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http.go
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http.go
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// Package backend contains implementation of various backend providers.
/*
* Copyright (c) 2018-2022, NVIDIA CORPORATION. All rights reserved.
*/
package backend
import (
"context"
"fmt"
"io"
"net/http"
"strings"
"time"
"github.com/artashesbalabekyan/aistore/3rdparty/glog"
"github.com/artashesbalabekyan/aistore/api/apc"
"github.com/artashesbalabekyan/aistore/cluster"
"github.com/artashesbalabekyan/aistore/cluster/meta"
"github.com/artashesbalabekyan/aistore/cmn"
"github.com/artashesbalabekyan/aistore/cmn/cos"
"github.com/artashesbalabekyan/aistore/cmn/debug"
"github.com/artashesbalabekyan/aistore/fs"
)
type (
httpProvider struct {
t cluster.TargetPut
httpClient *http.Client
httpsClient *http.Client
}
)
// interface guard
var _ cluster.BackendProvider = (*httpProvider)(nil)
func NewHTTP(t cluster.TargetPut, config *cmn.Config) cluster.BackendProvider {
hp := &httpProvider{t: t}
hp.httpClient = cmn.NewClient(cmn.TransportArgs{
Timeout: config.Client.TimeoutLong.D(),
WriteBufferSize: config.Net.HTTP.WriteBufferSize,
ReadBufferSize: config.Net.HTTP.ReadBufferSize,
UseHTTPS: false,
SkipVerify: config.Net.HTTP.SkipVerify,
})
hp.httpsClient = cmn.NewClient(cmn.TransportArgs{
Timeout: config.Client.TimeoutLong.D(),
WriteBufferSize: config.Net.HTTP.WriteBufferSize,
ReadBufferSize: config.Net.HTTP.ReadBufferSize,
UseHTTPS: true,
SkipVerify: config.Net.HTTP.SkipVerify,
})
return hp
}
func (hp *httpProvider) client(u string) *http.Client {
if strings.HasPrefix(u, "https") {
return hp.httpsClient
}
return hp.httpClient
}
func (*httpProvider) Provider() string { return apc.HTTP }
func (*httpProvider) MaxPageSize() uint { return 10000 }
// TODO: can be done
func (hp *httpProvider) CreateBucket(*meta.Bck) (int, error) {
return http.StatusNotImplemented, cmn.NewErrNotImpl("create", hp.Provider()+" bucket")
}
func (hp *httpProvider) HeadBucket(ctx context.Context, bck *meta.Bck) (bckProps cos.StrKVs, errCode int, err error) {
// TODO: we should use `bck.RemoteBck()`.
origURL, err := getOriginalURL(ctx, bck, "")
if err != nil {
return nil, http.StatusBadRequest, err
}
if verbose {
glog.Infof("[head_bucket] original_url: %q", origURL)
}
// Contact the original URL - as long as we can make connection we assume it's good.
resp, err := hp.client(origURL).Head(origURL)
if err != nil {
return nil, http.StatusBadRequest, err
}
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("HEAD(%s) failed, status %d", origURL, resp.StatusCode)
return nil, resp.StatusCode, err
}
if resp.Header.Get(cos.HdrETag) == "" {
// TODO: improve validation
glog.Errorf("Warning: missing header %s (response header: %+v)", cos.HdrETag, resp.Header)
}
bckProps = make(cos.StrKVs)
bckProps[apc.HdrBackendProvider] = apc.HTTP
return
}
func (*httpProvider) ListObjects(*meta.Bck, *apc.LsoMsg, *cmn.LsoResult) (errCode int, err error) {
debug.Assert(false)
return
}
func (*httpProvider) ListBuckets(cmn.QueryBcks) (bcks cmn.Bcks, errCode int, err error) {
debug.Assert(false)
return
}
func getOriginalURL(ctx context.Context, bck *meta.Bck, objName string) (string, error) {
origURL, ok := ctx.Value(cos.CtxOriginalURL).(string)
if !ok || origURL == "" {
if bck.Props == nil {
return "", fmt.Errorf("failed to HEAD (%s): original_url is empty", bck)
}
origURL = bck.Props.Extra.HTTP.OrigURLBck
debug.Assert(origURL != "")
if objName != "" {
origURL = cos.JoinPath(origURL, objName) // see `cmn.URL2BckObj`
}
}
return origURL, nil
}
func (hp *httpProvider) HeadObj(ctx context.Context, lom *cluster.LOM) (oa *cmn.ObjAttrs, errCode int, err error) {
var (
h = cmn.BackendHelpers.HTTP
bck = lom.Bck() // TODO: This should be `cloudBck = lom.Bck().RemoteBck()`
)
origURL, err := getOriginalURL(ctx, bck, lom.ObjName)
debug.AssertNoErr(err)
if verbose {
glog.Infof("[head_object] original_url: %q", origURL)
}
resp, err := hp.client(origURL).Head(origURL)
if err != nil {
return nil, http.StatusBadRequest, err
}
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, resp.StatusCode, fmt.Errorf("error occurred: %v", resp.StatusCode)
}
oa = &cmn.ObjAttrs{}
oa.SetCustomKey(cmn.SourceObjMD, apc.HTTP)
if resp.ContentLength >= 0 {
oa.Size = resp.ContentLength
}
if v, ok := h.EncodeVersion(resp.Header.Get(cos.HdrETag)); ok {
oa.SetCustomKey(cmn.ETag, v)
}
if verbose {
glog.Infof("[head_object] %s", lom)
}
return
}
func (hp *httpProvider) GetObj(ctx context.Context, lom *cluster.LOM, owt cmn.OWT) (errCode int, err error) {
reader, _, errCode, err := hp.GetObjReader(ctx, lom)
if err != nil {
return errCode, err
}
params := cluster.AllocPutObjParams()
{
params.WorkTag = fs.WorkfileColdget
params.Reader = reader
params.OWT = owt
params.Atime = time.Now()
}
err = hp.t.PutObject(lom, params)
cluster.FreePutObjParams(params)
if err != nil {
return
}
if verbose {
glog.Infof("[get_object] %s", lom)
}
return
}
func (hp *httpProvider) GetObjReader(ctx context.Context, lom *cluster.LOM) (r io.ReadCloser, expectedCksm *cos.Cksum,
errCode int, err error) {
var (
h = cmn.BackendHelpers.HTTP
bck = lom.Bck() // TODO: This should be `cloudBck = lom.Bck().RemoteBck()`
)
origURL, err := getOriginalURL(ctx, bck, lom.ObjName)
debug.AssertNoErr(err)
if verbose {
glog.Infof("[HTTP CLOUD][GET] original_url: %q", origURL)
}
resp, err := hp.client(origURL).Get(origURL) //nolint:bodyclose // is closed by the caller
if err != nil {
return nil, nil, http.StatusInternalServerError, err
}
if resp.StatusCode != http.StatusOK {
return nil, nil, resp.StatusCode, fmt.Errorf("error occurred: %v", resp.StatusCode)
}
if verbose {
glog.Infof("[HTTP CLOUD][GET] success, size: %d", resp.ContentLength)
}
lom.SetCustomKey(cmn.SourceObjMD, apc.HTTP)
lom.SetCustomKey(cmn.OrigURLObjMD, origURL)
if v, ok := h.EncodeVersion(resp.Header.Get(cos.HdrETag)); ok {
lom.SetCustomKey(cmn.ETag, v)
}
setSize(ctx, resp.ContentLength)
return wrapReader(ctx, resp.Body), nil, 0, nil
}
func (*httpProvider) PutObj(io.ReadCloser, *cluster.LOM) (int, error) {
return http.StatusBadRequest, cmn.NewErrUnsupp("PUT", " objects => HTTP backend")
}
func (*httpProvider) DeleteObj(*cluster.LOM) (int, error) {
return http.StatusBadRequest, cmn.NewErrUnsupp("DELETE", " objects from HTTP backend")
}