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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package main
import (
"context"
"fmt"
"io"
"log"
"net/http"
)
type gocachedClient struct {
baseURL string // base URL of the cacher server, like "http://localhost:31364".
cl *http.Client // http.Client to use.
accessToken string // Bearer token to use in the Authorization header.
verbose bool
}
// drainAndClose reads and throws away a small bounded amount of data. This is a
// best-effort attempt to allow connection reuse; Go's HTTP/1 Transport won't
// reuse a TCP connection unless you fully consume HTTP responses.
func drainAndClose(body io.ReadCloser) {
io.CopyN(io.Discard, body, 4<<10)
body.Close()
}
func tryReadErrorMessage(res *http.Response) []byte {
msg, _ := io.ReadAll(io.LimitReader(res.Body, 4<<10))
return msg
}
func (c *gocachedClient) get(ctx context.Context, actionID string) (outputID string, resp *http.Response, err error) {
req, _ := http.NewRequestWithContext(ctx, "GET", c.baseURL+"/action/"+actionID, nil)
req.Header.Set("Want-Object", "1") // opt in to single roundtrip protocol
if c.accessToken != "" {
req.Header.Set("Authorization", "Bearer "+c.accessToken)
}
res, err := c.cl.Do(req)
if err != nil {
return "", nil, err
}
defer func() {
if resp == nil {
drainAndClose(res.Body)
}
}()
if res.StatusCode == http.StatusNotFound {
return "", nil, nil
}
if res.StatusCode != http.StatusOK {
msg := tryReadErrorMessage(res)
if c.verbose {
log.Printf("error GET /action/%s: %v, %s", actionID, res.Status, msg)
}
return "", nil, fmt.Errorf("unexpected GET /action/%s status %v", actionID, res.Status)
}
outputID = res.Header.Get("Go-Output-Id")
if outputID == "" {
return "", nil, fmt.Errorf("missing Go-Output-Id header in response")
}
if res.ContentLength == -1 {
return "", nil, fmt.Errorf("no Content-Length from server")
}
return outputID, res, nil
}
func (c *gocachedClient) put(ctx context.Context, actionID, outputID string, size int64, body io.Reader) error {
req, _ := http.NewRequestWithContext(ctx, "PUT", c.baseURL+"/"+actionID+"/"+outputID, body)
req.ContentLength = size
if c.accessToken != "" {
req.Header.Set("Authorization", "Bearer "+c.accessToken)
}
res, err := c.cl.Do(req)
if err != nil {
if c.verbose {
log.Printf("error PUT /%s/%s: %v", actionID, outputID, err)
}
return err
}
defer res.Body.Close()
if res.StatusCode != http.StatusNoContent {
msg := tryReadErrorMessage(res)
if c.verbose {
log.Printf("error PUT /%s/%s: %v, %s", actionID, outputID, res.Status, msg)
}
return fmt.Errorf("unexpected PUT /%s/%s status %v", actionID, outputID, res.Status)
}
return nil
}
func (c *gocachedClient) fetchStats() (string, error) {
req, _ := http.NewRequest("GET", c.baseURL+"/session/stats", nil)
req.Header.Set("Authorization", "Bearer "+c.accessToken)
resp, err := c.cl.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(b), nil
}
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