forked from ligato/vpp-agent
/
http.go
250 lines (215 loc) · 6.82 KB
/
http.go
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package client
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"strings"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/ligato/vpp-agent/api/types"
)
// serverResponse is a wrapper for http API responses.
type serverResponse struct {
body io.ReadCloser
header http.Header
statusCode int
reqURL *url.URL
}
func (c *Client) get(ctx context.Context, path string, query url.Values, headers map[string][]string) (serverResponse, error) {
return c.sendRequest(ctx, "GET", path, query, nil, headers)
}
func (c *Client) post(ctx context.Context, path string, query url.Values, obj interface{}, headers map[string][]string) (serverResponse, error) {
body, headers, err := encodeBody(obj, headers)
if err != nil {
return serverResponse{}, err
}
return c.sendRequest(ctx, "POST", path, query, body, headers)
}
func (c *Client) put(ctx context.Context, path string, query url.Values, obj interface{}, headers map[string][]string) (serverResponse, error) {
body, headers, err := encodeBody(obj, headers)
if err != nil {
return serverResponse{}, err
}
return c.sendRequest(ctx, "PUT", path, query, body, headers)
}
type headers map[string][]string
func encodeBody(obj interface{}, headers headers) (io.Reader, headers, error) {
if obj == nil {
return nil, headers, nil
}
body, err := encodeData(obj)
if err != nil {
return nil, headers, err
}
if headers == nil {
headers = make(map[string][]string)
}
headers["Content-Type"] = []string{"application/json"}
return body, headers, nil
}
func (c *Client) buildRequest(method, path string, body io.Reader, headers headers) (*http.Request, error) {
expectedPayload := method == "POST" || method == "PUT"
if expectedPayload && body == nil {
body = bytes.NewReader([]byte{})
}
req, err := http.NewRequest(method, path, body)
if err != nil {
return nil, err
}
req = c.addHeaders(req, headers)
if c.proto == "unix" || c.proto == "npipe" {
// For local communications, it doesn't matter what the host is.
// We just need a valid and meaningful host name.
req.Host = "ligato-agent"
}
req.URL.Host = c.httpAddr
req.URL.Scheme = c.scheme
if expectedPayload && req.Header.Get("Content-Type") == "" {
req.Header.Set("Content-Type", "text/plain")
}
return req, nil
}
func (c *Client) sendRequest(ctx context.Context, method, path string, query url.Values, body io.Reader, headers headers) (serverResponse, error) {
req, err := c.buildRequest(method, c.getAPIPath(ctx, path, query), body, headers)
if err != nil {
return serverResponse{}, err
}
resp, err := c.doRequest(ctx, req)
if err != nil {
return resp, err
}
err = c.checkResponseErr(resp)
return resp, err
}
func (c *Client) doRequest(ctx context.Context, req *http.Request) (serverResponse, error) {
serverResp := serverResponse{statusCode: -1, reqURL: req.URL}
var (
err error
resp *http.Response
)
req = req.WithContext(ctx)
logrus.Debugf("=> sending http request: %s %s (%d bytes)", req.Method, req.URL, req.ContentLength)
defer func() {
if err != nil {
logrus.Debugf("<= http response ERROR: %v", err)
} else {
logrus.Debugf("<= http response (statusCode %v)", serverResp.statusCode)
}
}()
resp, err = c.httpClient.Do(req)
if err != nil {
if c.scheme != "https" && strings.Contains(err.Error(), "malformed HTTP response") {
return serverResp, fmt.Errorf("%v.\n* Are you trying to connect to a TLS-enabled daemon without TLS?", err)
}
if c.scheme == "https" && strings.Contains(err.Error(), "bad certificate") {
return serverResp, errors.Wrap(err, "The server probably has client authentication (--tlsverify) enabled. Please check your TLS client certification settings")
}
// Don't decorate context sentinel errors; users may be comparing to
// them directly.
switch err {
case context.Canceled, context.DeadlineExceeded:
return serverResp, err
}
if nErr, ok := err.(*url.Error); ok {
if nErr, ok := nErr.Err.(*net.OpError); ok {
if os.IsPermission(nErr.Err) {
return serverResp, errors.Wrapf(err, "Got permission denied while trying to connect to the agent socket at %v", c.host)
}
}
}
if err, ok := err.(net.Error); ok {
if err.Timeout() {
return serverResp, ErrorConnectionFailed(c.host)
}
if !err.Temporary() {
if strings.Contains(err.Error(), "connection refused") || strings.Contains(err.Error(), "dial unix") {
return serverResp, ErrorConnectionFailed(c.host)
}
}
}
return serverResp, errors.Wrap(err, "error during connect")
}
if resp != nil {
serverResp.statusCode = resp.StatusCode
serverResp.body = resp.Body
serverResp.header = resp.Header
}
return serverResp, nil
}
func (c *Client) checkResponseErr(serverResp serverResponse) error {
if serverResp.statusCode >= 200 && serverResp.statusCode < 400 {
return nil
}
var body []byte
var err error
if serverResp.body != nil {
bodyMax := 1 * 1024 * 1024 // 1 MiB
bodyR := &io.LimitedReader{
R: serverResp.body,
N: int64(bodyMax),
}
body, err = ioutil.ReadAll(bodyR)
if err != nil {
return err
}
if bodyR.N == 0 {
return fmt.Errorf("request returned %s with a message (> %d bytes) for API route and version %s, check if the server supports the requested API version",
http.StatusText(serverResp.statusCode), bodyMax, serverResp.reqURL)
}
}
if len(body) == 0 {
return fmt.Errorf("request returned %s for API route and version %s, check if the server supports the requested API version",
http.StatusText(serverResp.statusCode), serverResp.reqURL)
}
var ct string
if serverResp.header != nil {
ct = serverResp.header.Get("Content-Type")
}
var errorMessage string
if ct == "application/json" {
var errorResponse types.ErrorResponse
if err := json.Unmarshal(body, &errorResponse); err != nil {
return errors.Wrap(err, "Error reading JSON")
}
errorMessage = strings.TrimSpace(errorResponse.Message)
} else {
errorMessage = strings.TrimSpace(string(body))
}
return errors.Wrap(errors.New(errorMessage), "Error response from daemon")
}
func (c *Client) addHeaders(req *http.Request, headers headers) *http.Request {
// Add CLI Config's HTTP Headers BEFORE we set the client headers
// then the user can't change OUR headers
for k, v := range c.customHTTPHeaders {
req.Header.Set(k, v)
}
if headers != nil {
for k, v := range headers {
req.Header[k] = v
}
}
return req
}
func encodeData(data interface{}) (*bytes.Buffer, error) {
params := bytes.NewBuffer(nil)
if data != nil {
if err := json.NewEncoder(params).Encode(data); err != nil {
return nil, err
}
}
return params, nil
}
func ensureReaderClosed(response serverResponse) {
if response.body != nil {
// Drain up to 512 bytes and close the body to let the Transport reuse the connection
_, _ = io.CopyN(ioutil.Discard, response.body, 512)
_ = response.body.Close()
}
}