initial middleware refactor

config/example.yaml

@@ -0,0 +1,39 @@
+# Copyright 2016 The Chihaya Authors. All rights reserved.
+# Use of this source code is governed by the BSD 2-Clause license,
+# which can be found in the LICENSE file.
+
+chihaya:
+  tracker:
+    announce: "10m"
+    minAnnounce: "5m"
+    announceMiddleware:
+      - "prometheus"
+      - "storeClientValidation"
+      - "storeCreateOnAnnounce"
+    scrapeMiddleware:
+      - "prometheus"
+      - "storeClientValidation"
+
+  servers:
+    - name: "store"
+      config:
+        addr: "localhost:6880"
+        requestTimeout: "10s"
+        readTimeout: "10s"
+        writeTimeout: "10s"
+        clientStore: "memory"
+        peerStore: "memory"
+        peerStoreConfig:
+          gcAfter: "30m"
+          shards: 1
+
+    - name: "http"
+    config:
+      addr: "localhost:6881"
+      requestTimeout: "10s"
+      readTimeout: "10s"
+      writeTimeout: "10s"
+
+    - name: "udp"
+      config:
+        addr: "localhost:6882"