/
client.go
224 lines (189 loc) · 5.23 KB
/
client.go
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package xhttpclient
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net/http"
"net/textproto"
"time"
)
type XClient struct {
baseURL string
header http.Header
reqTimeout time.Duration
doer *http.Client
bodyCodecPool BodyCodec
}
func NewClient() *XClient {
return (&XClient{
header: make(http.Header),
doer: DefaultClient(),
}).
WithBodyCodecJSON()
}
func (xc *XClient) Clone() *XClient {
return &XClient{
baseURL: xc.baseURL,
header: xc.header.Clone(),
doer: xc.doer,
}
}
func (xc *XClient) WithBodyCodecJSON() *XClient {
return xc.WithBodyCodec(BodyCodecJSON)
}
func (xc *XClient) WithBodyCodec(bodyCodec BodyCodec) *XClient {
xc.bodyCodecPool = bodyCodec
return xc
}
func (xc *XClient) WithRequestTimeout(d time.Duration) *XClient {
xc.reqTimeout = d
return xc
}
func (xc *XClient) WithClient(c *http.Client) *XClient {
xc.doer = c
return xc
}
func (xc *XClient) BaseURL(baseURL string) *XClient {
xc.baseURL = baseURL
return xc
}
func (xc *XClient) Header(header http.Header) *XClient {
xc.header = header.Clone()
return xc
}
func (xc *XClient) SetHeader(key, value string) *XClient {
if xc.header == nil {
xc.header = make(http.Header)
}
xc.header.Set(key, value)
return xc
}
func (xc *XClient) AddHeader(key, value string) *XClient {
if xc.header == nil {
xc.header = make(http.Header)
}
xc.header.Add(key, value)
return xc
}
func (xc *XClient) SetBasicAuth(username, password string) *XClient {
return xc.SetHeader("Authorization", "Basic "+basicAuth(username, password))
}
func (xc *XClient) Do(successV, wrongV any, xReq *XRequestBuilder) (resp *http.Response, respBody []byte, err error) {
return xc.DoOnceWithBodyCodec(xc.bodyCodecPool, successV, wrongV, xReq)
}
func (xc *XClient) DoOnceWithBodyCodec(bodyCodec BodyCodec, successV, wrongV any, xReq *XRequestBuilder) (resp *http.Response, respBody []byte, err error) {
if successV == nil {
return nil, nil, errors.New("'successV' must not be nil")
}
var (
req *http.Request
cancel context.CancelFunc
bc = bodyCodec.Get()
)
defer bodyCodec.Put(bc)
req, resp, cancel, err = xc.do(bc, xReq)
if err != nil {
cancel()
return nil, nil, err
}
defer wrapCancelAndCloseRespBody(cancel, resp)()
if bc, ok := bc.(BodyCodecOnReceive); ok {
bc.OnReceive(req, resp)
}
if resp.StatusCode == http.StatusNoContent {
return resp, nil, nil
}
if respBody, err = io.ReadAll(resp.Body); err != nil {
return resp, nil, fmt.Errorf("copy response body: %w", err)
}
switch {
case isWrong(bc, resp):
if wrongV == nil {
return resp, respBody, wrapDecodeError(nil, resp)
}
if err := decodeWrong(bc, bytes.NewBuffer(respBody), wrongV); err != nil {
return resp, respBody, wrapDecodeError(err, resp)
}
case isSuccessful(bc, resp):
if err := bc.Decode(bytes.NewBuffer(respBody), successV); err != nil {
return resp, respBody, wrapDecodeError(err, resp)
}
default:
if wrongV == nil {
return resp, respBody, wrapDecodeError(nil, resp)
}
if err := bc.Decode(bytes.NewBuffer(respBody), wrongV); err != nil {
return resp, respBody, wrapDecodeError(err, resp)
}
}
return
}
func (xc *XClient) DoWithRaw(xReq *XRequestBuilder) (req *http.Request, resp *http.Response, cancel context.CancelFunc, err error) {
codec := xc.bodyCodecPool.Get()
defer xc.bodyCodecPool.Put(codec)
req, resp, cancel, err = xc.do(codec, xReq)
return req, resp, wrapCancelAndCloseRespBody(cancel, resp), err
}
func (xc *XClient) do(bc BodyCodec, xReq *XRequestBuilder) (req *http.Request, resp *http.Response, cancel context.CancelFunc, err error) {
xc.initXReq(xReq)
if req, cancel, err = xReq.build(bc); err != nil {
return
}
if bc, ok := bc.(BodyCodecOnSend); ok {
bc.OnSend(req)
}
if resp, err = xc.doer.Do(req); err != nil {
return
}
return
}
func (xc *XClient) initXReq(xReq *XRequestBuilder) {
xReq.baseURL = xc.baseURL
if xReq.timeout <= 0 {
xReq.timeout = xc.reqTimeout
}
cliHdrLen, reqHdrLen := len(xc.header), len(xReq.header)
switch {
case cliHdrLen == 0 && reqHdrLen == 0 || cliHdrLen == 0 && reqHdrLen != 0:
// no-op
case cliHdrLen != 0 && reqHdrLen == 0:
xReq.header = xc.header.Clone()
default: // cliHdrLen != 0 && reqHdrLen != 0
for cliHdrKey, vv := range xc.header {
k := textproto.CanonicalMIMEHeaderKey(cliHdrKey)
if _, ok := xReq.header[k]; ok {
continue
}
xReq.header[k] = vv
}
}
}
func isWrong(bc BodyCodec, resp *http.Response) bool {
condition, ok := bc.(BodyCodecResponseIsWrong)
if !ok {
return false
}
return condition.IsWrong(resp)
}
func decodeWrong(bc BodyCodec, r io.Reader, wrongV any) error {
bcDW, ok := bc.(BodyCodecDecodeWrong)
if !ok {
return bc.Decode(r, wrongV)
}
return bcDW.DecodeWrong(r, wrongV)
}
func isSuccessful(bc BodyCodec, resp *http.Response) bool {
if condition, ok := bc.(BodyCodecResponseIsSuccessful); ok {
return condition.IsSuccessful(resp)
} else {
return ResponseIsSuccessfulGTE200LTE299(resp)
}
}
func wrapDecodeError(err error, resp *http.Response) error {
if err != nil {
return fmt.Errorf("unexpected error: URL: %s (%d %s): %w", resp.Request.URL, resp.StatusCode, http.StatusText(resp.StatusCode), err)
}
return fmt.Errorf("unexpected error: URL: %s (%d %s)", resp.Request.URL, resp.StatusCode, http.StatusText(resp.StatusCode))
}