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// Copyright (c) 2018-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package client
import (
"bytes"
"context"
"fmt"
"io"
"log"
"net/http"
"net/http/httptest"
"strconv"
"strings"
"sync"
"testing"
)
type inMemoryBuffer struct {
m sync.Mutex
buf []byte
}
func (f *inMemoryBuffer) WriteAt(p []byte, ofs int64) (n int, err error) {
f.m.Lock()
defer f.m.Unlock()
n = copy(f.buf[ofs:], p)
return
}
func (f *inMemoryBuffer) Bytes() []byte {
f.m.Lock()
defer f.m.Unlock()
return f.buf
}
type stdLogger struct{}
func (l *stdLogger) Log(v ...interface{}) {
log.Print(v...)
}
func (l *stdLogger) Logf(f string, v ...interface{}) {
log.Printf(f, v...)
}
func parseRangeHeader(t *testing.T, val string) (int64, int64) {
t.Helper()
if val == "" {
return 0, 0
}
var start, end int64
e := strings.SplitN(val, "=", 2)
byteRange := strings.Split(e[1], "-")
start, _ = strconv.ParseInt(byteRange[0], 10, 0)
end, _ = strconv.ParseInt(byteRange[1], 10, 0)
return start, end
}
const (
basicAuthUsername = "user"
basicAuthPassword = "password"
)
var (
testLogger = &stdLogger{}
creds = &basicCredentials{username: basicAuthUsername, password: basicAuthPassword}
)
func TestMultistreamDownloader(t *testing.T) {
const src = "123456789012345678901234567890"
size := int64(len(src))
defaultSpec := &Downloader{Concurrency: 10, PartSize: 3}
tests := []struct {
name string
size int64
spec *Downloader
expectErr bool
}{
{"Basic", size, defaultSpec, false},
{"WithoutSize", 0, defaultSpec, true},
{"SingleStream", size, &Downloader{Concurrency: 1, PartSize: 1}, false},
{"SingleStreamWithoutSize", 0, &Downloader{Concurrency: 1, PartSize: 1}, true},
{"ManyStreams", size, &Downloader{Concurrency: uint(size), PartSize: 1}, false},
{"ManyStreamsWithoutSize", 0, &Downloader{Concurrency: uint(size), PartSize: 1}, true},
}
for _, tt := range tests {
tt := tt
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
// Create test http server for serving "file"
srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
start, end := parseRangeHeader(t, r.Header.Get("Range"))
if username, password, ok := r.BasicAuth(); ok {
if got, want := username, basicAuthUsername; got != want {
t.Fatalf("unexpected basic auth username: got %v, want %v", got, want)
}
if got, want := password, basicAuthPassword; got != want {
t.Fatalf("unexpected basic auth password: got %v, want %v", got, want)
}
}
w.Header().Set("Content-Range", fmt.Sprintf("bytes %v-%v/%v", start, end+1, size))
w.Header().Set("Content-Length", fmt.Sprintf("%v", end-start+1))
w.WriteHeader(http.StatusPartialContent)
if _, err := io.Copy(w, bytes.NewReader([]byte(src[start:end+1]))); err != nil {
t.Fatalf("unexpected error writing http response: %v", err)
}
}))
defer srv.Close()
c, err := NewClient(&Config{BaseURL: srv.URL, Logger: testLogger})
if err != nil {
t.Fatalf("error initializing client: %v", err)
}
// Preallocate sink for downloaded file
dst := &inMemoryBuffer{buf: make([]byte, size)}
// Start download
err = c.multipartDownload(context.Background(), srv.URL, creds, dst, tt.size, tt.spec, &NoopProgressBar{})
if tt.expectErr && err == nil {
t.Fatal("unexpected success")
}
if !tt.expectErr && err != nil {
t.Fatalf("unexpected error: %v", err)
}
if err != nil {
return
}
// Compare results with expectations
if got, want := string(dst.Bytes()), src; got != want {
t.Fatalf("unexpected data: got %v, want %v", got, want)
}
})
}
}
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