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builder.go
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builder.go
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package template
import (
"bytes"
"regexp"
"strconv"
"text/template"
"github.com/pkg/errors"
"github.com/replicatedhq/kots/pkg/docker/registry"
dockerregistrytypes "github.com/replicatedhq/kots/pkg/docker/registry/types"
"github.com/replicatedhq/kots/pkg/k8sutil"
registrytypes "github.com/replicatedhq/kots/pkg/registry/types"
kotsv1beta1 "github.com/replicatedhq/kotskinds/apis/kots/v1beta1"
)
var (
templateNotDefinedRegexp = regexp.MustCompile(`template.*not defined$`)
)
type Builder struct {
Ctx []Ctx
Functs template.FuncMap
}
type BuilderOptions struct {
ConfigGroups []kotsv1beta1.ConfigGroup
ExistingValues map[string]ItemValue
LocalRegistry registrytypes.RegistrySettings
License *kotsv1beta1.License
Application *kotsv1beta1.Application
ApplicationInfo *ApplicationInfo
VersionInfo *VersionInfo
IdentityConfig *kotsv1beta1.IdentityConfig
Namespace string
DecryptValues bool
}
// NewBuilder creates a builder with all available contexts.
func NewBuilder(opts BuilderOptions) (Builder, map[string]ItemValue, error) {
b := Builder{}
// do not fail on being unable to get dockerhub credentials, since they're just used to increase the rate limit
dockerHubRegistry := dockerregistrytypes.RegistryOptions{}
if opts.Namespace != "" {
clientset, err := k8sutil.GetClientset()
if err == nil {
dockerHubRegistryCreds, _ := registry.GetDockerHubCredentials(clientset, opts.Namespace)
dockerHubRegistry = dockerregistrytypes.RegistryOptions{
Username: dockerHubRegistryCreds.Username,
Password: dockerHubRegistryCreds.Password,
}
}
}
slug := ""
if opts.ApplicationInfo != nil {
slug = opts.ApplicationInfo.Slug
}
configCtx, err := b.newConfigContext(opts.ConfigGroups, opts.ExistingValues, opts.LocalRegistry,
opts.License, opts.Application, opts.VersionInfo, dockerHubRegistry, slug, opts.DecryptValues)
if err != nil {
return Builder{}, nil, errors.Wrap(err, "create config context")
}
b.Ctx = []Ctx{
StaticCtx{},
licenseCtx{License: opts.License, App: opts.Application, VersionInfo: opts.VersionInfo},
newKurlContext("base", "default"), // can be hardcoded because kurl always deploys to the default namespace
newVersionCtx(opts.VersionInfo),
newIdentityCtx(opts.IdentityConfig, opts.ApplicationInfo),
configCtx,
}
return b, configCtx.ItemValues, nil
}
func (b *Builder) AddCtx(ctx Ctx) {
b.Ctx = append(b.Ctx, ctx)
}
func (b *Builder) String(text string) (string, error) {
if text == "" {
return "", nil
}
result, err := b.RenderTemplate(text, text)
return result, err
}
func (b *Builder) Bool(text string, defaultVal bool) (bool, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render bool template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseBool(value)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) Int(text string, defaultVal int64) (int64, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render int template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseInt(value, 10, 64)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) Uint(text string, defaultVal uint64) (uint64, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render uint template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseUint(value, 10, 64)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) Float64(text string, defaultVal float64) (float64, error) {
if text == "" {
return defaultVal, nil
}
value, err := b.RenderTemplate(text, text)
if err != nil {
return defaultVal, errors.Wrap(err, "failed to render float template")
}
// If the template didn't parse (turns into an empty string), then we should
// return the default
if value == "" {
return defaultVal, nil
}
result, err := strconv.ParseFloat(value, 64)
if err != nil {
// for now we are assuming default value if we fail to parse
return defaultVal, nil
}
return result, nil
}
func (b *Builder) BuildFuncMap() template.FuncMap {
if b.Functs == nil {
b.Functs = template.FuncMap{}
}
funcMap := b.Functs
for _, ctx := range b.Ctx {
for name, fn := range ctx.FuncMap() {
funcMap[name] = fn
}
}
return funcMap
}
func (b *Builder) GetTemplate(name, text string, rdelim, ldelim string) (*template.Template, error) {
tmpl, err := template.New(name).Delims(rdelim, ldelim).Funcs(b.BuildFuncMap()).Parse(text)
if err != nil {
return nil, err
}
return tmpl, nil
}
func (b *Builder) RenderTemplate(name string, text string) (string, error) {
delims := []struct {
rdelim string
ldelim string
}{
{"{{repl", "}}"},
{"repl{{", "}}"},
}
curText := text
for _, d := range delims {
tmpl, err := b.GetTemplate(name, curText, d.rdelim, d.ldelim)
if err != nil {
return "", errors.Wrap(err, "failed to get template")
}
var contents bytes.Buffer
if err := tmpl.Execute(&contents, nil); err != nil {
return "", errors.Wrap(err, "failed to execute template")
}
curText = contents.String()
}
return curText, nil
}