Monorail client in Go

go/src/infra/monorail/validation.go

Index: go/src/infra/monorail/validation.go
diff --git a/go/src/infra/monorail/validation.go b/go/src/infra/monorail/validation.go
new file mode 100644
index 0000000000000000000000000000000000000000..e2448d1c1a48e9ad8e1e9d150dbc7451ca6acd94
--- /dev/null
+++ b/go/src/infra/monorail/validation.go
@@ -0,0 +1,93 @@
+// 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.
+
+package monorail
+
+import "fmt"
+
+// Validate checks the message for errors.
+func (i *IssueRef) Validate() error {
+	if i == nil {
+		return fmt.Errorf("is nil")
+	}
+	if i.ProjectId == "" {
+		return fmt.Errorf("no projectId")
+	}
+	if i.IssueId == 0 {
+		return fmt.Errorf("no issueId")
+	}
+	return nil
+}
+
+// Validate checks the message for errors.
+func (a *AtomPerson) Validate() error {
+	if a == nil {
+		return fmt.Errorf("is nil")
+	}
+	if a.Name == "" {
+		return fmt.Errorf("no name")
+	}
+	return nil
+}
+
+// Validate checks the message for errors.
+func (i *Issue) Validate() error {
+	if i == nil {
+		return fmt.Errorf("is nil")
+	}
+	if i.Status == "" {
+		return fmt.Errorf("no status")
+	}
+	for _, ref := range i.BlockedOn {
+		if err := ref.Validate(); err != nil {
+			return fmt.Errorf("blockedOn: %s", err)
+		}
+	}
+
+	seen := map[string]struct{}{}
+	for _, cc := range i.Cc {
+		if err := cc.Validate(); err != nil {
+			return fmt.Errorf("cc: %s", err)
+		}
+		// Monorail does not like duplicates in CC list.
+		if _, saw := seen[cc.Name]; saw {
+			return fmt.Errorf("cc: duplicate %s", cc.Name)
+		}
+		seen[cc.Name] = struct{}{}
+	}
+
+	for _, c := range i.Components {
+		if c == "" {
+			return fmt.Errorf("empty component")
+		}
+	}
+
+	for _, label := range i.Labels {
+		if label == "" {
+			return fmt.Errorf("empty label")
+		}
+	}
+
+	if i.Owner != nil {
+		if err := i.Owner.Validate(); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Validate checks the message for errors.
+func (i *InsertIssueRequest) Validate() error {
+	if i.ProjectId == "" {
+		return fmt.Errorf("no projectId")
+	}
+	if err := i.Issue.Validate(); err != nil {
+		return fmt.Errorf("issue: %s", err)
+	}
+	if i.Issue.Id != 0 {
+		return fmt.Errorf("issue: must not have id")
+	}
+	return nil
+}