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request.go
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request.go
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package client
import (
"context"
"encoding/json"
"errors"
"io"
"net/http"
"strings"
"github.com/ipfs-cluster/ipfs-cluster/api"
"go.uber.org/multierr"
"go.opencensus.io/trace"
)
type responseDecoder func(d *json.Decoder) error
func (c *defaultClient) do(
ctx context.Context,
method, path string,
headers map[string]string,
body io.Reader,
obj interface{},
) error {
resp, err := c.doRequest(ctx, method, path, headers, body)
if err != nil {
return api.Error{Code: 0, Message: err.Error()}
}
return c.handleResponse(resp, obj)
}
func (c *defaultClient) doStream(
ctx context.Context,
method, path string,
headers map[string]string,
body io.Reader,
outHandler responseDecoder,
) error {
resp, err := c.doRequest(ctx, method, path, headers, body)
if err != nil {
return api.Error{Code: 0, Message: err.Error()}
}
return c.handleStreamResponse(resp, outHandler)
}
func (c *defaultClient) doRequest(
ctx context.Context,
method, path string,
headers map[string]string,
body io.Reader,
) (*http.Response, error) {
span := trace.FromContext(ctx)
span.AddAttributes(
trace.StringAttribute("method", method),
trace.StringAttribute("path", path),
)
defer span.End()
urlpath := c.net + "://" + c.hostname + "/" + strings.TrimPrefix(path, "/")
logger.Debugf("%s: %s", method, urlpath)
r, err := http.NewRequestWithContext(ctx, method, urlpath, body)
if err != nil {
return nil, err
}
if c.config.DisableKeepAlives {
r.Close = true
}
if c.config.Username != "" {
r.SetBasicAuth(c.config.Username, c.config.Password)
}
for k, v := range headers {
r.Header.Set(k, v)
}
if body != nil {
r.ContentLength = -1 // this lets go use "chunked".
}
r = r.WithContext(ctx)
return c.client.Do(r)
}
func (c *defaultClient) handleResponse(resp *http.Response, obj interface{}) error {
body, err := io.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return api.Error{Code: resp.StatusCode, Message: err.Error()}
}
logger.Debugf("Response body: %s", body)
switch {
case resp.StatusCode == http.StatusAccepted:
logger.Debug("Request accepted")
case resp.StatusCode == http.StatusNoContent:
logger.Debug("Request succeeded. Response has no content")
default:
if resp.StatusCode > 399 && resp.StatusCode < 600 {
var apiErr api.Error
err = json.Unmarshal(body, &apiErr)
if err != nil {
// not json. 404s etc.
return api.Error{
Code: resp.StatusCode,
Message: string(body),
}
}
return apiErr
}
err = json.Unmarshal(body, obj)
if err != nil {
return api.Error{
Code: resp.StatusCode,
Message: err.Error(),
}
}
}
return nil
}
func (c *defaultClient) handleStreamResponse(resp *http.Response, handler responseDecoder) error {
if resp.StatusCode > 399 && resp.StatusCode < 600 {
return c.handleResponse(resp, nil)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
return api.Error{
Code: resp.StatusCode,
Message: "expected streaming response with code 200/204",
}
}
dec := json.NewDecoder(resp.Body)
for {
err := handler(dec)
if err == io.EOF {
// we need to check trailers
break
}
if err != nil {
logger.Error(err)
return err
}
}
trailerErrs := resp.Trailer.Values("X-Stream-Error")
var err error
for _, trailerErr := range trailerErrs {
if trailerErr != "" {
err = multierr.Append(err, errors.New(trailerErr))
}
}
if err != nil {
return api.Error{
Code: 500,
Message: err.Error(),
}
}
return nil
}