11 "github.com/Sirupsen/logrus"
15 errQueueFull = errors.New("client queue full")
16 errFrameTooBig = errors.New("frame too big")
18 sendObjectAttributes = []string{"state", "name"}
20 v0subscribeOK = []byte(`{"status":200}`)
21 v0subscribeFail = []byte(`{"status":400}`)
24 type v0session struct {
26 sendq chan<- interface{}
28 permChecker permChecker
29 subscriptions []v0subscribe
36 func NewSessionV0(ws wsConn, sendq chan<- interface{}, db *sql.DB, pc permChecker) (session, error) {
42 log: logger(ws.Request().Context()),
45 err := ws.Request().ParseForm()
47 sess.log.WithError(err).Error("ParseForm failed")
50 token := ws.Request().Form.Get("api_token")
51 sess.permChecker.SetToken(token)
52 sess.log.WithField("token", token).Debug("set token")
57 func (sess *v0session) Receive(buf []byte) error {
59 if err := json.Unmarshal(buf, &sub); err != nil {
60 sess.log.WithError(err).Info("invalid message from client")
61 } else if sub.Method == "subscribe" {
63 sess.log.WithField("sub", sub).Debug("sub prepared")
64 sess.sendq <- v0subscribeOK
66 sess.subscriptions = append(sess.subscriptions, sub)
68 sub.sendOldEvents(sess)
71 sess.log.WithField("Method", sub.Method).Info("unknown method")
73 sess.sendq <- v0subscribeFail
77 func (sess *v0session) EventMessage(e *event) ([]byte, error) {
83 ok, err := sess.permChecker.Check(detail.ObjectUUID)
84 if err != nil || !ok {
88 msg := map[string]interface{}{
89 "msgID": atomic.AddUint64(&sess.lastMsgID, 1),
92 "object_uuid": detail.ObjectUUID,
93 "object_owner_uuid": detail.ObjectOwnerUUID,
94 "event_type": detail.EventType,
96 if detail.Properties != nil && detail.Properties["text"] != nil {
97 msg["properties"] = detail.Properties
99 msgProps := map[string]map[string]interface{}{}
100 for _, ak := range []string{"old_attributes", "new_attributes"} {
101 eventAttrs, ok := detail.Properties[ak].(map[string]interface{})
105 msgAttrs := map[string]interface{}{}
106 for _, k := range sendObjectAttributes {
107 if v, ok := eventAttrs[k]; ok {
111 msgProps[ak] = msgAttrs
113 msg["properties"] = msgProps
115 return json.Marshal(msg)
118 func (sess *v0session) Filter(e *event) bool {
120 defer sess.mtx.Unlock()
121 for _, sub := range sess.subscriptions {
122 if sub.match(sess, e) {
129 func (sub *v0subscribe) sendOldEvents(sess *v0session) {
130 if sub.LastLogID == 0 {
133 sess.log.WithField("LastLogID", sub.LastLogID).Debug("getOldEvents")
134 // Here we do a "select id" query and queue an event for every
135 // log since the given ID, then use (*event)Detail() to
136 // retrieve the whole row and decide whether to send it. This
137 // approach is very inefficient if the subscriber asks for
138 // last_log_id==1, even if the filters end up matching very
141 // To mitigate this, filter on "created > 10 minutes ago" when
142 // retrieving the list of old event IDs to consider.
143 rows, err := sess.db.Query(
144 `SELECT id FROM logs WHERE id > $1 AND created_at > $2 ORDER BY id`,
146 time.Now().UTC().Add(-10*time.Minute).Format(time.RFC3339Nano))
148 sess.log.WithError(err).Error("db.Query failed")
153 err := rows.Scan(&id)
155 sess.log.WithError(err).Error("row Scan failed")
158 for len(sess.sendq)*2 > cap(sess.sendq) {
159 // Ugly... but if we fill up the whole client
160 // queue with a backlog of old events, a
161 // single new event will overflow it and
162 // terminate the connection, and then the
163 // client will probably reconnect and do the
164 // same thing all over again.
165 time.Sleep(100 * time.Millisecond)
174 if sub.match(sess, e) {
176 case sess.sendq <- e:
177 case <-sess.ws.Request().Context().Done():
182 if err := rows.Err(); err != nil {
183 sess.log.WithError(err).Error("db.Query failed")
187 type v0subscribe struct {
190 LastLogID int64 `json:"last_log_id"`
192 funcs []func(*event) bool
195 type v0filter [3]interface{}
197 func (sub *v0subscribe) match(sess *v0session, e *event) bool {
198 log := sess.log.WithField("LogID", e.LogID)
201 log.Error("match failed, no detail")
204 log = log.WithField("funcs", len(sub.funcs))
205 for i, f := range sub.funcs {
207 log.WithField("func", i).Debug("match failed")
211 log.Debug("match passed")
215 func (sub *v0subscribe) prepare(sess *v0session) {
216 for _, f := range sub.Filters {
220 if col, ok := f[0].(string); ok && col == "event_type" {
221 op, ok := f[1].(string)
222 if !ok || op != "in" {
225 arr, ok := f[2].([]interface{})
230 for _, s := range arr {
231 if s, ok := s.(string); ok {
232 strs = append(strs, s)
235 sub.funcs = append(sub.funcs, func(e *event) bool {
236 for _, s := range strs {
237 if s == e.Detail().EventType {
243 } else if ok && col == "created_at" {
244 op, ok := f[1].(string)
248 tstr, ok := f[2].(string)
252 t, err := time.Parse(time.RFC3339Nano, tstr)
254 sess.log.WithField("data", tstr).WithError(err).Info("time.Parse failed")
257 var fn func(*event) bool
260 fn = func(e *event) bool {
261 return !e.Detail().CreatedAt.Before(t)
264 fn = func(e *event) bool {
265 return !e.Detail().CreatedAt.After(t)
268 fn = func(e *event) bool {
269 return e.Detail().CreatedAt.After(t)
272 fn = func(e *event) bool {
273 return e.Detail().CreatedAt.Before(t)
276 fn = func(e *event) bool {
277 return e.Detail().CreatedAt.Equal(t)
280 sess.log.WithField("operator", op).Info("bogus operator")
283 sub.funcs = append(sub.funcs, fn)