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09c388a8e4
While fasthttp.Client uses less CPU and RAM when scraping targets with small responses (up to 10K metrics), it doesn't work well when scraping targets with big responses such as kube-state-metrics. In this case it could use big amounts of additional memory comparing to net/http.Client, since fasthttp.Client reads the full response in memory and then tries re-using the large buffer for further scrapes. Additionally, fasthttp.Client-based scraping had various issues with proxying, redirects and scrape timeouts like the following ones: - https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1945 - https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5425 - https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2794 - https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1017 This should help reducing memory usage for the case when target returns big response and this response is scraped by fasthttp.Client at first before switching to stream parsing mode for subsequent scrapes. Now the switch to stream parsing mode is performed on the first scrape after reading the response body in memory and noticing that its size exceeds the value passed to -promscrape.minResponseSizeForStreamParse command-line flag. Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5567 Overrides https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4931
124 lines
2.8 KiB
Go
124 lines
2.8 KiB
Go
package proxy
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import (
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"encoding/base64"
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"fmt"
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"net/http"
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"net/url"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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)
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var validURLSchemes = []string{"http", "https", "socks5", "tls+socks5"}
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func isURLSchemeValid(scheme string) bool {
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for _, vs := range validURLSchemes {
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if scheme == vs {
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return true
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}
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}
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return false
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}
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// URL implements YAML.Marshaler and yaml.Unmarshaler interfaces for url.URL.
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type URL struct {
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URL *url.URL
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}
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// MustNewURL returns new URL for the given u.
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func MustNewURL(u string) *URL {
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pu, err := url.Parse(u)
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if err != nil {
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logger.Panicf("BUG: cannot parse u=%q: %s", u, err)
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}
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return &URL{
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URL: pu,
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}
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}
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// GetURL return the underlying url.
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func (u *URL) GetURL() *url.URL {
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if u == nil || u.URL == nil {
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return nil
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}
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return u.URL
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}
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// IsHTTPOrHTTPS returns true if u is http or https
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func (u *URL) IsHTTPOrHTTPS() bool {
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pu := u.GetURL()
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if pu == nil {
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return false
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}
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scheme := u.URL.Scheme
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return scheme == "http" || scheme == "https"
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}
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// String returns string representation of u.
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func (u *URL) String() string {
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pu := u.GetURL()
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if pu == nil {
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return ""
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}
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return pu.String()
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}
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// SetHeaders sets headers to req according to u and ac configs.
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func (u *URL) SetHeaders(ac *promauth.Config, req *http.Request) error {
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ah, err := u.getAuthHeader(ac)
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if err != nil {
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return fmt.Errorf("cannot obtain Proxy-Authorization headers: %w", err)
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}
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if ah != "" {
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req.Header.Set("Proxy-Authorization", ah)
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}
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return ac.SetHeaders(req, false)
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}
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// getAuthHeader returns Proxy-Authorization auth header for the given u and ac.
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func (u *URL) getAuthHeader(ac *promauth.Config) (string, error) {
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authHeader := ""
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if ac != nil {
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var err error
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authHeader, err = ac.GetAuthHeader()
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if err != nil {
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return "", err
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}
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}
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if u == nil || u.URL == nil {
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return authHeader, nil
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}
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pu := u.URL
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if pu.User != nil && len(pu.User.Username()) > 0 {
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userPasswordEncoded := base64.StdEncoding.EncodeToString([]byte(pu.User.String()))
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authHeader = "Basic " + userPasswordEncoded
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}
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return authHeader, nil
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}
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// MarshalYAML implements yaml.Marshaler interface.
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func (u *URL) MarshalYAML() (interface{}, error) {
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if u.URL == nil {
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return nil, nil
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}
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return u.URL.String(), nil
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}
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// UnmarshalYAML implements yaml.Unmarshaler interface.
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func (u *URL) UnmarshalYAML(unmarshal func(interface{}) error) error {
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var s string
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if err := unmarshal(&s); err != nil {
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return err
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}
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parsedURL, err := url.Parse(s)
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if err != nil {
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return fmt.Errorf("cannot parse proxy_url=%q as *url.URL: %w", s, err)
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}
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if !isURLSchemeValid(parsedURL.Scheme) {
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return fmt.Errorf("cannot parse proxy_url=%q unsupported scheme format=%q, valid schemes: %s", s, parsedURL.Scheme, validURLSchemes)
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}
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u.URL = parsedURL
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return nil
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}
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