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vendor/google.golang.org/appengine/capability/capability.go

@@ -0,0 +1,52 @@
+// Copyright 2011 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+/*
+Package capability exposes information about outages and scheduled downtime
+for specific API capabilities.
+
+This package does not work in App Engine "flexible environment".
+
+Example:
+	if !capability.Enabled(c, "datastore_v3", "write") {
+		// show user a different page
+	}
+*/
+package capability // import "google.golang.org/appengine/capability"
+
+import (
+	"golang.org/x/net/context"
+
+	"google.golang.org/appengine/internal"
+	"google.golang.org/appengine/log"
+
+	pb "google.golang.org/appengine/internal/capability"
+)
+
+// Enabled returns whether an API's capabilities are enabled.
+// The wildcard "*" capability matches every capability of an API.
+// If the underlying RPC fails (if the package is unknown, for example),
+// false is returned and information is written to the application log.
+func Enabled(ctx context.Context, api, capability string) bool {
+	req := &pb.IsEnabledRequest{
+		Package:    &api,
+		Capability: []string{capability},
+	}
+	res := &pb.IsEnabledResponse{}
+	if err := internal.Call(ctx, "capability_service", "IsEnabled", req, res); err != nil {
+		log.Warningf(ctx, "capability.Enabled: RPC failed: %v", err)
+		return false
+	}
+	switch *res.SummaryStatus {
+	case pb.IsEnabledResponse_ENABLED,
+		pb.IsEnabledResponse_SCHEDULED_FUTURE,
+		pb.IsEnabledResponse_SCHEDULED_NOW:
+		return true
+	case pb.IsEnabledResponse_UNKNOWN:
+		log.Errorf(ctx, "capability.Enabled: unknown API capability %s/%s", api, capability)
+		return false
+	default:
+		return false
+	}
+}