change adapter response type to dict

this simplifies a lot of code since tuples are immutable.

 - adapters: add Adapter._construct
 - worker: set status state to False on worker crash

elstat/adapters.py

@@ -12,10 +12,15 @@ class Adapter:
     }
 
     @classmethod
-    async def query(cls, _worker, _adp_args) -> tuple:
+    async def query(cls, _worker, _adp_args: dict) -> dict:
         """Main query function."""
         raise NotImplementedError
 
+    @classmethod
+    def _construct(cls, *args) -> dict:
+        columns = cls.spec['db'][1:]
+        return {col: args[idx] for idx, col in enumerate(columns)}
+
 
 class PingAdapter(Adapter):
     """Ping the given address and report if
@@ -52,8 +57,8 @@ class PingAdapter(Adapter):
         else:
             latency = 0
 
-        worker.log.info(f'{worker.name}: alive? {alive} latency? {latency}ms')
-        return (alive, latency)
+        worker.log.info(f'{worker.name}: alive={alive} latency={latency}ms')
+        return cls._construct(alive, latency)
 
 
 class HttpAdapter(Adapter):
@@ -78,7 +83,7 @@ class HttpAdapter(Adapter):
                         f'latency={latency}ms')
 
         if resp.status == 200:
-            return True, latency
+            return cls._construct(True, latency)
 
         # use 0ms drops as failures
-        return False, 0
+        return cls._construct(False, 0)

elstat/blueprints/api.py

@@ -11,13 +11,9 @@ def get_status(manager):
         if state is None:
             continue
 
-        # timestamp will always be the first
-        worker = manager.workers[name]
-        columns = worker.adapter.spec['db'][1:]
-        res[name] = {}
-        for key, val in zip(columns, state):
-            res[name][key] = val
+        res[name] = state
 
+        worker = manager.workers[name]
         res[name]['description'] = worker.service['description']
 
     return res

elstat/worker.py

@@ -19,7 +19,7 @@ class ServiceWorker:
     async def work(self):
         return await self.adapter.query(self, self.service['adapter_args'])
 
-    async def process_work(self, result: tuple):
+    async def process_work(self, result: dict):
         """Process given adapter result and insert into
         the database."""
         columns = self.adapter.spec['db']
@@ -33,7 +33,12 @@ class ServiceWorker:
         VALUES ({args_str})
         """
 
-        conn.execute(query, (timestamp, ) + result)
+        args = []
+        for col in columns[1:]:
+            val = result[col]
+            args.append(val)
+
+        conn.execute(query, (timestamp, ) + tuple(args))
         conn.commit()
 
         await self._dispatch_work(columns, timestamp, result)
@@ -42,8 +47,8 @@ class ServiceWorker:
         prechan = columns[1:]
         chans = [f'{chan}:{self.name}' for chan in prechan]
 
-        for idx, chan in enumerate(chans):
-            self.manager.publish(chan, (timestamp, result[idx]))
+        for col, chan in zip(prechan, chans):
+            self.manager.publish(chan, [timestamp, result[col]])
 
     async def _work_loop(self):
         try:
@@ -60,6 +65,10 @@ class ServiceWorker:
             self.log.info('cancelled, stopping')
         except Exception:
             self.log.exception('fail on work loop, retrying')
+            try:
+                self.manager.state[self.name]['status'] = False
+            except KeyError:
+                pass
             await self._work_loop()
 
     def stop(self):