Refact: Use new JSON builder

src/engine.liq

@@ -38,13 +38,19 @@ inputs = ref ([])
 def on_metadata_notification(meta) =
     filename = meta["filename"]
     track_duration = request.duration(filename)
-    json_data = json.stringify(meta, compact=true)
-    json_data = url.encode(json_data)
-    json_data = '{ "action": "on_metadata", "meta": "#{json_data}", "track_duration": "#{track_duration}" }'
-    # There's currently an issue with Liquidsoap http.post requests (should be gone with Liquidsoap 2):
-    #headers = [("Content-Type","application/json; charset=utf-8")]
-    #ignore(http.post(headers=headers, data="#{json_data}", "localhost:1337"))
-    ignore(process.run("curl -X POST -H 'Content-Type: application/json' --data '#{json_data}' #{engine_control}"))
+
+    # TODO Post playlog to engine-api directly. This requires some additional show state handling.
+    json_data = json()
+    json_data.add("action", "on_metadata")
+    json_data.add("meta", meta)
+    json_data.add("track_duration", track_duration)
+    playlog = url.encode(json.stringify(json_data))
+
+    log(level=3, "Posting playlog: #{playlog}")
+    # headers = [("Content-Type","application/json; charset=utf-8")]
+    # result = http.post(http_version="1.1", headers=headers, data="#{playlog}", "#{engine_control}")
+    ignore(process.run("curl -X POST -H 'Content-Type: application/json' --data '#{playlog}' #{engine_control}"))
+
 end
 
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