Add handler for /latest/{platform}[/{test}] urls

latest_results_redirect_handler.go

@@ -0,0 +1,102 @@
+// Copyright 2017 Google Inc.
+//
+// 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 wptdashboard
+
+import (
+    "errors"
+    "fmt"
+    "net/http"
+    "regexp"
+    "strings"
+
+    "appengine"
+    "appengine/datastore"
+)
+
+// This handler is responsible for redirecting to the Google Cloud Storage API
+// JSON blob for the latest TestRun for the given browser.
+//
+// URL format:
+// /latest/{browser}[/{test}]
+func latestResultsRedirectHandler(w http.ResponseWriter, r *http.Request) {
+    remainingPath := strings.Replace(r.URL.Path, "/latest/", "", 1)
+    pathPieces := strings.SplitN(remainingPath, "/", 2)
+    if len(pathPieces) > 2 {
+      http.Error(w, "Invalid path", http.StatusBadRequest)
+      return
+    }
+
+    latestRun, err := getLatestRun(r, pathPieces[0])
+    if err != nil {
+      http.Error(w, err.Error(), http.StatusInternalServerError)
+      return
+    }
+    if (TestRun{}) == latestRun {
+      http.NotFound(w, r)
+      return
+    }
+
+    var testFile *string
+    if len(pathPieces) > 1 {
+      testFile = &pathPieces[1]
+    }
+    resultsURL := getResultsURL(latestRun, testFile)
+
+    http.Redirect(w, r, resultsURL, http.StatusFound)
+}
+
+func getLatestRun(r *http.Request, browser string) (latest TestRun, err error) {
+    browserPieces := strings.Split(browser, "-")
+    if len(browserPieces) < 1 || len(browserPieces) > 4 {
+      err = errors.New("Invalid path")
+      return
+    }
+
+    ctx := appengine.NewContext(r)
+    baseQuery := datastore.NewQuery("TestRun").Order("-CreatedAt").Limit(1)
+
+    var testRunResults []TestRun
+    query := baseQuery.Filter("BrowserName =", browserPieces[0])
+    if len(browserPieces) > 1 {
+      query = query.Filter("BrowserVersion =", browserPieces[1])
+    }
+    if len(browserPieces) > 2 {
+      query = query.Filter("OSName =", browserPieces[2])
+    }
+    if len(browserPieces) > 3 {
+      query = query.Filter("OSVersion =", browserPieces[3])
+    }
+    _, err = query.GetAll(ctx, &testRunResults)
+    if err != nil {
+        return
+    }
+    if len(testRunResults) > 0 {
+      latest = testRunResults[0]
+    }
+    return
+}
+
+func getResultsURL(latestRun TestRun, testFile *string) (resultsURL string) {
+    resultsURL = latestRun.ResultsURL
+    if testFile != nil {
+        // Assumes that result files are under a directory named SHA[0:10].
+        resultsBase := strings.SplitAfter(resultsURL, "/" + latestRun.Revision)[0];
+        resultsPieces := strings.Split(resultsURL, "/")
+        re := regexp.MustCompile("(-summary)?\\.json\\.gz$")
+        platform := re.ReplaceAllString(resultsPieces[len(resultsPieces) - 1], "")
+        resultsURL = fmt.Sprintf("%s/%s/%s", resultsBase, platform, *testFile)
+    }
+    return resultsURL
+}

main.go

@@ -25,6 +25,6 @@ func init() {
     http.HandleFunc("/tasks/populate-dev-data", populateDevData)
     http.HandleFunc("/test-runs", testRunHandler)
     http.HandleFunc("/about", aboutHandler)
+    http.HandleFunc("/latest/", latestResultsRedirectHandler)
     http.HandleFunc("/", testHandler)
 }
-