Submitted by admin on 2019, July 31, 8:24 PM
可以通过传参数，比如
db.stats(1024)
得到的是kb单位的
db.stats(1073741824);
-------
- var collNames = db.getCollectionNames();
- for (var i = 0; i < collNames.length; i++) {
- var coll = db.getCollection(collNames[i]);
- var stats = coll.stats(1024 * 1024);
- print(stats.ns, stats.storageSize);
- }
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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 2019, March 20, 10:48 PM
db.runCommand({cloneCollection:"ball.othermatch",from:"127.0.0.1:27017"})
https://blog.csdn.net/wulex/article/details/83479516
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Submitted by admin on 2019, January 25, 2:18 PM
git rm -r --cached .
git add .
git commit -m 'update .gitignore'
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Submitted by admin on 2019, January 25, 9:39 AM
git
SSL Error: unable to get local issuer certificate
git config --global http.sslVerify false
git http\https\git免密设置记住用户名和密码的方法
设置记住密码（默认15分钟）：
git config --global credential.helper cache
如果想自己设置时间，可以这样做：
git config credential.helper 'cache --timeout=3600'
这样就设置一个小时之后失效
长期存储密码：
git config --global credential.helper store
增加远程地址的时候带上密码也是可以的。(推荐)
http://yourname:password@git.oschina.net/name/project.git
补充：使用客户端也可以存储密码的。
如果你正在使用ssh而且想体验https带来的高速，那么你可以这样做： 切换到项目目录下 ：
cd projectfile/
移除远程ssh方式的仓库地址
git remote rm origin
增加https远程仓库地址
git remote add origin http://yourname:password@git.oschina.net/name/project.git
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Submitted by admin on 2019, January 24, 6:02 PM
问题
报错：error: The requested URL returned error: 401 Unauthorized while accessing
git版本：1.7.1
解决方法一：指定用户
git clone https://github.com/org/project.git
换成
git clone https://username@github.com/org/project.git
或者
git clone https://username:password@github.com/org/project.git
在push或者pull出出现的话，则需要更改远程地址
git remote set-url origin https://username@github.com/org/project.git
解决方法二：去除验证
git config –global http.sslverify false
解决方法三：（推荐）
升级git 版本≥1.7.10
解决方法四：
添加ssh秘钥
--------------
刚创建的github版本库，在push代码时出错：
$ git push -u origin master To git@github.com:******/Demo.git ! [rejected] master -> master (non-fast-forward) error: failed to push some refs to 'git@github.com:******/Demo.git' hint: Updates were rejected because the tip of your current branch is behind hint: its remote counterpart. Merge the remote changes (e.g. 'git pull') hint: before pushing again. hint: See the 'Note about fast-forwards' in 'git push --help' for details.
网上搜索了下，是因为远程repository和我本地的repository冲突导致的，而我在创建版本库后，在github的版本库页面点击了创建README.md文件的按钮创建了说明文档，但是却没有pull到本地。这样就产生了版本冲突的问题。
有如下几种解决方法：
1.使用强制push的方法：
$ git push -u origin master -f
这样会使远程修改丢失，一般是不可取的，尤其是多人协作开发的时候。
2.push前先将远程repository修改pull下来
$ git pull origin master
$ git push -u origin master
3.若不想merge远程和本地修改，可以先创建新的分支：
$ git branch [name]
然后push
$ git push -u origin [name]
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