Fix file not found

2 files changed, 17 insertions, 7 deletions

diff --git a/config.py.dist b/config.py.dist
index 0e27155..f958a6c 100644
--- a/config.py.dist
+++ b/config.py.dist
@@ -3,6 +3,10 @@ BAUDRATE = 9600
 LINES_TO_KEEP = 200
 LAST_LINE_TO_KEEP = 1000
 
+# cache contains [ { 'ts': 'TIMESTMAP', 'line': 'LINE' } ]
+CACHE_FILE = "/tmp/glutte_serial_web.json"
+CACHE_MAX_AGE = 3600 * 24 * 7
+
 TELEGRAM_API_TOKEN = ''
 TELEGRAM_GROUP = ''
 TELEGRAM_REBOOT_COMMAND = './reboot.sh'
diff --git a/serialrx.py b/serialrx.py
index a10db0a..6d4d7a5 100644
--- a/serialrx.py
+++ b/serialrx.py
@@ -141,13 +141,19 @@ class SerialRX(threading.Thread):
                     self._parser.parse_message(line)
                     now = time.time()
 
-                    if config.CACHE_FILE:
-                        with open(config.CACHE_FILE) as fd:
-                            hist = json.load(fd)
-                        hist = [h for h in hist if h['ts'] + config.CACHE_MAX_AGE > now]
-                        host.append({'ts': now, 'line': line})
-                        with open(config.CACHE_FILE, 'w') as fd:
-                            json.dump(hist, fd)
+                    try:
+                        if config.CACHE_FILE:
+                            try:
+                                with open(config.CACHE_FILE) as fd:
+                                    hist = json.load(fd)
+                            except FileNotFoundError:
+                                hist = []
+                            hist = [h for h in hist if h['ts'] + config.CACHE_MAX_AGE > now]
+                            hist.append({'ts': now, 'line': line})
+                            with open(config.CACHE_FILE, 'w') as fd:
+                                json.dump(hist, fd)
+                    except Exception as e:
+                        print(e)
 
                     self.data_lock.acquire()
                     try: