Fix json rendering of large osm ids

CHANGELOG.md

@@ -86,6 +86,7 @@
       - FIXED: Segfault in `UnresolvedManeuverOverride::Turns()` on Australia extracts [#7112](https://github.com/Project-OSRM/osrm-backend/pull/7112)
       - CHANGED: Replaced PL:trunk with PL:expressway to match the latest changes in Polish tagging [#7079](https://github.com/Project-OSRM/osrm-backend/pull/7079)
       - FIXED: Remove unused C++ headers [#7105](https://github.com/Project-OSRM/osrm-backend/pull/7105)
+      - FIXED: Fix json rendering problem for large osm ids [#7096](https://github.com/Project-OSRM/osrm-backend/pull/7096)
     - Profiles:
       - FIXED: Bicycle and foot profiles now don't route on proposed ways [#6615](https://github.com/Project-OSRM/osrm-backend/pull/6615)
       - ADDED: Add optional support of cargo bike exclusion and width to bicyle profile [#7044](https://github.com/Project-OSRM/osrm-backend/pull/7044)

include/util/json_renderer.hpp

@@ -53,7 +53,7 @@ template <typename Out> struct Renderer
         // `fmt::memory_buffer` stores first 500 bytes in the object itself(i.e. on stack in this
         // case) and then grows using heap if needed
         fmt::memory_buffer buffer;
-        fmt::format_to(std::back_inserter(buffer), FMT_COMPILE("{:.10g}"), number.value);
+        fmt::format_to(std::back_inserter(buffer), FMT_COMPILE("{:.12g}"), number.value);
 
         write(buffer.data(), buffer.size());
     }

unit_tests/util/json_render.cpp

@@ -12,9 +12,9 @@ BOOST_AUTO_TEST_CASE(number_truncating)
     std::string str;
     Renderer<std::string> renderer(str);
 
-    // this number would have more than 10 decimals if not truncated
+    // this number would have more than 12 decimals if not truncated
     renderer(Number{42.9995999594999399299});
-    BOOST_CHECK_EQUAL(str, "42.99959996");
+    BOOST_CHECK_EQUAL(str, "42.9995999595");
 }
 
 BOOST_AUTO_TEST_CASE(integer)
@@ -30,7 +30,7 @@ BOOST_AUTO_TEST_CASE(test_json_issue_6531)
     std::string output;
     osrm::util::json::Renderer<std::string> renderer(output);
     renderer(0.0000000000017114087924596788);
-    BOOST_CHECK_EQUAL(output, "1.711408792e-12");
+    BOOST_CHECK_EQUAL(output, "1.71140879246e-12");
 
     output.clear();
     renderer(42.0);
@@ -70,23 +70,28 @@ BOOST_AUTO_TEST_CASE(test_json_issue_6531)
 
     output.clear();
     renderer(42.123456789);
-    BOOST_CHECK_EQUAL(output, "42.12345679");
+    BOOST_CHECK_EQUAL(output, "42.123456789");
 
     output.clear();
     renderer(0.12345678912345);
-    BOOST_CHECK_EQUAL(output, "0.1234567891");
+    BOOST_CHECK_EQUAL(output, "0.123456789123");
 
     output.clear();
     renderer(0.123456789);
     BOOST_CHECK_EQUAL(output, "0.123456789");
 
     output.clear();
     renderer(0.12345678916);
-    BOOST_CHECK_EQUAL(output, "0.1234567892");
+    BOOST_CHECK_EQUAL(output, "0.12345678916");
 
     output.clear();
-    renderer(123456789123456789.);
-    BOOST_CHECK_EQUAL(output, "1.234567891e+17");
+    renderer(12345678912345678.0);
+    BOOST_CHECK_EQUAL(output, "1.23456789123e+16");
+
+    // handle large osm ids, till 12 digits
+    output.clear();
+    renderer(100396615812);
+    BOOST_CHECK_EQUAL(output, "100396615812");
 }
 
 BOOST_AUTO_TEST_SUITE_END()