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main.go
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main.go
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// Copyright 2019 Teodor Spæren
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"fmt"
"log"
"net/http"
"os"
"strings"
"time"
)
var (
dbPath = flag.String("db", "testdir/testdb", "the location of the bolt database")
)
func printTableOfLang(tis []TrendingItem) error {
for i, ti := range tis {
stars := ti.Stars
starsToday := ti.StarsIncrease
forks := ti.Forks
lang := ti.Language
titlelink := ti.RepoOwner + "/" + ti.RepoName
descr := ti.Description
pdesc := descr
if len(pdesc) > 70 {
pdesc = pdesc[:70] + "..."
}
fmt.Printf("%2d: %7d : %5d : %7d : %-10s : %-50s : %s\n", i, stars, starsToday, forks, lang, titlelink, pdesc)
}
return nil
}
func cmdFollows(c *Crawler) error {
fs, err := c.Follows()
if err != nil {
return err
}
for _, f := range fs {
fmt.Println(f.StoreName)
}
return nil
}
func cmdServe(c *Crawler) error {
hh := NewWebsite(c)
if err := http.ListenAndServe(":8099", hh); err != nil {
return err
}
return nil
}
func cmdFollow(c *Crawler) error {
var ls []Language
for i := 1; i < flag.NArg(); i++ {
l, ok := StoreToLang[flag.Arg(i)]
if !ok {
return fmt.Errorf("Unknown language: %s", flag.Arg(i))
}
ls = append(ls, l)
}
for _, l := range ls {
if err := c.Follow(l); err != nil {
return err
}
}
return nil
}
func cmdUnfollow(c *Crawler) error {
var ls []Language
for i := 1; i < flag.NArg(); i++ {
l, ok := StoreToLang[flag.Arg(i)]
if !ok {
return fmt.Errorf("Unknown language: %s", flag.Arg(i))
}
ls = append(ls, l)
}
for _, l := range ls {
if err := c.Unfollow(l); err != nil {
return err
}
}
return nil
}
func cmdRefresh(c *Crawler) error {
return c.Refresh()
}
func cmdServeAndRefresh(c *Crawler) error {
go func(c *Crawler) {
for {
if err := c.Refresh(); err != nil {
log.Printf("[ERR] Couldn't refresh: %s\n", err.Error())
}
time.Sleep(4 * time.Hour)
}
}(c)
hh := NewWebsite(c)
if err := http.ListenAndServe(":8099", hh); err != nil {
return err
}
return nil
}
func Usage() {
fmt.Println(`use one of the commands:
follow <lang to follow>+
follows
unfollow <lang to unfollow>+
refresh
serve
serveandrefresh`)
os.Exit(1)
}
func main() {
flag.Parse()
var fx func(c *Crawler) error
var err error
switch strings.ToLower(flag.Arg(0)) {
case "follows":
if flag.NArg() != 1 {
Usage()
}
fx = cmdFollows
case "follow":
if flag.NArg() < 2 {
Usage()
}
fx = cmdFollow
case "unfollow":
if flag.NArg() < 2 {
Usage()
}
fx = cmdUnfollow
case "serve":
if flag.NArg() != 1 {
Usage()
}
fx = cmdServe
case "refresh":
if flag.NArg() != 1 {
Usage()
}
fx = cmdRefresh
case "serveandrefresh":
if flag.NArg() != 1 {
Usage()
}
fx = cmdServeAndRefresh
default:
Usage()
}
c, err := NewCrawler(*dbPath)
if err != nil {
log.Fatal(err)
}
defer c.Close()
if err := fx(c); err != nil {
log.Fatal(err)
}
}