mirror of
https://github.com/ipfs/kubo.git
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128 lines
2.5 KiB
Go
128 lines
2.5 KiB
Go
package util
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import (
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"errors"
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"io"
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"math/rand"
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"os"
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"path/filepath"
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"strings"
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"time"
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ds "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/datastore.go"
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)
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func init() {
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SetupLogging()
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}
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// Debug is a global flag for debugging.
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var Debug bool
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// ErrNotImplemented signifies a function has not been implemented yet.
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var ErrNotImplemented = errors.New("Error: not implemented yet.")
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// ErrTimeout implies that a timeout has been triggered
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var ErrTimeout = errors.New("Error: Call timed out.")
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// ErrSeErrSearchIncomplete implies that a search type operation didnt
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// find the expected node, but did find 'a' node.
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var ErrSearchIncomplete = errors.New("Error: Search Incomplete.")
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// ErrNotFound is returned when a search fails to find anything
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var ErrNotFound = ds.ErrNotFound
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// TildeExpansion expands a filename, which may begin with a tilde.
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func TildeExpansion(filename string) (string, error) {
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if strings.HasPrefix(filename, "~/") {
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filename = strings.Replace(filename, "~", os.Getenv("HOME"), 1)
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}
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return filename, nil
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}
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// ExpandPathnames takes a set of paths and turns them into absolute paths
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func ExpandPathnames(paths []string) ([]string, error) {
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var out []string
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for _, p := range paths {
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abspath, err := filepath.Abs(p)
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if err != nil {
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return nil, err
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}
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out = append(out, abspath)
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}
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return out, nil
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}
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// byteChanReader wraps a byte chan in a reader
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type byteChanReader struct {
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in chan []byte
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buf []byte
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}
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func NewByteChanReader(in chan []byte) io.Reader {
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return &byteChanReader{in: in}
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}
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func (bcr *byteChanReader) Read(b []byte) (int, error) {
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if len(bcr.buf) == 0 {
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data, ok := <-bcr.in
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if !ok {
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return 0, io.EOF
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}
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bcr.buf = data
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}
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if len(bcr.buf) >= len(b) {
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copy(b, bcr.buf)
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bcr.buf = bcr.buf[len(b):]
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return len(b), nil
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}
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copy(b, bcr.buf)
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b = b[len(bcr.buf):]
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totread := len(bcr.buf)
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for data := range bcr.in {
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if len(data) > len(b) {
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totread += len(b)
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copy(b, data[:len(b)])
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bcr.buf = data[len(b):]
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return totread, nil
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}
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copy(b, data)
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totread += len(data)
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b = b[len(data):]
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if len(b) == 0 {
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return totread, nil
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}
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}
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return totread, io.EOF
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}
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type randGen struct {
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src rand.Source
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}
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func NewFastRand() io.Reader {
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return &randGen{rand.NewSource(time.Now().UnixNano())}
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}
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func (r *randGen) Read(p []byte) (n int, err error) {
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todo := len(p)
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offset := 0
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for {
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val := int64(r.src.Int63())
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for i := 0; i < 8; i++ {
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p[offset] = byte(val & 0xff)
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todo--
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if todo == 0 {
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return len(p), nil
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}
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offset++
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val >>= 8
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}
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}
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panic("unreachable")
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}
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