forked from wallix/awless
/
spec.go
225 lines (192 loc) · 4.73 KB
/
spec.go
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package awsspec
import (
"errors"
"fmt"
"math/rand"
"reflect"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/wallix/awless/template/env"
"github.com/wallix/awless/template/params"
"github.com/fatih/color"
"github.com/wallix/awless/cloud"
"github.com/wallix/awless/logger"
)
const (
dryRunOperation = "DryRunOperation"
notFound = "NotFound"
)
type BeforeRunner interface {
BeforeRun(env.Running) error
}
type AfterRunner interface {
AfterRun(env.Running, interface{}) error
}
type ResultExtractor interface {
ExtractResult(interface{}) string
}
type command interface {
ParamsSpec() params.Spec
inject(map[string]interface{}) error
Run(env.Running, map[string]interface{}) (interface{}, error)
}
func implementsBeforeRun(i interface{}) (BeforeRunner, bool) {
v, ok := i.(BeforeRunner)
return v, ok
}
func implementsAfterRun(i interface{}) (AfterRunner, bool) {
v, ok := i.(AfterRunner)
return v, ok
}
func implementsResultExtractor(i interface{}) (ResultExtractor, bool) {
v, ok := i.(ResultExtractor)
return v, ok
}
func fakeDryRunId(entity string) string {
suffix := rand.Intn(1e6)
switch entity {
case cloud.Instance:
return fmt.Sprintf("i-%d", suffix)
case cloud.Subnet:
return fmt.Sprintf("subnet-%d", suffix)
case cloud.Vpc:
return fmt.Sprintf("vpc-%d", suffix)
case cloud.Volume:
return fmt.Sprintf("vol-%d", suffix)
case cloud.SecurityGroup:
return fmt.Sprintf("sg-%d", suffix)
case cloud.InternetGateway:
return fmt.Sprintf("igw-%d", suffix)
case cloud.NatGateway:
return fmt.Sprintf("nat-%d", suffix)
case cloud.RouteTable:
return fmt.Sprintf("rtb-%d", suffix)
default:
return fmt.Sprintf("dryrunid-%d", suffix)
}
}
type awsCall struct {
fnName string
fn interface{}
logger *logger.Logger
setters []setter
}
func (dc *awsCall) execute(input interface{}) (output interface{}, err error) {
defer func() {
if e := recover(); e != nil {
output = nil
err = fmt.Errorf("%s", e)
}
}()
for _, s := range dc.setters {
if err = s.set(input); err != nil {
return nil, err
}
}
fnVal := reflect.ValueOf(dc.fn)
values := []reflect.Value{reflect.ValueOf(input)}
start := time.Now()
results := fnVal.Call(values)
if err, ok := results[1].Interface().(error); ok && err != nil {
return nil, fmt.Errorf("%s", err)
}
dc.logger.ExtraVerbosef("%s call took %s", dc.fnName, time.Since(start))
output = results[0].Interface()
return
}
type checker struct {
description string
timeout time.Duration
frequency time.Duration
fetchFunc func() (string, error)
expect string
logger *logger.Logger
checkName string
}
func (c *checker) check() error {
now := time.Now().UTC()
timer := time.NewTimer(c.timeout)
if c.checkName == "" {
c.checkName = "status"
}
defer timer.Stop()
defer c.logger.Println()
for {
select {
case <-timer.C:
return fmt.Errorf("timeout of %s expired", c.timeout)
default:
}
got, err := c.fetchFunc()
if err != nil {
return fmt.Errorf("check %s: %s", c.description, err)
}
if strings.ToLower(got) == strings.ToLower(c.expect) {
c.logger.InteractiveInfof("check %s %s '%s' done", c.description, c.checkName, c.expect)
return nil
}
elapsed := time.Since(now)
c.logger.InteractiveInfof("%s %s '%s', expect '%s', timeout in %s (retry in %s)", c.description, c.checkName, got, c.expect, color.New(color.FgGreen).Sprint(c.timeout-elapsed.Round(time.Second)), c.frequency)
time.Sleep(c.frequency)
}
}
type enumValidator struct {
expected []string
}
func NewEnumValidator(expected ...string) *enumValidator {
return &enumValidator{expected: expected}
}
func (v *enumValidator) Validate(in *string) error {
val := strings.ToLower(StringValue(in))
for _, e := range v.expected {
if val == strings.ToLower(e) {
return nil
}
}
var expString string
switch len(v.expected) {
case 0:
return errors.New("empty enumeration")
case 1:
expString = fmt.Sprintf("'%s'", v.expected[0])
case 2:
expString = fmt.Sprintf("'%s' or '%s'", v.expected[0], v.expected[1])
default:
expString = fmt.Sprintf("'%s' or '%s'", strings.Join(v.expected[0:len(v.expected)-1], "', '"), v.expected[len(v.expected)-1])
}
return fmt.Errorf("invalid value '%s' expect %s", StringValue(in), expString)
}
func String(v string) *string {
return &v
}
func StringValue(v *string) string {
if v != nil {
return *v
}
return ""
}
func Int64(v int64) *int64 {
return &v
}
func Int64AsIntValue(v *int64) int {
if v != nil {
return int(*v)
}
return 0
}
func Bool(v bool) *bool {
return &v
}
func BoolValue(v *bool) bool {
if v != nil {
return *v
}
return false
}
func decorateAWSError(err error) error {
if aerr, ok := err.(awserr.Error); ok {
return fmt.Errorf("%s: %s", aerr.Code(), aerr.Message())
}
return err
}