frontend: show submittable status and URL, add runner, revamp logging

7 files changed, 186 insertions, 56 deletions

diff --git a/frontend/frontend.go b/frontend/frontend.go
index 240c04ae3e2d..0718bb136d1f 100644
--- a/frontend/frontend.go
+++ b/frontend/frontend.go
@@ -10,6 +10,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/rakyll/statik/fs"
 
+	"github.com/tweag/gerrit-queue/gerrit"
 	_ "github.com/tweag/gerrit-queue/statik" // register static assets
 	"github.com/tweag/gerrit-queue/submitqueue"
 )
@@ -21,13 +22,13 @@ type Frontend struct {
 }
 
 //loadTemplate loads a single template from statikFS and returns a template object
-func loadTemplate(templateName string) (*template.Template, error) {
+func loadTemplate(templateName string, funcMap template.FuncMap) (*template.Template, error) {
 	statikFS, err := fs.New()
 	if err != nil {
 		return nil, err
 	}
 
-	tmpl := template.New(templateName)
+	tmpl := template.New(templateName).Funcs(funcMap)
 	r, err := statikFS.Open("/" + templateName)
 	if err != nil {
 		return nil, err
@@ -41,9 +42,20 @@ func loadTemplate(templateName string) (*template.Template, error) {
 }
 
 // MakeFrontend configures the router and returns a new Frontend struct
-func MakeFrontend(router *gin.Engine, submitQueue *submitqueue.SubmitQueue) *Frontend {
+func MakeFrontend(runner *submitqueue.Runner, submitQueue *submitqueue.SubmitQueue) *Frontend {
+	router := gin.Default()
+
+	funcMap := template.FuncMap{
+		"isAutoSubmittable": func(serie *submitqueue.Serie) bool {
+			return submitQueue.IsAutoSubmittable(serie)
+		},
+		"changesetURL": func(changeset *gerrit.Changeset) string {
+			return submitQueue.GetChangesetURL(changeset)
+		},
+	}
+
+	tmpl := template.Must(loadTemplate("submit-queue.tmpl.html", funcMap))
 
-	tmpl := template.Must(loadTemplate("submit-queue.tmpl.html"))
 	router.SetHTMLTemplate(tmpl)
 
 	router.GET("/submit-queue.json", func(c *gin.Context) {
@@ -77,7 +89,6 @@ func MakeFrontend(router *gin.Engine, submitQueue *submitqueue.SubmitQueue) *Fro
 	}
 }
 
-// Run starts the webserver on a given address
-func (f *Frontend) Run(addr string) error {
-	return f.Router.Run(addr)
+func (f *Frontend) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	f.Router.ServeHTTP(w, r)
 }
diff --git a/gerrit/client.go b/gerrit/client.go
index 5a13befe5463..c65b5016c1ff 100644
--- a/gerrit/client.go
+++ b/gerrit/client.go
@@ -17,13 +17,15 @@ type IClient interface {
 	SubmitChangeset(changeset *Changeset) (*Changeset, error)
 	RebaseChangeset(changeset *Changeset, ref string) (*Changeset, error)
 	RemoveTag(changeset *Changeset, tag string) (*Changeset, error)
+	GetBaseURL() string
 }
 
 var _ IClient = &Client{}
 
 // Client provides some ways to interact with a gerrit instance
 type Client struct {
-	client *goGerrit.Client
+	client  *goGerrit.Client
+	baseURL string
 }
 
 // NewClient initializes a new gerrit client
@@ -38,7 +40,10 @@ func NewClient(URL, username, password string) (*Client, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &Client{client: goGerritClient}, nil
+	return &Client{
+		client:  goGerritClient,
+		baseURL: URL,
+	}, nil
 }
 
 // SearchChangesets fetches a list of changesets matching a passed query string
@@ -117,3 +122,8 @@ func (gerrit *Client) RemoveTag(changeset *Changeset, tag string) (*Changeset, e
 	// https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#set-hashtags
 	return changeset, nil
 }
+
+// GetBaseURL returns the gerrit base URL
+func (gerrit *Client) GetBaseURL() string {
+	return gerrit.baseURL
+}
diff --git a/main.go b/main.go
index 9bd8cd1feab1..1f64c7759132 100644
--- a/main.go
+++ b/main.go
@@ -4,16 +4,16 @@ package main
 
 import (
 	"os"
+	"time"
+
+	"net/http"
 
 	"github.com/tweag/gerrit-queue/frontend"
 	"github.com/tweag/gerrit-queue/gerrit"
 	"github.com/tweag/gerrit-queue/submitqueue"
 
-	"github.com/gin-gonic/gin"
 	"github.com/urfave/cli"
 
-	"fmt"
-
 	log "github.com/sirupsen/logrus"
 )
 
@@ -88,31 +88,29 @@ func main() {
 		log.Printf("Successfully connected to gerrit at %s", URL)
 
 		submitQueue := submitqueue.MakeSubmitQueue(gerritClient, projectName, branchName, submitQueueTag)
+		runner := submitqueue.NewRunner(submitQueue)
 
-		router := gin.Default()
-		frontend := frontend.MakeFrontend(router, &submitQueue)
+		handler := frontend.MakeFrontend(runner, submitQueue)
 
-		err = submitQueue.LoadSeries()
-		if err != nil {
-			log.Errorf("Error loading submit queue: %s", err)
-		}
+		// fetch only on first run
+		runner.Trigger(true)
 
-		fmt.Println()
-		fmt.Println()
-		fmt.Println()
-		fmt.Println()
-		for _, serie := range submitQueue.Series {
-			fmt.Println(fmt.Sprintf("%s", serie))
-			for _, changeset := range serie.ChangeSets {
-				fmt.Println(fmt.Sprintf(" - %s", changeset.String()))
+		// ticker
+		go func() {
+			for {
+				time.Sleep(time.Minute * 10)
+				runner.Trigger(fetchOnly)
 			}
-			fmt.Println()
-		}
+		}()
 
-		frontend.Run(":8080")
+		server := http.Server{
+			Addr:    ":8080",
+			Handler: handler,
+		}
 
-		if fetchOnly {
-			//return backlog.Run()
+		server.ListenAndServe()
+		if err != nil {
+			log.Fatal(err)
 		}
 
 		return nil
diff --git a/public/submit-queue.tmpl.html b/public/submit-queue.tmpl.html
index f1320a0c2dde..cad001cd3dbd 100644
--- a/public/submit-queue.tmpl.html
+++ b/public/submit-queue.tmpl.html
@@ -9,13 +9,17 @@
   <h1>Gerrit Submit Queue</h1>
   <h2>{{ .projectName }}/{{ .branchName }} is at {{ printf "%.7s" .HEAD }}</h2>
   <h2>Current Queue:</h2>
+  <div class="card-columns">
+
   {{ range $serie := .series }}
+
+  <div class="card" style="width: 18rem">
   <div class="list-group">
     {{ range $changeset := $serie.ChangeSets}}
-    <div class="list-group-item">
+    <div class="list-group-item{{ if not ($serie | isAutoSubmittable) }} disabled{{ end }}">
       <div class="d-flex w-100 justify-content-between">
         <h5>{{ $changeset.Subject }}</h5>
-        <small>#{{ $changeset.Number }}</small>
+        <small><a href="{{ changesetURL $changeset }}" target="_blank">#{{ $changeset.Number }}</a></small>
       </div>
       <div class="d-flex w-100 justify-content-between">
           <small>{{ $changeset.OwnerName }}</small>
@@ -32,7 +36,8 @@
     </div>
     {{ end }}
   </div>
-  <br />
+  </div>
   {{ end }}
+  </div>
 </body>
 </html>
diff --git a/submitqueue/runner.go b/submitqueue/runner.go
new file mode 100644
index 000000000000..2c84a7d69b7f
--- /dev/null
+++ b/submitqueue/runner.go
@@ -0,0 +1,60 @@
+package submitqueue
+
+import (
+	"sync"
+	"time"
+)
+
+// Runner supervises the submit queue and records historical data about it
+type Runner struct {
+	mut              sync.Mutex
+	submitQueue      *SubmitQueue
+	currentlyRunning *time.Time
+	results          []*Result
+}
+
+func NewRunner(sq *SubmitQueue) *Runner {
+	return &Runner{
+		submitQueue: sq,
+		results:     []*Result{},
+	}
+}
+
+// For the frontend to consume the data
+// TODO: extend to return all the submitQueue results
+func (r *Runner) GetResults() (*time.Time, []*Result) {
+	r.mut.Lock()
+	defer r.mut.Unlock()
+	return r.currentlyRunning, r.results
+}
+
+// Trigger starts a new batch job
+// TODO: make sure only one batch job is started at the same time
+// if a batch job is already started, ignore the newest request
+// TODO: be more granular in dry-run mode
+func (r *Runner) Trigger(fetchOnly bool) {
+	r.mut.Lock()
+	if r.currentlyRunning != nil {
+		return
+	}
+	now := time.Now()
+	r.currentlyRunning = &now
+	r.mut.Unlock()
+
+	defer func() {
+		r.mut.Lock()
+		r.currentlyRunning = nil
+		r.mut.Unlock()
+	}()
+
+	result := r.submitQueue.Run(fetchOnly)
+
+	r.mut.Lock()
+	// drop tail if size > 10
+	if len(r.results) > 10 {
+		r.results = append([]*Result{result}, r.results[:9]...)
+	} else {
+		r.results = append([]*Result{result}, r.results...)
+	}
+	r.mut.Unlock()
+}
diff --git a/submitqueue/series.go b/submitqueue/series.go
index 42abff2d49be..c607e3ec2135 100644
--- a/submitqueue/series.go
+++ b/submitqueue/series.go
@@ -5,7 +5,7 @@ import (
 
 	"github.com/tweag/gerrit-queue/gerrit"
 
-	log "github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 )
 
 // AssembleSeries consumes a list of `Changeset`, and groups them together to series
@@ -17,12 +17,12 @@ import (
 // and mapParentToSeries, which allows to lookup all series having a certain parent commit id,
 // to prepend to any of the existing series
 // if we can't find anything, we create a new series
-func AssembleSeries(changesets []*gerrit.Changeset) ([]*Serie, error) {
+func AssembleSeries(changesets []*gerrit.Changeset, log *logrus.Logger) ([]*Serie, error) {
 	series := make([]*Serie, 0)
 	mapLeafToSerie := make(map[string]*Serie, 0)
 
 	for _, changeset := range changesets {
-		logger := log.WithFields(log.Fields{
+		logger := log.WithFields(logrus.Fields{
 			"changeset": changeset.String(),
 		})
 
@@ -90,7 +90,7 @@ func AssembleSeries(changesets []*gerrit.Changeset) ([]*Serie, error) {
 
 	// Check integrity, just to be on the safe side.
 	for _, serie := range series {
-		logger := log.WithFields(log.Fields{
+		logger := log.WithFields(logrus.Fields{
 			"serie": serie.String(),
 		})
 		logger.Debugf("checking integrity")
diff --git a/submitqueue/submitqueue.go b/submitqueue/submitqueue.go
index 922ca323483d..0b61143439f9 100644
--- a/submitqueue/submitqueue.go
+++ b/submitqueue/submitqueue.go
@@ -2,10 +2,11 @@ package submitqueue
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/tweag/gerrit-queue/gerrit"
 
-	log "github.com/sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 )
 
 // SubmitQueue contains a list of series, a gerrit connection, and some project configuration
@@ -16,11 +17,12 @@ type SubmitQueue struct {
 	BranchName     string
 	HEAD           string
 	SubmitQueueTag string // the tag used to submit something to the submit queue
+	URL            string
 }
 
 // MakeSubmitQueue builds a new submit queue
-func MakeSubmitQueue(gerritClient gerrit.IClient, projectName string, branchName string, submitQueueTag string) SubmitQueue {
-	return SubmitQueue{
+func MakeSubmitQueue(gerritClient gerrit.IClient, projectName string, branchName string, submitQueueTag string) *SubmitQueue {
+	return &SubmitQueue{
 		Series:         make([]*Serie, 0),
 		gerrit:         gerritClient,
 		ProjectName:    projectName,
@@ -30,7 +32,7 @@ func MakeSubmitQueue(gerritClient gerrit.IClient, projectName string, branchName
 }
 
 // LoadSeries fills .Series by searching changesets, and assembling them to Series.
-func (s *SubmitQueue) LoadSeries() error {
+func (s *SubmitQueue) LoadSeries(log *logrus.Logger) error {
 	var queryString = fmt.Sprintf("status:open project:%s branch:%s", s.ProjectName, s.BranchName)
 	log.Debugf("Running query %s", queryString)
 
@@ -41,7 +43,7 @@ func (s *SubmitQueue) LoadSeries() error {
 	}
 
 	// Assemble to series
-	series, err := AssembleSeries(changesets)
+	series, err := AssembleSeries(changesets, log)
 	if err != nil {
 		return err
 	}
@@ -75,12 +77,19 @@ func (s *SubmitQueue) IsAutoSubmittable(serie *Serie) bool {
 	})
 }
 
+// GetChangesetURL returns the URL to view a given changeset
+func (s *SubmitQueue) GetChangesetURL(changeset *gerrit.Changeset) string {
+	return fmt.Sprintf("%s/c/%s/+/%d", s.gerrit.GetBaseURL(), s.ProjectName, changeset.Number)
+}
+
 // DoSubmit submits changes that can be submitted,
 // and updates `Series` to contain the remaining ones
 // Also updates `HEAD`.
-func (s *SubmitQueue) DoSubmit() error {
+func (s *SubmitQueue) DoSubmit(log *logrus.Logger) error {
 	var remainingSeries []*Serie
 
+	// TODO: actually log more!
+
 	for _, serie := range s.Series {
 		serieParentCommitIDs, err := serie.GetParentCommitIDs()
 		if err != nil {
@@ -124,12 +133,12 @@ func (s *SubmitQueue) DoSubmit() error {
 // After a DoRebase, consumers are supposed to fetch state again via LoadSeries,
 // as things most likely have changed, and error handling during partially failed rebases
 // is really tricky
-func (s *SubmitQueue) DoRebase() error {
+func (s *SubmitQueue) DoRebase(log *logrus.Logger) error {
 	if s.HEAD == "" {
 		return fmt.Errorf("current HEAD is an empty string, bailing out")
 	}
 	for _, serie := range s.Series {
-		logger := log.WithFields(log.Fields{
+		logger := log.WithFields(logrus.Fields{
 			"serie": serie,
 		})
 		if !s.IsAutoSubmittable(serie) {
@@ -157,36 +166,73 @@ func (s *SubmitQueue) DoRebase() error {
 	return nil
 }
 
+// Problem: no inspection during the run
+// Problem: record the state
+
+type Result struct {
+	LogEntries []*logrus.Entry
+	Series     []Serie
+	Error      error
+}
+
+func (r Result) StartTime() time.Time {
+	return r.LogEntries[0].Time
+}
+
+func (r Result) EndTime() time.Time {
+	return r.LogEntries[len(r.LogEntries)-1].Time
+}
+
+func (r *Result) Fire(entry *logrus.Entry) error {
+	r.LogEntries = append(r.LogEntries, entry)
+	return nil
+}
+
+func (r *Result) Levels() []logrus.Level {
+	return logrus.AllLevels
+}
+
 // Run starts the submit and rebase logic.
-func (s *SubmitQueue) Run() error {
+func (s *SubmitQueue) Run(fetchOnly bool) *Result {
+	r := &Result{}
 	//TODO: log decisions made and add to some ring buffer
 	var err error
 
+	log := logrus.New()
+	log.AddHook(r)
+
 	commitID, err := s.gerrit.GetHEAD(s.ProjectName, s.BranchName)
 	if err != nil {
 		log.Errorf("Unable to retrieve HEAD of branch %s at project %s: %s", s.BranchName, s.ProjectName, err)
-		return err
+		r.Error = err
+		return r
 	}
 	s.HEAD = commitID
 
-	err = s.LoadSeries()
+	err = s.LoadSeries(log)
 	if err != nil {
-		return err
+		r.Error = err
+		return r
 	}
 	if len(s.Series) == 0 {
 		// Nothing to do!
 		log.Warn("Nothing to do here")
-		return nil
+		return r
+	}
+	if fetchOnly {
+		return r
 	}
-	err = s.DoSubmit()
+	err = s.DoSubmit(log)
 	if err != nil {
-		return err
+		r.Error = err
+		return r
 	}
-	err = s.DoRebase()
+	err = s.DoRebase(log)
 	if err != nil {
-		return err
+		r.Error = err
+		return r
 	}
-	return nil
+	return r
 }
 
 // RebaseSerie rebases a whole serie on top of a given ref