Rig up dowork event queue and graceful termination

4 files changed, 120 insertions, 6 deletions

diff --git a/cmd/alps/main.go b/cmd/alps/main.go
index 4c358d5..dedd6cb 100644
--- a/cmd/alps/main.go
+++ b/cmd/alps/main.go
@@ -1,11 +1,13 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"fmt"
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"git.sr.ht/~emersion/alps"
 	"github.com/fernet/fernet-go"
@@ -74,15 +76,29 @@ func main() {
 		e.Logger.SetLevel(log.DEBUG)
 	}
 
+	go e.Start(addr)
+
+	s.Queue.Start(context.Background())
+
 	sigs := make(chan os.Signal, 1)
-	signal.Notify(sigs, syscall.SIGUSR1)
-	go func() {
-		for range sigs {
+	signal.Notify(sigs, syscall.SIGUSR1, syscall.SIGINT)
+
+	for sig := range sigs {
+		if sig == syscall.SIGUSR1 {
 			if err := s.Reload(); err != nil {
 				e.Logger.Errorf("Failed to reload server: %v", err)
 			}
+		} else if sig == syscall.SIGINT {
+			break
 		}
-	}()
+	}
+
+	ctx, cancel := context.WithDeadline(context.Background(),
+		time.Now().Add(30*time.Second))
+	e.Shutdown(ctx)
+	cancel()
 
-	e.Logger.Fatal(e.Start(addr))
+	e.Logger.Print("Waiting for work queues to finish...")
+	s.Queue.Shutdown()
+	e.Logger.Print("Shut down.")
 }
diff --git a/go.mod b/go.mod
index e0f022b..ea2b169 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module git.sr.ht/~emersion/alps
 go 1.13
 
 require (
+	git.sr.ht/~sircmpwn/dowork v0.0.0-20201013174036-53a05612a082
 	github.com/aymerick/douceur v0.2.0
 	github.com/chris-ramon/douceur v0.2.0
 	github.com/emersion/go-ical v0.0.0-20200225233454-26ef720b8bf1
@@ -25,6 +26,5 @@ require (
 	gitlab.com/golang-commonmark/linkify v0.0.0-20200225224916-64bca66f6ad3
 	golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37 // indirect
 	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f
-	golang.org/x/sys v0.0.0-20200513112337-417ce2331b5c // indirect
 	layeh.com/gopher-luar v1.0.7
 )
diff --git a/go.sum b/go.sum
index a0b4496..3d180d4 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,17 @@
+git.sr.ht/~sircmpwn/dowork v0.0.0-20201013174036-53a05612a082 h1:lMwtTJQPhEgGnZTHO8TMzSUk6YbyqD/xioSQme3NEQQ=
+git.sr.ht/~sircmpwn/dowork v0.0.0-20201013174036-53a05612a082/go.mod h1:8neHEO3503w/rNtttnR0JFpQgM/GFhaafVwvkPsFIDw=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chris-ramon/douceur v0.2.0 h1:IDMEdxlEUUBYBKE4z/mJnFyVXox+MjuEVDJNN27glkU=
 github.com/chris-ramon/douceur v0.2.0/go.mod h1:wDW5xjJdeoMm1mRt4sD4c/LbF/mWdEpRXQKjTR8nIBE=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
@@ -44,10 +56,38 @@ github.com/emersion/go-webdav v0.3.1-0.20200513144525-a4e0e8100397 h1:XVnGMemAyw
 github.com/emersion/go-webdav v0.3.1-0.20200513144525-a4e0e8100397/go.mod h1:uSM1VveeKtogBVWaYccTksToczooJ0rrVGNsgnDsr4Q=
 github.com/fernet/fernet-go v0.0.0-20191111064656-eff2850e6001 h1:/UMxx5lGDg30aioUL9e7xJnbJfJeX7vhcm57fa5udaI=
 github.com/fernet/fernet-go v0.0.0-20191111064656-eff2850e6001/go.mod h1:2H9hjfbpSMHwY503FclkV/lZTBh2YlOmLLSda12uL8c=
+github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
+github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
+github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
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+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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@@ -61,14 +101,43 @@ github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hd
 github.com/mattn/go-isatty v0.0.9/go.mod h1:YNRxwqDuOph6SZLI9vUUz6OYw3QyUt7WiY2yME+cCiQ=
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+github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
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 github.com/microcosm-cc/bluemonday v1.0.2/go.mod h1:iVP4YcDBq+n/5fb23BhYFvIMq/leAFZyRl6bYmGDlGc=
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@@ -79,34 +148,60 @@ github.com/yuin/gopher-lua v0.0.0-20191220021717-ab39c6098bdb h1:ZkM6LRnq40pR1Ox
 github.com/yuin/gopher-lua v0.0.0-20191220021717-ab39c6098bdb/go.mod h1:gqRgreBUhTSL0GeU64rtZ3Uq3wtjOa/TB2YfrtkCbVQ=
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 gitlab.com/golang-commonmark/linkify v0.0.0-20200225224916-64bca66f6ad3/go.mod h1:Gn+LZmCrhPECMD3SOKlE+BOHwhOYD9j7WT9NUtkCrC8=
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 golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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diff --git a/server.go b/server.go
index 7d7a431..dc2708e 100644
--- a/server.go
+++ b/server.go
@@ -10,6 +10,7 @@ import (
 	"sync"
 	"time"
 
+	"git.sr.ht/~sircmpwn/dowork"
 	"github.com/fernet/fernet-go"
 	"github.com/labstack/echo/v4"
 )
@@ -24,6 +25,7 @@ type Server struct {
 	e        *echo.Echo
 	Sessions *SessionManager
 	Options  *Options
+	Queue    *work.Queue
 
 	mutex   sync.RWMutex // used for server reload
 	plugins []Plugin
@@ -66,6 +68,7 @@ func newServer(e *echo.Echo, options *Options) (*Server, error) {
 	}
 
 	s.Sessions = newSessionManager(s.dialIMAP, s.dialSMTP, e.Logger, options.Debug)
+	s.Queue = work.NewQueue("alps")
 
 	return s, nil
 }