110 lines
2.0 KiB
Go
110 lines
2.0 KiB
Go
// Copyright 2016 Robert S. Gerus. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/http/cookiejar"
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"sync"
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"time"
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)
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type tip struct {
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Number int `json:"number"`
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Tip string `json:"tip"`
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}
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type tips struct {
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Tips []tip `json:"tips"`
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lock sync.RWMutex
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}
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func (tips *tips) fetchTips() error {
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tips.lock.Lock()
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defer tips.lock.Unlock()
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data, err := httpGet("http://frog.tips/api/1/tips/")
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if err != nil {
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return err
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}
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err = json.Unmarshal(data, tips)
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if err != nil {
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return err
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}
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return nil
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}
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func (tips *tips) popTip() string {
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if len(tips.Tips) == 0 {
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if err := tips.fetchTips(); err != nil {
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return fmt.Sprint(err)
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}
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}
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tips.lock.RLock()
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defer tips.lock.RUnlock()
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rmsg := tips.Tips[len(tips.Tips)-1].Tip
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tips.Tips = tips.Tips[:len(tips.Tips)-1]
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return rmsg
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}
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func main() {
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var t tips
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for {
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fmt.Println(t.popTip())
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}
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}
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func httpGet(link string) ([]byte, error) {
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var buf []byte
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cj, err := cookiejar.New(nil)
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tr := &http.Transport{
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TLSHandshakeTimeout: 20 * time.Second,
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ResponseHeaderTimeout: 20 * time.Second,
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}
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client := &http.Client{
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Transport: tr,
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Jar: cj,
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}
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req, err := http.NewRequest("GET", link, nil)
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if err != nil {
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return []byte{}, err
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}
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req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.152 Safari/537.36")
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resp, err := client.Do(req)
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if err != nil {
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return []byte{}, err
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}
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defer resp.Body.Close()
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// 5MiB
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if resp.ContentLength > 5*1024*1024 || resp.ContentLength < 0 {
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buf = make([]byte, 5*1024*1024)
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} else if resp.ContentLength == 0 {
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return []byte{}, nil
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} else {
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buf = make([]byte, resp.ContentLength)
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}
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i, err := io.ReadFull(resp.Body, buf)
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if err == io.ErrUnexpectedEOF {
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buf = buf[:i]
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} else if err != nil {
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return []byte{}, err
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}
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return buf, nil
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}
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