From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Tue, 28 Jan 2020 16:32:54 +0000 (+0100)
Subject: Verify that JSON_delta does not have any strangeness.
X-Git-Url: https://git.sesse.net/?p=remoteglot;a=commitdiff_plain;h=d5e047ca5c28b2a6e4be62b7ee7cb3f11552f028

Verify that JSON_delta does not have any strangeness.
---

diff --git a/server/serve-analysis.js b/server/serve-analysis.js
index 86f2d90..41610e1 100644
--- 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] = {