Add infra recipe module, use for updating Go DEPS

infra/bots/recipe_modules/infra/api.py

Index: infra/bots/recipe_modules/infra/api.py
diff --git a/infra/bots/recipe_modules/infra/api.py b/infra/bots/recipe_modules/infra/api.py
new file mode 100644
index 0000000000000000000000000000000000000000..17d3729b87ea7be3647e678a0de578945090c22b
--- /dev/null
+++ b/infra/bots/recipe_modules/infra/api.py
@@ -0,0 +1,32 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+from recipe_engine import recipe_api
+
+
+INFRA_GO_PKG = 'go.skia.org/infra'
+UPDATE_GO_ATTEMPTS = 5
+
+
+class InfraApi(recipe_api.RecipeApi):
+  @property
+  def go_env(self):
+    return {'GOPATH': self.gopath}
+
+  @property
+  def gopath(self):
+    return self.m.vars.checkout_root.join('gopath')
+
+  def update_go_deps(self):
+    """Attempt to update go dependencies.
+
+    This fails flakily sometimes, so perform multiple attempts.
+    """
+    self.m.run.with_retry(
+        self.m.step,
+        'update go pkgs',
+        UPDATE_GO_ATTEMPTS,
+        cmd=['go', 'get', '-u', '%s/...' % INFRA_GO_PKG],
+        env=self.go_env)