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Add title, priority, tags to cache; add schema migration

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This commit is contained in:
Philipp Heckel 2021-11-28 14:07:29 -05:00
parent 1b8ebab5f3
commit d4330e86ac
3 changed files with 127 additions and 19 deletions
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129
server/cache_sqlite.go
View file

@ -3,32 +3,61 @@ package server
import (
"database/sql"
"errors"
"fmt"
_ "github.com/mattn/go-sqlite3" // SQLite driver
"strings"
"time"
)
// Messages cache
const (
createTableQuery = `
createMessagesTableQuery = `
BEGIN;
CREATE TABLE IF NOT EXISTS messages (
id VARCHAR(20) PRIMARY KEY,
time INT NOT NULL,
topic VARCHAR(64) NOT NULL,
message VARCHAR(1024) NOT NULL
message VARCHAR(512) NOT NULL,
title VARCHAR(256) NOT NULL,
priority INT NOT NULL,
tags VARCHAR(256) NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_topic ON messages (topic);
COMMIT;
`
insertMessageQuery = `INSERT INTO messages (id, time, topic, message) VALUES (?, ?, ?, ?)`
insertMessageQuery = `INSERT INTO messages (id, time, topic, message, title, priority, tags) VALUES (?, ?, ?, ?, ?, ?, ?)`
pruneMessagesQuery = `DELETE FROM messages WHERE time < ?`
selectMessagesSinceTimeQuery = `
SELECT id, time, message
SELECT id, time, message, title, priority, tags
FROM messages
WHERE topic = ? AND time >= ?
ORDER BY time ASC
`
selectMessageCountQuery = `SELECT count(*) FROM messages WHERE topic = ?`
selectTopicsQuery = `SELECT topic, MAX(time) FROM messages GROUP BY TOPIC`
selectMessagesCountQuery = `SELECT COUNT(*) FROM messages`
selectMessageCountForTopicQuery = `SELECT count(*) FROM messages WHERE topic = ?`
selectTopicsQuery = `SELECT topic, MAX(time) FROM messages GROUP BY topic`
)
// Schema management queries
const (
currentSchemaVersion = 1
createSchemaVersionTableQuery = `
CREATE TABLE IF NOT EXISTS schemaVersion (
id INT PRIMARY KEY,
version INT NOT NULL
);
`
insertSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)`
selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
// 0 -> 1
migrate0To1AlterMessagesTableQuery = `
BEGIN;
ALTER TABLE messages ADD COLUMN title VARCHAR(256) NOT NULL DEFAULT('');
ALTER TABLE messages ADD COLUMN priority INT NOT NULL DEFAULT(0);
ALTER TABLE messages ADD COLUMN tags VARCHAR(256) NOT NULL DEFAULT('');
COMMIT;
`
)
type sqliteCache struct {
@ -42,7 +71,7 @@ func newSqliteCache(filename string) (*sqliteCache, error) {
if err != nil {
return nil, err
}
if _, err := db.Exec(createTableQuery); err != nil {
if err := setupDB(db); err != nil {
return nil, err
}
return &sqliteCache{
@ -51,7 +80,7 @@ func newSqliteCache(filename string) (*sqliteCache, error) {
}
func (c *sqliteCache) AddMessage(m *message) error {
_, err := c.db.Exec(insertMessageQuery, m.ID, m.Time, m.Topic, m.Message)
_, err := c.db.Exec(insertMessageQuery, m.ID, m.Time, m.Topic, m.Message, m.Title, m.Priority, strings.Join(m.Tags, ","))
return err
}
@ -64,19 +93,27 @@ func (c *sqliteCache) Messages(topic string, since sinceTime) ([]*message, error
messages := make([]*message, 0)
for rows.Next() {
var timestamp int64
var id, msg string
if err := rows.Scan(&id, &timestamp, &msg); err != nil {
var priority int
var id, msg, title, tagsStr string
if err := rows.Scan(&id, &timestamp, &msg, &title, &priority, &tagsStr); err != nil {
return nil, err
}
if msg == "" {
msg = " " // Hack: never return empty messages; this should not happen
}
var tags []string
if tagsStr != "" {
tags = strings.Split(tagsStr, ",")
}
messages = append(messages, &message{
ID: id,
Time: timestamp,
Event: messageEvent,
Topic: topic,
Message: msg,
ID: id,
Time: timestamp,
Event: messageEvent,
Topic: topic,
Message: msg,
Title: title,
Priority: priority,
Tags: tags,
})
}
if err := rows.Err(); err != nil {
@ -86,7 +123,7 @@ func (c *sqliteCache) Messages(topic string, since sinceTime) ([]*message, error
}
func (c *sqliteCache) MessageCount(topic string) (int, error) {
rows, err := c.db.Query(selectMessageCountQuery, topic)
rows, err := c.db.Query(selectMessageCountForTopicQuery, topic)
if err != nil {
return 0, err
}
@ -124,7 +161,63 @@ func (s *sqliteCache) Topics() (map[string]*topic, error) {
return topics, nil
}
func (c *sqliteCache) Prune(keep time.Duration) error {
_, err := c.db.Exec(pruneMessagesQuery, time.Now().Add(-1*keep).Unix())
func (s *sqliteCache) Prune(keep time.Duration) error {
_, err := s.db.Exec(pruneMessagesQuery, time.Now().Add(-1*keep).Unix())
return err
}
func setupDB(db *sql.DB) error {
// If 'messages' table does not exist, this must be a new database
rowsMC, err := db.Query(selectMessagesCountQuery)
if err != nil {
return setupNewDB(db)
}
defer rowsMC.Close()
// If 'messages' table exists, check 'schemaVersion' table
schemaVersion := 0
rowsSV, err := db.Query(selectSchemaVersionQuery)
if err == nil {
defer rowsSV.Close()
if !rowsSV.Next() {
return errors.New("cannot determine schema version: cache file may be corrupt")
}
if err := rowsSV.Scan(&schemaVersion); err != nil {
return err
}
}
// Do migrations
if schemaVersion == currentSchemaVersion {
return nil
} else if schemaVersion == 0 {
return migrateFrom0To1(db)
}
return fmt.Errorf("unexpected schema version found: %d", schemaVersion)
}
func setupNewDB(db *sql.DB) error {
if _, err := db.Exec(createMessagesTableQuery); err != nil {
return err
}
if _, err := db.Exec(createSchemaVersionTableQuery); err != nil {
return err
}
if _, err := db.Exec(insertSchemaVersion, currentSchemaVersion); err != nil {
return err
}
return nil
}
func migrateFrom0To1(db *sql.DB) error {
if _, err := db.Exec(migrate0To1AlterMessagesTableQuery); err != nil {
return err
}
if _, err := db.Exec(createSchemaVersionTableQuery); err != nil {
return err
}
if _, err := db.Exec(insertSchemaVersion, 1); err != nil {
return err
}
return nil
}

5
server/static/css/app.css
View file

@ -382,6 +382,11 @@ li {
font-size: 0.9em;
}
#detail .detailTitle {
font-weight: bold;
font-size: 1.1em;
}
#detail .detailMessage {
margin-bottom: 20px;
font-size: 1.1em;

12
server/static/js/app.js
View file

@ -86,10 +86,14 @@ const subscribeInternal = (topic, persist, delaySec) => {
}
if (Notification.permission === "granted") {
notifySound.play();
new Notification(`${location.host}/${topic}`, {
const title = (event.title) ? event.title : `${location.host}/${topic}`;
const notification = new Notification(title, {
body: event.message,
icon: '/static/img/favicon.png'
});
notification.onclick = (e) => {
showDetail(event.topic);
};
}
};
topics[topic] = {
@ -149,6 +153,7 @@ const rerenderDetailView = () => {
}
topics[currentTopic]['messages'].forEach(m => {
let dateDiv = document.createElement('div');
let titleDiv = document.createElement('div');
let messageDiv = document.createElement('div');
let eventDiv = document.createElement('div');
dateDiv.classList.add('detailDate');
@ -156,6 +161,11 @@ const rerenderDetailView = () => {
messageDiv.classList.add('detailMessage');
messageDiv.innerText = m.message;
eventDiv.appendChild(dateDiv);
if (m.title) {
titleDiv.classList.add('detailTitle');
titleDiv.innerText = m.title;
eventDiv.appendChild(titleDiv)
}
eventDiv.appendChild(messageDiv);
detailEventsList.appendChild(eventDiv);
})