X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/c52c3788fbbf161db40118261c4cfff52ebf8ceb..443a0b96316ed46600dc5035193adae6ac4d1f74:/services/ws/session_v0.go

diff --git a/services/ws/session_v0.go b/services/ws/session_v0.go
index 2bcce6073e..7bd1498158 100644
--- a/services/ws/session_v0.go
+++ b/services/ws/session_v0.go
@@ -1,28 +1,43 @@
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
 package main
 
 import (
 	"database/sql"
 	"encoding/json"
 	"errors"
+	"reflect"
 	"sync"
 	"sync/atomic"
 	"time"
 
 	"git.curoverse.com/arvados.git/sdk/go/arvados"
-	"github.com/Sirupsen/logrus"
+	"github.com/sirupsen/logrus"
 )
 
 var (
 	errQueueFull   = errors.New("client queue full")
 	errFrameTooBig = errors.New("frame too big")
 
-	sendObjectAttributes = []string{"state", "name"}
+	// Send clients only these keys from the
+	// log.properties.old_attributes and
+	// log.properties.new_attributes hashes.
+	sendObjectAttributes = []string{
+		"is_trashed",
+		"name",
+		"owner_uuid",
+		"portable_data_hash",
+		"state",
+	}
 
 	v0subscribeOK   = []byte(`{"status":200}`)
 	v0subscribeFail = []byte(`{"status":400}`)
 )
 
 type v0session struct {
+	ac            *arvados.Client
 	ws            wsConn
 	sendq         chan<- interface{}
 	db            *sql.DB
@@ -34,12 +49,16 @@ type v0session struct {
 	setupOnce     sync.Once
 }
 
-func NewSessionV0(ws wsConn, sendq chan<- interface{}, ac arvados.Client, db *sql.DB) (session, error) {
+// newSessionV0 returns a v0 session: a partial port of the Rails/puma
+// implementation, with just enough functionality to support Workbench
+// and arv-mount.
+func newSessionV0(ws wsConn, sendq chan<- interface{}, db *sql.DB, pc permChecker, ac *arvados.Client) (session, error) {
 	sess := &v0session{
 		sendq:       sendq,
 		ws:          ws,
 		db:          db,
-		permChecker: NewPermChecker(ac),
+		ac:          ac,
+		permChecker: pc,
 		log:         logger(ws.Request().Context()),
 	}
 
@@ -68,6 +87,24 @@ func (sess *v0session) Receive(buf []byte) error {
 		sess.mtx.Unlock()
 		sub.sendOldEvents(sess)
 		return nil
+	} else if sub.Method == "unsubscribe" {
+		sess.mtx.Lock()
+		found := false
+		for i, s := range sess.subscriptions {
+			if !reflect.DeepEqual(s.Filters, sub.Filters) {
+				continue
+			}
+			copy(sess.subscriptions[i:], sess.subscriptions[i+1:])
+			sess.subscriptions = sess.subscriptions[:len(sess.subscriptions)-1]
+			found = true
+			break
+		}
+		sess.mtx.Unlock()
+		sess.log.WithField("sub", sub).WithField("found", found).Debug("unsubscribe")
+		if found {
+			sess.sendq <- v0subscribeOK
+			return nil
+		}
 	} else {
 		sess.log.WithField("Method", sub.Method).Info("unknown method")
 	}
@@ -81,18 +118,31 @@ func (sess *v0session) EventMessage(e *event) ([]byte, error) {
 		return nil, nil
 	}
 
-	ok, err := sess.permChecker.Check(detail.ObjectUUID)
+	var permTarget string
+	if detail.EventType == "delete" {
+		// It's pointless to check permission by reading
+		// ObjectUUID if it has just been deleted, but if the
+		// client has permission on the parent project then
+		// it's OK to send the event.
+		permTarget = detail.ObjectOwnerUUID
+	} else {
+		permTarget = detail.ObjectUUID
+	}
+	ok, err := sess.permChecker.Check(permTarget)
 	if err != nil || !ok {
 		return nil, err
 	}
 
+	kind, _ := sess.ac.KindForUUID(detail.ObjectUUID)
 	msg := map[string]interface{}{
 		"msgID":             atomic.AddUint64(&sess.lastMsgID, 1),
 		"id":                detail.ID,
 		"uuid":              detail.UUID,
 		"object_uuid":       detail.ObjectUUID,
 		"object_owner_uuid": detail.ObjectOwnerUUID,
+		"object_kind":       kind,
 		"event_type":        detail.EventType,
+		"event_at":          detail.EventAt,
 	}
 	if detail.Properties != nil && detail.Properties["text"] != nil {
 		msg["properties"] = detail.Properties
@@ -131,7 +181,7 @@ func (sub *v0subscribe) sendOldEvents(sess *v0session) {
 	if sub.LastLogID == 0 {
 		return
 	}
-	sess.log.WithField("LastLogID", sub.LastLogID).Debug("getOldEvents")
+	sess.log.WithField("LastLogID", sub.LastLogID).Debug("sendOldEvents")
 	// Here we do a "select id" query and queue an event for every
 	// log since the given ID, then use (*event)Detail() to
 	// retrieve the whole row and decide whether to send it. This
@@ -146,16 +196,26 @@ func (sub *v0subscribe) sendOldEvents(sess *v0session) {
 		sub.LastLogID,
 		time.Now().UTC().Add(-10*time.Minute).Format(time.RFC3339Nano))
 	if err != nil {
-		sess.log.WithError(err).Error("db.Query failed")
+		sess.log.WithError(err).Error("sendOldEvents db.Query failed")
 		return
 	}
+
+	var ids []uint64
 	for rows.Next() {
 		var id uint64
 		err := rows.Scan(&id)
 		if err != nil {
-			sess.log.WithError(err).Error("row Scan failed")
+			sess.log.WithError(err).Error("sendOldEvents row Scan failed")
 			continue
 		}
+		ids = append(ids, id)
+	}
+	if err := rows.Err(); err != nil {
+		sess.log.WithError(err).Error("sendOldEvents db.Query failed")
+	}
+	rows.Close()
+
+	for _, id := range ids {
 		for len(sess.sendq)*2 > cap(sess.sendq) {
 			// Ugly... but if we fill up the whole client
 			// queue with a backlog of old events, a
@@ -164,19 +224,26 @@ func (sub *v0subscribe) sendOldEvents(sess *v0session) {
 			// client will probably reconnect and do the
 			// same thing all over again.
 			time.Sleep(100 * time.Millisecond)
+			if sess.ws.Request().Context().Err() != nil {
+				// Session terminated while we were sleeping
+				return
+			}
 		}
+		now := time.Now()
 		e := &event{
 			LogID:    id,
-			Received: time.Now(),
+			Received: now,
+			Ready:    now,
 			db:       sess.db,
 		}
 		if sub.match(sess, e) {
-			sess.sendq <- e
+			select {
+			case sess.sendq <- e:
+			case <-sess.ws.Request().Context().Done():
+				return
+			}
 		}
 	}
-	if err := rows.Err(); err != nil {
-		sess.log.WithError(err).Error("db.Query failed")
-	}
 }
 
 type v0subscribe struct {