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|
package steam
import (
"archive/tar"
"errors"
"fmt"
"io"
"net/url"
"os"
"path/filepath"
"strings"
"time"
)
// how often are we going to be updating our status information?
const updateEveryNBytes = 10 * 1024 * 1024 // 10mb
// ExtractSmart attempts to discover what kind of resource is behind uri
// and extract it appropriately. It may fail with E_BadURI.
//
// For example the following forms are accepted:
//
// ExtractSmart("http://127.0.0.1/some-archive")
// ExtractSmart("https://example.com/some-archive")
// ExtractSmart("file:///some/local/file/path/to/archive.tar")
// ExtractSmart("/direct/path/to/archive.tar")
// ExtractSmart("C:\Users\user\Downloads\archive.tar")
func (l *Library) ExtractSmart(uri string) (*Game, error) {
if strings.HasPrefix(uri, "http") {
_, err := url.Parse(uri)
if err == nil {
return l.ExtractHTTP(uri)
}
} else if strings.HasPrefix(uri, "file") {
u, err := url.Parse(uri)
if err == nil {
return l.ExtractFile(u.Path)
}
} else if _, err := os.Stat(uri); err == nil {
return l.ExtractFile(uri)
}
return nil, E_BadURI
}
// ExtractFile is a wrapper around Extract that handles an HTTP endpoint.
// this spawns an "extractFile" on the library. Status will be updated there
// as this goes along. Non fatal and fatal errors will be populated there
func (l *Library) ExtractFile(fn string) (*Game, error) {
g := &Game{}
j := newJob("extractFile", g)
defer j.done()
l.status.addJob(j)
fi, err := os.Stat(fn)
if err != nil {
j.addError(err)
return g, err
}
j.setSize(fi.Size())
fh, err := os.Open(fn)
if err != nil {
j.addError(err)
return g, err
}
return l.extractUpdate(j, g, fh)
}
// Extract will read a tarball from the io.Reader and install the game into
// the current library path. This offers no visibility into the progress,
// as it does not update the job status on the progress, though it will
// populate errors.
//
// Most callers will want to use ExtractHTTP or ExtractFile instead
func (l *Library) Extract(r io.Reader) (*Game, error) {
g := &Game{LibraryPath: l.folder}
j := newJob("extract", g)
defer j.done()
l.status.addJob(j)
return l.extractPrimitive(j, g, r)
}
// extractUpdate takes care of updating the job as it goes along at updateEveryNBytes
// it will be reported back to the Job's status.
func (l *Library) extractUpdate(j *Job, g *Game, rdr io.ReadCloser) (*Game, error) {
rdr, wrtr := io.Pipe()
go func() {
var err error
g, err = l.extractPrimitive(j, g, rdr)
if err != nil {
j.addError(fmt.Errorf("Installer: extracting %s", err))
}
// resp.Body.Close()
rdr.Close()
}()
var total int64
var err error
for {
var n int64
n, err = io.CopyN(wrtr, rdr, updateEveryNBytes)
if err == io.EOF {
break
} else if err != nil {
j.addError(fmt.Errorf(
"Error encountered read error: %w", err))
break
}
total += n
j.setTransferred(total)
// rate in bytes/sec
// rate := total / int64(time.Since(*j.StartTime()).Seconds())
rate := float64(total) / float64(time.Since(*j.StartTime()).Seconds())
estSize := j.GetSize()
if estSize == nil {
j.addError(errors.New("Expected an estimated size, got nil"))
continue
}
// remaining := *estSize - total
remaining := float64(*estSize - total)
j.setETA(time.Duration((remaining / rate) / 1000 / 1000 / 1000))
}
if err == io.EOF {
return g, nil
}
return g, err
}
func (l *Library) extractPrimitive(j *Job, g *Game, r io.Reader) (*Game, error) {
treader := tar.NewReader(r)
for {
hdr, err := treader.Next()
if err == io.EOF {
// We've reached the end! Whoee
break
}
if err != nil {
j.addError(err)
return nil, err
}
fileName := filepath.ToSlash(hdr.Name)
if g.Name == "" {
s := strings.Split(fileName, "/")
if len(s) >= 2 {
g.Name = s[1]
}
}
fileName = filepath.Join(l.folder, fileName)
info := hdr.FileInfo()
if info.IsDir() {
// I don't like hard-coded permissions but it
// it helps with overall platform compatibility
err = os.MkdirAll(fileName, defaultDirectoryMode)
if err != nil {
j.addError(err)
return nil, err
}
continue
}
err = os.MkdirAll(filepath.Dir(fileName), defaultDirectoryMode)
if err != nil {
j.addError(err)
return nil, err
}
// Create a file handle to work with
f, err := os.OpenFile(fileName, os.O_CREATE|os.O_TRUNC|os.O_WRONLY,
defaultFileMode)
if err != nil {
j.addError(err)
return nil, err
}
if _, err := io.Copy(f, treader); err != nil {
j.addError(err)
f.Close()
return nil, err
}
f.Close()
}
err := g.SetSizeInfo()
if err != nil {
j.addError(err)
return nil, err
}
l.m.Lock()
l.games[g.Name] = g
l.m.Unlock()
return g, nil
}
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