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// Copyright 2018 ThousandEyes Inc.
//
// 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 environment
import (
"fmt"
"html/template"
"io/ioutil"
"net"
"os"
"path"
"path/filepath"
"regexp"
"sync"
"github.com/thousandeyes/shoelaces/internal/event"
"github.com/thousandeyes/shoelaces/internal/log"
"github.com/thousandeyes/shoelaces/internal/mappings"
"github.com/thousandeyes/shoelaces/internal/server"
"github.com/thousandeyes/shoelaces/internal/templates"
)
// Environment struct holds the shoelaces instance global data.
type Environment struct {
ConfigFile string
HostnameMaps []mappings.HostnameMap
NetworkMaps []mappings.NetworkMap
ServerStates *server.States
EventLog *event.Log
ParamsBlacklist []string
Templates *templates.ShoelacesTemplates // Dynamic slc templates
StaticTemplates *template.Template // Static Templates
Environments []string // Valid config environments
Logger log.Logger
BindAddr string
BaseURL string
DataDir string
StaticDir string
EnvDir string
TemplateExtension string
MappingsFile string
Debug bool
}
// New returns an initialized environment structure
func New() *Environment {
env := defaultEnvironment()
env.setFlags()
env.validateFlags()
if env.Debug {
env.Logger = log.AllowDebug(env.Logger)
}
if env.BaseURL == "" {
env.BaseURL = env.BindAddr
}
env.Environments = env.initEnvOverrides()
env.EventLog = &event.Log{}
env.Logger.Info("component", "environment", "msg", "Override found", "environment", env.Environments)
mappingsPath := path.Join(env.DataDir, env.MappingsFile)
if err := env.initMappings(mappingsPath); err != nil {
panic(err)
}
env.initStaticTemplates()
env.Templates.ParseTemplates(env.Logger, env.DataDir, env.EnvDir, env.Environments, env.TemplateExtension)
server.StartStateCleaner(env.Logger, env.ServerStates)
return env
}
func defaultEnvironment() *Environment {
env := &Environment{}
env.NetworkMaps = make([]mappings.NetworkMap, 0)
env.HostnameMaps = make([]mappings.HostnameMap, 0)
env.ServerStates = &server.States{sync.RWMutex{}, make(map[string]*server.State)}
env.ParamsBlacklist = []string{"baseURL"}
env.Templates = templates.New()
env.Environments = make([]string, 0)
env.Logger = log.MakeLogger(os.Stdout)
return env
}
func (env *Environment) initStaticTemplates() {
staticTemplates := []string{
path.Join(env.StaticDir, "templates/html/header.html"),
path.Join(env.StaticDir, "templates/html/index.html"),
path.Join(env.StaticDir, "templates/html/events.html"),
path.Join(env.StaticDir, "templates/html/mappings.html"),
path.Join(env.StaticDir, "templates/html/footer.html"),
}
fmt.Println(env.StaticDir)
for _, t := range staticTemplates {
if _, err := os.Stat(t); err != nil {
env.Logger.Error("component", "environment", "msg", "Template does not exists!", "environment", t)
os.Exit(1)
}
}
env.StaticTemplates = template.Must(template.ParseFiles(staticTemplates...))
}
func (env *Environment) initEnvOverrides() []string {
var environments = make([]string, 0)
envPath := filepath.Join(env.DataDir, env.EnvDir)
files, err := ioutil.ReadDir(envPath)
if err == nil {
for _, f := range files {
if f.IsDir() {
environments = append(environments, f.Name())
}
}
}
return environments
}
func (env *Environment) initMappings(mappingsPath string) error {
configMappings := mappings.ParseYamlMappings(env.Logger, mappingsPath)
for _, configNetMap := range configMappings.NetworkMaps {
_, ipnet, err := net.ParseCIDR(configNetMap.Network)
if err != nil {
return err
}
netMap := mappings.NetworkMap{Network: ipnet, Script: initScript(configNetMap.Script)}
env.NetworkMaps = append(env.NetworkMaps, netMap)
}
for _, configHostMap := range configMappings.HostnameMaps {
regex, err := regexp.Compile(configHostMap.Hostname)
if err != nil {
return err
}
hostMap := mappings.HostnameMap{Hostname: regex, Script: initScript(configHostMap.Script)}
env.HostnameMaps = append(env.HostnameMaps, hostMap)
}
return nil
}
func initScript(configScript mappings.YamlScript) *mappings.Script {
mappingScript := &mappings.Script{
Name: configScript.Name,
Environment: configScript.Environment,
Params: make(map[string]interface{}),
}
for key := range configScript.Params {
mappingScript.Params[key] = configScript.Params[key]
}
return mappingScript
}
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