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controller.go
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controller.go
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package opentelemetry
import (
"context"
"fmt"
"github.com/keyval-dev/opentelemetry-go-instrumentation/pkg/instrumentors/events"
"github.com/keyval-dev/opentelemetry-go-instrumentation/pkg/log"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
"go.opentelemetry.io/otel/trace"
"golang.org/x/sys/unix"
"google.golang.org/grpc"
"os"
"time"
)
const (
otelEndpointEnvVar = "OTEL_EXPORTER_OTLP_ENDPOINT"
otelServiceNameEnvVar = "OTEL_SERVICE_NAME"
)
type Controller struct {
tracerProvider trace.TracerProvider
tracersMap map[string]trace.Tracer
contextsMap map[int64]context.Context // TODO: Use LRU cache
bootTime int64
}
func (c *Controller) getTracer(libName string) trace.Tracer {
t, exists := c.tracersMap[libName]
if exists {
return t
}
newTracer := c.tracerProvider.Tracer(libName)
c.tracersMap[libName] = newTracer
return newTracer
}
func (c *Controller) Trace(event *events.Event) {
log.Logger.V(0).Info("got event", "attrs", event.Attributes, "goroutine", event.GoroutineUID)
ctx := c.getContext(event.GoroutineUID)
attrs := append(event.Attributes, attribute.Key("goroutine.id").Int64(event.GoroutineUID))
newCtx, span := c.getTracer(event.Library).
Start(ctx, event.Name,
trace.WithAttributes(attrs...),
trace.WithSpanKind(event.Kind),
trace.WithTimestamp(c.convertTime(event.StartTime)))
c.updateContext(event.GoroutineUID, newCtx)
span.End(trace.WithTimestamp(c.convertTime(event.EndTime)))
}
func (c *Controller) convertTime(t int64) time.Time {
return time.Unix(0, c.bootTime+t)
}
func (c *Controller) getContext(goroutine int64) context.Context {
ctx, exists := c.contextsMap[goroutine]
if exists {
return ctx
}
newCtx := context.Background()
c.contextsMap[goroutine] = newCtx
return newCtx
}
func (c *Controller) updateContext(goroutine int64, ctx context.Context) {
c.contextsMap[goroutine] = ctx
}
func NewController() (*Controller, error) {
endpoint, exists := os.LookupEnv(otelEndpointEnvVar)
if !exists {
return nil, fmt.Errorf("%s env var must be set", otelEndpointEnvVar)
}
serviceName, exists := os.LookupEnv(otelServiceNameEnvVar)
if !exists {
return nil, fmt.Errorf("%s env var must be set", otelServiceNameEnvVar)
}
ctx := context.Background()
res, err := resource.New(ctx,
resource.WithAttributes(
semconv.ServiceNameKey.String(serviceName),
semconv.TelemetrySDKLanguageGo,
),
)
if err != nil {
return nil, err
}
log.Logger.V(0).Info("Establishing connection to OpenTelemetry collector ...")
timeoutContext, _ := context.WithTimeout(ctx, time.Second*10)
conn, err := grpc.DialContext(timeoutContext, endpoint, grpc.WithInsecure(), grpc.WithBlock())
if err != nil {
log.Logger.Error(err, "unable to connect to OpenTelemetry collector", "addr", endpoint)
return nil, err
}
traceExporter, err := otlptracegrpc.New(ctx,
otlptracegrpc.WithGRPCConn(conn),
)
if err != nil {
return nil, err
}
bsp := sdktrace.NewBatchSpanProcessor(traceExporter)
tracerProvider := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithResource(res),
sdktrace.WithSpanProcessor(bsp),
)
nsec, err := getMonotonicTime()
if err != nil {
return nil, err
}
now := time.Now()
bootTime := now.UnixNano() - nsec
return &Controller{
tracerProvider: tracerProvider,
tracersMap: make(map[string]trace.Tracer),
contextsMap: make(map[int64]context.Context),
bootTime: bootTime,
}, nil
}
func getMonotonicTime() (int64, error) {
var ts unix.Timespec
err := unix.ClockGettime(unix.CLOCK_MONOTONIC, &ts)
if err != nil {
return 0, fmt.Errorf("could not get monotonic time: %s", err)
}
return unix.TimespecToNsec(ts), nil
}