package oss import ( "bytes" "errors" "fmt" "hash/crc64" "net/http" "os" "os/exec" "runtime" "time" ) // Get User Agent // Go sdk相关信息,包括sdk版本,操作系统类型,GO版本 var userAgent = func() string { sys := getSysInfo() return fmt.Sprintf("aliyun-sdk-go/%s (%s/%s/%s;%s)", Version, sys.name, sys.release, sys.machine, runtime.Version()) }() type sysInfo struct { name string // 操作系统名称windows/Linux release string // 操作系统版本 2.6.32-220.23.2.ali1089.el5.x86_64等 machine string // 机器类型amd64/x86_64 } // Get system info // 获取操作系统信息、机器类型 func getSysInfo() sysInfo { name := runtime.GOOS release := "-" machine := runtime.GOARCH if out, err := exec.Command("uname", "-s").CombinedOutput(); err == nil { name = string(bytes.TrimSpace(out)) } if out, err := exec.Command("uname", "-r").CombinedOutput(); err == nil { release = string(bytes.TrimSpace(out)) } if out, err := exec.Command("uname", "-m").CombinedOutput(); err == nil { machine = string(bytes.TrimSpace(out)) } return sysInfo{name: name, release: release, machine: machine} } // GetNowSec returns Unix time, the number of seconds elapsed since January 1, 1970 UTC. // 获取当前时间,从UTC开始的秒数。 func GetNowSec() int64 { return time.Now().Unix() } // GetNowNanoSec returns t as a Unix time, the number of nanoseconds elapsed // since January 1, 1970 UTC. The result is undefined if the Unix time // in nanoseconds cannot be represented by an int64. Note that this // means the result of calling UnixNano on the zero Time is undefined. // 获取当前时间,从UTC开始的纳秒。 func GetNowNanoSec() int64 { return time.Now().UnixNano() } // GetNowGMT 获取当前时间,格式形如"Mon, 02 Jan 2006 15:04:05 GMT",HTTP中使用的时间格式 func GetNowGMT() string { return time.Now().UTC().Format(http.TimeFormat) } // FileChunk 文件片定义 type FileChunk struct { Number int // 块序号 Offset int64 // 块在文件中的偏移量 Size int64 // 块大小 } // SplitFileByPartNum Split big file to part by the num of part // 按指定的块数分割文件。返回值FileChunk为分割结果,error为nil时有效。 func SplitFileByPartNum(fileName string, chunkNum int) ([]FileChunk, error) { if chunkNum <= 0 || chunkNum > 10000 { return nil, errors.New("chunkNum invalid") } file, err := os.Open(fileName) if err != nil { return nil, err } defer file.Close() stat, err := file.Stat() if err != nil { return nil, err } if int64(chunkNum) > stat.Size() { return nil, errors.New("oss: chunkNum invalid") } var chunks []FileChunk var chunk = FileChunk{} var chunkN = (int64)(chunkNum) for i := int64(0); i < chunkN; i++ { chunk.Number = int(i + 1) chunk.Offset = i * (stat.Size() / chunkN) if i == chunkN-1 { chunk.Size = stat.Size()/chunkN + stat.Size()%chunkN } else { chunk.Size = stat.Size() / chunkN } chunks = append(chunks, chunk) } return chunks, nil } // SplitFileByPartSize Split big file to part by the size of part // 按块大小分割文件。返回值FileChunk为分割结果,error为nil时有效。 func SplitFileByPartSize(fileName string, chunkSize int64) ([]FileChunk, error) { if chunkSize <= 0 { return nil, errors.New("chunkSize invalid") } file, err := os.Open(fileName) if err != nil { return nil, err } defer file.Close() stat, err := file.Stat() if err != nil { return nil, err } var chunkN = stat.Size() / chunkSize if chunkN >= 10000 { return nil, errors.New("Too many parts, please increase part size.") } var chunks []FileChunk var chunk = FileChunk{} for i := int64(0); i < chunkN; i++ { chunk.Number = int(i + 1) chunk.Offset = i * chunkSize chunk.Size = chunkSize chunks = append(chunks, chunk) } if stat.Size()%chunkSize > 0 { chunk.Number = len(chunks) + 1 chunk.Offset = int64(len(chunks)) * chunkSize chunk.Size = stat.Size() % chunkSize chunks = append(chunks, chunk) } return chunks, nil } // GetPartEnd 计算结束位置 func GetPartEnd(begin int64, total int64, per int64) int64 { if begin+per > total { return total - 1 } return begin + per - 1 } // crcTable returns the Table constructed from the specified polynomial var crcTable = func() *crc64.Table { return crc64.MakeTable(crc64.ECMA) }