75 lines
2.1 KiB
Go
75 lines
2.1 KiB
Go
// Copyright 2021 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package phttp
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import (
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"net/http"
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"os"
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"runtime"
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"golang.org/x/term"
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"k8s.io/apimachinery/pkg/util/net"
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"k8s.io/client-go/rest"
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"go.pinniped.dev/internal/httputil/roundtripper"
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)
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func warningWrapper(rt http.RoundTripper, handler rest.WarningHandler) http.RoundTripper {
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return roundtripper.WrapFunc(rt, func(req *http.Request) (*http.Response, error) {
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resp, err := rt.RoundTrip(req)
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handleWarnings(resp, handler)
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return resp, err
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})
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}
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func handleWarnings(resp *http.Response, handler rest.WarningHandler) {
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if resp == nil {
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return
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}
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warnings, _ := net.ParseWarningHeaders(resp.Header["Warning"]) // safe to ignore errors here
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for _, warning := range warnings {
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handler.HandleWarningHeader(warning.Code, warning.Agent, warning.Text) // client-go throws away the date
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}
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}
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func getWarningHandler() rest.WarningHandler {
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// the client-go rest.WarningHandlers all log warnings with non-empty message and code=299, agent is ignored
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// no deduplication or color output when running from a non-terminal such as a pod
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if isTerm := term.IsTerminal(int(os.Stderr.Fd())); !isTerm {
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return rest.WarningLogger{}
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}
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// deduplicate and attempt color warnings when running from a terminal
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return rest.NewWarningWriter(os.Stderr, rest.WarningWriterOptions{
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Deduplicate: true,
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Color: allowsColorOutput(),
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})
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}
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// allowsColorOutput returns true if the process environment indicates color output is supported and desired.
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// Copied from k8s.io/kubectl/pkg/util/term.AllowsColorOutput.
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func allowsColorOutput() bool {
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// https://en.wikipedia.org/wiki/Computer_terminal#Dumb_terminals
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if os.Getenv("TERM") == "dumb" {
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return false
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}
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// https://no-color.org/
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if _, nocolor := os.LookupEnv("NO_COLOR"); nocolor {
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return false
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}
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// On Windows WT_SESSION is set by the modern terminal component.
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// Older terminals have poor support for UTF-8, VT escape codes, etc.
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if runtime.GOOS == "windows" && os.Getenv("WT_SESSION") == "" {
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return false
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}
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return true
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}
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