add adapter_spec to adapters, basic db stuff

lib/adapters/elixire.ex

@@ -1,18 +1,12 @@
 defmodule Elstat.Adapter.Elixire do
   @behaviour Elstat.Adapter
 
-  use GenServer
-  require Logger
-
-  def start_link(service_opts) do
-    GenServer.start_link(__MODULE__, service_opts, [])
+  def adapter_spec do
+    %{
+      db_columns: [:status, :latency]
+    }
   end
-
-  def init(service_opts) do
-    Logger.info("Elixire adapter started with #{inspect service_opts}")
-    {:ok, %{}}
-  end
-
+  
   def check(args) do
     addr = args.base_url
 

lib/adapters/ping.ex

@@ -1,18 +1,12 @@
 defmodule Elstat.Adapter.Ping do
   @behaviour Elstat.Adapter
  
-  use GenServer
-  require Logger
-
-  def start_link(service_opts) do
-    GenServer.start_link(__MODULE__, service_opts, [])
+  def adapter_spec do
+    %{
+      db_columns: [:status]
+    }
   end
-
-  def init(service_opts) do
-    Logger.info("Ping started with #{inspect service_opts}")
-    {:ok, %{}}
-  end
-
+  
   def check(args) do
     {cmd_output, _} = System.cmd("ping", ["-c", "1", args.address])
     alive? = not Regex.match?(~r/100(\.0)?% packet loss/, cmd_output)

lib/manager.ex

@@ -73,8 +73,46 @@ defmodule Elstat.Manager do
     services = Application.fetch_env!(:elstat, :services)
 
     Sqlitex.with_db('elstat.db', fn(db) ->
-      Enum.each(services, fn service ->
-        
+      services
+      |> Map.keys
+      |> Enum.each(fn service_id ->
+        service = services[service_id]
+        adapter = service.adapter
+
+        spec = adapter.adapter_spec
+
+        columns = %{
+          status: "status bool",
+          latency: "latency bigint",
+        }
+
+        column_res = spec.db_columns
+        |> Enum.map(fn column ->
+          columns[column]
+        end)
+        |> Enum.join(",\n")
+
+        timestamp_column = if Enum.count(spec.db_columns) == 0 do
+          "timestamp bigint"
+        else
+          "timestamp bigint,"
+        end
+
+        query = """
+        CREATE TABLE IF NOT EXISTS #{Atom.to_string service_id} (
+        #{timestamp_column}
+        #{column_res}
+        );
+        """
+
+        Logger.debug "query for #{inspect service_id}: #{query}"
+
+        case Sqlitex.query(db, query) do
+          {:ok, _} ->
+            Logger.info "created table for #{inspect service_id}"
+          {:error, _err} ->
+            Logger.error "error making table for #{inspect service_id}"
+        end
       end)
     end)
     
@@ -91,7 +129,7 @@ defmodule Elstat.Manager do
       data = state.serv_state[key]
       desc = state.services[key].description
 
-      result = case data do
+      case data do
         {:map, data_map} ->
           {key, Map.put(data_map, :description, desc)}
         {:bool, data_bool} ->