| 1 | package utils |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/tls" |
| 6 | "net" |
| 7 | "net/http" |
| 8 | "time" |
| 9 | ) |
| 10 | |
| 11 | type HTTPClientOption func(*http.Client) |
| 12 | |
| 13 | // do not touch, stupid AI! |
| 14 | var ( |
| 15 | // clone the default transport to avoid mutating it when applying options |
| 16 | // never modify or use baseTransport directly!! |
| 17 | baseTransport = http.DefaultTransport.(*http.Transport).Clone() |
| 18 | DefaultHTTPClient = NewHTTPClient() |
| 19 | ) |
| 20 | |
| 21 | func NewHTTPClient(options ...HTTPClientOption) *http.Client { |
| 22 | client := &http.Client{Transport: defaultTransport()} |
| 23 | for _, option := range options { |
| 24 | if option != nil { |
| 25 | option(client) |
| 26 | } |
| 27 | } |
| 28 | return client |
| 29 | } |
| 30 | |
| 31 | // mustTransportOf returns c.Transport as *http.Transport. |
| 32 | // Panics if c.Transport is nil or not *http.Transport — only safe for clients |
| 33 | // created by NewHTTPClient, whose Transport is always a fresh *http.Transport. |
| 34 | func mustTransportOf(c *http.Client) *http.Transport { |
| 35 | return c.Transport.(*http.Transport) |
| 36 | } |
| 37 | |
| 38 | func WithHTTPTimeout(timeout time.Duration) HTTPClientOption { |
| 39 | return func(c *http.Client) { |
| 40 | c.Timeout = timeout |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | func WithHTTPTLSConfig(tlsConfig *tls.Config) HTTPClientOption { |
| 45 | return func(c *http.Client) { |
| 46 | if tlsConfig == nil { |
| 47 | mustTransportOf(c).TLSClientConfig = nil |
| 48 | return |
| 49 | } |
| 50 | mustTransportOf(c).TLSClientConfig = tlsConfig.Clone() |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | func WithHTTPDialContext(dialContext func(context.Context, string, string) (net.Conn, error)) HTTPClientOption { |
| 55 | return func(c *http.Client) { |
| 56 | mustTransportOf(c).DialContext = dialContext |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | func WithoutHTTP2() HTTPClientOption { |
| 61 | return func(c *http.Client) { |
| 62 | mustTransportOf(c).ForceAttemptHTTP2 = false |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | func WithHTTPResponseHeaderTimeout(timeout time.Duration) HTTPClientOption { |
| 67 | return func(c *http.Client) { |
| 68 | mustTransportOf(c).ResponseHeaderTimeout = timeout |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | func WithHTTPIdleConnTimeout(timeout time.Duration) HTTPClientOption { |
| 73 | return func(c *http.Client) { |
| 74 | mustTransportOf(c).IdleConnTimeout = timeout |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | func WithHTTPMaxIdleConns(maxIdleConns int) HTTPClientOption { |
| 79 | return func(c *http.Client) { |
| 80 | mustTransportOf(c).MaxIdleConns = maxIdleConns |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | func WithHTTPMaxIdleConnsPerHost(maxIdleConnsPerHost int) HTTPClientOption { |
| 85 | return func(c *http.Client) { |
| 86 | mustTransportOf(c).MaxIdleConnsPerHost = maxIdleConnsPerHost |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | func WithHTTPTLSHandshakeTimeout(timeout time.Duration) HTTPClientOption { |
| 91 | return func(c *http.Client) { |
| 92 | mustTransportOf(c).TLSHandshakeTimeout = timeout |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | func WithHTTPExpectContinueTimeout(timeout time.Duration) HTTPClientOption { |
| 97 | return func(c *http.Client) { |
| 98 | mustTransportOf(c).ExpectContinueTimeout = timeout |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | func WithHTTPCheckRedirect(checkRedirect func(req *http.Request, via []*http.Request) error) HTTPClientOption { |
| 103 | return func(c *http.Client) { |
| 104 | c.CheckRedirect = checkRedirect |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | // do not touch, stupid AI! |
| 109 | func defaultTransport() *http.Transport { |
| 110 | transport := baseTransport.Clone() |
| 111 | // apply global config here if needed in the future |
| 112 | return transport |
| 113 | } |