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utils.go
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utils.go
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// Copyright (c) 2017 VMware, Inc. All Rights Reserved.
//
// 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 utils
import (
"crypto/rand"
"encoding/json"
"errors"
"fmt"
"net"
"net/url"
"reflect"
"strconv"
"strings"
"time"
"github.com/vmware/harbor/src/common/utils/log"
)
// ParseEndpoint parses endpoint to a URL
func ParseEndpoint(endpoint string) (*url.URL, error) {
endpoint = strings.Trim(endpoint, " ")
endpoint = strings.TrimRight(endpoint, "/")
if len(endpoint) == 0 {
return nil, fmt.Errorf("empty URL")
}
i := strings.Index(endpoint, "://")
if i >= 0 {
scheme := endpoint[:i]
if scheme != "http" && scheme != "https" {
return nil, fmt.Errorf("invalid scheme: %s", scheme)
}
} else {
endpoint = "http://" + endpoint
}
return url.ParseRequestURI(endpoint)
}
// ParseRepository splits a repository into two parts: project and rest
func ParseRepository(repository string) (project, rest string) {
repository = strings.TrimLeft(repository, "/")
repository = strings.TrimRight(repository, "/")
if !strings.ContainsRune(repository, '/') {
rest = repository
return
}
index := strings.Index(repository, "/")
project = repository[0:index]
rest = repository[index+1:]
return
}
// GenerateRandomString generates a random string
func GenerateRandomString() string {
length := 32
const chars = "abcdefghijklmnopqrstuvwxyz0123456789"
l := len(chars)
result := make([]byte, length)
_, err := rand.Read(result)
if err != nil {
log.Warningf("Error reading random bytes: %v", err)
}
for i := 0; i < length; i++ {
result[i] = chars[int(result[i])%l]
}
return string(result)
}
// TestTCPConn tests TCP connection
// timeout: the total time before returning if something is wrong
// with the connection, in second
// interval: the interval time for retring after failure, in second
func TestTCPConn(addr string, timeout, interval int) error {
success := make(chan int)
cancel := make(chan int)
go func() {
for {
select {
case <-cancel:
break
default:
conn, err := net.DialTimeout("tcp", addr, time.Duration(timeout)*time.Second)
if err != nil {
log.Errorf("failed to connect to tcp://%s, retry after %d seconds :%v",
addr, interval, err)
time.Sleep(time.Duration(interval) * time.Second)
continue
}
if err = conn.Close(); err != nil {
log.Errorf("failed to close the connection: %v", err)
}
success <- 1
break
}
}
}()
select {
case <-success:
return nil
case <-time.After(time.Duration(timeout) * time.Second):
cancel <- 1
return fmt.Errorf("failed to connect to tcp:%s after %d seconds", addr, timeout)
}
}
// ParseTimeStamp parse timestamp to time
func ParseTimeStamp(timestamp string) (*time.Time, error) {
i, err := strconv.ParseInt(timestamp, 10, 64)
if err != nil {
return nil, err
}
t := time.Unix(i, 0)
return &t, nil
}
//ConvertMapToStruct is used to fill the specified struct with map.
func ConvertMapToStruct(object interface{}, values interface{}) error {
if object == nil {
return errors.New("nil struct is not supported")
}
if reflect.TypeOf(object).Kind() != reflect.Ptr {
return errors.New("object should be referred by pointer")
}
bytes, err := json.Marshal(values)
if err != nil {
return err
}
return json.Unmarshal(bytes, object)
}
// ParseProjectIDOrName parses value to ID(int64) or name(string)
func ParseProjectIDOrName(value interface{}) (int64, string, error) {
if value == nil {
return 0, "", errors.New("harborIDOrName is nil")
}
var id int64
var name string
switch value.(type) {
case int:
i := value.(int)
id = int64(i)
case int64:
id = value.(int64)
case string:
name = value.(string)
default:
return 0, "", fmt.Errorf("unsupported type")
}
return id, name, nil
}