Instana tracer implementation

vendor/github.com/instana/go-sensor/eum.go

@@ -0,0 +1,37 @@
+package instana
+
+import (
+	"bytes"
+	"io/ioutil"
+	"strings"
+)
+
+const eumTemplate string = "eum.js"
+
+// EumSnippet generates javascript code to initialize JavaScript agent
+func EumSnippet(apiKey string, traceID string, meta map[string]string) string {
+
+	if len(apiKey) == 0 || len(traceID) == 0 {
+		return ""
+	}
+
+	b, err := ioutil.ReadFile(eumTemplate)
+
+	if err != nil {
+		return ""
+	}
+
+	var snippet = string(b)
+	var metaBuffer bytes.Buffer
+
+	snippet = strings.Replace(snippet, "$apiKey", apiKey, -1)
+	snippet = strings.Replace(snippet, "$traceId", traceID, -1)
+
+	for key, value := range meta {
+		metaBuffer.WriteString("  ineum('meta', '" + key + "', '" + value + "');\n")
+	}
+
+	snippet = strings.Replace(snippet, "$meta", metaBuffer.String(), -1)
+
+	return snippet
+}