mirror of
https://github.com/ipfs/kubo.git
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113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
// package util implements various utility functions used within ipfs
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// that do not currently have a better place to live.
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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/go-datastore"
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"github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/mitchellh/go-homedir"
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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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// ErrNoSuchLogger is returned when the util pkg is asked for a non existant logger
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var ErrNoSuchLogger = errors.New("Error: No such logger")
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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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return homedir.Expand(filename)
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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(output []byte) (int, error) {
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remain := output
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remainLen := len(output)
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outputLen := 0
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more := false
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next := bcr.buf
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for {
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n := copy(remain, next)
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remainLen -= n
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outputLen += n
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if remainLen == 0 {
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bcr.buf = next[n:]
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return outputLen, nil
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}
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remain = remain[n:]
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next, more = <-bcr.in
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if !more {
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return outputLen, io.EOF
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}
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}
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}
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type randGen struct {
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rand.Rand
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}
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func NewTimeSeededRand() io.Reader {
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src := rand.NewSource(time.Now().UnixNano())
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return &randGen{
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Rand: *rand.New(src),
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}
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}
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func (r *randGen) Read(p []byte) (n int, err error) {
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for i := 0; i < len(p); i++ {
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p[i] = byte(r.Rand.Intn(255))
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}
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return len(p), nil
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}
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// GetenvBool is the way to check an env var as a boolean
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func GetenvBool(name string) bool {
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v := strings.ToLower(os.Getenv(name))
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return v == "true" || v == "t" || v == "1"
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}
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