tidb util 源码
tidb util 代码
文件路径：/util/util.go
// Copyright 2022 PingCAP, Inc.
//
// 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 util
import (
"encoding/json"
"io/ioutil"
"net/http"
"strconv"
"strings"
"github.com/pingcap/errors"
)
// SliceToMap converts slice to map
// nolint:unused
func SliceToMap(slice []string) map[string]interface{} {
sMap := make(map[string]interface{})
for _, str := range slice {
sMap[str] = struct{}{}
}
return sMap
}
// StringsToInterfaces converts string slice to interface slice
func StringsToInterfaces(strs []string) []interface{} {
is := make([]interface{}, 0, len(strs))
for _, str := range strs {
is = append(is, str)
}
return is
}
// GetJSON fetches a page and parses it as JSON. The parsed result will be
// stored into the `v`. The variable `v` must be a pointer to a type that can be
// unmarshalled from JSON.
//
// Example:
//
// client := &http.Client{}
// var resp struct { IP string }
// if err := util.GetJSON(client, "http://api.ipify.org/?format=json", &resp); err != nil {
// return errors.Trace(err)
// }
// fmt.Println(resp.IP)
func GetJSON(client *http.Client, url string, v interface{}) error {
resp, err := client.Get(url)
if err != nil {
return errors.Trace(err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return errors.Trace(err)
}
return errors.Errorf("get %s http status code != 200, message %s", url, string(body))
}
return errors.Trace(json.NewDecoder(resp.Body).Decode(v))
}
// ChanMap creates a channel which applies the function over the input Channel.
// Hint of Resource Leakage:
// In golang, channel isn't an interface so we must create a goroutine for handling the inputs.
// Hence the input channel must be closed properly or this function may leak a goroutine.
func ChanMap[T, R any](c <-chan T, f func(T) R) <-chan R {
outCh := make(chan R)
go func() {
defer close(outCh)
for item := range c {
outCh <- f(item)
}
}()
return outCh
}
// Str2Int64Map converts a string to a map[int64]struct{}.
func Str2Int64Map(str string) map[int64]struct{} {
strs := strings.Split(str, ",")
res := make(map[int64]struct{}, len(strs))
for _, s := range strs {
id, _ := strconv.ParseInt(s, 10, 64)
res[id] = struct{}{}
}
return res
}
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