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config.go
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config.go
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// Copyright 2016 Qubit Ltd.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"net/http"
"net/http/httputil"
"os"
"time"
yaml "gopkg.in/yaml.v3"
)
type config struct {
Global struct {
}
Modules map[string]*moduleConfig
DefaultModule string `yaml:"defaultModule"`
XXX map[string]interface{} `yaml:",inline"`
bearerToken string
proxyPath string
telemetryPath string
}
type moduleConfig struct {
Method string `yaml:"method"`
Timeout time.Duration `yaml:"timeout"`
XXX map[string]interface{} `yaml:",inline"`
Exec execConfig `yaml:"exec"`
HTTP *httpConfig `yaml:"http"`
File fileConfig `yaml:"file"`
name string
}
type httpConfig struct {
Verify *bool `yaml:"verify"` // no default
ExtendLabels *bool `yaml:"extended_labels"` // false
ExtendLabelsPath *string `yaml:"extended_labels_path"` // no default
ExtendLabelsTargetURLIdentity *string `yaml:"extended_labels_target_url_identity"` // no default
TLSInsecureSkipVerify bool `yaml:"tls_insecure_skip_verify"` // false
TLSCertFile *string `yaml:"tls_cert_file"` // no default
TLSKeyFile *string `yaml:"tls_key_file"` // no default
TLSCACertFile *string `yaml:"tls_ca_cert_file"` // no default
Port int `yaml:"port"` // no default
Path string `yaml:"path"` // /metrics
Scheme string `yaml:"scheme"` // http
Address string `yaml:"address"` // 127.0.0.1
Headers map[string]string `yaml:"headers"` // no default
BasicAuthUsername string `yaml:"basic_auth_username"` // no default
BasicAuthPassword string `yaml:"basic_auth_password"` // no default
XXX map[string]interface{} `yaml:",inline"`
LabelExtendConfig *ExtendedLabelsConfig
tlsConfig *tls.Config
mcfg *moduleConfig
*httputil.ReverseProxy `json:"-"`
}
type ExtendedLabelsConfig struct {
Targets map[string]ExtendedLabelTarget `yaml:"targets"`
}
type ExtendedLabelTarget struct {
Labels []ExtendedLabel `yaml:"labels"`
}
type ExtendedLabel struct {
MatchLabelKey string `yaml:"label_key_name"`
MatchLabels []MatchLabel `yaml:"extended_labels"`
}
type MatchLabel struct {
MetricMatch *string `yaml:"metric_match"`
MatchLabelValues map[string]*LabelPairs `yaml:"match_label_key_values"`
DefaultLabelPairs map[string]string `yaml:"default_label_pairs"`
}
type LabelPairs struct {
LabelPair map[string]string `yaml:"label_pairs"`
}
func (ee ExtendedLabelTarget) getMatchKeys() []string {
var keys = make([]string, len(ee.Labels))
for _, key := range ee.Labels {
keys = append(keys, key.MatchLabelKey)
}
return keys
}
type execConfig struct {
Command string `yaml:"command"`
Args []string `yaml:"args"`
Env map[string]string `yaml:"env"`
XXX map[string]interface{} `yaml:",inline"`
mcfg *moduleConfig
}
type fileConfig struct {
Path string `yaml:"path"`
mcfg *moduleConfig
}
func readConfig(r io.Reader) (*config, error) {
buf := bytes.Buffer{}
io.Copy(&buf, r)
cfg := config{}
err := yaml.Unmarshal(buf.Bytes(), &cfg)
if len(cfg.XXX) != 0 {
return nil, fmt.Errorf("unknown configuration fields: %v", cfg.XXX)
}
for s := range cfg.Modules {
if merr := checkModuleConfig(s, cfg.Modules[s]); merr != nil {
return nil, fmt.Errorf("bad config for module %s, %w", s, merr)
}
}
return &cfg, err
}
func readModuleConfig(name string, r io.Reader) (*moduleConfig, error) {
buf := bytes.Buffer{}
io.Copy(&buf, r)
cfg := moduleConfig{}
err := yaml.Unmarshal(buf.Bytes(), &cfg)
if err != nil {
return nil, err
}
if err = checkModuleConfig(name, &cfg); err != nil {
return nil, err
}
return &cfg, nil
}
func checkModuleConfig(name string, cfg *moduleConfig) error {
if len(cfg.XXX) != 0 {
return fmt.Errorf("unknown module configuration fields: %v", cfg.XXX)
}
cfg.name = name
switch cfg.Method {
case "http":
if len(cfg.HTTP.XXX) != 0 {
return fmt.Errorf("unknown http module configuration fields: %v", cfg.HTTP.XXX)
}
if cfg.HTTP.Port == 0 {
return fmt.Errorf("module %v must have a non-zero port set", name)
}
if cfg.HTTP.Verify == nil {
v := true
cfg.HTTP.Verify = &v
}
if cfg.HTTP.ExtendLabels == nil {
v := false
cfg.HTTP.ExtendLabels = &v
}
if *cfg.HTTP.ExtendLabels && cfg.HTTP.ExtendLabelsPath != nil {
var err error
cfg.HTTP.LabelExtendConfig, err = cfg.HTTP.getExtendedLabelConfig()
if err != nil {
//fmt.Printf("err %s\n", err)
return err
}
// Setup watcher for the config file
watch(cfg)
}
if cfg.HTTP.Scheme == "" {
cfg.HTTP.Scheme = "http"
}
if cfg.HTTP.Path == "" {
cfg.HTTP.Path = "/metrics"
}
if cfg.HTTP.Address == "" {
cfg.HTTP.Address = "localhost"
}
tlsConfig, err := cfg.HTTP.getTLSConfig()
if err != nil {
return fmt.Errorf("could not create tls config, %w", err)
}
dirFunc, err := cfg.getReverseProxyDirectorFunc()
if err != nil {
return err
}
cfg.HTTP.tlsConfig = tlsConfig
cfg.HTTP.ReverseProxy = &httputil.ReverseProxy{
Transport: &http.Transport{TLSClientConfig: tlsConfig},
Director: dirFunc,
ErrorHandler: cfg.getReverseProxyErrorHandlerFunc(),
}
if *cfg.HTTP.Verify && !*cfg.HTTP.ExtendLabels {
cfg.HTTP.ReverseProxy.ModifyResponse = cfg.getReverseProxyModifyResponseFunc()
}
if *cfg.HTTP.ExtendLabels {
cfg.HTTP.ReverseProxy.ModifyResponse = cfg.getLabelExtendReverseProxyModifyResponseFunc()
}
case "exec":
if len(cfg.Exec.XXX) != 0 {
return fmt.Errorf("unknown exec module configuration fields: %v", cfg.Exec.XXX)
}
case "file":
if cfg.File.Path == "" {
return fmt.Errorf("path argument for file module is mandatory")
}
default:
return fmt.Errorf("unknown module method: %v", cfg.Method)
}
return nil
}
func (c httpConfig) getExtendedLabelConfig() (*ExtendedLabelsConfig, error) {
labelDataConfig, err := os.ReadFile(*c.ExtendLabelsPath)
if err != nil {
return nil, err
}
var config = ExtendedLabelsConfig{}
err = yaml.Unmarshal(labelDataConfig, &config)
if err != nil {
return nil, err
}
return &config, nil
}
func (c httpConfig) getTLSConfig() (*tls.Config, error) {
config := &tls.Config{
InsecureSkipVerify: c.TLSInsecureSkipVerify,
MinVersion: tls.VersionTLS12,
}
if c.TLSCACertFile != nil {
caCert, err := os.ReadFile(*c.TLSCACertFile)
if err != nil {
return nil, fmt.Errorf("could not read ca from %v, %w", *c.TLSCACertFile, err)
}
config.ClientCAs = x509.NewCertPool()
config.ClientCAs.AppendCertsFromPEM(caCert)
}
if c.TLSCertFile != nil && c.TLSKeyFile != nil {
cert, err := tls.LoadX509KeyPair(*c.TLSCertFile, *c.TLSKeyFile)
if err != nil {
return nil, fmt.Errorf("failed reading TLS credentials, %w", err)
}
config.Certificates = []tls.Certificate{cert}
}
return config, nil
}