From 1a57c186aa704ba062604b5f96e16df1fcba3c9f Mon Sep 17 00:00:00 2001
From: meriadec <meriadec.pillet@gmail.com>
Date: Fri, 3 Aug 2018 15:21:16 +0200
Subject: [PATCH] Improve robustness of first migration

---
 src/migrations/migrations.js                  |  18 ++++++---
 src/migrations/migrations.spec.js             |  35 ++++++++++++++++++
 .../userdata_v1.0.5_mock-03-missing-file.zip  | Bin 0 -> 4039 bytes
 ...erdata_v1.0.5_mock-04-app-json-present.zip | Bin 0 -> 6066 bytes
 4 files changed, 48 insertions(+), 5 deletions(-)
 create mode 100644 src/migrations/mocks/userdata_v1.0.5_mock-03-missing-file.zip
 create mode 100644 src/migrations/mocks/userdata_v1.0.5_mock-04-app-json-present.zip

diff --git a/src/migrations/migrations.js b/src/migrations/migrations.js
index ed7fc04d..185798ea 100644
--- a/src/migrations/migrations.js
+++ b/src/migrations/migrations.js
@@ -18,7 +18,7 @@ const migrations: Migration[] = [
       const dbPath = db.getDBPath()
       const legacyKeys = ['accounts', 'countervalues', 'settings', 'user']
       const [accounts, countervalues, settings, user] = await Promise.all(
-        legacyKeys.map(key => getLegacyData(path.join(dbPath, `${key}.json`))),
+        legacyKeys.map(key => getFileData(dbPath, key)),
       )
       const appData = { user, settings, accounts, countervalues }
       await db.setNamespace('app', appData)
@@ -28,15 +28,22 @@ const migrations: Migration[] = [
       const windowParams = await db.getKey('app', 'settings.window')
       await db.setKey('app', 'settings.window', undefined)
       await db.setNamespace('windowParams', windowParams)
-      await Promise.all(legacyKeys.map(key => fsUnlink(path.join(dbPath, `${key}.json`))))
+      await Promise.all(
+        legacyKeys.map(async key => {
+          try {
+            await fsUnlink(path.join(dbPath, `${key}.json`))
+          } catch (err) {} // eslint-disable-line
+        }),
+      )
     },
   },
 ]
 
-async function getLegacyData(filePath) {
+async function getFileData(dbPath, fileName) {
+  const filePath = path.join(dbPath, `${fileName}.json`)
   let finalData
-  const fileContent = await fsReadfile(filePath, 'utf-8')
   try {
+    const fileContent = await fsReadfile(filePath, 'utf-8')
     const { data } = JSON.parse(fileContent)
     finalData = data
   } catch (err) {
@@ -45,7 +52,8 @@ async function getLegacyData(filePath) {
       const buf = await fsReadfile(filePath)
       return buf.toString('base64')
     }
-    throw err
+    // will be stripped down by JSON.stringify
+    return undefined
   }
   return finalData
 }
diff --git a/src/migrations/migrations.spec.js b/src/migrations/migrations.spec.js
index 5898cab8..0791326c 100644
--- a/src/migrations/migrations.spec.js
+++ b/src/migrations/migrations.spec.js
@@ -50,6 +50,41 @@ describe('migration 1', () => {
         },
       })
     })
+
+    test('handle missing file without crash', async () => {
+      const dir = await extractMock('userdata_v1.0.5_mock-03-missing-file')
+      let files
+      files = await fsReaddir(dir)
+      expect(files).toEqual(['countervalues.json', 'migrations.json', 'settings.json', 'user.json'])
+      db.init(dir)
+      let err
+      try {
+        await runMigrations()
+      } catch (e) {
+        err = e
+      }
+      expect(err).toBeUndefined()
+      files = await fsReaddir(dir)
+      expect(files).toEqual(['app.json', 'migrations.json', 'windowParams.json'])
+    })
+
+    test('handle where app.json is already present', async () => {
+      const dir = await extractMock('userdata_v1.0.5_mock-04-app-json-present')
+      let files
+      files = await fsReaddir(dir)
+      expect(files).toEqual([
+        'accounts.json',
+        'app.json',
+        'countervalues.json',
+        'migrations.json',
+        'settings.json',
+        'user.json',
+      ])
+      db.init(dir)
+      await runMigrations()
+      files = await fsReaddir(dir)
+      expect(files).toEqual(['app.json', 'migrations.json', 'windowParams.json'])
+    })
   })
 
   describe('with encryption', () => {
diff --git a/src/migrations/mocks/userdata_v1.0.5_mock-03-missing-file.zip b/src/migrations/mocks/userdata_v1.0.5_mock-03-missing-file.zip
new file mode 100644
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diff --git a/src/migrations/mocks/userdata_v1.0.5_mock-04-app-json-present.zip b/src/migrations/mocks/userdata_v1.0.5_mock-04-app-json-present.zip
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