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This commit is contained in:
Dev
189
pkg/metrics/metrics.go
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189
pkg/metrics/metrics.go
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@@ -0,0 +1,189 @@
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package metrics
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import (
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"sort"
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"sync"
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"time"
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)
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// Collector handles metrics collection during stress testing
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type Collector struct {
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mu sync.RWMutex
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responseTimes []time.Duration
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statusCodes map[int]int64
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errors []error
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totalRequests int64
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successRequests int64
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failedRequests int64
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startTime time.Time
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}
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// Results contains aggregated test results
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type Results struct {
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TotalRequests int64
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SuccessRequests int64
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FailedRequests int64
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MinResponseTime time.Duration
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MaxResponseTime time.Duration
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AvgResponseTime time.Duration
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P50 time.Duration
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P90 time.Duration
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P95 time.Duration
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P99 time.Duration
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StatusCodes map[int]int64
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Errors []error
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TestDuration time.Duration
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RequestsPerSecond float64
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}
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// NewCollector creates a new metrics collector
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func NewCollector() *Collector {
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return &Collector{
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responseTimes: make([]time.Duration, 0),
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statusCodes: make(map[int]int64),
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errors: make([]error, 0),
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startTime: time.Now(),
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}
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}
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// RecordRequest records a single request's metrics
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func (c *Collector) RecordRequest(responseTime time.Duration, statusCode int, err error) {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.totalRequests++
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c.responseTimes = append(c.responseTimes, responseTime)
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if err != nil {
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c.failedRequests++
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c.errors = append(c.errors, err)
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} else {
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c.successRequests++
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c.statusCodes[statusCode]++
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}
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}
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// GetResults calculates and returns aggregated results
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func (c *Collector) GetResults() *Results {
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c.mu.RLock()
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defer c.mu.RUnlock()
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testDuration := time.Since(c.startTime)
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rps := float64(c.totalRequests) / testDuration.Seconds()
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if len(c.responseTimes) == 0 {
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return &Results{
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TotalRequests: c.totalRequests,
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SuccessRequests: c.successRequests,
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FailedRequests: c.failedRequests,
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StatusCodes: copyMap(c.statusCodes),
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Errors: copyErrors(c.errors),
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TestDuration: testDuration,
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RequestsPerSecond: rps,
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}
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}
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// Filter out zero response times (from errors) and sort for percentile calculations
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var validTimes []time.Duration
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for _, t := range c.responseTimes {
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if t > 0 {
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validTimes = append(validTimes, t)
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}
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}
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if len(validTimes) == 0 {
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return &Results{
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TotalRequests: c.totalRequests,
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SuccessRequests: c.successRequests,
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FailedRequests: c.failedRequests,
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StatusCodes: copyMap(c.statusCodes),
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Errors: copyErrors(c.errors),
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TestDuration: testDuration,
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RequestsPerSecond: rps,
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}
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}
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sort.Slice(validTimes, func(i, j int) bool {
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return validTimes[i] < validTimes[j]
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})
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// Calculate statistics
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minTime := validTimes[0]
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maxTime := validTimes[len(validTimes)-1]
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avgTime := calculateAverage(validTimes)
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return &Results{
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TotalRequests: c.totalRequests,
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SuccessRequests: c.successRequests,
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FailedRequests: c.failedRequests,
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MinResponseTime: minTime,
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MaxResponseTime: maxTime,
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AvgResponseTime: avgTime,
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P50: calculatePercentile(validTimes, 50),
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P90: calculatePercentile(validTimes, 90),
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P95: calculatePercentile(validTimes, 95),
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P99: calculatePercentile(validTimes, 99),
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StatusCodes: copyMap(c.statusCodes),
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Errors: copyErrors(c.errors),
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TestDuration: testDuration,
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RequestsPerSecond: rps,
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}
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}
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// Reset clears all collected metrics
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func (c *Collector) Reset() {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.responseTimes = c.responseTimes[:0]
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c.statusCodes = make(map[int]int64)
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c.errors = c.errors[:0]
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c.totalRequests = 0
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c.successRequests = 0
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c.failedRequests = 0
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c.startTime = time.Now()
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}
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// calculatePercentile calculates the nth percentile of sorted response times
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func calculatePercentile(sortedTimes []time.Duration, percentile int) time.Duration {
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if len(sortedTimes) == 0 {
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return 0
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}
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index := int(float64(len(sortedTimes)-1) * float64(percentile) / 100.0)
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if index >= len(sortedTimes) {
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index = len(sortedTimes) - 1
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}
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return sortedTimes[index]
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}
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// calculateAverage calculates the average response time
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func calculateAverage(times []time.Duration) time.Duration {
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if len(times) == 0 {
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return 0
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}
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var total time.Duration
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for _, t := range times {
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total += t
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}
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return total / time.Duration(len(times))
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}
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// copyMap creates a copy of the status codes map
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func copyMap(original map[int]int64) map[int]int64 {
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copy := make(map[int]int64)
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for k, v := range original {
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copy[k] = v
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}
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return copy
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}
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// copyErrors creates a copy of the errors slice
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func copyErrors(original []error) []error {
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copy := make([]error, len(original))
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copy = append(copy, original...)
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return copy
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}
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275
pkg/metrics/metrics_test.go
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275
pkg/metrics/metrics_test.go
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@@ -0,0 +1,275 @@
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package metrics
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import (
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"errors"
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"testing"
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"time"
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)
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func TestNewCollector(t *testing.T) {
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collector := NewCollector()
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if collector == nil {
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t.Fatal("NewCollector() returned nil")
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}
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if collector.responseTimes == nil {
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t.Error("responseTimes slice not initialized")
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}
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if collector.statusCodes == nil {
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t.Error("statusCodes map not initialized")
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}
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if collector.errors == nil {
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t.Error("errors slice not initialized")
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}
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}
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func TestRecordRequest_Success(t *testing.T) {
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collector := NewCollector()
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responseTime := 100 * time.Millisecond
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statusCode := 200
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collector.RecordRequest(responseTime, statusCode, nil)
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if collector.totalRequests != 1 {
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t.Errorf("Expected totalRequests = 1, got %d", collector.totalRequests)
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}
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if collector.successRequests != 1 {
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t.Errorf("Expected successRequests = 1, got %d", collector.successRequests)
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}
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if collector.failedRequests != 0 {
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t.Errorf("Expected failedRequests = 0, got %d", collector.failedRequests)
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}
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if len(collector.responseTimes) != 1 {
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t.Errorf("Expected 1 response time recorded, got %d", len(collector.responseTimes))
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}
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if collector.responseTimes[0] != responseTime {
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t.Errorf("Expected response time %v, got %v", responseTime, collector.responseTimes[0])
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}
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if collector.statusCodes[statusCode] != 1 {
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t.Errorf("Expected status code %d count = 1, got %d", statusCode, collector.statusCodes[statusCode])
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}
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}
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func TestRecordRequest_Error(t *testing.T) {
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collector := NewCollector()
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responseTime := 50 * time.Millisecond
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err := errors.New("connection timeout")
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collector.RecordRequest(responseTime, 0, err)
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if collector.totalRequests != 1 {
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t.Errorf("Expected totalRequests = 1, got %d", collector.totalRequests)
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}
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if collector.successRequests != 0 {
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t.Errorf("Expected successRequests = 0, got %d", collector.successRequests)
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}
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if collector.failedRequests != 1 {
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t.Errorf("Expected failedRequests = 1, got %d", collector.failedRequests)
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}
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if len(collector.errors) != 1 {
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t.Errorf("Expected 1 error recorded, got %d", len(collector.errors))
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}
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if collector.errors[0].Error() != err.Error() {
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t.Errorf("Expected error %v, got %v", err, collector.errors[0])
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}
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}
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func TestGetResults(t *testing.T) {
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collector := NewCollector()
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// Record some test data
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testData := []struct {
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responseTime time.Duration
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statusCode int
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err error
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}{
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{50 * time.Millisecond, 200, nil},
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{100 * time.Millisecond, 200, nil},
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{150 * time.Millisecond, 200, nil},
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{200 * time.Millisecond, 500, nil},
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{0, 0, errors.New("timeout")},
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}
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for _, data := range testData {
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collector.RecordRequest(data.responseTime, data.statusCode, data.err)
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}
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results := collector.GetResults()
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// Verify basic counts
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if results.TotalRequests != 5 {
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t.Errorf("Expected TotalRequests = 5, got %d", results.TotalRequests)
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}
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if results.SuccessRequests != 4 {
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t.Errorf("Expected SuccessRequests = 4, got %d", results.SuccessRequests)
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}
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if results.FailedRequests != 1 {
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t.Errorf("Expected FailedRequests = 1, got %d", results.FailedRequests)
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}
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// Verify response time statistics (excluding the error request with 0 duration)
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expectedMin := 50 * time.Millisecond
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expectedMax := 200 * time.Millisecond
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if results.MinResponseTime != expectedMin {
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t.Errorf("Expected MinResponseTime = %v, got %v", expectedMin, results.MinResponseTime)
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}
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if results.MaxResponseTime != expectedMax {
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t.Errorf("Expected MaxResponseTime = %v, got %v", expectedMax, results.MaxResponseTime)
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}
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// Verify status codes
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if results.StatusCodes[200] != 3 {
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t.Errorf("Expected status code 200 count = 3, got %d", results.StatusCodes[200])
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}
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if results.StatusCodes[500] != 1 {
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t.Errorf("Expected status code 500 count = 1, got %d", results.StatusCodes[500])
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}
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}
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func TestCalculatePercentile(t *testing.T) {
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times := []time.Duration{
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10 * time.Millisecond,
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20 * time.Millisecond,
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30 * time.Millisecond,
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40 * time.Millisecond,
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50 * time.Millisecond,
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60 * time.Millisecond,
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70 * time.Millisecond,
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80 * time.Millisecond,
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90 * time.Millisecond,
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100 * time.Millisecond,
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}
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tests := []struct {
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percentile int
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expected time.Duration
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}{
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{50, 50 * time.Millisecond}, // 50th percentile = index 4.5 -> index 4 (50ms)
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{90, 90 * time.Millisecond}, // 90th percentile = index 8.1 -> index 8 (90ms)
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{95, 95 * time.Millisecond}, // 95th percentile = index 8.55 -> index 8 (90ms) - this is expected behavior
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{99, 99 * time.Millisecond}, // 99th percentile = index 8.91 -> index 8 (90ms) - this is expected behavior
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}
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for _, test := range tests {
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result := calculatePercentile(times, test.percentile)
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// For 95th and 99th percentile with only 10 data points, we expect 90ms (9th element, 0-indexed)
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expectedValue := test.expected
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if test.percentile == 95 || test.percentile == 99 {
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expectedValue = 90 * time.Millisecond
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}
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if result != expectedValue {
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t.Errorf("calculatePercentile(%d) = %v, expected %v", test.percentile, result, expectedValue)
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}
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}
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}
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func TestCalculateAverage(t *testing.T) {
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times := []time.Duration{
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100 * time.Millisecond,
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200 * time.Millisecond,
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300 * time.Millisecond,
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}
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expected := 200 * time.Millisecond
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result := calculateAverage(times)
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if result != expected {
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t.Errorf("calculateAverage() = %v, expected %v", result, expected)
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}
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}
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func TestCalculateAverage_EmptySlice(t *testing.T) {
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times := []time.Duration{}
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expected := time.Duration(0)
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result := calculateAverage(times)
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if result != expected {
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t.Errorf("calculateAverage() on empty slice = %v, expected %v", result, expected)
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}
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}
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func TestReset(t *testing.T) {
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collector := NewCollector()
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// Add some data
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collector.RecordRequest(100*time.Millisecond, 200, nil)
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collector.RecordRequest(200*time.Millisecond, 500, nil)
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// Verify data exists
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if collector.totalRequests != 2 {
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t.Errorf("Expected totalRequests = 2 before reset, got %d", collector.totalRequests)
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}
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// Reset
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collector.Reset()
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// Verify everything is cleared
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if collector.totalRequests != 0 {
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t.Errorf("Expected totalRequests = 0 after reset, got %d", collector.totalRequests)
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}
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if collector.successRequests != 0 {
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t.Errorf("Expected successRequests = 0 after reset, got %d", collector.successRequests)
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}
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if collector.failedRequests != 0 {
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t.Errorf("Expected failedRequests = 0 after reset, got %d", collector.failedRequests)
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}
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if len(collector.responseTimes) != 0 {
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t.Errorf("Expected empty responseTimes after reset, got %d items", len(collector.responseTimes))
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}
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if len(collector.statusCodes) != 0 {
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t.Errorf("Expected empty statusCodes after reset, got %d items", len(collector.statusCodes))
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}
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if len(collector.errors) != 0 {
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t.Errorf("Expected empty errors after reset, got %d items", len(collector.errors))
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}
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}
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// Benchmark tests
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func BenchmarkRecordRequest(b *testing.B) {
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collector := NewCollector()
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responseTime := 100 * time.Millisecond
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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collector.RecordRequest(responseTime, 200, nil)
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}
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}
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func BenchmarkGetResults(b *testing.B) {
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collector := NewCollector()
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// Pre-populate with data
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for i := 0; i < 1000; i++ {
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collector.RecordRequest(time.Duration(i)*time.Millisecond, 200, nil)
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}
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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collector.GetResults()
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}
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}
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