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proxy.go
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proxy.go
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package proxy
import (
"bytes"
"crypto/tls"
"net/url"
"strings"
"sync"
"time"
"github.com/gofiber/fiber/v2"
"github.com/gofiber/fiber/v2/log"
"github.com/gofiber/fiber/v2/utils"
"github.com/valyala/fasthttp"
)
// New is deprecated
func New(config Config) fiber.Handler {
log.Warn("[PROXY] proxy.New is deprecated, please use proxy.Balancer instead")
return Balancer(config)
}
// Balancer creates a load balancer among multiple upstream servers
func Balancer(config Config) fiber.Handler {
// Set default config
cfg := configDefault(config)
// Load balanced client
lbc := &fasthttp.LBClient{}
// Note that Servers, Timeout, WriteBufferSize, ReadBufferSize and TlsConfig
// will not be used if the client are set.
if config.Client == nil {
// Set timeout
lbc.Timeout = cfg.Timeout
// Scheme must be provided, falls back to http
for _, server := range cfg.Servers {
if !strings.HasPrefix(server, "http") {
server = "http://" + server
}
u, err := url.Parse(server)
if err != nil {
panic(err)
}
client := &fasthttp.HostClient{
NoDefaultUserAgentHeader: true,
DisablePathNormalizing: true,
Addr: u.Host,
ReadBufferSize: config.ReadBufferSize,
WriteBufferSize: config.WriteBufferSize,
TLSConfig: config.TlsConfig,
}
lbc.Clients = append(lbc.Clients, client)
}
} else {
// Set custom client
lbc = config.Client
}
// Return new handler
return func(c *fiber.Ctx) error {
// Don't execute middleware if Next returns true
if cfg.Next != nil && cfg.Next(c) {
return c.Next()
}
// Set request and response
req := c.Request()
res := c.Response()
// Don't proxy "Connection" header
req.Header.Del(fiber.HeaderConnection)
// Modify request
if cfg.ModifyRequest != nil {
if err := cfg.ModifyRequest(c); err != nil {
return err
}
}
req.SetRequestURI(utils.UnsafeString(req.RequestURI()))
// Forward request
if err := lbc.Do(req, res); err != nil {
return err
}
// Don't proxy "Connection" header
res.Header.Del(fiber.HeaderConnection)
// Modify response
if cfg.ModifyResponse != nil {
if err := cfg.ModifyResponse(c); err != nil {
return err
}
}
// Return nil to end proxying if no error
return nil
}
}
var client = &fasthttp.Client{
NoDefaultUserAgentHeader: true,
DisablePathNormalizing: true,
}
var lock sync.RWMutex
// WithTlsConfig update http client with a user specified tls.config
// This function should be called before Do and Forward.
// Deprecated: use WithClient instead.
//
//nolint:stylecheck,revive // TODO: Rename to "WithTLSConfig" in v3
func WithTlsConfig(tlsConfig *tls.Config) {
client.TLSConfig = tlsConfig
}
// WithClient sets the global proxy client.
// This function should be called before Do and Forward.
func WithClient(cli *fasthttp.Client) {
lock.Lock()
defer lock.Unlock()
client = cli
}
// Forward performs the given http request and fills the given http response.
// This method will return an fiber.Handler
func Forward(addr string, clients ...*fasthttp.Client) fiber.Handler {
return func(c *fiber.Ctx) error {
return Do(c, addr, clients...)
}
}
// Do performs the given http request and fills the given http response.
// This method can be used within a fiber.Handler
func Do(c *fiber.Ctx, addr string, clients ...*fasthttp.Client) error {
return doAction(c, addr, func(cli *fasthttp.Client, req *fasthttp.Request, resp *fasthttp.Response) error {
return cli.Do(req, resp)
}, clients...)
}
// DoRedirects performs the given http request and fills the given http response, following up to maxRedirectsCount redirects.
// When the redirect count exceeds maxRedirectsCount, ErrTooManyRedirects is returned.
// This method can be used within a fiber.Handler
func DoRedirects(c *fiber.Ctx, addr string, maxRedirectsCount int, clients ...*fasthttp.Client) error {
return doAction(c, addr, func(cli *fasthttp.Client, req *fasthttp.Request, resp *fasthttp.Response) error {
return cli.DoRedirects(req, resp, maxRedirectsCount)
}, clients...)
}
// DoDeadline performs the given request and waits for response until the given deadline.
// This method can be used within a fiber.Handler
func DoDeadline(c *fiber.Ctx, addr string, deadline time.Time, clients ...*fasthttp.Client) error {
return doAction(c, addr, func(cli *fasthttp.Client, req *fasthttp.Request, resp *fasthttp.Response) error {
return cli.DoDeadline(req, resp, deadline)
}, clients...)
}
// DoTimeout performs the given request and waits for response during the given timeout duration.
// This method can be used within a fiber.Handler
func DoTimeout(c *fiber.Ctx, addr string, timeout time.Duration, clients ...*fasthttp.Client) error {
return doAction(c, addr, func(cli *fasthttp.Client, req *fasthttp.Request, resp *fasthttp.Response) error {
return cli.DoTimeout(req, resp, timeout)
}, clients...)
}
func doAction(
c *fiber.Ctx,
addr string,
action func(cli *fasthttp.Client, req *fasthttp.Request, resp *fasthttp.Response) error,
clients ...*fasthttp.Client,
) error {
var cli *fasthttp.Client
// set local or global client
if len(clients) != 0 {
cli = clients[0]
} else {
lock.RLock()
cli = client
lock.RUnlock()
}
req := c.Request()
res := c.Response()
originalURL := utils.CopyString(c.OriginalURL())
defer req.SetRequestURI(originalURL)
copiedURL := utils.CopyString(addr)
req.SetRequestURI(copiedURL)
// NOTE: if req.isTLS is true, SetRequestURI keeps the scheme as https.
// Reference: https://github.com/gofiber/fiber/issues/1762
if scheme := getScheme(utils.UnsafeBytes(copiedURL)); len(scheme) > 0 {
req.URI().SetSchemeBytes(scheme)
}
req.Header.Del(fiber.HeaderConnection)
if err := action(cli, req, res); err != nil {
return err
}
res.Header.Del(fiber.HeaderConnection)
return nil
}
func getScheme(uri []byte) []byte {
i := bytes.IndexByte(uri, '/')
if i < 1 || uri[i-1] != ':' || i == len(uri)-1 || uri[i+1] != '/' {
return nil
}
return uri[:i-1]
}
// DomainForward performs an http request based on the given domain and populates the given http response.
// This method will return an fiber.Handler
func DomainForward(hostname, addr string, clients ...*fasthttp.Client) fiber.Handler {
return func(c *fiber.Ctx) error {
host := string(c.Request().Host())
if host == hostname {
return Do(c, addr+c.OriginalURL(), clients...)
}
return nil
}
}
type roundrobin struct {
sync.Mutex
current int
pool []string
}
// this method will return a string of addr server from list server.
func (r *roundrobin) get() string {
r.Lock()
defer r.Unlock()
if r.current >= len(r.pool) {
r.current %= len(r.pool)
}
result := r.pool[r.current]
r.current++
return result
}
// BalancerForward Forward performs the given http request with round robin algorithm to server and fills the given http response.
// This method will return an fiber.Handler
func BalancerForward(servers []string, clients ...*fasthttp.Client) fiber.Handler {
r := &roundrobin{
current: 0,
pool: servers,
}
return func(c *fiber.Ctx) error {
server := r.get()
if !strings.HasPrefix(server, "http") {
server = "http://" + server
}
c.Request().Header.Add("X-Real-IP", c.IP())
return Do(c, server+c.OriginalURL(), clients...)
}
}