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package publisher
import (
"fmt"
"strconv"
"github.com/aws/aws-sdk-go-v2/aws/middleware/private/metrics"
"github.com/aws/aws-sdk-go-v2/aws/middleware/private/metrics/emf"
)
// EMFPublisher is a MetricPublisher implementation that publishes metrics to stdout using EMF format.
type EMFPublisher struct {
namespace string
serializer metrics.Serializer
additionalDimensions map[string]string
}
var output = func(format string, a ...interface{}) {
fmt.Printf(format, a...)
}
// NewEMFPublisher creates a new EMFPublisher with the specified namespace and serializer.
func NewEMFPublisher(namespace string, serializer metrics.Serializer) *EMFPublisher {
return &EMFPublisher{
namespace: namespace,
serializer: serializer,
additionalDimensions: map[string]string{},
}
}
func (p *EMFPublisher) SetAdditionalDimension(key string, value string) {
p.additionalDimensions[key] = value
}
func (p *EMFPublisher) RemoveAdditionalDimension(key string) {
delete(p.additionalDimensions, key)
}
func (p *EMFPublisher) populateWithAdditionalDimensions(entry *emf.Entry) {
for k := range p.additionalDimensions {
entry.AddDimension(k, p.additionalDimensions[k])
}
}
// perRequestMetrics generates and returns the log entry for per-request metrics.
func (p *EMFPublisher) perRequestMetrics(data *metrics.MetricData) (string, error) {
entry := emf.NewEntry(p.namespace, p.serializer)
p.populateWithAdditionalDimensions(&entry)
entry.AddDimension(metrics.ServiceIDKey, data.ServiceID)
entry.AddDimension(metrics.OperationNameKey, data.OperationName)
entry.AddDimension(metrics.HTTPStatusCodeKey, strconv.Itoa(data.StatusCode))
entry.AddProperty(metrics.ClientRequestIDKey, data.ClientRequestID)
entry.AddMetric(metrics.APICallDurationKey, float64(data.APICallDuration.Nanoseconds()))
entry.AddMetric(metrics.APICallSuccessfulKey, float64(data.Success))
entry.AddMetric(metrics.MarshallingDurationKey, float64(data.MarshallingDuration.Nanoseconds()))
entry.AddMetric(metrics.EndpointResolutionDurationKey, float64(data.EndpointResolutionDuration.Nanoseconds()))
entry.AddMetric(metrics.RetryCountKey, float64(data.RetryCount))
// We only publish throughput if different then 0 to avoid polluting statistics
if data.InThroughput != 0 {
entry.AddMetric(metrics.InThroughputKey, data.InThroughput)
}
if data.OutThroughput != 0 {
entry.AddMetric(metrics.OutThroughputKey, data.OutThroughput)
}
return entry.Build()
}
// perAttemptMetrics generates and returns the log entry for per-attempt metrics.
func (p *EMFPublisher) perAttemptMetrics(data *metrics.MetricData, attemptIndex int) (string, error) {
attempt := data.Attempts[attemptIndex]
entry := emf.NewEntry(p.namespace, p.serializer)
p.populateWithAdditionalDimensions(&entry)
entry.AddDimension(metrics.ServiceIDKey, data.ServiceID)
entry.AddDimension(metrics.OperationNameKey, data.OperationName)
entry.AddDimension(metrics.HTTPStatusCodeKey, strconv.Itoa(attempt.StatusCode))
entry.AddProperty(metrics.ClientRequestIDKey, data.ClientRequestID)
entry.AddProperty(metrics.AWSExtendedRequestIDKey, attempt.ExtendedRequestID)
entry.AddProperty(metrics.AWSRequestIDKey, attempt.RequestID)
entry.AddProperty(metrics.AttemptNumberKey, attemptIndex)
entry.AddMetric(metrics.MaxConcurrencyKey, float64(attempt.MaxConcurrency))
entry.AddMetric(metrics.AvailableConcurrencyKey, float64(attempt.AvailableConcurrency))
entry.AddMetric(metrics.ConcurrencyAcquireDurationKey, float64(attempt.ConcurrencyAcquireDuration.Nanoseconds()))
entry.AddMetric(metrics.PendingConcurrencyAcquiresKey, float64(attempt.PendingConnectionAcquires))
entry.AddMetric(metrics.SigningDurationKey, float64(attempt.SigningDuration.Nanoseconds()))
entry.AddMetric(metrics.UnmarshallingDurationKey, float64(attempt.UnMarshallingDuration.Nanoseconds()))
entry.AddMetric(metrics.TimeToFirstByteKey, float64(attempt.TimeToFirstByte.Nanoseconds()))
entry.AddMetric(metrics.ServiceCallDurationKey, float64(attempt.ServiceCallDuration.Nanoseconds()))
entry.AddMetric(metrics.BackoffDelayDurationKey, float64(attempt.RetryDelay))
return entry.Build()
}
// perStreamMetrics generates and returns the log entry for per-stream metrics.
func (p *EMFPublisher) perStreamMetrics(data *metrics.MetricData) (string, error) {
entry := emf.NewEntry(p.namespace, p.serializer)
p.populateWithAdditionalDimensions(&entry)
entry.AddDimension(metrics.ServiceIDKey, data.ServiceID)
entry.AddDimension(metrics.OperationNameKey, data.OperationName)
entry.AddDimension(metrics.HTTPStatusCodeKey, strconv.Itoa(data.StatusCode))
entry.AddProperty(metrics.ClientRequestIDKey, data.ClientRequestID)
if data.Stream.Throughput > 0 {
entry.AddMetric(metrics.StreamThroughputKey, data.Stream.Throughput)
}
return entry.Build()
}
// PostRequestMetrics publishes the request metrics to stdout using EMF format.
func (p *EMFPublisher) PostRequestMetrics(data *metrics.MetricData) error {
requestMetricLogEntry, err := p.perRequestMetrics(data)
if err != nil {
output("error generating log entry for request metrics due to %s", err.Error())
} else {
output("%s\n", requestMetricLogEntry)
}
for idx := range data.Attempts {
attemptMetricLogEntry, err := p.perAttemptMetrics(data, idx)
if err != nil {
output("error generating log entry for attempt metrics due to %s", err.Error())
} else {
output("%s\n", attemptMetricLogEntry)
}
}
return nil
}
// PostStreamMetrics publishes the stream metrics to stdout using EMF format.
func (p *EMFPublisher) PostStreamMetrics(data *metrics.MetricData) error {
streamMetrics, err := p.perStreamMetrics(data)
if err != nil {
output("error generating log entry for stream metrics due to %s", err.Error())
} else {
output("%s\n", streamMetrics)
}
return nil
}
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