/
plenty.go
143 lines (126 loc) · 2.91 KB
/
plenty.go
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// go get github.com/bmizerany/pq
// go get github.com/dlintw/goconf
package main
import (
"github.com/bmizerany/pq"
"github.com/dlintw/goconf"
"database/sql"
"fmt"
"net/http"
"io/ioutil"
"encoding/json"
"unicode/utf8"
"strings"
"time"
"os"
"log"
)
type Link struct {
url string
subreddit string
title string
}
type RedditJSON struct {
Data struct {
Children []struct {
Data struct {
Title string
Url string
}
}
}
}
func main() {
http.HandleFunc("/fetch", plenty)
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
err := http.ListenAndServe(":"+port, nil)
if err != nil {
log.Fatal("ListenAndServe:", err)
}
}
func plenty(w http.ResponseWriter, req *http.Request) {
go func() {
subs := []string{"ruby", "golang", "python", "javascript", "clojure", "scala"}
for _, sub := range subs {
fmt.Println(sub)
links := GetRedditLinks(sub)
SaveLinks(links)
}
}()
}
func getdb() *sql.DB {
var settings, herokupg, localpg string
herokupg = os.Getenv("DATABASE_URL")
if herokupg != "" {
settings, _ = pq.ParseURL(herokupg)
} else {
c, _ := goconf.ReadConfigFile("db.config")
localpg, _ = c.GetString("dev", "postgresurl")
settings, _ = pq.ParseURL(localpg)
}
db, _ := sql.Open("postgres", settings)
return db
}
func GetLinks() []Link {
db := getdb()
defer db.Close()
rows, _ := db.Query("SELECT url, subreddit, title FROM links ORDER BY created_at LIMIT 50")
results := []Link{}
for rows.Next() {
link := new(Link)
rows.Scan(&link.url, &link.subreddit, &link.title)
results = append(results, *link)
}
return results
}
func SaveLinks(links []Link) {
db := getdb()
defer db.Close()
for _, link := range links {
db.Exec("INSERT INTO links (url, subreddit, title, created_at) VALUES ($1, $2, $3, $4)", link.url, link.subreddit, link.title, time.Now())
}
}
func GetRedditLinks(sub string) []Link {
response, _ := http.Get("http://www.reddit.com/r/" + sub + ".json?limit=100")
defer response.Body.Close()
contents, _ := ioutil.ReadAll(response.Body)
var stories RedditJSON
json.Unmarshal(contents, &stories)
children := stories.Data.Children
links := []Link{}
for _, child := range children {
if IsNotReddit(child.Data.Url) {
link := Link{url: child.Data.Url, subreddit: sub, title: child.Data.Title}
links = append(links, link)
}
}
return links
}
func Contains(seq[]Link, url string) bool{
for _, link := range seq {
if link.url == url {
return true
}
}
return false
}
func IsNotReddit(url string) bool {
if strings.Contains(url, "reddit") {
return false
}
return true
}
func NoShortUrl(url string) bool {
count := utf8.RuneCountInString(url)
if count > 25 {
return true
}
return false
}
func GoodUrl(links []Link, url string) bool {
res := !Contains(links, url) && NoShortUrl(url)
return res
}