changelog: Added CLI application and tests

main.go contains the CLI application for the COS Changelog project. It takes 2 build numbers as an input and outputs 2 JSON files containing the commit differences between them. This file is responsible for accepting user input, creating an authenticator object, passing arguments to the Changelog function in the Changelog package, converting the output to JSON, and writing the resulting JSON to a file. Changelog generation is handled by the Changelog package.

BUG=b/160901711
TEST=unittests, run local

Change-Id: Ic670f90328b4097c398c5ed7c9e8366f4a5ba864
diff --git a/src/cmd/changelog/main.go b/src/cmd/changelog/main.go
new file mode 100755
index 0000000..fa29575
--- /dev/null
+++ b/src/cmd/changelog/main.go
@@ -0,0 +1,124 @@
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file contains the CLI application for COS Changelog.
+// Project information available at go/cos-changelog
+//
+// This application is responsible for:
+// 1. Accepting user input and creating the authenticator object used for
+//    queries
+// 2. Calling function in the Changelog package, converting the output
+//    to json, and writing the result into a file
+
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"cos.googlesource.com/cos/tools/pkg/changelog"
+
+	"github.com/google/martian/log"
+	"github.com/urfave/cli/v2"
+	"go.chromium.org/luci/auth"
+	"go.chromium.org/luci/common/api/gerrit"
+	"go.chromium.org/luci/hardcoded/chromeinfra"
+)
+
+// Default Manifest location
+const (
+	cosInstanceURL      string = "cos.googlesource.com"
+	defaultManifestRepo string = "cos/manifest-snapshots"
+)
+
+func getAuthenticator() *auth.Authenticator {
+	opts := chromeinfra.DefaultAuthOptions()
+	opts.Scopes = []string{gerrit.OAuthScope, auth.OAuthScopeEmail}
+	return auth.NewAuthenticator(context.Background(), auth.InteractiveLogin, opts)
+}
+
+func writeChangelogAsJSON(source string, target string, changes map[string][]*changelog.Commit) error {
+	jsonData, err := json.MarshalIndent(changes, "", "    ")
+	if err != nil {
+		return fmt.Errorf("writeChangelogAsJSON: Error marshalling changelog from: %s to: %s\n%v", source, target, err)
+	}
+	fileName := fmt.Sprintf("%s -> %s.json", source, target)
+	if err = ioutil.WriteFile(fileName, jsonData, 0644); err != nil {
+		return fmt.Errorf("writeChangelogAsJSON: Error writing changelog to file: %s\n%v", fileName, err)
+	}
+	return nil
+}
+
+func generateChangelog(source, target, instance, manifestRepo string) {
+	start := time.Now()
+	authenticator := getAuthenticator()
+	sourceToTargetChanges, targetToSourceChanges, err := changelog.Changelog(authenticator, source, target, instance, manifestRepo)
+	if err != nil {
+		log.Infof("generateChangelog: error retrieving changelog between builds %s and %s on GoB instance: %s with manifest repository: %s\n%v\n",
+			source, target, instance, manifestRepo, err)
+		os.Exit(1)
+	}
+	if err := writeChangelogAsJSON(source, target, sourceToTargetChanges); err != nil {
+		log.Infof("generateChangelog: error writing first changelog with source: %s and target: %s\n%v\n",
+			source, target, err)
+	}
+	if err := writeChangelogAsJSON(target, source, targetToSourceChanges); err != nil {
+		log.Infof("generateChangelog: Error writing second changelog with source: %s and target: %s\n%v\n",
+			target, source, err)
+	}
+	log.Infof("Retrieved changelog in %s\n", time.Since(start))
+}
+
+func main() {
+	var instance, manifestRepo string
+	app := &cli.App{
+		Name:  "changelog",
+		Usage: "get commits between builds",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:        "instance",
+				Value:       cosInstanceURL,
+				Aliases:     []string{"i"},
+				Usage:       "GoB `INSTANCE` to use as client",
+				Destination: &instance,
+			},
+			&cli.StringFlag{
+				Name:        "repo",
+				Value:       defaultManifestRepo,
+				Aliases:     []string{"r"},
+				Usage:       "`REPO` containing Manifest file",
+				Destination: &manifestRepo,
+			},
+		},
+		Action: func(c *cli.Context) error {
+			if c.NArg() < 2 {
+				return errors.New("Must specify source and target build number")
+			}
+			source := c.Args().Get(0)
+			target := c.Args().Get(1)
+			generateChangelog(source, target, instance, manifestRepo)
+			return nil
+		},
+	}
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Infof("main: error running app with arguments: %v:\n%v", os.Args, err)
+		os.Exit(1)
+	}
+}
diff --git a/src/cmd/changelog/main_test.py b/src/cmd/changelog/main_test.py
new file mode 100644
index 0000000..251a9ad
--- /dev/null
+++ b/src/cmd/changelog/main_test.py
@@ -0,0 +1,167 @@
+# Copyright 2020 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http:#www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import subprocess
+import unittest
+import json
+import os
+
+
+def get_filename(source, target):
+    return source + ' -> ' + target + '.json'
+
+
+def check_file_exists(source, target):
+    return os.path.exists(get_filename(source, target))
+
+
+def delete_logs(source, target):
+    try:
+        os.remove(get_filename(source, target))
+        os.remove(get_filename(target, source))
+    except OSError:
+        pass
+
+
+def check_empty_json_file(source, target):
+    with open(get_filename(source, target)) as f:
+        return f.read() == '{}'
+
+
+def check_commit_schema(commit):
+    schema = {
+        "SHA": str,
+        "AuthorName": str,
+        "CommitterName": str,
+        "Subject": str,
+        "Bugs": list,
+        "CommitTime": str,
+        "ReleaseNote": str
+    }
+    for attr, attrType in schema.items():
+        if attr not in commit:
+            return False
+        elif not isinstance(commit[attr], attrType):
+            return False
+    return True
+
+
+def check_changelog_schema(source, target):
+    with open(get_filename(source, target)) as f:
+        data = json.load(f)
+        if len(data) == 0:
+            return False
+        for repo, commit_log in data.items():
+            for commit in commit_log:
+                if not check_commit_schema(commit):
+                    return False
+    return True
+
+
+class TestCLIApplication(unittest.TestCase):
+
+    def test_build(self):
+        process = subprocess.run(["go", "build", "-o", "changelog","main.go"])
+        assert process.returncode == 0
+
+    def test_basic_run(self):
+        source = "15050.0.0"
+        target = "15056.0.0"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", source, target])
+        assert process.returncode == 0
+        assert check_file_exists(source, target)
+        assert check_file_exists(target, source)
+        assert check_changelog_schema(source, target)
+        assert check_empty_json_file(target, source)
+
+    def test_with_instance_and_repo(self):
+        source = "15048.0.0"
+        target = "15049.0.0"
+        instance = "cos.googlesource.com"
+        repo = "cos/manifest-snapshots"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", "-i", instance, "-r", repo, source, target])
+        assert process.returncode == 0
+        assert check_file_exists(source, target)
+        assert check_file_exists(target, source)
+        assert check_changelog_schema(source, target)
+        assert check_empty_json_file(target, source)
+
+    def test_large_run(self):
+        source = "15055.0.0"
+        target = "15000.0.0"
+        instance = "cos.googlesource.com"
+        repo = "cos/manifest-snapshots"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", "-i", instance, "-r", repo, source, target])
+        assert process.returncode == 0
+        assert check_file_exists(source, target)
+        assert check_file_exists(target, source)
+        assert check_changelog_schema(source, target)
+        assert check_changelog_schema(target, source)
+
+    def test_with_invalid_source(self):
+        source = "99999.0.0"
+        target = "15040.0.0"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", source, target])
+        assert process.returncode != 0
+        assert not check_file_exists(source, target)
+        assert not check_file_exists(target, source)
+
+    def test_with_invalid_target(self):
+        source = "15038.0.0"
+        target = "89981.0.0"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", source, target])
+        assert process.returncode != 0
+        assert not check_file_exists(source, target)
+        assert not check_file_exists(target, source)
+
+    def test_with_invalid_instance(self):
+        source = "15048.0.0"
+        target = "15049.0.0"
+        instance = "cos.gglesource.com"
+        repo = "cos/manifest-snapshots"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", "-i", instance, "-r", repo, source, target])
+        assert process.returncode != 0
+        assert not check_file_exists(source, target)
+        assert not check_file_exists(target, source)
+
+    def test_with_invalid_repo(self):
+        source = "15048.0.0"
+        target = "15049.0.0"
+        instance = "cos.googlesource.com"
+        repo = "cos/not-manifest-snapshots"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", "-i", instance, "-r", repo, source, target])
+        assert process.returncode != 0
+        assert not check_file_exists(source, target)
+        assert not check_file_exists(target, source)
+
+    def test_with_same_source_and_target(self):
+        source = "15056.0.0"
+        target = "15056.0.0"
+        delete_logs(source, target)
+        process = subprocess.run(["./changelog", source, target])
+        assert process.returncode == 0
+        assert check_file_exists(source, target)
+        assert check_file_exists(target, source)
+        assert check_empty_json_file(source, target)
+        assert check_empty_json_file(target, source)
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/src/go.mod b/src/go.mod
new file mode 100644
index 0000000..613c4c8
--- /dev/null
+++ b/src/go.mod
@@ -0,0 +1,16 @@
+module cos.googlesource.com/cos/tools
+
+go 1.14
+
+require (
+	cloud.google.com/go v0.61.0 // indirect
+	github.com/beevik/etree v1.1.0
+	github.com/google/martian v2.1.0+incompatible
+	github.com/julienschmidt/httprouter v1.3.0 // indirect
+	github.com/mitchellh/go-homedir v1.1.0 // indirect
+	github.com/urfave/cli/v2 v2.2.0
+	go.chromium.org/luci v0.0.0-20200715073306-edba25a92a1f
+	golang.org/x/tools v0.0.0-20200716193322-f2c07d7d8ec1 // indirect
+	google.golang.org/genproto v0.0.0-20200715011427-11fb19a81f2c // indirect
+	google.golang.org/protobuf v1.25.0
+)
diff --git a/src/go.sum b/src/go.sum
new file mode 100644
index 0000000..a0d91c6
--- /dev/null
+++ b/src/go.sum
@@ -0,0 +1,379 @@
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