dashboard/app: implement bug notifications/actions

Currently dashboard can only report new bugs and add reproducers
to already reported bugs.
This change adds infrastructure for the dashboard to actively act
on existing bugs in different ways. 4 new notifications (actions) added:
 - dashboard can auto-upstream bugs from moderation after an embargo period
 - dashboard can auto-upstream bugs if reporting criteria changes
   (e.g. it reported a bug into moderation because there was no repro,
   but then repro appears and the bug is automatically sent upstream)
 - dashboard detects when a fixing commit does not appear in any tested trees
   for too long and sends a notification about this
 - dashboard detects stale bugs (last happened monts ago, no repro, no activity)
   and auto-invalidates them
This will also be useful to send pings for old bugs and do other automation.

1 files changed, 60 insertions, 9 deletions

diff --git a/dashboard/dashapi/dashapi.go b/dashboard/dashapi/dashapi.go
index 02d7ea132..ed95d0f38 100644
--- a/dashboard/dashapi/dashapi.go
+++ b/dashboard/dashapi/dashapi.go
@@ -262,6 +262,7 @@ type BugReport struct {
 	JobID             string
 	ExtID             string // arbitrary reporting ID forwarded from BugUpdate.ExtID
 	First             bool   // Set for first report for this bug.
+	Moderation        bool
 	Title             string
 	Maintainers       []string
 	CC                []string // additional CC emails
@@ -297,15 +298,17 @@ type BugReport struct {
 }
 
 type BugUpdate struct {
-	ID         string
-	ExtID      string
-	Link       string
-	Status     BugStatus
-	ReproLevel ReproLevel
-	DupOf      string
-	FixCommits []string // Titles of commits that fix this bug.
-	CC         []string // Additional emails to add to CC list in future emails.
-	CrashID    int64
+	ID           string
+	ExtID        string
+	Link         string
+	Status       BugStatus
+	ReproLevel   ReproLevel
+	DupOf        string
+	OnHold       bool     // If set for open bugs, don't upstream this bug.
+	Notification bool     // Reply to a notification.
+	FixCommits   []string // Titles of commits that fix this bug.
+	CC           []string // Additional emails to add to CC list in future emails.
+	CrashID      int64
 }
 
 type BugUpdateReply struct {
@@ -325,6 +328,31 @@ type PollBugsResponse struct {
 	Reports []*BugReport
 }
 
+type BugNotification struct {
+	Type        BugNotif
+	Namespace   string
+	Config      []byte
+	ID          string
+	ExtID       string // arbitrary reporting ID forwarded from BugUpdate.ExtID
+	Title       string
+	Text        string   // meaning depends on Type
+	CC          []string // additional CC emails
+	Maintainers []string
+	// Public is what we want all involved people to see (e.g. if we notify about a wrong commit title,
+	// people need to see it and provide the right title). Not public is what we want to send only
+	// to a minimal set of recipients (our mailing list) (e.g. notification about an obsoleted bug
+	// is mostly "for the record").
+	Public bool
+}
+
+type PollNotificationsRequest struct {
+	Type string
+}
+
+type PollNotificationsResponse struct {
+	Notifications []*BugNotification
+}
+
 type PollClosedRequest struct {
 	IDs []string
 }
@@ -344,6 +372,17 @@ func (dash *Dashboard) ReportingPollBugs(typ string) (*PollBugsResponse, error)
 	return resp, nil
 }
 
+func (dash *Dashboard) ReportingPollNotifications(typ string) (*PollNotificationsResponse, error) {
+	req := &PollNotificationsRequest{
+		Type: typ,
+	}
+	resp := new(PollNotificationsResponse)
+	if err := dash.Query("reporting_poll_notifs", req, resp); err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
 func (dash *Dashboard) ReportingPollClosed(ids []string) ([]string, error) {
 	req := &PollClosedRequest{
 		IDs: ids,
@@ -384,6 +423,7 @@ func (dash *Dashboard) UploadManagerStats(req *ManagerStatsReq) error {
 
 type (
 	BugStatus  int
+	BugNotif   int
 	ReproLevel int
 )
 
@@ -396,6 +436,17 @@ const (
 )
 
 const (
+	// Upstream bug into next reporting.
+	// If the action succeeds, reporting sends BugStatusUpstream update.
+	BugNotifUpstream BugNotif = iota
+	// Bug needs to be closed as obsoleted.
+	// If the action succeeds, reporting sends BugStatusInvalid update.
+	BugNotifObsoleted
+	// Bug fixing commit can't be discovered (wrong commit title).
+	BugNotifBadCommit
+)
+
+const (
 	ReproLevelNone ReproLevel = iota
 	ReproLevelSyz
 	ReproLevelC