mirror of
https://github.com/tailscale/tailscale.git
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2b665c370c
This commit modifies the k8s proxy application configuration to include a new field named `ServerURL` which, when set, modifies the tailscale coordination server used by the proxy. This works in the same way as the operator and the proxies it deploys. If unset, the default coordination server is used. Updates https://github.com/tailscale/tailscale/issues/13358 Signed-off-by: David Bond <davidsbond93@gmail.com>
103 lines
3.3 KiB
Go
103 lines
3.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build !plan9
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// Package conf contains code to load, manipulate, and access config file
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// settings for k8s-proxy.
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package conf
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import (
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"encoding/json"
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"fmt"
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"os"
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"github.com/tailscale/hujson"
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"tailscale.com/types/opt"
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)
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const v1Alpha1 = "v1alpha1"
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// Config describes a config file.
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type Config struct {
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Path string // disk path of HuJSON
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Raw []byte // raw bytes from disk, in HuJSON form
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Std []byte // standardized JSON form
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Version string // "v1alpha1"
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// Parsed is the parsed config, converted from its on-disk version to the
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// latest known format.
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Parsed ConfigV1Alpha1
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}
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// VersionedConfig allows specifying config at the root of the object, or in
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// a versioned sub-object.
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// e.g. {"version": "v1alpha1", "authKey": "abc123"}
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// or {"version": "v1beta1", "a-beta-config": "a-beta-value", "v1alpha1": {"authKey": "abc123"}}
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type VersionedConfig struct {
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Version string `json:",omitempty"` // "v1alpha1"
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// Latest version of the config.
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*ConfigV1Alpha1
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// Backwards compatibility version(s) of the config. Fields and sub-fields
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// from here should only be added to, never changed in place.
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V1Alpha1 *ConfigV1Alpha1 `json:",omitempty"`
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// V1Beta1 *ConfigV1Beta1 `json:",omitempty"` // Not yet used.
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}
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type ConfigV1Alpha1 struct {
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AuthKey *string `json:",omitempty"` // Tailscale auth key to use.
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Hostname *string `json:",omitempty"` // Tailscale device hostname.
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State *string `json:",omitempty"` // Path to the Tailscale state.
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LogLevel *string `json:",omitempty"` // "debug", "info". Defaults to "info".
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App *string `json:",omitempty"` // e.g. kubetypes.AppProxyGroupKubeAPIServer
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KubeAPIServer *KubeAPIServer `json:",omitempty"` // Config specific to the API Server proxy.
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ServerURL *string `json:",omitempty"` // URL of the Tailscale coordination server.
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}
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type KubeAPIServer struct {
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AuthMode opt.Bool `json:",omitempty"`
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}
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// Load reads and parses the config file at the provided path on disk.
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func Load(path string) (c Config, err error) {
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c.Path = path
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c.Raw, err = os.ReadFile(path)
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if err != nil {
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return c, fmt.Errorf("error reading config file %q: %w", path, err)
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}
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c.Std, err = hujson.Standardize(c.Raw)
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if err != nil {
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return c, fmt.Errorf("error parsing config file %q HuJSON/JSON: %w", path, err)
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}
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var ver VersionedConfig
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if err := json.Unmarshal(c.Std, &ver); err != nil {
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return c, fmt.Errorf("error parsing config file %q: %w", path, err)
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}
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rootV1Alpha1 := (ver.Version == v1Alpha1)
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backCompatV1Alpha1 := (ver.V1Alpha1 != nil)
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switch {
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case ver.Version == "":
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return c, fmt.Errorf("error parsing config file %q: no \"version\" field provided", path)
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case rootV1Alpha1 && backCompatV1Alpha1:
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// Exactly one of these should be set.
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return c, fmt.Errorf("error parsing config file %q: both root and v1alpha1 config provided", path)
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case rootV1Alpha1 != backCompatV1Alpha1:
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c.Version = v1Alpha1
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switch {
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case rootV1Alpha1 && ver.ConfigV1Alpha1 != nil:
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c.Parsed = *ver.ConfigV1Alpha1
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case backCompatV1Alpha1:
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c.Parsed = *ver.V1Alpha1
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default:
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c.Parsed = ConfigV1Alpha1{}
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}
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default:
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return c, fmt.Errorf("error parsing config file %q: unsupported \"version\" value %q; want \"%s\"", path, ver.Version, v1Alpha1)
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}
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return c, nil
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}
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