Improve performance of JSON rendering

.github/workflows/osrm-backend.yml

@@ -715,6 +715,7 @@ jobs:
         pushd ${OSRM_BUILD_DIR}
         make --jobs=${JOBS} benchmarks
         ./src/benchmarks/alias-bench 
+        ./src/benchmarks/json-render-bench
         ./src/benchmarks/match-bench ../test/data/ch/monaco.osrm
         ./src/benchmarks/packedvector-bench
         ./src/benchmarks/rtree-bench ../test/data/monaco.osrm.ramIndex ../test/data/monaco.osrm.fileIndex ../test/data/monaco.osrm.nbg_nodes

CHANGELOG.md

@@ -9,6 +9,7 @@
     - NodeJS:
       - FIXED: Support `skip_waypoints` in Node bindings [#6060](https://github.com/Project-OSRM/osrm-backend/pull/6060)
     - Misc:
+      - CHANGED: Improve performance of JSON rendering. Fix undefined behaviour in JSON numbers formatting. [#6380](https://github.com/Project-OSRM/osrm-backend/pull/6380)
       - ADDED: Add timestamps for logs. [#6375](https://github.com/Project-OSRM/osrm-backend/pull/6375)
       - CHANGED: Improve performance of map matching via getPathDistance optimization. [#6378](https://github.com/Project-OSRM/osrm-backend/pull/6378)
       - CHANGED: Optimize RestrictionParser performance. [#6344](https://github.com/Project-OSRM/osrm-backend/pull/6344)

features/testbot/annotations.feature

@@ -115,4 +115,4 @@ Feature: Annotations
 
         When I route I should get
             | from | to | route    | a:speed | a:distance            | a:duration | a:nodes |
-            | a    | c  | abc,abc  | 10:10   | 249.987619:299.962882 | 25:30      | 1:2:3   |
+            | a    | c  | abc,abc  | 10:10   | 249.987618946:299.962882039 | 25:30      | 1:2:3   |

features/testbot/matching.feature

@@ -809,7 +809,7 @@ Feature: Basic Map Matching
 
         # These should have the same weights/duration in either direction
         When I match I should get
-          | trace | geometry             | a:distance | a:duration | a:weight | duration |
-          | 2345  | 1.00018,1,1.000314,1 | 14.914666  | 1.4        | 1.4      | 1.4      |
-          | 4321  | 1.00027,1,1.000135,1 | 15.02597   | 1.5        | 1.5      | 1.5      |
+          | trace | geometry             | a:distance    | a:duration | a:weight | duration |
+          | 2345  | 1.00018,1,1.000314,1 | 14.914666491  | 1.4        | 1.4      | 1.4      |
+          | 4321  | 1.00027,1,1.000135,1 | 15.025969972  | 1.5        | 1.5      | 1.5      |
 

features/testbot/snap_intersection.feature

@@ -570,7 +570,7 @@ Feature: Snapping at intersections
             | a,f,k     | ac,cf,cf,fj,kj,kj     | 132.8s | 132.8  |
             | k,f       | ik,fi,fi              | 54.3s  | 54.3   |
             | f,a       | ef,ae,ae              | 66.6s  | 66.6   |
-            | k,f,a     | kj,fj,fj,ef,ae,ae     | 141.4s | 141.4  |
+            | k,f,a     | kj,fj,fj,ef,ae,ae     | 141.399999999s | 141.399999999  |
 
         When I request a travel time matrix I should get
             |   |  a    |   f  |     k |
@@ -626,4 +626,4 @@ Feature: Snapping at intersections
             | a,f,k     | ad,df,df,fj,kj,kj    | 105.6s | 105.6  |
             | k,f       | ik,fi,fi             | 54.3s  | 54.3   |
             | f,a       | ef,ae,ae             | 66.6s  | 66.6   |
-            | k,f,a     | ik,fi,fi,ef,ae,ae    | 120.9s | 120.9  |
+            | k,f,a     | ik,fi,fi,ef,ae,ae    | 120.899999999s | 120.899999999  |

features/testbot/weight.feature

@@ -52,11 +52,11 @@ Feature: Weight tests
             | abc   |
 
         When I route I should get
-            | waypoints | route   | distances | weights | times   | a:distance          | a:duration | a:weight | a:speed |
-            | s,t       | abc,abc | 20m,0m    | 2,0     | 2s,0s   | 20.034627           | 2          | 2        | 10      |
-            | t,s       | abc,abc | 20m,0m    | 2,0     | 2s,0s   | 20.034627           | 2          | 2        | 10      |
-            | s,e       | abc,abc | 40m,0m    | 3.9,0   | 3.9s,0s | 29.940636:10.017313 | 3:0.9      | 3:0.9    | 10:11.1  |
-            | e,s       | abc,abc | 40m,0m    | 3.9,0   | 3.9s,0s | 10.017313:29.940636 | 0.9:3      | 0.9:3    | 11.1:10  |
+            | waypoints | route   | distances | weights | times   | a:distance                | a:duration | a:weight | a:speed |
+            | s,t       | abc,abc | 20m,0m    | 2,0     | 2s,0s   | 20.034626629              | 2          | 2        | 10      |
+            | t,s       | abc,abc | 20m,0m    | 2,0     | 2s,0s   | 20.034626629              | 2          | 2        | 10      |
+            | s,e       | abc,abc | 40m,0m    | 3.9,0   | 3.9s,0s | 29.940636463:10.017313314 | 3:0.9      | 3:0.9    | 10:11.1  |
+            | e,s       | abc,abc | 40m,0m    | 3.9,0   | 3.9s,0s | 10.017313314:29.940636463 | 0.9:3      | 0.9:3    | 11.1:10  |
 
 
     Scenario: Step weights -- way_function: fail if no weight or weight_per_meter property

fuzz/escape_json.cc

@@ -5,13 +5,14 @@
 #include <iterator>
 #include <string>
 
-using osrm::util::escape_JSON;
+using osrm::util::EscapeJSONString;
 
 extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size)
 {
     const std::string in(reinterpret_cast<const char *>(data), size);
 
-    const auto escaped = escape_JSON(in);
+    std::string escaped;
+    EscapeJSONString(in, escaped);
     escape(escaped.data());
 
     return 0;

include/nodejs/json_v8_renderer.hpp

@@ -60,8 +60,8 @@ struct V8Renderer
 
 inline void renderToV8(v8::Local<v8::Value> &out, const osrm::json::Object &object)
 {
-    osrm::json::Value value = object;
-    mapbox::util::apply_visitor(V8Renderer(out), value);
+    V8Renderer renderer(out);
+    renderer(object);
 }
 } // namespace node_osrm