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Refactor lfs requests (#26783) 

- Refactor lfs request code
- The original code uses `performRequest` function to create the
request, uses a callback to modify the request, and then send the
request.
- Now it's replaced with `createRequest` that only creates request and
`performRequest` that only sends the request.
- Reuse `createRequest` and `performRequest` in `http_client.go` and
`transferadapter.go`

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
This commit is contained in:
Chongyi Zheng 2023-09-18 04:40:50 -04:00 committed by GitHub
parent a50d9af876
commit 9631958a82
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 127 additions and 138 deletions
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12
modules/lfs/filesystem_client.go
View File

@ -15,7 +15,7 @@ import (
// FilesystemClient is used to read LFS data from a filesystem path
type FilesystemClient struct {
lfsdir string
lfsDir string
}
// BatchSize returns the preferred size of batchs to process
@ -25,16 +25,12 @@ func (c *FilesystemClient) BatchSize() int {
func newFilesystemClient(endpoint *url.URL) *FilesystemClient {
path, _ := util.FileURLToPath(endpoint)
lfsdir := filepath.Join(path, "lfs", "objects")
client := &FilesystemClient{lfsdir}
return client
lfsDir := filepath.Join(path, "lfs", "objects")
return &FilesystemClient{lfsDir}
}
func (c *FilesystemClient) objectPath(oid string) string {
return filepath.Join(c.lfsdir, oid[0:2], oid[2:4], oid)
return filepath.Join(c.lfsDir, oid[0:2], oid[2:4], oid)
}
// Download reads the specific LFS object from the target path

104
modules/lfs/http_client.go
View File

@ -8,6 +8,7 @@ import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"strings"
@ -17,7 +18,7 @@ import (
"code.gitea.io/gitea/modules/proxy"
)
const batchSize = 20
const httpBatchSize = 20
// HTTPClient is used to communicate with the LFS server
// https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md
@ -29,7 +30,7 @@ type HTTPClient struct {
// BatchSize returns the preferred size of batchs to process
func (c *HTTPClient) BatchSize() int {
return batchSize
return httpBatchSize
}
func newHTTPClient(endpoint *url.URL, httpTransport *http.Transport) *HTTPClient {
@ -43,28 +44,25 @@ func newHTTPClient(endpoint *url.URL, httpTransport *http.Transport) *HTTPClient
Transport: httpTransport,
}
client := &HTTPClient{
client: hc,
endpoint: strings.TrimSuffix(endpoint.String(), "/"),
transfers: make(map[string]TransferAdapter),
}
basic := &BasicTransferAdapter{hc}
client.transfers[basic.Name()] = basic
client := &HTTPClient{
client: hc,
endpoint: strings.TrimSuffix(endpoint.String(), "/"),
transfers: map[string]TransferAdapter{
basic.Name(): basic,
},
}
return client
}
func (c *HTTPClient) transferNames() []string {
keys := make([]string, len(c.transfers))
i := 0
for k := range c.transfers {
keys[i] = k
i++
}
return keys
}
@ -74,7 +72,6 @@ func (c *HTTPClient) batch(ctx context.Context, operation string, objects []Poin
url := fmt.Sprintf("%s/objects/batch", c.endpoint)
request := &BatchRequest{operation, c.transferNames(), nil, objects}
payload := new(bytes.Buffer)
err := json.NewEncoder(payload).Encode(request)
if err != nil {
@ -82,32 +79,17 @@ func (c *HTTPClient) batch(ctx context.Context, operation string, objects []Poin
return nil, err
}
log.Trace("Calling: %s", url)
req, err := http.NewRequestWithContext(ctx, "POST", url, payload)
req, err := createRequest(ctx, http.MethodPost, url, map[string]string{"Content-Type": MediaType}, payload)
if err != nil {
log.Error("Error creating request: %v", err)
return nil, err
}
req.Header.Set("Content-type", MediaType)
req.Header.Set("Accept", MediaType)
res, err := c.client.Do(req)
res, err := performRequest(ctx, c.client, req)
if err != nil {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
log.Error("Error while processing request: %v", err)
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("Unexpected server response: %s", res.Status)
}
var response BatchResponse
err = json.NewDecoder(res.Body).Decode(&response)
if err != nil {
@ -177,7 +159,7 @@ func (c *HTTPClient) performOperation(ctx context.Context, objects []Pointer, dc
link, ok := object.Actions["upload"]
if !ok {
log.Debug("%+v", object)
return errors.New("Missing action 'upload'")
return errors.New("missing action 'upload'")
}
content, err := uc(object.Pointer, nil)
@ -187,8 +169,6 @@ func (c *HTTPClient) performOperation(ctx context.Context, objects []Pointer, dc
err = transferAdapter.Upload(ctx, link, object.Pointer, content)
content.Close()
if err != nil {
return err
}
@ -203,7 +183,7 @@ func (c *HTTPClient) performOperation(ctx context.Context, objects []Pointer, dc
link, ok := object.Actions["download"]
if !ok {
log.Debug("%+v", object)
return errors.New("Missing action 'download'")
return errors.New("missing action 'download'")
}
content, err := transferAdapter.Download(ctx, link)
@ -219,3 +199,59 @@ func (c *HTTPClient) performOperation(ctx context.Context, objects []Pointer, dc
return nil
}
// createRequest creates a new request, and sets the headers.
func createRequest(ctx context.Context, method, url string, headers map[string]string, body io.Reader) (*http.Request, error) {
log.Trace("createRequest: %s", url)
req, err := http.NewRequestWithContext(ctx, method, url, body)
if err != nil {
log.Error("Error creating request: %v", err)
return nil, err
}
for key, value := range headers {
req.Header.Set(key, value)
}
req.Header.Set("Accept", MediaType)
return req, nil
}
// performRequest sends a request, optionally performs a callback on the request and returns the response.
// If the status code is 200, the response is returned, and it will contain a non-nil Body.
// Otherwise, it will return an error, and the Body will be nil or closed.
func performRequest(ctx context.Context, client *http.Client, req *http.Request) (*http.Response, error) {
log.Trace("performRequest: %s", req.URL)
res, err := client.Do(req)
if err != nil {
select {
case <-ctx.Done():
return res, ctx.Err()
default:
}
log.Error("Error while processing request: %v", err)
return res, err
}
if res.StatusCode != http.StatusOK {
defer res.Body.Close()
return res, handleErrorResponse(res)
}
return res, nil
}
func handleErrorResponse(resp *http.Response) error {
var er ErrorResponse
err := json.NewDecoder(resp.Body).Decode(&er)
if err != nil {
if err == io.EOF {
return io.ErrUnexpectedEOF
}
log.Error("Error decoding json: %v", err)
return err
}
log.Trace("ErrorResponse: %v", er)
return errors.New(er.Message)
}

36
modules/lfs/http_client_test.go
View File

@ -177,7 +177,7 @@ func TestHTTPClientDownload(t *testing.T) {
// case 0
{
endpoint: "https://status-not-ok.io",
expectederror: "Unexpected server response: ",
expectederror: io.ErrUnexpectedEOF.Error(),
},
// case 1
{
@ -207,7 +207,7 @@ func TestHTTPClientDownload(t *testing.T) {
// case 6
{
endpoint: "https://empty-actions-map.io",
expectederror: "Missing action 'download'",
expectederror: "missing action 'download'",
},
// case 7
{
@ -217,27 +217,28 @@ func TestHTTPClientDownload(t *testing.T) {
// case 8
{
endpoint: "https://upload-actions-map.io",
expectederror: "Missing action 'download'",
expectederror: "missing action 'download'",
},
// case 9
{
endpoint: "https://verify-actions-map.io",
expectederror: "Missing action 'download'",
expectederror: "missing action 'download'",
},
// case 10
{
endpoint: "https://unknown-actions-map.io",
expectederror: "Missing action 'download'",
expectederror: "missing action 'download'",
},
}
for n, c := range cases {
client := &HTTPClient{
client: hc,
endpoint: c.endpoint,
transfers: make(map[string]TransferAdapter),
client: hc,
endpoint: c.endpoint,
transfers: map[string]TransferAdapter{
"dummy": dummy,
},
}
client.transfers["dummy"] = dummy
err := client.Download(context.Background(), []Pointer{p}, func(p Pointer, content io.ReadCloser, objectError error) error {
if objectError != nil {
@ -284,7 +285,7 @@ func TestHTTPClientUpload(t *testing.T) {
// case 0
{
endpoint: "https://status-not-ok.io",
expectederror: "Unexpected server response: ",
expectederror: io.ErrUnexpectedEOF.Error(),
},
// case 1
{
@ -319,7 +320,7 @@ func TestHTTPClientUpload(t *testing.T) {
// case 7
{
endpoint: "https://download-actions-map.io",
expectederror: "Missing action 'upload'",
expectederror: "missing action 'upload'",
},
// case 8
{
@ -329,22 +330,23 @@ func TestHTTPClientUpload(t *testing.T) {
// case 9
{
endpoint: "https://verify-actions-map.io",
expectederror: "Missing action 'upload'",
expectederror: "missing action 'upload'",
},
// case 10
{
endpoint: "https://unknown-actions-map.io",
expectederror: "Missing action 'upload'",
expectederror: "missing action 'upload'",
},
}
for n, c := range cases {
client := &HTTPClient{
client: hc,
endpoint: c.endpoint,
transfers: make(map[string]TransferAdapter),
client: hc,
endpoint: c.endpoint,
transfers: map[string]TransferAdapter{
"dummy": dummy,
},
}
client.transfers["dummy"] = dummy
err := client.Upload(context.Background(), []Pointer{p}, func(p Pointer, objectError error) (io.ReadCloser, error) {
return io.NopCloser(new(bytes.Buffer)), objectError

4
modules/lfs/pointer.go
View File

@ -29,10 +29,10 @@ const (
var (
// ErrMissingPrefix occurs if the content lacks the LFS prefix
ErrMissingPrefix = errors.New("Content lacks the LFS prefix")
ErrMissingPrefix = errors.New("content lacks the LFS prefix")
// ErrInvalidStructure occurs if the content has an invalid structure
ErrInvalidStructure = errors.New("Content has an invalid structure")
ErrInvalidStructure = errors.New("content has an invalid structure")
// ErrInvalidOIDFormat occurs if the oid has an invalid format
ErrInvalidOIDFormat = errors.New("OID has an invalid format")

108
modules/lfs/transferadapter.go
View File

@ -6,8 +6,6 @@ package lfs
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net/http"
@ -15,7 +13,7 @@ import (
"code.gitea.io/gitea/modules/log"
)
// TransferAdapter represents an adapter for downloading/uploading LFS objects
// TransferAdapter represents an adapter for downloading/uploading LFS objects.
type TransferAdapter interface {
Name() string
Download(ctx context.Context, l *Link) (io.ReadCloser, error)
@ -23,41 +21,48 @@ type TransferAdapter interface {
Verify(ctx context.Context, l *Link, p Pointer) error
}
// BasicTransferAdapter implements the "basic" adapter
// BasicTransferAdapter implements the "basic" adapter.
type BasicTransferAdapter struct {
client *http.Client
}
// Name returns the name of the adapter
// Name returns the name of the adapter.
func (a *BasicTransferAdapter) Name() string {
return "basic"
}
// Download reads the download location and downloads the data
// Download reads the download location and downloads the data.
func (a *BasicTransferAdapter) Download(ctx context.Context, l *Link) (io.ReadCloser, error) {
resp, err := a.performRequest(ctx, "GET", l, nil, nil)
req, err := createRequest(ctx, http.MethodGet, l.Href, l.Header, nil)
if err != nil {
return nil, err
}
resp, err := performRequest(ctx, a.client, req)
if err != nil {
return nil, err
}
return resp.Body, nil
}
// Upload sends the content to the LFS server
// Upload sends the content to the LFS server.
func (a *BasicTransferAdapter) Upload(ctx context.Context, l *Link, p Pointer, r io.Reader) error {
_, err := a.performRequest(ctx, "PUT", l, r, func(req *http.Request) {
if len(req.Header.Get("Content-Type")) == 0 {
req.Header.Set("Content-Type", "application/octet-stream")
}
if req.Header.Get("Transfer-Encoding") == "chunked" {
req.TransferEncoding = []string{"chunked"}
}
req.ContentLength = p.Size
})
req, err := createRequest(ctx, http.MethodPut, l.Href, l.Header, r)
if err != nil {
return err
}
if req.Header.Get("Content-Type") == "" {
req.Header.Set("Content-Type", "application/octet-stream")
}
if req.Header.Get("Transfer-Encoding") == "chunked" {
req.TransferEncoding = []string{"chunked"}
}
req.ContentLength = p.Size
res, err := performRequest(ctx, a.client, req)
if err != nil {
return err
}
defer res.Body.Close()
return nil
}
@ -69,66 +74,15 @@ func (a *BasicTransferAdapter) Verify(ctx context.Context, l *Link, p Pointer) e
return err
}
_, err = a.performRequest(ctx, "POST", l, bytes.NewReader(b), func(req *http.Request) {
req.Header.Set("Content-Type", MediaType)
})
req, err := createRequest(ctx, http.MethodPost, l.Href, l.Header, bytes.NewReader(b))
if err != nil {
return err
}
req.Header.Set("Content-Type", MediaType)
res, err := performRequest(ctx, a.client, req)
if err != nil {
return err
}
defer res.Body.Close()
return nil
}
func (a *BasicTransferAdapter) performRequest(ctx context.Context, method string, l *Link, body io.Reader, callback func(*http.Request)) (*http.Response, error) {
log.Trace("Calling: %s %s", method, l.Href)
req, err := http.NewRequestWithContext(ctx, method, l.Href, body)
if err != nil {
log.Error("Error creating request: %v", err)
return nil, err
}
for key, value := range l.Header {
req.Header.Set(key, value)
}
req.Header.Set("Accept", MediaType)
if callback != nil {
callback(req)
}
res, err := a.client.Do(req)
if err != nil {
select {
case <-ctx.Done():
return res, ctx.Err()
default:
}
log.Error("Error while processing request: %v", err)
return res, err
}
if res.StatusCode != http.StatusOK {
return res, handleErrorResponse(res)
}
return res, nil
}
func handleErrorResponse(resp *http.Response) error {
defer resp.Body.Close()
er, err := decodeResponseError(resp.Body)
if err != nil {
return fmt.Errorf("Request failed with status %s", resp.Status)
}
log.Trace("ErrorRespone: %v", er)
return errors.New(er.Message)
}
func decodeResponseError(r io.Reader) (ErrorResponse, error) {
var er ErrorResponse
err := json.NewDecoder(r).Decode(&er)
if err != nil {
log.Error("Error decoding json: %v", err)
}
return er, err
}

1
modules/util/path.go
View File

@ -225,6 +225,7 @@ func isOSWindows() bool {
var driveLetterRegexp = regexp.MustCompile("/[A-Za-z]:/")
// FileURLToPath extracts the path information from a file://... url.
// It returns an error only if the URL is not a file URL.
func FileURLToPath(u *url.URL) (string, error) {
if u.Scheme != "file" {
return "", errors.New("URL scheme is not 'file': " + u.String())