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http_client.go
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http_client.go
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package kit
import (
"bytes"
"context"
"io"
"net/http"
"net/url"
"strconv"
"time"
"github.com/neoxelox/errors"
"github.com/neoxelox/kit/util"
)
const (
_HTTP_CLIENT_RETRY_DEDUP_SKIP_COUNT = 6
)
var (
ErrHTTPClientGeneric = errors.New("http client failed")
ErrHTTPClientTimedOut = errors.New("http client timed out")
ErrHTTPClientBadStatus = errors.New("http client bad status (%d)")
ErrHTTPClientRateLimited = errors.New("http client rate limited (%d)")
)
var (
_HTTP_CLIENT_DEFAULT_CONFIG = HTTPClientConfig{
BaseURL: nil,
Headers: nil,
RaiseForStatus: util.Pointer(false),
AllowedRedirects: util.Pointer(0),
DefaultRetry: &RetryConfig{
Attempts: 1,
InitialDelay: 0 * time.Second,
LimitDelay: 0 * time.Second,
Retriables: []error{},
},
}
)
type HTTPClientConfig struct {
Timeout time.Duration
BaseURL *string
Headers *map[string]string
RaiseForStatus *bool
AllowedRedirects *int
DefaultRetry *RetryConfig
}
type HTTPClient struct {
config HTTPClientConfig
observer *Observer
client *http.Client
}
func NewHTTPClient(observer *Observer, config HTTPClientConfig) *HTTPClient {
util.Merge(&config, _HTTP_CLIENT_DEFAULT_CONFIG)
client := &http.Client{
CheckRedirect: func(_ *http.Request, via []*http.Request) error {
if len(via) >= *config.AllowedRedirects {
return http.ErrUseLastResponse
}
return nil
},
Timeout: config.Timeout,
}
return &HTTPClient{
config: config,
observer: observer,
client: client,
}
}
func (self *HTTPClient) Request(
ctx context.Context, method string, url string,
body []byte, headers map[string]string, retry ...RetryConfig) (*http.Response, error) {
_retry := util.Optional(retry, *self.config.DefaultRetry)
if self.config.BaseURL != nil {
url = *self.config.BaseURL + url
}
var buffer io.Reader = nil
if len(body) > 0 {
buffer = bytes.NewReader(body)
}
request, err := http.NewRequestWithContext(ctx, method, url, buffer)
if err != nil {
return nil, ErrHTTPClientGeneric.Raise().Cause(err)
}
for header, value := range headers {
request.Header.Set(header, value)
}
return self._do(request, &_retry)
}
func (self *HTTPClient) Do(request *http.Request) (*http.Response, error) {
return self._do(request, self.config.DefaultRetry)
}
func (self *HTTPClient) _do(request *http.Request, retry *RetryConfig) (*http.Response, error) {
if self.config.Headers != nil {
for header, value := range *self.config.Headers {
request.Header.Set(header, value)
}
}
_, endTraceRequest := self.observer.TraceClientRequest(request.Context(), request)
defer endTraceRequest()
var response *http.Response
err := util.ExponentialRetry(
retry.Attempts, retry.InitialDelay,
retry.LimitDelay, retry.Retriables,
func(attempt int) error {
var err error // nolint:govet
response, err = self.client.Do(request) // nolint:bodyclose
if err != nil {
if urlErr, ok := err.(*url.Error); ok && urlErr.Timeout() {
return ErrHTTPClientTimedOut.Raise().
Skip(2 + _HTTP_CLIENT_RETRY_DEDUP_SKIP_COUNT).
Extra(map[string]any{"attempt": attempt, "timeout": self.config.Timeout}).
Cause(err)
}
return ErrHTTPClientGeneric.Raise().
Skip(2 + _HTTP_CLIENT_RETRY_DEDUP_SKIP_COUNT).
Extra(map[string]any{"attempt": attempt}).
Cause(err)
}
if response.StatusCode == 429 && *self.config.RaiseForStatus {
wait := int64(0)
if retryAfter := response.Header.Get("Retry-After"); len(retryAfter) > 0 {
wait, _ = strconv.ParseInt(retryAfter, 10, 0)
} else if retryOn := response.Header.Get("X-Rate-Limit-Reset"); len(retryOn) > 0 {
retryOnInt, _ := strconv.ParseInt(retryOn, 10, 0)
now := time.Now().Unix()
if retryOnInt > now {
wait = retryOnInt - now
} else {
wait = retryOnInt
}
}
response.Body.Close()
return ErrHTTPClientRateLimited.Raise(wait).
Skip(2 + _HTTP_CLIENT_RETRY_DEDUP_SKIP_COUNT).
Extra(map[string]any{"attempt": attempt, "status": response.StatusCode, "wait": wait})
}
if response.StatusCode >= 400 && response.StatusCode != 429 && *self.config.RaiseForStatus {
response.Body.Close()
return ErrHTTPClientBadStatus.Raise(response.StatusCode).
Skip(2 + _HTTP_CLIENT_RETRY_DEDUP_SKIP_COUNT).
Extra(map[string]any{"attempt": attempt, "status": response.StatusCode})
}
return nil
})
if err != nil {
return nil, err
}
return response, nil
}
func (self *HTTPClient) Close(ctx context.Context) error {
err := util.Deadline(ctx, func(exceeded <-chan struct{}) error {
// Don't log the normal closing messages because this HTTP client
// is expected to be embedded in other user's custom HTTP clients
self.client.CloseIdleConnections()
return nil
})
if err != nil {
if util.ErrDeadlineExceeded.Is(err) {
return ErrHTTPClientTimedOut.Raise().Cause(err)
}
return err
}
return nil
}