feat: automatically detect imported version (#30)

README.md

@@ -12,12 +12,6 @@ instrumentation for the [jackc/pgx](https://github.com/jackc/pgx) library.
 
 ## Usage
 
-Make sure you have a suitable pgx version:
-
-```bash
-go get github.com/jackc/pgx/v5
-```
-
 Install the library:
 
 ```go

tracer.go

@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"errors"
 	"fmt"
+	"runtime/debug"
 	"strings"
 
 	"github.com/jackc/pgx/v5"
@@ -14,8 +15,12 @@ import (
 	"go.opentelemetry.io/otel/codes"
 	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
 	"go.opentelemetry.io/otel/trace"
+)
+
+const (
+	tracerName = "github.com/exaring/otelpgx"
 
-	"github.com/exaring/otelpgx/internal"
+	sqlOperationUnknown = "UNKNOWN"
 )
 
 const (
@@ -70,7 +75,7 @@ func NewTracer(opts ...Option) *Tracer {
 	}
 
 	return &Tracer{
-		tracer:            cfg.tp.Tracer(internal.TracerName, trace.WithInstrumentationVersion(internal.InstrumentationVersion)),
+		tracer:            cfg.tp.Tracer(tracerName, trace.WithInstrumentationVersion(findOwnImportedVersion())),
 		attrs:             cfg.attrs,
 		trimQuerySpanName: cfg.trimQuerySpanName,
 		spanNameFunc:      cfg.spanNameFunc,
@@ -91,8 +96,6 @@ func recordError(span trace.Span, err error) {
 	}
 }
 
-const sqlOperationUnknown = "UNKNOWN"
-
 // sqlOperationName attempts to get the first 'word' from a given SQL query, which usually
 // is the operation name (e.g. 'SELECT').
 func (t *Tracer) sqlOperationName(stmt string) string {
@@ -354,3 +357,16 @@ func makeParamsAttribute(args []any) attribute.KeyValue {
 	}
 	return QueryParametersKey.StringSlice(ss)
 }
+
+func findOwnImportedVersion() string {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if ok {
+		for _, dep := range buildInfo.Deps {
+			if dep.Path == tracerName {
+				return dep.Version
+			}
+		}
+	}
+
+	return "unknown"
+}

tracer_test.go

@@ -97,10 +97,8 @@ var defaultSpanNameFunc SpanNameFunc = func(query string) string {
 		switch {
 		case strings.HasPrefix(line, "--"):
 			prefix = "--"
-
 		case strings.HasPrefix(line, "/*"):
 			prefix = "/*"
-
 		case strings.HasPrefix(line, "#"):
 			prefix = "#"
 		default: