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file.go
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file.go
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package utils
import (
"bufio"
"bytes"
"errors"
"fmt"
"github.com/paulmatencio/s3c/gLog"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
)
type Rf struct {
buf []byte
err error
}
func ReadFile(filename string) ([]byte , error) {
var (
data []byte
err error
)
if r,err := os.Open(filename); err == nil {
return ioutil.ReadAll(r)
}
return data,err
}
func ReadDirectory( dirname string, filter string) ([]string, error) {
var (
files []string
fname string
err error
)
if filesinfo, err := ioutil.ReadDir(dirname); err == nil {
for _,finfo:= range filesinfo {
fname = finfo.Name()
if len(filter) == 0 || strings.Contains(fname,filter) {
files = append(files, fname)
}
}
}
return files,err
}
func AsyncReadFiles(entries []string) []*Rf{
ch := make(chan *Rf)
files := []*Rf{}
treq := 0
for _, entry := range entries {
treq += 1
go func(entry string) {
buf, err := ReadFile(entry)
// fmt.Println(entry, len(buf))
ch <- &Rf{buf,err}
}(entry)
}
for {
select {
case r := <-ch:
files = append(files, r)
if len(files) == treq {
return files
}
case <-time.After(50 * time.Millisecond):
fmt.Printf("r")
}
}
return files
}
func Exist(path string) (bool) {
_, err := os.Stat(path)
if err == nil { return true }
return false
}
func ReadBuffer(filename string) (*bytes.Buffer, error) {
fp, e := os.Open(filename)
if e == nil {
defer fp.Close()
fi, e := fp.Stat()
var n int64
n = fi.Size() + bytes.MinRead
buf := make([]byte, 0, n)
buffer := bytes.NewBuffer(buf)
_, e = buffer.ReadFrom(fp)
return buffer, e
} else {
return nil, e
}
}
func ReadLines(filename string) error {
fp, err := os.Open(filename)
if err == nil {
defer fp.Close()
scanner := bufio.NewScanner(fp)
for scanner.Scan() {
fmt.Println(scanner.Text())
}
}
return err
}
// writeLines writes the lines to the given file.
func writeLines(lines []string, path string) error {
file, err := os.Create(path)
if err != nil {
return err
}
defer file.Close()
w := bufio.NewWriter(file)
for _, line := range lines {
fmt.Fprintln(w, line)
}
return w.Flush()
}
func ScanLines(scanner *bufio.Scanner, num int) ([]string, error) {
var (
k int = 0
err error
)
linea := make([]string, num, num*2)
stop := false
for !stop {
scanner.Scan()
eof := false
if text := scanner.Text(); len(text) > 0 {
linea[k] = text
k++
} else {
eof = true
}
err = scanner.Err()
if k >= num || eof || err != nil {
stop = true
}
}
return linea[0:k], err
}
func ScanAllLines(scanner *bufio.Scanner) ([]string, error) {
var (
err error
linea []string
)
stop := false
for !stop {
scanner.Scan()
eof := false
if text := scanner.Text(); len(text) > 0 {
linea = append(linea,text)
} else {
eof = true
}
err = scanner.Err()
if eof || err != nil {
stop = true
}
}
return linea, err
}
func Scanner(pathname string) ( scanner *bufio.Scanner, err error) {
if len(pathname) > 0 {
fp, err := os.Open(pathname)
if err == nil {
// defer fp.Close()
scanner = bufio.NewScanner(fp)
} else {
return nil, err
}
} else {
err = errors.New(pathname + " is empty")
}
return scanner, err
}
func WriteFile(filename string, buf []byte, mode os.FileMode) error {
var err error
if err = ioutil.WriteFile(filename, buf, mode); err != nil {
gLog.Warning.Printf("Err %v Writing %s",err, filename)
}
return err
}
func AsyncWriteFiles(entries []string, buf [][]byte, mode os.FileMode) []*Rf {
ch := make(chan *Rf)
resp := []*Rf{}
treq := 0
for k, entry := range entries {
treq += 1
go func(entry string) {
err := WriteFile(entry, buf[k], mode)
ch <- &Rf{nil,err}
}(entry)
}
for {
select {
case r := <-ch:
resp = append(resp, r)
if len(resp) == treq {
return resp
}
case <-time.After(50* time.Millisecond):
fmt.Printf("w")
}
}
return resp
}
func ListFile(root string) {
if err := filepath.Walk(root,visit); err != nil {
}
}
func visit(path string, fi os.FileInfo, err error) error {
var (
err1 error
matched bool
)
if matched,err1 = filepath.Match("*.conf",fi.Name()); err == nil {
gLog.Info.Println(path,matched)
}
return err1
}