Do not strip leading zeros from trace IDs and span IDs

src/jaegertracing/SpanContext.h

@@ -156,8 +156,9 @@ class SpanContext : public opentracing::SpanContext {
     void print(Stream& out) const
     {
         _traceID.print(out);
-        out << ':' << std::hex << _spanID << ':' << std::hex << _parentID << ':'
-            << std::hex << static_cast<size_t>(_flags);
+        out << ':' << std::setw(16) << std::setfill('0') << std::hex << _spanID
+            << ':' << std::setw(16) << std::setfill('0') << std::hex << _parentID
+            << ':' << std::hex << static_cast<size_t>(_flags);
     }
 
     void ForeachBaggageItem(

src/jaegertracing/SpanContextTest.cpp

@@ -78,7 +78,7 @@ TEST(SpanContext, testFormatting)
     SpanContext spanContext(TraceID(255, 255), 0, 0, 0, SpanContext::StrMap());
     std::ostringstream oss;
     oss << spanContext;
-    ASSERT_EQ("ff00000000000000ff:0:0:0", oss.str());
+    ASSERT_EQ("00000000000000ff00000000000000ff:0000000000000000:0000000000000000:0", oss.str());
 }
 
 TEST(SpanContext, testBaggage)

src/jaegertracing/TraceID.h

@@ -44,11 +44,11 @@ class TraceID {
     void print(Stream& out) const
     {
         if (_high == 0) {
-            out << std::hex << _low;
+            out << std::setw(16) << std::setfill('0') << std::hex << _low;
         }
         else {
-            out << std::hex << _high << std::setw(16) << std::setfill('0')
-                << std::hex << _low;
+            out << std::setw(16) << std::setfill('0') << std::hex << _high
+                << std::setw(16) << std::setfill('0') << std::hex << _low;
         }
     }
 

src/jaegertracing/TraceIDTest.cpp

@@ -20,11 +20,18 @@
 
 namespace jaegertracing {
 
-TEST(TraceID, testPrint)
+TEST(TraceID, testPrintWithouthHigh)
 {
     std::ostringstream oss;
     oss << TraceID(0, 10);
-    ASSERT_EQ("a", oss.str());
+    ASSERT_EQ("000000000000000a", oss.str());
+}
+
+TEST(TraceID, testPrintWithHigh)
+{
+    std::ostringstream oss;
+    oss << TraceID(1, 10);
+    ASSERT_EQ("0000000000000001000000000000000a", oss.str());
 }
 
 }  // namespace jaegertracing