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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "context" |
| 6 | + "encoding/json" |
| 7 | + "fmt" |
| 8 | + "io" |
| 9 | + "log" |
| 10 | + "net/http" |
| 11 | + "os" |
| 12 | + "time" |
| 13 | + |
| 14 | + "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp" |
| 15 | + "go.opentelemetry.io/otel" |
| 16 | + "go.opentelemetry.io/otel/attribute" |
| 17 | + "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc" |
| 18 | + "go.opentelemetry.io/otel/exporters/otlp/otlptrace" |
| 19 | + "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc" |
| 20 | + "go.opentelemetry.io/otel/metric" |
| 21 | + "go.opentelemetry.io/otel/propagation" |
| 22 | + sdkmetric "go.opentelemetry.io/otel/sdk/metric" |
| 23 | + "go.opentelemetry.io/otel/sdk/resource" |
| 24 | + sdktrace "go.opentelemetry.io/otel/sdk/trace" |
| 25 | + semconv "go.opentelemetry.io/otel/semconv/v1.4.0" |
| 26 | +) |
| 27 | + |
| 28 | +type Bdev struct { |
| 29 | + Name string `json:"name"` |
| 30 | + BytesRead int64 `json:"bytes_read"` |
| 31 | + NumReadOps int64 `json:"num_read_ops"` |
| 32 | + BytesWritten int64 `json:"bytes_written"` |
| 33 | + NumWriteOps int64 `json:"num_write_ops"` |
| 34 | + ReadLatencyTicks int64 `json:"read_latency_ticks"` |
| 35 | + WriteLatencyTicks int64 `json:"write_latency_ticks"` |
| 36 | +} |
| 37 | + |
| 38 | +type SPDKResponse struct { |
| 39 | + Result struct { |
| 40 | + Bdevs []Bdev `json:"bdevs"` |
| 41 | + } `json:"result"` |
| 42 | +} |
| 43 | + |
| 44 | +func initProvider() func() { |
| 45 | + ctx := context.Background() |
| 46 | + |
| 47 | + res, err := resource.New(ctx, |
| 48 | + |
| 49 | + resource.WithAttributes( |
| 50 | + semconv.ServiceNameKey.String("spdk-client"), |
| 51 | + ), |
| 52 | + ) |
| 53 | + handleErr(err, "failed to create resource") |
| 54 | + |
| 55 | + otelAgentAddr := os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT") |
| 56 | + if otelAgentAddr == "" { |
| 57 | + otelAgentAddr = "otel-gw-collector:4317" |
| 58 | + } |
| 59 | + |
| 60 | + // Metric Exporter |
| 61 | + metricExp, err := otlpmetricgrpc.New( |
| 62 | + ctx, |
| 63 | + otlpmetricgrpc.WithInsecure(), |
| 64 | + otlpmetricgrpc.WithEndpoint(otelAgentAddr), |
| 65 | + ) |
| 66 | + handleErr(err, "Failed to create the collector metric exporter") |
| 67 | + |
| 68 | + meterProvider := sdkmetric.NewMeterProvider( |
| 69 | + sdkmetric.WithReader(sdkmetric.NewPeriodicReader(metricExp)), |
| 70 | + sdkmetric.WithResource(res), |
| 71 | + ) |
| 72 | + otel.SetMeterProvider(meterProvider) |
| 73 | + |
| 74 | + // Trace Exporter |
| 75 | + traceClient := otlptracegrpc.NewClient( |
| 76 | + otlptracegrpc.WithInsecure(), |
| 77 | + otlptracegrpc.WithEndpoint(otelAgentAddr)) |
| 78 | + traceExp, err := otlptrace.New(ctx, traceClient) |
| 79 | + handleErr(err, "Failed to create trace exporter") |
| 80 | + |
| 81 | + bsp := sdktrace.NewBatchSpanProcessor(traceExp) |
| 82 | + tracerProvider := sdktrace.NewTracerProvider( |
| 83 | + sdktrace.WithSpanProcessor(bsp), |
| 84 | + sdktrace.WithResource(res), |
| 85 | + ) |
| 86 | + otel.SetTracerProvider(tracerProvider) |
| 87 | + otel.SetTextMapPropagator(propagation.TraceContext{}) |
| 88 | + |
| 89 | + return func() { |
| 90 | + cxt, cancel := context.WithTimeout(ctx, time.Second) |
| 91 | + defer cancel() |
| 92 | + if err := traceExp.Shutdown(cxt); err != nil { |
| 93 | + log.Printf("Failed to shutdown trace exporter: %v", err) |
| 94 | + } |
| 95 | + if err := meterProvider.Shutdown(cxt); err != nil { |
| 96 | + log.Printf("Failed to shutdown metric exporter: %v", err) |
| 97 | + } |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +func handleErr(err error, message string) { |
| 102 | + if err != nil { |
| 103 | + log.Fatalf("%s: %v", message, err) |
| 104 | + } |
| 105 | +} |
| 106 | + |
| 107 | +func fetchSPDKMetrics(ctx context.Context) []Bdev { |
| 108 | + url := "http://spdk:9009" |
| 109 | + reqBody := []byte(`{"id":1, "method": "bdev_get_iostat"}`) |
| 110 | + |
| 111 | + client := http.Client{ |
| 112 | + Transport: otelhttp.NewTransport(http.DefaultTransport), |
| 113 | + } |
| 114 | + |
| 115 | + req, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(reqBody)) |
| 116 | + if err != nil { |
| 117 | + log.Fatalf("Failed to create request: %v", err) |
| 118 | + } |
| 119 | + req.SetBasicAuth("spdkuser", "spdkpass") |
| 120 | + req.Header.Set("Content-Type", "application/json") |
| 121 | + |
| 122 | + resp, err := client.Do(req) |
| 123 | + if err != nil { |
| 124 | + log.Fatalf("Failed to send request: %v", err) |
| 125 | + } |
| 126 | + defer resp.Body.Close() |
| 127 | + |
| 128 | + body, err := io.ReadAll(resp.Body) |
| 129 | + if err != nil { |
| 130 | + log.Fatalf("Failed to read response body: %v", err) |
| 131 | + } |
| 132 | + |
| 133 | + var response SPDKResponse |
| 134 | + err = json.Unmarshal(body, &response) |
| 135 | + if err != nil { |
| 136 | + log.Fatalf("Failed to parse SPDK response: %v", err) |
| 137 | + } |
| 138 | + |
| 139 | + return response.Result.Bdevs |
| 140 | +} |
| 141 | + |
| 142 | +func main() { |
| 143 | + shutdown := initProvider() |
| 144 | + defer shutdown() |
| 145 | + |
| 146 | + tracer := otel.Tracer("spdk-client") |
| 147 | + meter := otel.Meter("spdk-client-meter") |
| 148 | + |
| 149 | + // Metrics |
| 150 | + bytesRead, _ := meter.Int64Counter("spdk/bdev/bytes_read") |
| 151 | + numReadOps, _ := meter.Int64Counter("spdk/bdev/read_ops") |
| 152 | + |
| 153 | + for{ |
| 154 | + ctx, span := tracer.Start(context.Background(), "FetchSPDKMetrics") |
| 155 | + bdevs := fetchSPDKMetrics(ctx) |
| 156 | + |
| 157 | + for _, bdev := range bdevs { |
| 158 | + attributes := []attribute.KeyValue{ |
| 159 | + attribute.String("bdev.name", bdev.Name), |
| 160 | + } |
| 161 | + bytesRead.Add(ctx, bdev.BytesRead, metric.WithAttributes(attributes...)) |
| 162 | + numReadOps.Add(ctx, bdev.NumReadOps, metric.WithAttributes(attributes...)) |
| 163 | + |
| 164 | + fmt.Printf("Bdev: %s, BytesRead: %d, NumReadOps: %d\n", |
| 165 | + bdev.Name, bdev.BytesRead, bdev.NumReadOps) |
| 166 | + } |
| 167 | + span.End() |
| 168 | + time.Sleep(5 * time.Second) |
| 169 | + } |
| 170 | + // Health check endpoint |
| 171 | + http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) { |
| 172 | + w.WriteHeader(http.StatusOK) |
| 173 | + fmt.Fprintln(w, "OK") |
| 174 | + }) |
| 175 | + |
| 176 | + // Application logic |
| 177 | + http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { |
| 178 | + fmt.Fprintln(w, "Hello, World!") |
| 179 | + }) |
| 180 | + |
| 181 | + // Start server |
| 182 | + http.ListenAndServe(":57400", nil) |
| 183 | +} |
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