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Unify shutting down into an executioner utility
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,8 @@ | ||
| FROM golang:1.23 | ||
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| WORKDIR /usr/src/go.opentelemetry.io/auto/internal/tools/executioner | ||
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| COPY . /usr/src/go.opentelemetry.io/auto/ | ||
| RUN CGO_ENABLED=0 go build -a -installsuffix cgo -o /usr/local/bin/executioner ./... | ||
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| ENTRYPOINT ["/usr/local/bin/executioner"] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| // Copyright The OpenTelemetry Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| package main | ||
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| import ( | ||
| "context" | ||
| "flag" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "os" | ||
| "os/signal" | ||
| "strings" | ||
| "syscall" | ||
| "time" | ||
| ) | ||
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| const ( | ||
| telemetryPath = "/metrics" | ||
| shutdownPath = "/shutdown" | ||
| metricName = "otelcol_exporter_sent_spans" | ||
| exporterAttr = `exporter="file/trace"` | ||
| ) | ||
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| func main() { | ||
| // Command-line flags | ||
| collectorAddress := flag.String("collector-address", "http://collector", "Address of the collector") | ||
| spanCount := flag.Int("span-count", 0, "Number of spans to check before shutting down the collector") | ||
| checkLimit := flag.Int("limit", 5, "Maximum number of times to check the span count") | ||
| interval := flag.Duration("interval", 2*time.Second, "Duration between span count checks") | ||
| flag.Parse() | ||
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| if *spanCount < 0 { | ||
| fmt.Println("Error: span-count must not be negative") | ||
| return | ||
| } | ||
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| // TODO: have these ports be configurable. | ||
| telemetryURL := fmt.Sprintf("%s:8888%s", *collectorAddress, telemetryPath) | ||
| shutdownURL := fmt.Sprintf("%s:8080%s", *collectorAddress, shutdownPath) | ||
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| // Context to handle SIGTERM. | ||
| ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) | ||
| defer stop() | ||
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| if *spanCount == 0 { | ||
| fmt.Println("Span count is 0. Skipping span count check.") | ||
| if err := sendShutdownSignal(ctx, shutdownURL); err != nil { | ||
| fmt.Println(err) | ||
| } | ||
| return | ||
| } | ||
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| fmt.Printf("Checking collector at %s for %d spans\n", telemetryURL, *spanCount) | ||
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| for i := 0; i < *checkLimit; i++ { | ||
| select { | ||
| case <-ctx.Done(): | ||
| fmt.Println("Received termination signal. Exiting.") | ||
| if err := sendShutdownSignal(ctx, shutdownURL); err != nil { | ||
| fmt.Println(err) | ||
| } | ||
| return | ||
| default: | ||
| } | ||
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| spanCountReached, err := checkSpanCount(ctx, telemetryURL, *spanCount) | ||
| if err != nil { | ||
| fmt.Printf("Error checking span count: %v\n", err) | ||
| time.Sleep(*interval) | ||
| continue | ||
| } | ||
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| if spanCountReached { | ||
| fmt.Printf("Span count of %d reached.\n", *spanCount) | ||
| if err := sendShutdownSignal(ctx, shutdownURL); err != nil { | ||
| fmt.Println(err) | ||
| } | ||
| return | ||
| } | ||
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| time.Sleep(*interval) // Wait before checking again | ||
| } | ||
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| fmt.Println("Reached check limit without meeting span count requirement.") | ||
| if err := sendShutdownSignal(ctx, shutdownURL); err != nil { | ||
| fmt.Println(err) | ||
| } | ||
| } | ||
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| func checkSpanCount(ctx context.Context, url string, targetCount int) (bool, error) { | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to create request: %v", err) | ||
| } | ||
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| resp, err := http.DefaultClient.Do(req) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to fetch telemetry data: %v", err) | ||
| } | ||
| defer resp.Body.Close() | ||
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| if resp.StatusCode != http.StatusOK { | ||
| return false, fmt.Errorf("unexpected status code: %d", resp.StatusCode) | ||
| } | ||
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| body, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to read telemetry response body: %v", err) | ||
| } | ||
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| lines := strings.Split(string(body), "\n") | ||
| for _, line := range lines { | ||
| if strings.HasPrefix(line, metricName) && strings.Contains(line, exporterAttr) { | ||
| fields := strings.Fields(line) | ||
| if len(fields) < 2 { | ||
| continue | ||
| } | ||
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| var value int | ||
| _, err := fmt.Sscanf(fields[len(fields)-1], "%d", &value) | ||
| if err != nil { | ||
| return false, fmt.Errorf("failed to parse span count: %v", err) | ||
| } | ||
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| return value >= targetCount, nil | ||
| } | ||
| } | ||
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| return false, nil | ||
| } | ||
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| func sendShutdownSignal(ctx context.Context, url string) error { | ||
| fmt.Printf("Sending shutdown signal to %s\n", url) | ||
| req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to create shutdown request: %v", err) | ||
| } | ||
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| resp, err := http.DefaultClient.Do(req) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to send shutdown request: %v", err) | ||
| } | ||
| defer resp.Body.Close() | ||
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| if resp.StatusCode != http.StatusOK { | ||
| return fmt.Errorf("unexpected status code: %d", resp.StatusCode) | ||
| } | ||
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| fmt.Println("Shutdown signal sent successfully.") | ||
| return nil | ||
| } |