Verify that JSON_delta does not have any strangeness.

diff --git a/server/serve-analysis.js b/server/serve-analysis.js
index 86f2d9083aa9c229451a42acfa9edfba62daa97b..41610e1439d733d2f73c0389351f711454a5e9a0 100644 (file)
--- a/server/serve-analysis.js
+++ b/server/serve-analysis.js
@@ -134,6 +134,17 @@ var create_json_historic_diff = function(new_json, history_left, new_diff_json,
        var histobj = history_left.shift();
        var diff = delta.JSON_delta.diff(histobj.parsed, new_json.parsed);
        var diff_text = JSON.stringify(diff);
+
+       // Verify that the delta is correct
+       var base = JSON.parse(histobj.plain);
+       delta.JSON_delta.patch(base, diff);
+       var correct_pv = JSON.stringify(base['pv']);
+       var wrong_pv = JSON.stringify(new_json.parsed['pv']);
+       if (correct_pv !== wrong_pv) {
+               console.log("Patch went wrong:", histobj.plain, new_json.plain);
+               exit();
+       }
+
        zlib.gzip(diff_text, function(err, buffer) {
                if (err) throw err;
                new_diff_json[histobj.last_modified] = {