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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package lfs
import (
"bytes"
"context"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
)
const batchSize = 20
// HTTPClient is used to communicate with the LFS server
// https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md
type HTTPClient struct {
client *http.Client
endpoint string
transfers map[string]TransferAdapter
}
// BatchSize returns the preferred size of batchs to process
func (c *HTTPClient) BatchSize() int {
return batchSize
}
func newHTTPClient(endpoint *url.URL) *HTTPClient {
hc := &http.Client{}
client := &HTTPClient{
client: hc,
endpoint: strings.TrimSuffix(endpoint.String(), "/"),
transfers: make(map[string]TransferAdapter),
}
basic := &BasicTransferAdapter{hc}
client.transfers[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
}
func (c *HTTPClient) batch(ctx context.Context, operation string, objects []Pointer) (*BatchResponse, error) {
log.Trace("BATCH operation with objects: %v", objects)
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 {
log.Error("Error encoding json: %v", err)
return nil, err
}
log.Trace("Calling: %s", url)
req, err := http.NewRequestWithContext(ctx, "POST", url, 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)
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 {
log.Error("Error decoding json: %v", err)
return nil, err
}
if len(response.Transfer) == 0 {
response.Transfer = "basic"
}
return &response, nil
}
// Download reads the specific LFS object from the LFS server
func (c *HTTPClient) Download(ctx context.Context, objects []Pointer, callback DownloadCallback) error {
return c.performOperation(ctx, objects, callback, nil)
}
// Upload sends the specific LFS object to the LFS server
func (c *HTTPClient) Upload(ctx context.Context, objects []Pointer, callback UploadCallback) error {
return c.performOperation(ctx, objects, nil, callback)
}
func (c *HTTPClient) performOperation(ctx context.Context, objects []Pointer, dc DownloadCallback, uc UploadCallback) error {
if len(objects) == 0 {
return nil
}
operation := "download"
if uc != nil {
operation = "upload"
}
result, err := c.batch(ctx, operation, objects)
if err != nil {
return err
}
transferAdapter, ok := c.transfers[result.Transfer]
if !ok {
return fmt.Errorf("TransferAdapter not found: %s", result.Transfer)
}
for _, object := range result.Objects {
if object.Error != nil {
objectError := errors.New(object.Error.Message)
log.Trace("Error on object %v: %v", object.Pointer, objectError)
if uc != nil {
if _, err := uc(object.Pointer, objectError); err != nil {
return err
}
} else {
if err := dc(object.Pointer, nil, objectError); err != nil {
return err
}
}
continue
}
if uc != nil {
if len(object.Actions) == 0 {
log.Trace("%v already present on server", object.Pointer)
continue
}
link, ok := object.Actions["upload"]
if !ok {
log.Debug("%+v", object)
return errors.New("Missing action 'upload'")
}
content, err := uc(object.Pointer, nil)
if err != nil {
return err
}
err = transferAdapter.Upload(ctx, link, object.Pointer, content)
content.Close()
if err != nil {
return err
}
link, ok = object.Actions["verify"]
if ok {
if err := transferAdapter.Verify(ctx, link, object.Pointer); err != nil {
return err
}
}
} else {
link, ok := object.Actions["download"]
if !ok {
log.Debug("%+v", object)
return errors.New("Missing action 'download'")
}
content, err := transferAdapter.Download(ctx, link)
if err != nil {
return err
}
if err := dc(object.Pointer, content, nil); err != nil {
return err
}
}
}
return nil
}
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