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printer.go
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printer.go
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// Copyright 2015 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package printer
import (
"bytes"
"encoding/json"
"fmt"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/util/israce"
log "github.com/sirupsen/logrus"
)
// Version information.
var (
TiDBBuildTS = "None"
TiDBGitHash = "None"
TiDBGitBranch = "None"
GoVersion = "None"
// TiKVMinVersion is the minimum version of TiKV that can be compatible with the current TiDB.
TiKVMinVersion = "2.1.0-alpha.1-ff3dd160846b7d1aed9079c389fc188f7f5ea13e"
)
// PrintTiDBInfo prints the TiDB version information.
func PrintTiDBInfo() {
log.Infof("Welcome to TiDB.")
log.Infof("Release Version: %s", mysql.TiDBReleaseVersion)
log.Infof("Git Commit Hash: %s", TiDBGitHash)
log.Infof("Git Branch: %s", TiDBGitBranch)
log.Infof("UTC Build Time: %s", TiDBBuildTS)
log.Infof("GoVersion: %s", GoVersion)
log.Infof("Race Enabled: %v", israce.RaceEnabled)
log.Infof("Check Table Before Drop: %v", config.CheckTableBeforeDrop)
log.Infof("TiKV Min Version: %s", TiKVMinVersion)
configJSON, err := json.Marshal(config.GetGlobalConfig())
if err != nil {
panic(err)
}
log.Infof("Config: %s", configJSON)
}
// GetTiDBInfo returns the git hash and build time of this tidb-server binary.
func GetTiDBInfo() string {
return fmt.Sprintf("Release Version: %s\n"+
"Git Commit Hash: %s\n"+
"Git Branch: %s\n"+
"UTC Build Time: %s\n"+
"GoVersion: %s\n"+
"Race Enabled: %v\n"+
"TiKV Min Version: %s\n"+
"Check Table Before Drop: %v",
mysql.TiDBReleaseVersion,
TiDBGitHash,
TiDBGitBranch,
TiDBBuildTS,
GoVersion,
israce.RaceEnabled,
TiKVMinVersion,
config.CheckTableBeforeDrop)
}
// checkValidity checks whether cols and every data have the same length.
func checkValidity(cols []string, datas [][]string) bool {
colLen := len(cols)
if len(datas) == 0 || colLen == 0 {
return false
}
for _, data := range datas {
if colLen != len(data) {
return false
}
}
return true
}
func getMaxColLen(cols []string, datas [][]string) []int {
maxColLen := make([]int, len(cols))
for i, col := range cols {
maxColLen[i] = len(col)
}
for _, data := range datas {
for i, v := range data {
if len(v) > maxColLen[i] {
maxColLen[i] = len(v)
}
}
}
return maxColLen
}
func getPrintDivLine(maxColLen []int) []byte {
var value = make([]byte, 0)
for _, v := range maxColLen {
value = append(value, '+')
value = append(value, bytes.Repeat([]byte{'-'}, v+2)...)
}
value = append(value, '+')
value = append(value, '\n')
return value
}
func getPrintCol(cols []string, maxColLen []int) []byte {
var value = make([]byte, 0)
for i, v := range cols {
value = append(value, '|')
value = append(value, ' ')
value = append(value, []byte(v)...)
value = append(value, bytes.Repeat([]byte{' '}, maxColLen[i]+1-len(v))...)
}
value = append(value, '|')
value = append(value, '\n')
return value
}
func getPrintRow(data []string, maxColLen []int) []byte {
var value = make([]byte, 0)
for i, v := range data {
value = append(value, '|')
value = append(value, ' ')
value = append(value, []byte(v)...)
value = append(value, bytes.Repeat([]byte{' '}, maxColLen[i]+1-len(v))...)
}
value = append(value, '|')
value = append(value, '\n')
return value
}
func getPrintRows(datas [][]string, maxColLen []int) []byte {
var value = make([]byte, 0)
for _, data := range datas {
value = append(value, getPrintRow(data, maxColLen)...)
}
return value
}
// GetPrintResult gets a result with a formatted string.
func GetPrintResult(cols []string, datas [][]string) (string, bool) {
if !checkValidity(cols, datas) {
return "", false
}
var value = make([]byte, 0)
maxColLen := getMaxColLen(cols, datas)
value = append(value, getPrintDivLine(maxColLen)...)
value = append(value, getPrintCol(cols, maxColLen)...)
value = append(value, getPrintDivLine(maxColLen)...)
value = append(value, getPrintRows(datas, maxColLen)...)
value = append(value, getPrintDivLine(maxColLen)...)
return string(value), true
}