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quassel-search.go
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quassel-search.go
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/*
Server for searching through quassel logs
Greg Schafer
Oct. 2013
References:
http://golang.org/pkg/database/sql/
https://github.com/mattn/go-sqlite3/blob/master/_example/simple/simple.go
*/
package main
import (
"code.google.com/p/gcfg"
"database/sql"
"encoding/json"
"flag"
"fmt"
_ "github.com/lib/pq"
_ "github.com/mattn/go-sqlite3"
"html/template"
"log"
"net/http"
"path"
"regexp"
"strconv"
"time"
)
func panicIfError(err error) {
if err != nil {
panic(err)
}
}
// ===== Models =====
type resultSet struct {
Needle string
ChannelResults []channelResult
}
type channelResult struct {
Channel string
Messages []message
}
type sender struct {
Username string
FullIdent string
}
var re = regexp.MustCompile("(.*)!~?(.*)")
func makeSender(rawSender string) sender {
m := re.FindStringSubmatch(rawSender)
if len(m) == 3 {
return sender{m[1], m[2]}
}
return sender{rawSender, rawSender}
}
type message struct {
MessageId int
Time time.Time
Channel string
Sender sender
Text string
}
type frontpageStats struct {
NumMessages int
NumSenders int
NumChannels int
}
// ===== Database =====
var db *sql.DB
// messagesFromRows returns a synchronous channel of messages
func messagesFromRows(rows *sql.Rows) chan message {
messages := make(chan message)
go func() {
defer rows.Close()
defer close(messages)
for rows.Next() {
var messageid int
var msgTime interface{}
var convertedTime time.Time
var buffercname, msgSender, msg string
err := rows.Scan(&messageid, &buffercname, &msgSender, &msgTime, &msg)
panicIfError(err)
// sqlite returns date as int64, postgres returns as time.Time
switch msgTime := msgTime.(type) {
case int64:
convertedTime = time.Unix(msgTime, 0)
case time.Time:
convertedTime = msgTime
default:
panic(fmt.Errorf("unrecognized datetime format for backlog messageid=%d?", messageid))
}
m := message{MessageId: messageid,
Time: convertedTime,
Channel: buffercname,
Sender: makeSender(msgSender),
Text: msg}
messages <- m
}
}()
return messages
}
func searchResults(needle string) resultSet {
sql_needle := "%" + needle + "%"
rows, err := db.Query("select messageid,buffercname,sender,time,message from backlog natural join sender natural join buffer where type = 1 and message like $1", sql_needle)
panicIfError(err)
results := resultSet{Needle: needle, ChannelResults: make([]channelResult, 0)}
channels := make(map[string][]message)
for m := range messagesFromRows(rows) {
channels[m.Channel] = append(channels[m.Channel], m)
}
for channel, messages := range channels {
cr := channelResult{Channel: channel, Messages: messages}
results.ChannelResults = append(results.ChannelResults, cr)
}
return results
}
// returns counts for # messages, # users, # channels
func getFrontpageStats() frontpageStats {
var stats frontpageStats
var row *sql.Row
var err error
row = db.QueryRow("select count(*) from backlog")
err = row.Scan(&stats.NumMessages)
panicIfError(err)
row = db.QueryRow("select count(*) from sender")
err = row.Scan(&stats.NumSenders)
panicIfError(err)
row = db.QueryRow("select count(*) from buffer")
err = row.Scan(&stats.NumChannels)
panicIfError(err)
return stats
}
// direction in which to fetch contextual messages
const (
BeforeDirection = -1
AfterDirection = 1
)
var dirComparators = map[int]string{
BeforeDirection: "<",
AfterDirection: ">",
}
var dirSort = map[int]string{
BeforeDirection: "desc",
AfterDirection: "asc",
}
func messageContext(messageId int, linesToFetch int, direction int) []message {
if direction != -1 && direction != 1 {
panic(fmt.Errorf("direction argument must be 1 or -1"))
}
row := db.QueryRow("select bufferid from backlog where messageid = $1", messageId)
var bufferid int
err := row.Scan(&bufferid)
panicIfError(err)
query := fmt.Sprintf(`select messageid,buffercname,sender,time,message
from backlog
natural join sender
natural join buffer
where messageid %s $1
and bufferid = $2
and type = 1
order by messageid %s
limit $3`, dirComparators[direction], dirSort[direction])
rows, err := db.Query(query, messageId, bufferid, linesToFetch)
panicIfError(err)
results := make([]message, 0)
for m := range messagesFromRows(rows) {
results = append(results, m)
}
return results
}
// ===== Web server =====
// matches "/", "/search/", and "/context/"
var validPath = regexp.MustCompile(`^/($|(search|context)\/)`)
func tmplPaths(tmpl ...string) []string {
paths := make([]string, len(tmpl))
for i, p := range tmpl {
paths[i] = path.Join("templates", p)
}
return paths
}
var templatePaths = tmplPaths("index.html", "search.html")
var templates = template.Must(template.ParseFiles(templatePaths...))
func renderTemplate(w http.ResponseWriter, tmpl string, data interface{}) {
err := templates.ExecuteTemplate(w, tmpl+".html", data)
panicIfError(err)
}
func indexHandler(w http.ResponseWriter, r *http.Request) {
stats := getFrontpageStats()
renderTemplate(w, "index", stats)
}
func searchHandler(w http.ResponseWriter, r *http.Request) {
needle := r.FormValue("n")
if needle == "" {
panic(fmt.Errorf("no search term provided"))
}
results := searchResults(needle)
renderTemplate(w, "search", results)
}
func ajaxContextHandler(w http.ResponseWriter, r *http.Request) {
messageId, err := strconv.Atoi(r.FormValue("messageId"))
panicIfError(err)
linesToFetch, err := strconv.Atoi(r.FormValue("linesToFetch"))
panicIfError(err)
direction, err := strconv.Atoi(r.FormValue("direction"))
panicIfError(err)
results := messageContext(messageId, linesToFetch, direction)
jsres, err := json.Marshal(results)
panicIfError(err)
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(jsres)
panicIfError(err)
}
func makeHandler(fn func(http.ResponseWriter, *http.Request)) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
isValidPath := validPath.MatchString(r.URL.Path)
if !isValidPath {
http.NotFound(w, r)
return
}
// recover from handler panics
defer func() {
if r := recover(); r != nil {
err, ok := r.(error)
if !ok {
log.Fatalf("panic didn't return a string? got %T with value: %v", r, r)
}
log.Print(err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}()
fn(w, r)
}
}
// ===== Config Structs =====
type DbConfig struct {
DbType string // postgres or sqlite3
DbPath string // path to database file (sqlite only)
DbName string // name of database (postgres only)
DbUser string // name of database user (postgres only)
DbPass string // password of database user (postgres only)
}
type WebserverConfig struct {
Port int // port to serve log-search website at (default: 4243)
}
type Configuration struct {
Database DbConfig
Webserver WebserverConfig
}
// ===== Main =====
func main() {
var cfgPath = flag.String("config", "conf.gcfg", "Path to config file")
flag.Parse()
log.Print("Reading config from ", *cfgPath)
var err error
var configuration Configuration
err = gcfg.ReadFileInto(&configuration, *cfgPath)
panicIfError(err)
var dataSourceName string
switch configuration.Database.DbType {
case "sqlite3":
dataSourceName = configuration.Database.DbPath
case "postgres":
dataSourceName = fmt.Sprintf("user=%s password=%s dbname=%s",
configuration.Database.DbUser,
configuration.Database.DbPass,
configuration.Database.DbName)
default:
log.Fatalf("%v not a recognized database type (sqlite3 or postgres)", configuration.Database.DbType)
}
db, err = sql.Open(configuration.Database.DbType, dataSourceName)
panicIfError(err)
defer db.Close()
err = db.Ping()
panicIfError(err)
http.HandleFunc("/", makeHandler(indexHandler))
http.HandleFunc("/search/", makeHandler(searchHandler))
http.HandleFunc("/context/", makeHandler(ajaxContextHandler))
http.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.Dir("assets"))))
log.Print("Starting to listen on port ", configuration.Webserver.Port)
err = http.ListenAndServe(fmt.Sprintf(":%d", configuration.Webserver.Port), nil)
panicIfError(err)
}