2 files changed, 180 insertions, 0 deletions
diff --git a/third_party/go/git-appraise/review/ci/ci.go b/third_party/go/git-appraise/review/ci/ci.go
new file mode 100644
index 000000000000..b2cfd22743c2
--- /dev/null
+++ b/third_party/go/git-appraise/review/ci/ci.go
@@ -0,0 +1,95 @@
+/*
+Copyright 2015 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.
+*/
+
+// Package ci defines the internal representation of a continuous integration reports.
+package ci
+
+import (
+	"encoding/json"
+	"github.com/google/git-appraise/repository"
+	"sort"
+	"strconv"
+)
+
+const (
+	// Ref defines the git-notes ref that we expect to contain CI reports.
+	Ref = "refs/notes/devtools/ci"
+
+	// StatusSuccess is the status string representing that a build and/or test passed.
+	StatusSuccess = "success"
+	// StatusFailure is the status string representing that a build and/or test failed.
+	StatusFailure = "failure"
+
+	// FormatVersion defines the latest version of the request format supported by the tool.
+	FormatVersion = 0
+)
+
+// Report represents a build/test status report generated by a continuous integration tool.
+//
+// Every field is optional.
+type Report struct {
+	Timestamp string `json:"timestamp,omitempty"`
+	URL       string `json:"url,omitempty"`
+	Status    string `json:"status,omitempty"`
+	Agent     string `json:"agent,omitempty"`
+	// Version represents the version of the metadata format.
+	Version int `json:"v,omitempty"`
+}
+
+// Parse parses a CI report from a git note.
+func Parse(note repository.Note) (Report, error) {
+	bytes := []byte(note)
+	var report Report
+	err := json.Unmarshal(bytes, &report)
+	return report, err
+}
+
+// GetLatestCIReport takes the collection of reports and returns the one with the most recent timestamp.
+func GetLatestCIReport(reports []Report) (*Report, error) {
+	timestampReportMap := make(map[int]*Report)
+	var timestamps []int
+
+	for _, report := range reports {
+		timestamp, err := strconv.Atoi(report.Timestamp)
+		if err != nil {
+			return nil, err
+		}
+		timestamps = append(timestamps, timestamp)
+		timestampReportMap[timestamp] = &report
+	}
+	if len(timestamps) == 0 {
+		return nil, nil
+	}
+	sort.Sort(sort.Reverse(sort.IntSlice(timestamps)))
+	return timestampReportMap[timestamps[0]], nil
+}
+
+// ParseAllValid takes collection of git notes and tries to parse a CI report
+// from each one. Any notes that are not valid CI reports get ignored, as we
+// expect the git notes to be a heterogenous list, with only some of them
+// being valid CI status reports.
+func ParseAllValid(notes []repository.Note) []Report {
+	var reports []Report
+	for _, note := range notes {
+		report, err := Parse(note)
+		if err == nil && report.Version == FormatVersion {
+			if report.Status == "" || report.Status == StatusSuccess || report.Status == StatusFailure {
+				reports = append(reports, report)
+			}
+		}
+	}
+	return reports
+}
diff --git a/third_party/go/git-appraise/review/ci/ci_test.go b/third_party/go/git-appraise/review/ci/ci_test.go
new file mode 100644
index 000000000000..c141f053d94d
--- /dev/null
+++ b/third_party/go/git-appraise/review/ci/ci_test.go
@@ -0,0 +1,85 @@
+/*
+Copyright 2015 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.
+*/
+
+package ci
+
+import (
+	"github.com/google/git-appraise/repository"
+	"testing"
+)
+
+const testCINote1 = `{
+	"Timestamp": "4",
+	"URL": "www.google.com",
+	"Status": "success"
+}`
+
+const testCINote2 = `{
+	"Timestamp": "16",
+	"URL": "www.google.com",
+	"Status": "failure"
+}`
+
+const testCINote3 = `{
+	"Timestamp": "30",
+	"URL": "www.google.com",
+	"Status": "something else"
+}`
+
+const testCINote4 = `{
+	"Timestamp": "28",
+	"URL": "www.google.com",
+	"Status": "success"
+}`
+
+const testCINote5 = `{
+	"Timestamp": "27",
+	"URL": "www.google.com",
+	"Status": "success"
+}`
+
+func TestCIReport(t *testing.T) {
+	latestReport, err := GetLatestCIReport(ParseAllValid([]repository.Note{
+		repository.Note(testCINote1),
+		repository.Note(testCINote2),
+	}))
+	if err != nil {
+		t.Fatal("Failed to properly fetch the latest report", err)
+	}
+	expected, err := Parse(repository.Note(testCINote2))
+	if err != nil {
+		t.Fatal("Failed to parse the expected report", err)
+	}
+	if *latestReport != expected {
+		t.Fatal("This is not the latest ", latestReport)
+	}
+	latestReport, err = GetLatestCIReport(ParseAllValid([]repository.Note{
+		repository.Note(testCINote1),
+		repository.Note(testCINote2),
+		repository.Note(testCINote3),
+		repository.Note(testCINote4),
+	}))
+	if err != nil {
+		t.Fatal("Failed to properly fetch the latest report", err)
+	}
+	expected, err = Parse(repository.Note(testCINote4))
+	if err != nil {
+		t.Fatal("Failed to parse the expected report", err)
+	}
+	if *latestReport != expected {
+		t.Fatal("This is not the latest ", latestReport)
+	}
+}