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WIP_ Add 'At:'/'Delay:' headers to support scheduled messages

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This commit is contained in:
Philipp Heckel 2021-12-10 11:31:42 -05:00
parent aacdda94e1
commit 196c86d12b
8 changed files with 311 additions and 112 deletions
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3
config/config.go
View file

@ -11,6 +11,7 @@ const (
DefaultCacheDuration = 12 * time.Hour
DefaultKeepaliveInterval = 30 * time.Second
DefaultManagerInterval = time.Minute
DefaultAtSenderInterval = 10 * time.Second
)
// Defines all the limits
@ -35,6 +36,7 @@ type Config struct {
CacheDuration time.Duration
KeepaliveInterval time.Duration
ManagerInterval time.Duration
AtSenderInterval time.Duration
GlobalTopicLimit int
VisitorRequestLimitBurst int
VisitorRequestLimitReplenish time.Duration
@ -54,6 +56,7 @@ func New(listenHTTP string) *Config {
CacheDuration: DefaultCacheDuration,
KeepaliveInterval: DefaultKeepaliveInterval,
ManagerInterval: DefaultManagerInterval,
AtSenderInterval: DefaultAtSenderInterval,
GlobalTopicLimit: DefaultGlobalTopicLimit,
VisitorRequestLimitBurst: DefaultVisitorRequestLimitBurst,
VisitorRequestLimitReplenish: DefaultVisitorRequestLimitReplenish,

4
server/cache.go
View file

@ -14,8 +14,10 @@ var (
// i.e. message structs with the Event messageEvent.
type cache interface {
AddMessage(m *message) error
Messages(topic string, since sinceTime) ([]*message, error)
Messages(topic string, since sinceTime, scheduled bool) ([]*message, error)
MessagesDue() ([]*message, error)
MessageCount(topic string) (int, error)
Topics() (map[string]*topic, error)
Prune(olderThan time.Time) error
MarkPublished(m *message) error
}

101
server/cache_mem.go
View file

@ -1,12 +1,14 @@
package server
import (
"sort"
"sync"
"time"
)
type memCache struct {
messages map[string][]*message
scheduled map[string]*message // Message ID -> message
nop bool
mu sync.Mutex
}
@ -17,6 +19,7 @@ var _ cache = (*memCache)(nil)
func newMemCache() *memCache {
return &memCache{
messages: make(map[string][]*message),
scheduled: make(map[string]*message),
nop: false,
}
}
@ -26,76 +29,108 @@ func newMemCache() *memCache {
func newNopCache() *memCache {
return &memCache{
messages: make(map[string][]*message),
scheduled: make(map[string]*message),
nop: true,
}
}
func (s *memCache) AddMessage(m *message) error {
s.mu.Lock()
defer s.mu.Unlock()
if s.nop {
func (c *memCache) AddMessage(m *message) error {
c.mu.Lock()
defer c.mu.Unlock()
if c.nop {
return nil
}
if m.Event != messageEvent {
return errUnexpectedMessageType
}
if _, ok := s.messages[m.Topic]; !ok {
s.messages[m.Topic] = make([]*message, 0)
if _, ok := c.messages[m.Topic]; !ok {
c.messages[m.Topic] = make([]*message, 0)
}
s.messages[m.Topic] = append(s.messages[m.Topic], m)
delayed := m.Time > time.Now().Unix()
if delayed {
c.scheduled[m.ID] = m
}
c.messages[m.Topic] = append(c.messages[m.Topic], m)
return nil
}
func (s *memCache) Messages(topic string, since sinceTime) ([]*message, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.messages[topic]; !ok || since.IsNone() {
func (c *memCache) Messages(topic string, since sinceTime, scheduled bool) ([]*message, error) {
c.mu.Lock()
defer c.mu.Unlock()
if _, ok := c.messages[topic]; !ok || since.IsNone() {
return make([]*message, 0), nil
}
messages := make([]*message, 0) // copy!
for _, m := range s.messages[topic] {
msgTime := time.Unix(m.Time, 0)
if msgTime == since.Time() || msgTime.After(since.Time()) {
messages := make([]*message, 0)
for _, m := range c.messages[topic] {
_, messageScheduled := c.scheduled[m.ID]
include := m.Time >= since.Time().Unix() && (!messageScheduled || scheduled)
if include {
messages = append(messages, m)
}
}
sort.Slice(messages, func(i, j int) bool {
return messages[i].Time < messages[j].Time
})
return messages, nil
}
func (s *memCache) MessageCount(topic string) (int, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.messages[topic]; !ok {
return 0, nil
func (c *memCache) MessagesDue() ([]*message, error) {
c.mu.Lock()
defer c.mu.Unlock()
messages := make([]*message, 0)
for _, m := range c.scheduled {
due := time.Now().Unix() >= m.Time
if due {
messages = append(messages, m)
}
return len(s.messages[topic]), nil
}
sort.Slice(messages, func(i, j int) bool {
return messages[i].Time < messages[j].Time
})
return messages, nil
}
func (s *memCache) Topics() (map[string]*topic, error) {
s.mu.Lock()
defer s.mu.Unlock()
func (c *memCache) MarkPublished(m *message) error {
c.mu.Lock()
delete(c.scheduled, m.ID)
c.mu.Unlock()
return nil
}
func (c *memCache) MessageCount(topic string) (int, error) {
c.mu.Lock()
defer c.mu.Unlock()
if _, ok := c.messages[topic]; !ok {
return 0, nil
}
return len(c.messages[topic]), nil
}
func (c *memCache) Topics() (map[string]*topic, error) {
c.mu.Lock()
defer c.mu.Unlock()
topics := make(map[string]*topic)
for topic := range s.messages {
for topic := range c.messages {
topics[topic] = newTopic(topic)
}
return topics, nil
}
func (s *memCache) Prune(olderThan time.Time) error {
s.mu.Lock()
defer s.mu.Unlock()
for topic := range s.messages {
s.pruneTopic(topic, olderThan)
func (c *memCache) Prune(olderThan time.Time) error {
c.mu.Lock()
defer c.mu.Unlock()
for topic := range c.messages {
c.pruneTopic(topic, olderThan)
}
return nil
}
func (s *memCache) pruneTopic(topic string, olderThan time.Time) {
func (c *memCache) pruneTopic(topic string, olderThan time.Time) {
messages := make([]*message, 0)
for _, m := range s.messages[topic] {
for _, m := range c.messages[topic] {
if m.Time >= olderThan.Unix() {
messages = append(messages, m)
}
}
s.messages[topic] = messages
c.messages[topic] = messages
}

6
server/cache_mem_test.go
View file

@ -9,6 +9,10 @@ func TestMemCache_Messages(t *testing.T) {
testCacheMessages(t, newMemCache())
}
func TestMemCache_MessagesScheduled(t *testing.T) {
testCacheMessagesScheduled(t, newMemCache())
}
func TestMemCache_Topics(t *testing.T) {
testCacheTopics(t, newMemCache())
}
@ -25,7 +29,7 @@ func TestMemCache_NopCache(t *testing.T) {
c := newNopCache()
assert.Nil(t, c.AddMessage(newDefaultMessage("mytopic", "my message")))
messages, err := c.Messages("mytopic", sinceAllMessages)
messages, err := c.Messages("mytopic", sinceAllMessages, false)
assert.Nil(t, err)
assert.Empty(t, messages)

130
server/cache_sqlite.go
View file

@ -21,19 +21,32 @@ const (
message VARCHAR(512) NOT NULL,
title VARCHAR(256) NOT NULL,
priority INT NOT NULL,
tags VARCHAR(256) NOT NULL
tags VARCHAR(256) NOT NULL,
published INT NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_topic ON messages (topic);
COMMIT;
`
insertMessageQuery = `INSERT INTO messages (id, time, topic, message, title, priority, tags) VALUES (?, ?, ?, ?, ?, ?, ?)`
insertMessageQuery = `INSERT INTO messages (id, time, topic, message, title, priority, tags, published) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`
pruneMessagesQuery = `DELETE FROM messages WHERE time < ?`
selectMessagesSinceTimeQuery = `
SELECT id, time, message, title, priority, tags
SELECT id, time, topic, message, title, priority, tags
FROM messages
WHERE topic = ? AND time >= ? AND published = 1
ORDER BY time ASC
`
selectMessagesSinceTimeIncludeScheduledQuery = `
SELECT id, time, topic, message, title, priority, tags
FROM messages
WHERE topic = ? AND time >= ?
ORDER BY time ASC
`
selectMessagesDueQuery = `
SELECT id, time, topic, message, title, priority, tags
FROM messages
WHERE time <= ? AND published = 0
`
updateMessagePublishedQuery = `UPDATE messages SET published = 1 WHERE id = ?`
selectMessagesCountQuery = `SELECT COUNT(*) FROM messages`
selectMessageCountForTopicQuery = `SELECT COUNT(*) FROM messages WHERE topic = ?`
selectTopicsQuery = `SELECT topic FROM messages GROUP BY topic`
@ -41,7 +54,7 @@ const (
// Schema management queries
const (
currentSchemaVersion = 1
currentSchemaVersion = 2
createSchemaVersionTableQuery = `
CREATE TABLE IF NOT EXISTS schemaVersion (
id INT PRIMARY KEY,
@ -49,6 +62,7 @@ const (
);
`
insertSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)`
updateSchemaVersion = `UPDATE schemaVersion SET version = ? WHERE id = 1`
selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
// 0 -> 1
@ -59,6 +73,13 @@ const (
ALTER TABLE messages ADD COLUMN tags VARCHAR(256) NOT NULL DEFAULT('');
COMMIT;
`
// 1 -> 2
migrate1To2AlterMessagesTableQuery = `
BEGIN;
ALTER TABLE messages ADD COLUMN published INT NOT NULL DEFAULT(1);
COMMIT;
`
)
type sqliteCache struct {
@ -84,46 +105,39 @@ func (c *sqliteCache) AddMessage(m *message) error {
if m.Event != messageEvent {
return errUnexpectedMessageType
}
_, err := c.db.Exec(insertMessageQuery, m.ID, m.Time, m.Topic, m.Message, m.Title, m.Priority, strings.Join(m.Tags, ","))
published := m.Time <= time.Now().Unix()
_, err := c.db.Exec(insertMessageQuery, m.ID, m.Time, m.Topic, m.Message, m.Title, m.Priority, strings.Join(m.Tags, ","), published)
return err
}
func (c *sqliteCache) Messages(topic string, since sinceTime) ([]*message, error) {
func (c *sqliteCache) Messages(topic string, since sinceTime, scheduled bool) ([]*message, error) {
if since.IsNone() {
return make([]*message, 0), nil
}
rows, err := c.db.Query(selectMessagesSinceTimeQuery, topic, since.Time().Unix())
var rows *sql.Rows
var err error
if scheduled {
rows, err = c.db.Query(selectMessagesSinceTimeIncludeScheduledQuery, topic, since.Time().Unix())
} else {
rows, err = c.db.Query(selectMessagesSinceTimeQuery, topic, since.Time().Unix())
}
if err != nil {
return nil, err
}
defer rows.Close()
messages := make([]*message, 0)
for rows.Next() {
var timestamp int64
var priority int
var id, msg, title, tagsStr string
if err := rows.Scan(&id, &timestamp, &msg, &title, &priority, &tagsStr); err != nil {
return readMessages(rows)
}
func (c *sqliteCache) MessagesDue() ([]*message, error) {
rows, err := c.db.Query(selectMessagesDueQuery, time.Now().Unix())
if err != nil {
return nil, err
}
var tags []string
if tagsStr != "" {
tags = strings.Split(tagsStr, ",")
}
messages = append(messages, &message{
ID: id,
Time: timestamp,
Event: messageEvent,
Topic: topic,
Message: msg,
Title: title,
Priority: priority,
Tags: tags,
})
}
if err := rows.Err(); err != nil {
return nil, err
}
return messages, nil
return readMessages(rows)
}
func (c *sqliteCache) MarkPublished(m *message) error {
_, err := c.db.Exec(updateMessagePublishedQuery, m.ID)
return err
}
func (c *sqliteCache) MessageCount(topic string) (int, error) {
@ -169,6 +183,37 @@ func (c *sqliteCache) Prune(olderThan time.Time) error {
return err
}
func readMessages(rows *sql.Rows) ([]*message, error) {
defer rows.Close()
messages := make([]*message, 0)
for rows.Next() {
var timestamp int64
var priority int
var id, topic, msg, title, tagsStr string
if err := rows.Scan(&id, &timestamp, &topic, &msg, &title, &priority, &tagsStr); err != nil {
return nil, err
}
var tags []string
if tagsStr != "" {
tags = strings.Split(tagsStr, ",")
}
messages = append(messages, &message{
ID: id,
Time: timestamp,
Event: messageEvent,
Topic: topic,
Message: msg,
Title: title,
Priority: priority,
Tags: tags,
})
}
if err := rows.Err(); err != nil {
return nil, err
}
return messages, nil
}
func setupDB(db *sql.DB) error {
// If 'messages' table does not exist, this must be a new database
rowsMC, err := db.Query(selectMessagesCountQuery)
@ -194,7 +239,9 @@ func setupDB(db *sql.DB) error {
if schemaVersion == currentSchemaVersion {
return nil
} else if schemaVersion == 0 {
return migrateFrom0To1(db)
return migrateFrom0(db)
} else if schemaVersion == 1 {
return migrateFrom1(db)
}
return fmt.Errorf("unexpected schema version found: %d", schemaVersion)
}
@ -212,7 +259,7 @@ func setupNewDB(db *sql.DB) error {
return nil
}
func migrateFrom0To1(db *sql.DB) error {
func migrateFrom0(db *sql.DB) error {
log.Print("Migrating cache database schema: from 0 to 1")
if _, err := db.Exec(migrate0To1AlterMessagesTableQuery); err != nil {
return err
@ -223,5 +270,16 @@ func migrateFrom0To1(db *sql.DB) error {
if _, err := db.Exec(insertSchemaVersion, 1); err != nil {
return err
}
return nil
return migrateFrom1(db)
}
func migrateFrom1(db *sql.DB) error {
log.Print("Migrating cache database schema: from 1 to 2")
if _, err := db.Exec(migrate1To2AlterMessagesTableQuery); err != nil {
return err
}
if _, err := db.Exec(updateSchemaVersion, 2); err != nil {
return err
}
return nil // Update this when a new version is added
}

12
server/cache_sqlite_test.go
View file

@ -9,10 +9,14 @@ import (
"time"
)
func TestSqliteCache_AddMessage(t *testing.T) {
func TestSqliteCache_Messages(t *testing.T) {
testCacheMessages(t, newSqliteTestCache(t))
}
func TestSqliteCache_MessagesScheduled(t *testing.T) {
testCacheMessagesScheduled(t, newSqliteTestCache(t))
}
func TestSqliteCache_Topics(t *testing.T) {
testCacheTopics(t, newSqliteTestCache(t))
}
@ -25,7 +29,7 @@ func TestSqliteCache_Prune(t *testing.T) {
testCachePrune(t, newSqliteTestCache(t))
}
func TestSqliteCache_Migration_0to1(t *testing.T) {
func TestSqliteCache_Migration_From0(t *testing.T) {
filename := newSqliteTestCacheFile(t)
db, err := sql.Open("sqlite3", filename)
assert.Nil(t, err)
@ -53,7 +57,7 @@ func TestSqliteCache_Migration_0to1(t *testing.T) {
// Create cache to trigger migration
c := newSqliteTestCacheFromFile(t, filename)
messages, err := c.Messages("mytopic", sinceAllMessages)
messages, err := c.Messages("mytopic", sinceAllMessages, false)
assert.Nil(t, err)
assert.Equal(t, 10, len(messages))
assert.Equal(t, "some message 5", messages[5].Message)
@ -67,7 +71,7 @@ func TestSqliteCache_Migration_0to1(t *testing.T) {
var schemaVersion int
assert.Nil(t, rows.Scan(&schemaVersion))
assert.Equal(t, 1, schemaVersion)
assert.Equal(t, 2, schemaVersion)
}
func newSqliteTestCache(t *testing.T) *sqliteCache {

40
server/cache_test.go
View file

@ -27,7 +27,7 @@ func testCacheMessages(t *testing.T, c cache) {
assert.Equal(t, 2, count)
// mytopic: since all
messages, _ := c.Messages("mytopic", sinceAllMessages)
messages, _ := c.Messages("mytopic", sinceAllMessages, false)
assert.Equal(t, 2, len(messages))
assert.Equal(t, "my message", messages[0].Message)
assert.Equal(t, "mytopic", messages[0].Topic)
@ -38,11 +38,11 @@ func testCacheMessages(t *testing.T, c cache) {
assert.Equal(t, "my other message", messages[1].Message)
// mytopic: since none
messages, _ = c.Messages("mytopic", sinceNoMessages)
messages, _ = c.Messages("mytopic", sinceNoMessages, false)
assert.Empty(t, messages)
// mytopic: since 2
messages, _ = c.Messages("mytopic", sinceTime(time.Unix(2, 0)))
messages, _ = c.Messages("mytopic", sinceTime(time.Unix(2, 0)), false)
assert.Equal(t, 1, len(messages))
assert.Equal(t, "my other message", messages[0].Message)
@ -52,7 +52,7 @@ func testCacheMessages(t *testing.T, c cache) {
assert.Equal(t, 1, count)
// example: since all
messages, _ = c.Messages("example", sinceAllMessages)
messages, _ = c.Messages("example", sinceAllMessages, false)
assert.Equal(t, "my example message", messages[0].Message)
// non-existing: count
@ -61,7 +61,7 @@ func testCacheMessages(t *testing.T, c cache) {
assert.Equal(t, 0, count)
// non-existing: since all
messages, _ = c.Messages("doesnotexist", sinceAllMessages)
messages, _ = c.Messages("doesnotexist", sinceAllMessages, false)
assert.Empty(t, messages)
}
@ -103,7 +103,7 @@ func testCachePrune(t *testing.T, c cache) {
assert.Nil(t, err)
assert.Equal(t, 0, count)
messages, err := c.Messages("mytopic", sinceAllMessages)
messages, err := c.Messages("mytopic", sinceAllMessages, false)
assert.Nil(t, err)
assert.Equal(t, 1, len(messages))
assert.Equal(t, "my other message", messages[0].Message)
@ -116,8 +116,34 @@ func testCacheMessagesTagsPrioAndTitle(t *testing.T, c cache) {
m.Title = "some title"
assert.Nil(t, c.AddMessage(m))
messages, _ := c.Messages("mytopic", sinceAllMessages)
messages, _ := c.Messages("mytopic", sinceAllMessages, false)
assert.Equal(t, []string{"tag1", "tag2"}, messages[0].Tags)
assert.Equal(t, 5, messages[0].Priority)
assert.Equal(t, "some title", messages[0].Title)
}
func testCacheMessagesScheduled(t *testing.T, c cache) {
m1 := newDefaultMessage("mytopic", "message 1")
m2 := newDefaultMessage("mytopic", "message 2")
m2.Time = time.Now().Add(time.Hour).Unix()
m3 := newDefaultMessage("mytopic", "message 3")
m3.Time = time.Now().Add(time.Minute).Unix() // earlier than m2!
m4 := newDefaultMessage("mytopic2", "message 4")
m4.Time = time.Now().Add(time.Minute).Unix()
assert.Nil(t, c.AddMessage(m1))
assert.Nil(t, c.AddMessage(m2))
assert.Nil(t, c.AddMessage(m3))
messages, _ := c.Messages("mytopic", sinceAllMessages, false) // exclude scheduled
assert.Equal(t, 1, len(messages))
assert.Equal(t, "message 1", messages[0].Message)
messages, _ = c.Messages("mytopic", sinceAllMessages, true) // include scheduled
assert.Equal(t, 3, len(messages))
assert.Equal(t, "message 1", messages[0].Message)
assert.Equal(t, "message 3", messages[1].Message) // Order!
assert.Equal(t, "message 2", messages[2].Message)
messages, _ = c.MessagesDue()
assert.Empty(t, messages)
}

111
server/server.go
View file

@ -73,6 +73,7 @@ var (
const (
messageLimit = 512
minDelay = 10 * time.Second
)
var (
@ -183,6 +184,15 @@ func (s *Server) Run() error {
s.updateStatsAndExpire()
}
}()
go func() {
ticker := time.NewTicker(s.config.AtSenderInterval)
for {
<-ticker.C
if err := s.sendDelayedMessages(); err != nil {
log.Printf("error sending scheduled messages: %s", err.Error())
}
}
}()
listenStr := fmt.Sprintf("%s/http", s.config.ListenHTTP)
if s.config.ListenHTTPS != "" {
listenStr += fmt.Sprintf(" %s/https", s.config.ListenHTTPS)
@ -279,14 +289,17 @@ func (s *Server) handlePublish(w http.ResponseWriter, r *http.Request, _ *visito
if m.Message == "" {
return errHTTPBadRequest
}
title, priority, tags, cache, firebase := parseHeaders(r.Header)
m.Title = title
m.Priority = priority
m.Tags = tags
cache, firebase, err := parseHeaders(r.Header, m)
if err != nil {
return err
}
delayed := m.Time > time.Now().Unix()
if !delayed {
if err := t.Publish(m); err != nil {
return err
}
if s.firebase != nil && firebase {
}
if s.firebase != nil && firebase && !delayed {
go func() {
if err := s.firebase(m); err != nil {
log.Printf("Unable to publish to Firebase: %v", err.Error())
@ -308,35 +321,62 @@ func (s *Server) handlePublish(w http.ResponseWriter, r *http.Request, _ *visito
return nil
}
func parseHeaders(header http.Header) (title string, priority int, tags []string, cache bool, firebase bool) {
title = readHeader(header, "x-title", "title", "ti", "t")
func parseHeaders(header http.Header, m *message) (cache bool, firebase bool, err error) {
cache = readHeader(header, "x-cache", "cache") != "no"
firebase = readHeader(header, "x-firebase", "firebase") != "no"
m.Title = readHeader(header, "x-title", "title", "ti", "t")
priorityStr := readHeader(header, "x-priority", "priority", "prio", "p")
if priorityStr != "" {
switch strings.ToLower(priorityStr) {
case "1", "min":
priority = 1
m.Priority = 1
case "2", "low":
priority = 2
m.Priority = 2
case "3", "default":
priority = 3
m.Priority = 3
case "4", "high":
priority = 4
m.Priority = 4
case "5", "max", "urgent":
priority = 5
m.Priority = 5
default:
priority = 0
return false, false, errHTTPBadRequest
}
}
tagsStr := readHeader(header, "x-tags", "tag", "tags", "ta")
if tagsStr != "" {
tags = make([]string, 0)
m.Tags = make([]string, 0)
for _, s := range strings.Split(tagsStr, ",") {
tags = append(tags, strings.TrimSpace(s))
m.Tags = append(m.Tags, strings.TrimSpace(s))
}
}
cache = readHeader(header, "x-cache", "cache") != "no"
firebase = readHeader(header, "x-firebase", "firebase") != "no"
return title, priority, tags, cache, firebase
atStr := readHeader(header, "x-at", "at", "x-schedule", "schedule", "sched")
if atStr != "" {
if !cache {
return false, false, errHTTPBadRequest
}
at, err := strconv.Atoi(atStr)
if err != nil {
return false, false, errHTTPBadRequest
} else if int64(at) < time.Now().Add(minDelay).Unix() {
return false, false, errHTTPBadRequest
}
m.Time = int64(at)
} else {
delayStr := readHeader(header, "x-delay", "delay", "x-in", "in")
if delayStr != "" {
if !cache {
return false, false, errHTTPBadRequest
}
delay, err := time.ParseDuration(delayStr)
if err != nil {
return false, false, errHTTPBadRequest
} else if delay < minDelay {
return false, false, errHTTPBadRequest
}
m.Time = time.Now().Add(delay).Unix()
}
}
return cache, firebase, nil
}
func readHeader(header http.Header, names ...string) string {
@ -401,6 +441,7 @@ func (s *Server) handleSubscribe(w http.ResponseWriter, r *http.Request, v *visi
}
var wlock sync.Mutex
poll := r.URL.Query().Has("poll")
scheduled := r.URL.Query().Has("scheduled") || r.URL.Query().Has("sched")
sub := func(msg *message) error {
wlock.Lock()
defer wlock.Unlock()
@ -419,7 +460,7 @@ func (s *Server) handleSubscribe(w http.ResponseWriter, r *http.Request, v *visi
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
w.Header().Set("Content-Type", contentType+"; charset=utf-8") // Android/Volley client needs charset!
if poll {
return s.sendOldMessages(topics, since, sub)
return s.sendOldMessages(topics, since, scheduled, sub)
}
subscriberIDs := make([]int, 0)
for _, t := range topics {
@ -433,7 +474,7 @@ func (s *Server) handleSubscribe(w http.ResponseWriter, r *http.Request, v *visi
if err := sub(newOpenMessage(topicsStr)); err != nil { // Send out open message
return err
}
if err := s.sendOldMessages(topics, since, sub); err != nil {
if err := s.sendOldMessages(topics, since, scheduled, sub); err != nil {
return err
}
for {
@ -449,12 +490,12 @@ func (s *Server) handleSubscribe(w http.ResponseWriter, r *http.Request, v *visi
}
}
func (s *Server) sendOldMessages(topics []*topic, since sinceTime, sub subscriber) error {
func (s *Server) sendOldMessages(topics []*topic, since sinceTime, scheduled bool, sub subscriber) error {
if since.IsNone() {
return nil
}
for _, t := range topics {
messages, err := s.cache.Messages(t.ID, since)
messages, err := s.cache.Messages(t.ID, since, scheduled)
if err != nil {
return err
}
@ -560,6 +601,32 @@ func (s *Server) updateStatsAndExpire() {
s.messages, len(s.topics), subscribers, messages, len(s.visitors))
}
func (s *Server) sendDelayedMessages() error {
s.mu.Lock()
defer s.mu.Unlock()
messages, err := s.cache.MessagesDue()
if err != nil {
return err
}
for _, m := range messages {
t, ok := s.topics[m.Topic] // If no subscribers, just mark message as published
if ok {
if err := t.Publish(m); err != nil {
log.Printf("unable to publish message %s to topic %s: %v", m.ID, m.Topic, err.Error())
}
if s.firebase != nil {
if err := s.firebase(m); err != nil {
log.Printf("unable to publish to Firebase: %v", err.Error())
}
}
}
if err := s.cache.MarkPublished(m); err != nil {
return err
}
}
return nil
}
func (s *Server) withRateLimit(w http.ResponseWriter, r *http.Request, handler func(w http.ResponseWriter, r *http.Request, v *visitor) error) error {
v := s.visitor(r)
if err := v.RequestAllowed(); err != nil {