envoy

main.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"

	"gopkg.in/yaml.v2"
)

type Config struct {
	Services []Service `yaml:"services"`
	Hosts    []Host    `yaml:"hosts"`
}

type Service struct {
	Name    string `yaml:"name"`
	Address string `yaml:"address"`
	Type    string `yaml:"type"`
}

type RetryPolicy struct {
	RetryOn    string `yaml:"retryOn"` // https://www.envoyproxy.io/docs/envoy/latest/configuration/http_filters/router_filter#id4
	NumRetries uint32 `yaml:"numRetries"`
}

type Host struct {
	Name                  string      `yaml:"name"`
	Domains               []string    `yaml:"domains"`
	Routes                []Route     `yaml:"routes"`
	AddRequestHeaders     []Header    `yaml:"addRequestHeaders"`
	AddResponseHeaders    []Header    `yaml:"addResponseHeaders"`
	RemoveResponseHeaders []string    `yaml:"removeResponseHeaders"`
	RetryPolicy           RetryPolicy `yaml:"retryPolicy"`
}

type Route struct {
	Path                  string      `yaml:"path"`
	Prefix                string      `yaml:"prefix"`
	Match                 string      `yaml:"match"`
	Service               string      `yaml:"service"`
	AddRequestHeaders     []Header    `yaml:"addRequestHeaders"`
	AddResponseHeaders    []Header    `yaml:"addResponseHeaders"`
	RemoveResponseHeaders []string    `yaml:"removeResponseHeaders"`
	PrefixRewrite         string      `yaml:"prefixRewrite"`
	HostRewrite           string      `yaml:"hostRewrite"`
	AutoHostRewrite       bool        `yaml:"autoHostRewrite"`
	RetryPolicy           RetryPolicy `yaml:"retryPolicy"`
}

type Header struct {
	Name  string `yaml:"name"`
	Value string `yaml:"value"`
}


func main() {
	data, err := ioutil.ReadFile(os.Getenv("CONFIG_PATH"))
	if err != nil {
		panic(err)
	}
	var config Config

	if err := yaml.UnmarshalStrict([]byte(os.ExpandEnv(string(data))), &config); err != nil {
		panic(err)
	}

	fmt.Println(len(config.Services))
}