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facade.go
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facade.go
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package http1
import (
"bufio"
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"net/http"
"net/url"
"regexp"
"strings"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/argoproj/argo-workflows/v3/util/flatten"
)
// Facade provides a adapter from GRPC interface, but uses HTTP to send the messages.
// Errors are extracted from message body and returned as GRPC status errors.
type Facade struct {
baseUrl string
authorization string
insecureSkipVerify bool
}
func NewFacade(baseUrl, authorization string, insecureSkipVerify bool) Facade {
return Facade{baseUrl, authorization, insecureSkipVerify}
}
func (h Facade) Get(in, out interface{}, path string) error {
return h.do(in, out, "GET", path)
}
func (h Facade) Put(in, out interface{}, path string) error {
return h.do(in, out, "PUT", path)
}
func (h Facade) Post(in, out interface{}, path string) error {
return h.do(in, out, "POST", path)
}
func (h Facade) Delete(in, out interface{}, path string) error {
return h.do(in, out, "DELETE", path)
}
func (h Facade) EventStreamReader(in interface{}, path string) (*bufio.Reader, error) {
method := "GET"
u, err := h.url(method, path, in)
if err != nil {
return nil, err
}
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return nil, err
}
req.Header.Set("Accept", "text/event-stream")
req.Header.Set("Authorization", h.authorization)
log.Debugf("curl -H 'Accept: text/event-stream' -H 'Authorization: ******' '%v'", u)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
err = errFromResponse(resp)
if err != nil {
return nil, err
}
return bufio.NewReader(resp.Body), nil
}
func (h Facade) do(in interface{}, out interface{}, method string, path string) error {
var data []byte
if method != "GET" {
var err error
data, err = json.Marshal(in)
if err != nil {
return err
}
}
u, err := h.url(method, path, in)
if err != nil {
return err
}
req, err := http.NewRequest(method, u.String(), bytes.NewReader(data))
if err != nil {
return err
}
req.Header.Set("Authorization", h.authorization)
log.Debugf("curl -X %s -H 'Authorization: ******' -d '%s' '%v'", method, string(data), u)
client := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: h.insecureSkipVerify,
},
},
}
resp, err := client.Do(req)
if err != nil {
return err
}
err = errFromResponse(resp)
if err != nil {
return err
}
if out != nil {
return json.NewDecoder(resp.Body).Decode(out)
} else {
return nil
}
}
func (h Facade) url(method, path string, in interface{}) (*url.URL, error) {
query := url.Values{}
for s, v := range flatten.Flatten(in) {
x := "{" + s + "}"
if strings.Contains(path, x) {
path = strings.Replace(path, x, v, 1)
} else if method == "GET" {
query.Set(s, v)
}
}
// remove any that were not provided
path = regexp.MustCompile("{[^}]*}").ReplaceAllString(path, "")
return url.Parse(h.baseUrl + path + "?" + query.Encode())
}
func errFromResponse(r *http.Response) error {
if r.StatusCode == http.StatusOK {
return nil
}
x := &struct {
Code codes.Code `json:"code"`
Message string `json:"message"`
}{}
if err := json.NewDecoder(r.Body).Decode(x); err == nil {
return status.Errorf(x.Code, x.Message)
}
return status.Error(codes.Internal, fmt.Sprintf(": %v", r))
}