlsCAFile
}
if tlsCertFile, ok := logCtx.Config[cfgTLSCertFileKey]; ok {
clientConfig.Client.TLSConfig.CertFile = tlsCertFile
}
if tlsCertFile, ok := logCtx.Config[cfgTLSCertFileKey]; ok {
clientConfig.Client.TLSConfig.CertFile = tlsCertFile
}
if tlsKeyFile, ok := logCtx.Config[cfgTLSKeyFileKey]; ok {
clientConfig.Client.TLSConfig.KeyFile = tlsKeyFile
}
if tlsServerName, ok := logCtx.Config[cfgTLSServerNameKey]; ok {
clientConfig.Client.TLSConfig.ServerName = tlsServerName
}
if tlsInsecureSkipRaw, ok := logCtx.Config[cfgTLSInsecure]; ok {
tlsInsecureSkip, err := strconv.ParseBool(tlsInsecureSkipRaw)
if err != nil {
return nil, fmt.Errorf("%s: invalid external labels: %s", driverName, tlsInsecureSkipRaw)
}
clientConfig.Client.TLSConfig.InsecureSkipVerify = tlsInsecureSkip
}
if tlsProxyURL, ok := logCtx.Config[cfgProxyURLKey]; ok {
proxyURL, err := url.Parse(tlsProxyURL)
if err != nil {
return nil, fmt.Errorf("%s: option %s is invalid %s", driverName, cfgProxyURLKey, err)
}
clientConfig.Client.ProxyURL.URL = proxyURL
}
// parse external labels
extlbs, ok := logCtx.Config[cfgExternalLabelsKey]
if !ok {
extlbs = defaultExternalLabels
}
lvs := strings.Split(extlbs, ",")
for _, lv := range lvs {
lvparts := strings.Split(lv, "=")
if len(lvparts) != 2 {
return nil, fmt.Errorf("%s: invalid external labels: %s", driverName, extlbs)
}
labelName := model.LabelName(lvparts[0])
if !labelName.IsValid() {
return nil, fmt.Errorf("%s: invalid external label name: %s", driverName, labelName)
}
// expand the value using docker template {{.Name}}.{{.ImageName}}
value, err := expandLabelValue(logCtx, lvparts[1])
if err != nil {
return nil, fmt.Errorf("%s: could not expand label value: %s err : %s", driverName, lvparts[1], err)
}
labelValue := model.LabelValue(value)
if !labelValue.IsValid() {
return nil, fmt.Errorf("%s: invalid external label value: %s", driverName, value)
}
labels[labelName] = labelValue
}
// other labels coming from docker labels or env selected by user labels, labels-regex, env, env-regex config.
attrs, err := logCtx.ExtraAttributes(nil)
if err != nil {
return nil, err
}
// parse docker swarms labels and adds them automatically to attrs
swarmService := logCtx.ContainerLabels[swarmServiceLabelKey]
if swarmService != "" {
attrs[swarmServiceLabelName] = swarmService
}
swarmStack := logCtx.ContainerLabels[swarmStackLabelKey]
if swarmStack != "" {
attrs[swarmStackLabelName] = swarmStack
}
for key, value := range attrs {
labelName := model.LabelName(key)
if !labelName.IsValid() {
return nil, fmt.Errorf("%s: invalid label name from attribute: %s", driverName, key)
}
labelValue := model.LabelValue(value)
if !labelValue.IsValid() {
return nil, fmt.Errorf("%s: invalid label value from attribute: %s", driverName, value)
}
labels[labelName] = labelValue
}
// adds host label and filename
host, err := os.Hostname()
if err == nil {
labels[defaultHostLabelName] = model.LabelValue(host)
}
labels[targets.FilenameLabel] = model.LabelValue(logCtx.LogPath)
// parse pipeline stages
var pipeline PipelineConfig
pipelineFile, ok := logCtx.Config[cfgPipelineStagesKey]
if ok {
if err := helpers.LoadConfig(pipelineFile, &pipeline); err != nil {
return nil, fmt.Errorf("%s: error loading config file %s: %s", driverName, pipelineFile, err)
}
}
return &config{
labels: labels,
clientConfig: clientConfig,
pipeline: pipeline,
}, nil
}
func expandLabelValue(info logger.Info, defaultTemplate string) (string, error) {
tmpl, err := templates.NewParse("label_value", defaultTemplate)
if err != nil {
return "", err
}
buf := new(bytes.Buffer)
if err := tmpl.Execute(buf, &info); err != nil {
return "", err
}
return buf.String(), nil
}
func parseDuration(key string, logCtx logger.Info, set func(d time.Duration)) error {
if raw, ok := logCtx.Config[key]; ok {
val, err := time.ParseDuration(raw)
if err != nil {
return fmt.Errorf("%s: invalid option %s format: %s", driverName, key, raw)
}
set(val)
}
return nil
}
func parseInt(key string, logCtx logger.Info, set func(i int)) error {
if raw, ok := logCtx.Config[key]; ok {
val, err := strconv.Atoi(raw)
if err != nil {
return fmt.Errorf("%s: invalid option %s format: %s", driverName, key, raw)
}
set(val)
}
return nil
}