// function which fills all part of Heka message
func setHekaMessageFields(m plugin.MetricType, msg *message.Message) error {
mName := make([]string, 0, len(m.Namespace()))
var dimField *message.Field
var err error
// Loop on namespace elements
for _, elt := range m.Namespace() {
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Namespace %#+v",
elt))
// Dynamic element is not inserted in metric name
// but rather added to dimension field
if elt.IsDynamic() {
dimField, err = addToDimensions(dimField, elt.Name)
if err != nil {
logger.WithField("_block", "setHekaMessageFields").Error(err)
return err
}
addField(elt.Name, elt.Value, msg)
} else {
// Static element is concatenated to metric name
mName = append(mName, elt.Value)
}
}
// Processing of tags
if len(m.Tags()) > 0 {
for tag, value := range m.Tags() {
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Adding tag=%s value=%s",
tag, value))
dimField, err = addToDimensions(dimField, tag)
if err != nil {
logger.WithField("_block", "setHekaMessageFields").Error(err)
return err
}
addField(tag, value, msg)
}
}
if dimField != nil {
msg.AddField(dimField)
}
// Handle metric name
metricName := strings.Join(mName, ".")
// TODO protect access using mutex
// for potential race conditions
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Checking metric=%s",
metricName))
// Is mapping already stored
if val, ok := MetricMappings[metricName]; ok {
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Metric=%s in cache %s",
metricName, val))
metricName = val
} else {
oldMetricName := metricName
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Metric=%s not in cache",
metricName))
// Namespace handling
for kmapping, vmapping := range globalMappings.Namespace {
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Checking metric=%s against namespace %s (%s)",
metricName, kmapping, vmapping))
// Try to see if substitution changes something
newMetricName := strings.Replace(metricName, kmapping, vmapping, 1)
if strings.Compare(newMetricName, metricName) != 0 {
MetricMappings[oldMetricName] = newMetricName
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Changing metric=%s into %s",
metricName, newMetricName))
metricName = newMetricName
}
}
// Metrics handling
for kmapping, vmapping := range globalMappings.Metrics {
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Checking metric=%s against metric %s (%s)",
metricName, kmapping, vmapping))
// Try to see if substitution changes something
newMetricName := strings.Replace(metricName, kmapping, vmapping, 1)
if strings.Compare(newMetricName, metricName) != 0 {
MetricMappings[oldMetricName] = newMetricName
logger.WithField("_block", "setHekaMessageFields").Debug(
fmt.Sprintf("Changing metric=%s into %s",
metricName, newMetricName))
metricName = newMetricName
}
}
}
addField("name", metricName, msg)
addField("value", getData(m.Data()), msg)
addField("timestamp", m.Timestamp().UnixNano(), msg)
return nil
}
