feat(ci): afficher tendances et médianes des workflows

src/backend/src/gitea.js

@@ -114,6 +114,53 @@ async function getWorkflowRunForCommit(owner, repo, commitHash) {
   return runs.find((run) => run.commit && run.commit.startsWith(commitHash)) || null;
 }
 
+/** Retourne la médiane d'une série numérique non vide. */
+function median(values) {
+  if (!values.length) return null;
+  const sorted = [...values].sort((left, right) => left - right);
+  const middle = Math.floor(sorted.length / 2);
+  return sorted.length % 2 ? sorted[middle] : Math.round((sorted[middle - 1] + sorted[middle]) / 2);
+}
+
+/**
+ * Construit une synthèse déterministe sur les derniers runs CI.
+ * Les comparaisons ne sont calculées qu’avec deux fenêtres d’au moins deux runs
+ * pour ne pas transformer une variation isolée en tendance.
+ */
+function calculateCiSummary(runs) {
+  const completed = runs.filter((run) => run.status === 'completed');
+  const successful = completed.filter((run) => run.conclusion === 'success');
+  const durations = completed.map((run) => run.durationSeconds).filter(Number.isFinite);
+  const windowSize = Math.floor(durations.length / 2);
+  const recent = windowSize >= 2 ? durations.slice(0, windowSize) : [];
+  const previous = windowSize >= 2 ? durations.slice(windowSize, windowSize * 2) : [];
+  const recentMedian = median(recent);
+  const previousMedian = median(previous);
+  const changePercent = previousMedian && recentMedian !== null
+    ? Math.round(((recentMedian - previousMedian) / previousMedian) * 100)
+    : null;
+  const trend = changePercent === null ? 'unknown'
+    : changePercent <= -10 ? 'faster'
+      : changePercent >= 10 ? 'slower'
+        : 'stable';
+
+  return {
+    sampleSize: completed.length,
+    successful: successful.length,
+    failed: completed.length - successful.length,
+    successRate: completed.length ? Math.round((successful.length / completed.length) * 100) : null,
+    medianDurationSeconds: median(durations),
+    recentMedianDurationSeconds: recentMedian,
+    previousMedianDurationSeconds: previousMedian,
+    trend,
+    changePercent,
+  };
+}
+
+async function getWorkflowRunSummary(owner, repo) {
+  return calculateCiSummary(await getWorkflowRuns(owner, repo, 30));
+}
+
 /**
  * Récupérer tous les dépôts (avec retry en cas d'erreur DNS)
  */
@@ -158,8 +205,10 @@ module.exports = {
   getCommits,
   getBranches,
   getWorkflowRuns,
+  getWorkflowRunSummary,
   getWorkflowRunForCommit,
   normalizeWorkflowRun,
+  calculateCiSummary,
   listRepos,
   createRepo,
   giteaClient,

src/backend/src/routes.js

@@ -4,7 +4,7 @@ const path = require('path');
 const fs = require('fs');
 const { authenticate, authMiddleware } = require('./auth');
 const { docker, getContainerInfo, getContainerLogs, listContainers, redeployApp, gitPull, startContainer, stopContainer, restartContainer, getServerMetrics } = require('./docker');
-const { getRepo, getCommits, getBranches, getWorkflowRuns, listRepos } = require('./gitea');
+const { getRepo, getCommits, getBranches, getWorkflowRuns, getWorkflowRunSummary, listRepos } = require('./gitea');
 const { checkAllApps, addDeploymentLog, updateDeploymentLog, getDeploymentLogs, getAllStatuses, getAppStatus, cleanupOrphanedDeployments } = require('./healthcheck');
 const { createApplication, getAvailableStacks, initDynamicApps } = require('./app-creator');
 const config = require('./config');
@@ -409,6 +409,15 @@ router.get('/gitea/repos/:owner/:repo/actions/runs', authMiddleware, async (req,
   }
 });
 
+// Synthèse historique : taux de succès, médiane et tendance des validations CI.
+router.get('/gitea/repos/:owner/:repo/actions/summary', authMiddleware, async (req, res) => {
+  try {
+    res.json(await getWorkflowRunSummary(req.params.owner, req.params.repo));
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
 // ============ PUBLIC STATUS ROUTE (sans authentification) ============
 // Utilisé par le portail applicatif pour griser les tuiles des apps arrêtées
 router.get('/public/status', async (req, res) => {

src/backend/test/gitea.test.js

@@ -1,5 +1,5 @@
 const assert = require('node:assert/strict');
-const { normalizeWorkflowRun } = require('../src/gitea');
+const { normalizeWorkflowRun, calculateCiSummary } = require('../src/gitea');
 
 const run = normalizeWorkflowRun({
   id: 42,
@@ -14,4 +14,14 @@ const run = normalizeWorkflowRun({
 assert.equal(run.commit, 'abcdef123456');
 assert.equal(run.durationSeconds, 125);
 assert.equal(run.conclusion, 'success');
+
+const summary = calculateCiSummary([
+  { status: 'completed', conclusion: 'success', durationSeconds: 90 },
+  { status: 'completed', conclusion: 'success', durationSeconds: 110 },
+  { status: 'completed', conclusion: 'failure', durationSeconds: 120 },
+  { status: 'completed', conclusion: 'success', durationSeconds: 100 },
+]);
+assert.equal(summary.successRate, 75);
+assert.equal(summary.medianDurationSeconds, 105);
+assert.equal(summary.trend, 'stable');
 console.log('OK gitea');