essentials.v0: aahframework.org/essentials.v0 Index | Files

package ess

import "aahframework.org/essentials.v0"

Package ess provides simple & useful util functions for Go. aah framework utilizes essentials library across.

Index

Package Files

archive.go encode.go essentials.go filepath.go fmt_flag.go format.go go.go guid.go io.go os.go random_key.go reflect.go string.go url.go version.go

Constants

const (
    ByteSize     = 1.0
    KiloByteSize = 1024 * ByteSize
    MegaByteSize = 1024 * KiloByteSize
    GigaByteSize = 1024 * MegaByteSize
    TeraByteSize = 1024 * GigaByteSize
)

Byte unit value

const StringEmpty = ""

StringEmpty is empty string constant. Using `ess.StringEmpty` instead of "".

Variables

var (
    // FmtFlagSeparator is used parse flags pattern.
    FmtFlagSeparator = "%"

    // FmtFlagValueSeparator is used to parse into flag and value.
    FmtFlagValueSeparator = ":"
)
var (
    ErrGoPathIsNotSet = errors.New("GOPATH environment variable is not set. " +
        "Please refer to https://golang.org/doc/code.html to configure your Go environment")

    ErrDirNotInGoPath = errors.New("current directory is outside of GOPATH")
)

Required variables

var ErrBase64Decode = errors.New("encoding/base64: decode error")

ErrBase64Decode returned when given string unable to do base64 decode.

var Version = "0.8.0"

Version no. of essentials library

func ApplyFileMode Uses

func ApplyFileMode(target string, mode os.FileMode) error

ApplyFileMode applies the given file mode to the target{file|directory}

func CloseQuietly Uses

func CloseQuietly(c ...interface{})

CloseQuietly closes `io.Closer` quietly. Very handy, where you do not care about error while `Close()` and helpful for code quality too.

func CopyDir Uses

func CopyDir(dest, src string, excludes Excludes) error

CopyDir copies entire directory, sub directories and files into destination and it excludes give file matches

func CopyFile Uses

func CopyFile(dest, src string) (int64, error)

CopyFile copies the given source file into destination

func DecodeBase64 Uses

func DecodeBase64(v []byte) ([]byte, error)

DecodeBase64 method decodes given base64 into bytes. Reference: https://github.com/golang/go/blob/master/src/encoding/base64/base64.go#L384

func DeleteFiles Uses

func DeleteFiles(files ...string) (errs []error)

DeleteFiles method deletes give files or directories. ensure your supplying appropriate paths.

func DirsPath Uses

func DirsPath(basePath string, recursive bool) (pdirs []string, err error)

DirsPath method returns all directories absolute path from given base path recursively.

func DirsPathExcludes Uses

func DirsPathExcludes(basePath string, recursive bool, excludes Excludes) (pdirs []string, err error)

DirsPathExcludes method returns all directories absolute path from given base path recursively excluding the excludes list.

func EncodeToBase64 Uses

func EncodeToBase64(v []byte) []byte

EncodeToBase64 method encodes given bytes into base64 bytes. Reference: https://github.com/golang/go/blob/master/src/encoding/base64/base64.go#L169

func FilesPath Uses

func FilesPath(basePath string, recursive bool) (files []string, err error)

FilesPath method returns all files absolute path from given base path recursively.

func FilesPathExcludes Uses

func FilesPathExcludes(basePath string, recursive bool, excludes Excludes) (files []string, err error)

FilesPathExcludes method returns all files absolute path from given base path recursively excluding the excludes list.

func GenerateRandomKey Uses

func GenerateRandomKey(length int) []byte

GenerateRandomKey method generates the random bytes for given length using `math/rand.Source` and byte mask. StackOverflow Ref - http://stackoverflow.com/a/31832326

func GenerateSecureRandomKey Uses

func GenerateSecureRandomKey(length int) []byte

GenerateSecureRandomKey method generates the random bytes for given length using `crypto/rand`.

func GoPath Uses

func GoPath() (string, error)

GoPath returns GOPATH in context with current working directory otherwise it returns first directory from GOPATH

func IsAbsURL Uses

func IsAbsURL(rawurl string) bool

IsAbsURL method returns true if given raw URL is absolute URL otherwise false.

func IsDir Uses

func IsDir(path string) bool

IsDir returns true if the given `path` is directory otherwise returns false. Also returns false if path is not exists

func IsDirEmpty Uses

func IsDirEmpty(path string) bool

IsDirEmpty returns true if the given directory is empty also returns true if directory not exists. Otherwise returns false

func IsFileExists Uses

func IsFileExists(filename string) bool

IsFileExists return true is file or directory is exists, otherwise returns false. It also take cares of symlink path as well

func IsImportPathExists Uses

func IsImportPathExists(path string) bool

IsImportPathExists returns true if import path found in the GOPATH otherwise returns false

func IsInGoRoot Uses

func IsInGoRoot(path string) bool

IsInGoRoot returns true if given path has prefix of GOROOT otherwise false

func IsRelativeURL Uses

func IsRelativeURL(rawurl string) bool

IsRelativeURL method returns true if given raw URL is relative URL otherwise false.

func IsSliceContainsString Uses

func IsSliceContainsString(strSlice []string, search string) bool

IsSliceContainsString method checks given string in the slice if found returns true otherwise false.

func IsStrEmpty Uses

func IsStrEmpty(v string) bool

IsStrEmpty returns true if strings is empty otherwise false

func IsVaildURL Uses

func IsVaildURL(rawurl string) bool

IsVaildURL method returns true if given raw URL gets parsed without any errors otherwise false.

func LineCnt Uses

func LineCnt(fileName string) int

LineCnt counts no. of lines on file

func LineCntr Uses

func LineCntr(r io.Reader) int

LineCntr counts no. of lines for given reader

func LookExecutable Uses

func LookExecutable(name string) bool

LookExecutable looks for an executable binary named file in the directories named by the PATH environment variable.

func MkDirAll Uses

func MkDirAll(path string, mode os.FileMode) error

MkDirAll method creates nested directories with given permission if not exists

func NewGUID Uses

func NewGUID() string

NewGUID method returns a new Globally Unique Identifier (GUID).

The 12-byte `UniqueId` consists of-

- 4-byte value representing the seconds since the Unix epoch,
- 3-byte machine identifier,
- 2-byte process id, and
- 3-byte counter, starting with a random value.

Uses Mongo Object ID algorithm to generate globally unique ids - https://docs.mongodb.com/manual/reference/method/ObjectId/

func RandomString Uses

func RandomString(length int) string

RandomString method generates the random string for given length using `math/rand.Source` and byte mask.

func SecureRandomString Uses

func SecureRandomString(length int) string

SecureRandomString method generates the random string for given length using `crypto/rand`.

func StrToBytes Uses

func StrToBytes(value string) (int64, error)

StrToBytes method returns bytes value for given string value.

For e.g.:
  2mb ==> 2097152 bytes
  2MB ==> 2097152 bytes
  2MiB ==> 2097152 bytes

func StripExt Uses

func StripExt(name string) string

StripExt method returns name of the file without extension.

E.g.: index.html => index

func Walk Uses

func Walk(srcDir string, walkFn filepath.WalkFunc) error

Walk method extends filepath.Walk to also follows symlinks. Always returns the path of the file or directory also path is inline to name of symlink

func Zip Uses

func Zip(dest, src string) error

Zip method creates zip archive for given file or directory.

type CallerInfo Uses

type CallerInfo struct {
    QualifiedName string
    FunctionName  string
    FileName      string
    File          string
    Line          int
}

CallerInfo struct stores Go caller info

func GetCallerInfo Uses

func GetCallerInfo() *CallerInfo

GetCallerInfo method returns caller's QualifiedName, FunctionName, File, FileName, Line Number.

type Excludes Uses

type Excludes []string

Excludes is handly filepath match manipulation

func (*Excludes) Match Uses

func (e *Excludes) Match(file string) bool

Match evalutes given file with available patterns returns true if matches otherwise false. `Match` internally uses the `filepath.Match`

Note: `Match` ignore pattern errors, use `Validate` method to ensure you have correct exclude patterns

func (*Excludes) Validate Uses

func (e *Excludes) Validate() error

Validate helps to evalute the pattern are valid `Match` method is from error and focus on match

type FmtFlag Uses

type FmtFlag uint8

FmtFlag type definition

type FmtFlagPart Uses

type FmtFlagPart struct {
    Flag   FmtFlag
    Name   string
    Format string
}

FmtFlagPart is indiviual flag details

For e.g.:
  part := FmtFlagPart{
    Flag:   FmtFlagTime,
    Name:   "time",
    Format: "2006-01-02 15:04:05.000",
  }

func ParseFmtFlag Uses

func ParseFmtFlag(pattern string, fmtFlags map[string]FmtFlag) ([]FmtFlagPart, error)

ParseFmtFlag it parses the given pattern, format flags into format flag parts.

For e.g.:
  %time:2006-01-02 15:04:05.000 %level:-5 %message
  %clientip %reqid %reqtime %restime %resstatus %ressize %reqmethod %requrl %reqhdr:Referer %reshdr:Server

type FunctionInfo Uses

type FunctionInfo struct {
    Name          string
    Package       string
    QualifiedName string
}

FunctionInfo structs Go function info

func GetFunctionInfo Uses

func GetFunctionInfo(f interface{}) (fi *FunctionInfo)

GetFunctionInfo method returns the function name for given interface value.

type Valuer Uses

type Valuer interface {
    Get(key string) interface{}
    Set(key string, value interface{})
}

Valuer interface is general purpose to `Set` and `Get` operations.

Package ess imports 25 packages (graph) and is imported by 23 packages. Updated 2018-06-22. Refresh now. Tools for package owners.