run.go

/*
Copyright 2017 WALLIX

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 commands

import (
	"bytes"
	"errors"
	"fmt"
	"io/ioutil"
	"strings"

	"github.com/fatih/color"
	"github.com/spf13/cobra"
	"github.com/wallix/awless/cloud"
	awscloud "github.com/wallix/awless/cloud/aws"
	"github.com/wallix/awless/cloud/aws/validation"
	"github.com/wallix/awless/database"
	"github.com/wallix/awless/graph"
	"github.com/wallix/awless/logger"
	"github.com/wallix/awless/sync"
	"github.com/wallix/awless/template"
	"github.com/wallix/awless/template/driver/aws"
)

var renderGreenFn = color.New(color.FgGreen).SprintFunc()
var renderRedFn = color.New(color.FgRed).SprintFunc()

func init() {
	RootCmd.AddCommand(runCmd)
	for action, entities := range aws.DriverSupportedActions() {
		RootCmd.AddCommand(
			createDriverCommands(action, entities),
		)
	}
}

var runCmd = &cobra.Command{
	Use:                "run",
	Short:              "Run a template given a filepath",
	PersistentPreRun:   applyHooks(initLoggerHook, initAwlessEnvHook, initCloudServicesHook, initSyncerHook, checkStatsHook),
	PersistentPostRunE: saveHistoryHook,

	RunE: func(cmd *cobra.Command, args []string) error {
		if len(args) != 1 {
			return errors.New("missing awless template file path")
		}

		content, err := ioutil.ReadFile(args[0])
		if err != nil {
			return err
		}

		templ, err := template.Parse(string(content))
		exitOn(err)

		exitOn(runTemplate(templ, getCurrentDefaults()))

		return nil
	},
}

func runTemplate(templ *template.Template, defaults map[string]interface{}) error {
	resolved, err := templ.ResolveHoles(defaults)
	exitOn(err)
	logger.Infof("used default params: %s", sprintProcessedParams(resolved))

	fills := make(map[string]interface{})
	if holes := templ.GetHolesValuesSet(); len(holes) > 0 {
		fmt.Println("\nMissing required params (Ctrl+C to quit):")
		for _, hole := range holes {
			var resp string
			ask := func() error {
				fmt.Printf("%s ? ", hole)
				_, err := fmt.Scanln(&resp)
				return err
			}
			for err := ask(); err != nil; err = ask() {
				logger.Errorf("invalid value: %s", err)
			}
			fills[hole] = resp
		}
	}

	if len(fills) > 0 {
		templ.ResolveHoles(fills)
	}

	awsDriver := aws.NewDriver(
		awscloud.InfraService.ProviderRunnableAPI(),
		awscloud.AccessService.ProviderRunnableAPI(),
		awscloud.StorageService.ProviderRunnableAPI(),
	)
	awsDriver.SetLogger(logger.DefaultLogger)

	for _, cmd := range templ.CommandNodesIterator() {
		if validators, ok := validation.ValidatorsPerActions[cmd.Action]; ok {
			graph := sync.LoadCurrentLocalGraph(awscloud.ServicePerResourceType[cmd.Entity])
			for _, v := range validators {
				if err := v.Validate(graph, cmd.Params); err != nil {
					return err
				}
			}
		}
	}

	_, err = templ.Compile(awsDriver)
	exitOn(err)

	fmt.Println()
	fmt.Printf("%s\n", renderGreenFn(templ))
	fmt.Println()
	fmt.Print("Run verified operations above? (y/n): ")
	var yesorno string
	_, err = fmt.Scanln(&yesorno)

	if strings.TrimSpace(yesorno) == "y" {
		newTempl, err := templ.Run(awsDriver)

		executed := template.NewTemplateExecution(newTempl)

		fmt.Println()
		printReport(executed)

		db, err, close := database.Current()
		exitOn(err)
		defer close()

		db.AddTemplateExecution(executed)

		if err == nil && !executed.HasErrors() {
			if autoSync, ok := defaults[database.SyncAuto]; ok && autoSync.(bool) {
				runSyncFor(newTempl)
			}
		}
	}

	return nil
}

func createDriverCommands(action string, entities []string) *cobra.Command {
	actionCmd := &cobra.Command{
		Use:   action,
		Short: fmt.Sprintf("Allow to %s: %v", action, strings.Join(entities, ", ")),
	}

	for _, entity := range entities {
		templDef, ok := aws.AWSTemplatesDefinitions[fmt.Sprintf("%s%s", action, entity)]
		if !ok {
			exitOn(errors.New("command unsupported on inline mode"))
		}

		run := func(def template.TemplateDefinition) func(cmd *cobra.Command, args []string) error {
			return func(cmd *cobra.Command, args []string) error {
				text := fmt.Sprintf("%s %s %s", def.Action, def.Entity, strings.Join(args, " "))

				cliTpl, err := template.Parse(text)
				exitOn(err)

				templ, err := template.Parse(def.String())
				if err != nil {
					exitOn(fmt.Errorf("internal error parsing template definition\n`%s`\n%s", def, err))
				}
				logger.Verbosef("template definition: %s", def)

				resolved, err := templ.ResolveHoles(
					cliTpl.GetNormalizedParams(),
					resolveAlias(cliTpl.GetNormalizedAliases(), def.Entity),
				)
				exitOn(err)

				logger.Infof("used provided params: %s.", sprintProcessedParams(resolved))
				templ.MergeParams(cliTpl.GetNormalizedParams())

				exitOn(runTemplate(templ, getCurrentDefaults()))
				return nil
			}
		}

		actionCmd.AddCommand(
			&cobra.Command{
				Use:                templDef.Entity,
				PersistentPreRun:   applyHooks(initLoggerHook, initAwlessEnvHook, initCloudServicesHook, initSyncerHook, checkStatsHook),
				PersistentPostRunE: saveHistoryHook,
				Short:              fmt.Sprintf("%s a %s", strings.Title(action), templDef.Entity),
				Long:               fmt.Sprintf("%s a %s\n\tRequired params: %s\n\tExtra params: %s", strings.Title(templDef.Action), templDef.Entity, strings.Join(templDef.Required(), ", "), strings.Join(templDef.Extra(), ", ")),
				RunE:               run(templDef),
			},
		)
	}

	return actionCmd
}

func runSyncFor(tpl *template.Template) {
	lookup := func(key string) (t template.TemplateDefinition, ok bool) {
		t, ok = aws.AWSTemplatesDefinitions[key]
		return
	}
	collector := &template.CollectDefinitions{L: lookup}
	tpl.Visit(collector)

	uniqueNames := make(map[string]bool)
	for _, def := range collector.C {
		name, ok := awscloud.ServicePerAPI[def.Api]
		if ok {
			uniqueNames[name] = true
		}
	}

	var srvNames []string
	for name, _ := range uniqueNames {
		srvNames = append(srvNames, name)
	}

	var services []cloud.Service
	for _, name := range srvNames {
		srv, ok := cloud.ServiceRegistry[name]
		if !ok {
			logger.Errorf("internal: cannot resolve service name '%s'", name)
		} else {
			services = append(services, srv)
		}
	}

	if _, err := sync.DefaultSyncer.Sync(services...); err != nil {
		logger.Errorf("error while synching for %s\n", strings.Join(srvNames, ", "))
	} else {
		logger.Verbosef("performed sync for %s", strings.Join(srvNames, ", "))
	}
}

func getCurrentDefaults() map[string]interface{} {
	db, err, dbclose := database.Current()
	exitOn(err)
	defaults, err := db.GetDefaults()
	exitOn(err)
	dbclose()
	return defaults
}

func printReport(t *template.TemplateExecution) {
	for _, done := range t.Executed {
		var line bytes.Buffer
		if done.Result != "" {
			line.WriteString(fmt.Sprintf("%s %s ", done.Result, renderGreenFn("<-")))
		}
		line.WriteString(fmt.Sprintf("%s", done.Line))

		if done.Err != "" {
			line.WriteString(fmt.Sprintf("\n\terror: %s", done.Err))
		}

		if done.Err == "" {
			logger.Info(line.String())
		} else {
			logger.Error(line.String())
		}
	}

	if t.IsRevertible() {
		logger.Infof("revert this template with `awless revert %s`", t.ID)
	}
}

func resolveAlias(aliases map[string]string, entity string) map[string]interface{} {
	graphForResource := sync.LoadCurrentLocalGraph(awscloud.ServicePerResourceType[entity])

	resolved := make(map[string]interface{})

	for k, v := range aliases {
		var t string
		if strings.Split(k, ".")[1] == "id" {
			t = strings.Split(k, ".")[0]
		} else {
			t = strings.Split(k, ".")[1]
		}
		rT := graph.ResourceType(t)
		a := graph.Alias(v)
		if id, ok := a.ResolveToId(graphForResource, rT); ok {
			resolved[k] = id
		} else {
			logger.Infof("alias '%s' not in local snapshot. You might want to perform an `awless sync`\n", a)
		}
	}

	return resolved
}

func sprintProcessedParams(processed map[string]interface{}) string {
	if len(processed) == 0 {
		return "<none>"
	}
	var str []string
	for k, v := range processed {
		str = append(str, fmt.Sprintf("%s=%v", k, v))
	}
	return strings.Join(str, ", ")
}