Add snapshotting for CIPD packages and dimensions to DM.

dm/api/distributor/swarming/v1/cipd.go

+// Copyright 2016 The LUCI Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+package swarmingV1
+
+import (
+        "sort"
+
+        swarm "github.com/luci/luci-go/common/api/swarming/swarming/v1"
+)
+
+// ToCipdPackage converts this to a swarming api SwarmingRpcsCipdPackage.
+func (c *CipdPackage) ToCipdPackage() *swarm.SwarmingRpcsCipdPackage {
+        if c == nil {
+                return nil
+        }
+        return &swarm.SwarmingRpcsCipdPackage{PackageName: c.Name, Version: c.Version}
+}
+
+// ToCipdInput converts this to a swarming api SwarmingRpcsCipdInput.
+func (c *CipdSpec) ToCipdInput() *swarm.SwarmingRpcsCipdInput {
+        if c == nil || c.Client == nil && len(c.ByPath) == 0 {
+                return nil
+        }
+        ret := &swarm.SwarmingRpcsCipdInput{
+                ClientPackage: c.Client.ToCipdPackage(),
+        }
+        if len(c.ByPath) > 0 {
+                count := 0
+                paths := make(sort.StringSlice, 0, len(c.ByPath))
+                for path, pkgs := range c.ByPath {
+                        paths = append(paths, path)
+                        count += len(pkgs.Pkg)
+                }
+                ret.Packages = make([]*swarm.SwarmingRpcsCipdPackage, 0, count)
+                for _, path := range paths {
+                        for _, pkg := range c.ByPath[path].Pkg {
+                                retPkg := pkg.ToCipdPackage()
+                                retPkg.Path = path
+                                ret.Packages = append(ret.Packages, retPkg)
+                        }
+                }
+        }
+        return ret
+}