Submitted by admin on 2019, May 14, 5:14 PM
package main
import (
"flag"
"log"
"net/url"
"os"
"os/signal"
"time"
"github.com/gorilla/websocket"
"net/http"
)
var addrWebsocket = flag.String("addrWebsocket", "echo.websocket.org", "http service address")
func main() {
flag.Parse()
log.SetFlags(0)
interrupt := make(chan os.Signal, 1)
signal.Notify(interrupt, os.Interrupt)
//Initialize the WebSocket URL and the Path to follow
uWS := url.URL{Scheme: "wss", Host: *addrWebsocket}
//Initialize the Proxy URL and the Path to follow
uProxy, _ := url.Parse("https://hide.me/en/proxy")
//Set the Dialer (especially the proxy)
dialer := websocket.Dialer{
Proxy: http.ProxyURL(uProxy),
}
//dialer := websocket.DefaultDialer ==> with this default dialer, it works !
c, _, err := dialer.Dial(uWS.String(), nil) // ==> With the proxy config, it fails here !
defer c.Close()
done := make(chan struct{})
go func() {
defer c.Close()
defer close(done)
for {
_, message, err := c.ReadMessage()
if err != nil {
log.Println("read:", err)
return
}
log.Printf("recv: %s", message)
}
}()
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for {
select {
case t := <-ticker.C:
err := c.WriteMessage(websocket.TextMessage, []byte(t.String()))
if err != nil {
log.Println("write:", err)
return
}
case <-interrupt:
log.Println("interrupt")
err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
if err != nil {
log.Println("write close:", err)
return
}
select {
case <-done:
case <-time.After(time.Second):
}
c.Close()
return
}
}
}
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Submitted by admin on 2019, April 29, 2:51 PM
rand.Intn () 函数是个伪随机函数，不管运行多少次都只会返回同样的随机数，因为它默认的资源就是单一值，所以必须调用 rand.Seed (), 并且传入一个变化的值作为参数，如 time.Now().UnixNano() , 就是可以生成时刻变化的值.
package main
import ("fmt"
"math/rand"
"time")
func main() {
// 初始化随机数的资源库, 如果不执行这行, 不管运行多少次都返回同样的值
rand.Seed(time.Now().UnixNano())
fmt.Println("A number from 1-100", rand.Intn(81))
}
--------------
//rand.Float64 返回一个64位浮点数 f，0.0 <= f <= 1.0。
fmt.Println(rand.Float64())
//这个技巧可以用来生成其他范围的随机浮点数，例如5.0 <= f <= 10.0
fmt.Print((rand.Float64()*5)+5, ",")
fmt.Print((rand.Float64() * 5) + 5)
fmt.Println()
//要让伪随机数生成器有确定性，可以给它一个明确的种子。
s1 := rand.NewSource(42)
r1 := rand.New(s1)
//调用上面返回的 rand.Source 的函数和调用 rand 包中函数是相同的。
fmt.Print(r1.Intn(100), ",")
fmt.Print(r1.Intn(100))
fmt.Println()
如果使用相同的种子生成的随机数生成器，将会产生相同的随机数序列。
s2 := rand.NewSource(42)
r2 := rand.New(s2)
fmt.Print(r2.Intn(100), ",")
fmt.Print(r2.Intn(100))
fmt.Println()
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Submitted by admin on 2019, April 18, 11:04 AM
package tools
import (
"crypto/md5"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"errors"
)
const (
base64Table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
)
var coder = base64.NewEncoding(base64Table)
func Base64Encode(src []byte) []byte {
return []byte(coder.EncodeToString(src))
}
func Base64Decode(src []byte) ([]byte, error) {
return coder.DecodeString(string(src))
}
func RsaEncrypt(origData []byte, publicKey string) ([]byte, error) {
block, _ := pem.Decode([]byte(publicKey))
if block == nil {
return nil, errors.New("public key error")
}
pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
pub := pubInterface.(*rsa.PublicKey)
return rsa.EncryptPKCS1v15(rand.Reader, pub, origData)
}
func RsaDecrypt(ciphertext []byte, privateKey string) ([]byte, error) {
block, _ := pem.Decode([]byte(privateKey))
if block == nil {
return nil, errors.New("private key error!")
}
priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)
}
func Md5Encrypt(data string) string {
md5Ctx := md5.New() //md5 init
md5Ctx.Write([]byte(data)) //md5 updata
cipherStr := md5Ctx.Sum(nil) //md5 final
encryptedData := hex.EncodeToString(cipherStr) //hex_digest
return encryptedData
}
--------
https://blog.csdn.net/yue7603835/article/details/73433617
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Submitted by admin on 2018, July 24, 11:27 AM
https://studygolang.com/articles/5776
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Submitted by admin on 2018, July 23, 3:08 PM
XML/HTML代码
- type SafeMap struct {
- sync.RWMutex
- Map map[int64]string
- }
-
- func NewSafeMap(size int) *SafeMap {
- sm := new(SafeMap)
- sm.Map = make(map[int64]string, size)
- return sm
- }
-
- func (sm *SafeMap) ReadMap(key int64) string {
- sm.RLock()
- value := sm.Map[key]
- sm.RUnlock()
- return value
- }
-
- func (sm *SafeMap) WriteMap(key int64, value string) {
- sm.Lock()
- sm.Map[key] = value
- sm.Unlock()
- }
-
- // 用于for k，_ := range m.Keys(){v := m.ReadMap(k) ....}
- func (sm *SafeMap) Keys() []int64 {
- sm.RLock()
- value := make([]int64, 0)
- for k, _ := range sm.Map {
- value = append(value, k)
- }
- sm.RUnlock()
- return value
- }
https://blog.csdn.net/qq_17612199/article/details/79601222
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Submitted by admin on 2018, July 6, 4:35 PM
1、问题
conn, err := net.Dial(“tcp”, ‘127.0.0.1:50001’)
执行此语句报错详细报错信息
dial tcp 127.0.0.1:50001: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
此报错的原因一般是系统端口已用尽，无法再建立新的Socket连接
https://blog.csdn.net/xia_xing/article/details/53352658
服务器 TIME_WAIT和CLOSE_WAIT
https://blog.csdn.net/xia_xing/article/details/53352486
常见SOCKET错误参数
https://blog.csdn.net/macky0668/article/details/4257721
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Submitted by admin on 2018, June 30, 12:42 PM
从上面访问的结果发现。我们这边的< 之类的符号已经被转义成html 特殊符
上面的方法也是可以进行简化的
package main import ( "fmt" "html/template" "log" "net/http" ) func main() { //绑定路由 讲访问 / 绑定给 Handler 方法进行处理 http.HandleFunc("/", Handler) http.ListenAndServe(":8080", nil) } func Handler(w http.ResponseWriter, req *http.Request) { err := req.ParseForm() //如果解析失败 直接退出 输出对应的错误原因 if err != nil { log.Fatal(nil) } //获取 传递的name 参数 user_pro := req.FormValue("name") fmt.Fprintf(w, "%s", xss_hander(user_pro)) } func xss_hander(s string) string { return template.HTMLEscapeString(s) }https://blog.csdn.net/liangguangchuan/article/details/54617685
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Submitted by admin on 2018, June 30, 10:25 AM
https://blog.csdn.net/easternunbeaten/article/details/72456240
https://beego.me/docs/mvc/model/transaction.md
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