From 19429b86af83129059f15dab00ee4bb8a7b54fc2 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 18 Jul 2023 14:21:40 +0200
Subject: [systemstatus] Improve coloring of disk space indicator, js tweaks

---
 modules-available/systemstatus/page.inc.php | 45 ++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 17 deletions(-)

(limited to 'modules-available/systemstatus/page.inc.php')

diff --git a/modules-available/systemstatus/page.inc.php b/modules-available/systemstatus/page.inc.php
index 96b2c5c9..c97f6172 100644
--- a/modules-available/systemstatus/page.inc.php
+++ b/modules-available/systemstatus/page.inc.php
@@ -173,11 +173,11 @@ class Page_SystemStatus extends Page
 		User::assertPermission("show.overview.diskstat");
 		if (!SystemStatus::diskStat($systemUsage, $storeUsage, $currentSource, $wantedSource))
 			return;
-		$data = ['system' => $this->convertDiskStat($systemUsage)];
+		$data = ['system' => $this->convertDiskStat($systemUsage, 3000)];
 		if ($wantedSource === false) { // Not configured yet, nothing to display
 			$data['notConfigured'] = true;
 		} elseif ($wantedSource === $currentSource) { // Fine and dandy
-			$data['store'] = $this->convertDiskStat($storeUsage);
+			$data['store'] = $this->convertDiskStat($storeUsage, 250000);
 		} elseif ($currentSource === false) { // No current source, nothing mounted
 			$data['storeMissing'] = true;
 		} else { // Something else mounted
@@ -251,13 +251,16 @@ class Page_SystemStatus extends Page
 		}
 		$info = $this->sysInfo();
 		if (isset($info['MemTotal']) && isset($info['MemFree']) && isset($info['SwapTotal'])) {
+			$avail = $info['MemAvailable'] ?? ($info['MemFree'] + $info['Buffers'] + $info['Cached']);
 			$data['memTotal'] = Util::readableFileSize($info['MemTotal'] * 1024);
-			$data['memFree'] = Util::readableFileSize(($info['MemFree'] + $info['Buffers'] + $info['Cached']) * 1024);
-			$data['memPercent'] = 100 - round((($info['MemFree'] + $info['Buffers'] + $info['Cached']) / $info['MemTotal']) * 100);
+			$data['memFree'] = Util::readableFileSize($avail * 1024);
+			$data['memPercent'] = 100 - round(($avail / $info['MemTotal']) * 100);
 			$data['swapTotal'] = Util::readableFileSize($info['SwapTotal'] * 1024);
 			$data['swapUsed'] = Util::readableFileSize(($info['SwapTotal'] - $info['SwapFree']) * 1024);
 			$data['swapPercent'] = 100 - round(($info['SwapFree'] / $info['SwapTotal']) * 100);
-			$data['swapWarning'] = ($data['swapPercent'] > 50 || $info['SwapFree'] < 400000);
+			if ($data['swapTotal'] > 0 && $data['memPercent'] > 75) {
+				$data['swapWarning'] = ($data['swapPercent'] > 80 || $info['SwapFree'] < 400000);
+			}
 		}
 		if (isset($info['CpuIdle']) && isset($info['CpuSystem']) && isset($info['CpuTotal'])) {
 			$data['cpuLoad'] = 100 - round(($info['CpuIdle'] / $info['CpuTotal']) * 100);
@@ -482,31 +485,39 @@ class Page_SystemStatus extends Page
 		echo '<pre>', htmlspecialchars($data, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8'), '</pre>';
 	}
 
-	private function convertDiskStat($stat)
+	private function convertDiskStat(array $stat, int $minFreeMb): array
 	{
-		if (!is_array($stat))
-			return false;
 		return [
 			'percent' => $stat['usedPercent'],
 			'size' => Util::readableFileSize($stat['sizeKb'] * 1024),
 			'free' => Util::readableFileSize($stat['freeKb'] * 1024),
-			'color' => $this->usageColor($stat['usedPercent']),
+			'color' => $this->usageColor($stat, $minFreeMb),
 			'filesystem' => $stat['fileSystem'],
 		];
 	}
 
-	private function usageColor($percent)
+	private function usageColor(array $stat, int $minFreeMb): string
 	{
-		if ($percent <= 50) {
-			$r = $b = $percent / 3;
-			$g = (100 - $percent * (50 / 80));
-		} elseif ($percent <= 70) {
-			$r = 55 + ($percent - 50) * (30 / 20);
+		$freeMb = round($stat['freeKb'] / 1024);
+		// All good is half space free, or 4x the min free amount, whatever is more
+		$okFreeMb = max($minFreeMb * 4, round($stat['sizeKb']) / (1024 * 2));
+		if ($freeMb > $okFreeMb) {
+			$usedPercent = 0;
+		} elseif ($freeMb < $minFreeMb) {
+			$usedPercent = 100;
+		} else {
+			$usedPercent = 100 - round(($freeMb - $minFreeMb) / ($okFreeMb - $minFreeMb) * 100);
+		}
+		if ($usedPercent <= 50) {
+			$r = $b = $usedPercent / 3;
+			$g = (100 - $usedPercent * (50 / 80));
+		} elseif ($usedPercent <= 70) {
+			$r = 55 + ($usedPercent - 50) * (30 / 20);
 			$g = 60;
 			$b = 0;
 		} else {
-			$r = ($percent - 70) / 3 + 90;
-			$g = (100 - $percent) * (60 / 30);
+			$r = ($usedPercent - 70) / 3 + 90;
+			$g = (100 - $usedPercent) * (60 / 30);
 			$b = 0;
 		}
 		$r = dechex(round($r * 2.55));
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