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package templater
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"text/template"
"github.com/Masterminds/sprig"
"github.com/polydawn/meep"
"github.com/tazjin/kontemplate/context"
)
// Error that is caused by non-existent template files being specified
type TemplateNotFoundError struct {
meep.AllTraits
Name string
}
// Error that is caused during templating, e.g. required value being absent or invalid template format
type TemplatingError struct {
meep.AllTraits
}
func LoadAndPrepareTemplates(include *[]string, exclude *[]string, c *context.Context) (output []string, err error) {
limitedResourceSets := applyLimits(&c.ResourceSets, include, exclude)
for _, rs := range *limitedResourceSets {
err = processResourceSet(c, &rs, &output)
if err != nil {
return
}
}
return
}
func processResourceSet(c *context.Context, rs *context.ResourceSet, output *[]string) error {
fmt.Fprintf(os.Stderr, "Loading resources for %s\n", rs.Name)
rp := path.Join(c.BaseDir, rs.Name)
files, err := ioutil.ReadDir(rp)
err = processFiles(c, rs, rp, files, output)
if err != nil {
return meep.New(
&TemplateNotFoundError{Name: rs.Name},
meep.Cause(err),
)
}
return nil
}
func processFiles(c *context.Context, rs *context.ResourceSet, rp string, files []os.FileInfo, output *[]string) error {
for _, file := range files {
if !file.IsDir() && isResourceFile(file) {
p := path.Join(rp, file.Name())
o, err := templateFile(c, rs, p)
if err != nil {
return err
}
*output = append(*output, o)
}
}
return nil
}
func templateFile(c *context.Context, rs *context.ResourceSet, filename string) (string, error) {
tpl, err := template.New(path.Base(filename)).Funcs(templateFuncs()).ParseFiles(filename)
if err != nil {
return "", meep.New(
&TemplateNotFoundError{Name: filename},
meep.Cause(err),
)
}
var b bytes.Buffer
// Guard against empty map before merging keys
if rs.Values == nil {
rs.Values = make(map[string]interface{}, 0)
}
// Merge global and resourceset-specific values (don't override from global)
for k, v := range c.Global {
if _, ok := rs.Values[k]; !ok {
rs.Values[k] = v
}
}
err = tpl.Execute(&b, rs.Values)
if err != nil {
return "", meep.New(
&TemplatingError{},
meep.Cause(err),
)
}
return b.String(), nil
}
// Applies the limits of explicitly included or excluded resources and returns the updated resource set.
// Exclude takes priority over include
func applyLimits(rs *[]context.ResourceSet, include *[]string, exclude *[]string) *[]context.ResourceSet {
if len(*include) == 0 && len(*exclude) == 0 {
return rs
}
// Exclude excluded resource sets
excluded := make([]context.ResourceSet, 0)
for _, r := range *rs {
if !contains(exclude, &r.Name) {
excluded = append(excluded, r)
}
}
// Include included resource sets
if len(*include) == 0 {
return &excluded
}
included := make([]context.ResourceSet, 0)
for _, r := range excluded {
if contains(include, &r.Name) {
included = append(included, r)
}
}
return &included
}
// Check whether a certain string is contained in a string slice
func contains(s *[]string, v *string) bool {
for _, r := range *s {
if r == *v {
return true
}
}
return false
}
func templateFuncs() template.FuncMap {
m := sprig.TxtFuncMap()
m["json"] = func(data interface{}) string {
b, _ := json.Marshal(data)
return string(b)
}
return m
}
// Checks whether a file is a resource file (i.e. is YAML or JSON)
func isResourceFile(f os.FileInfo) bool {
return strings.HasSuffix(f.Name(), "yaml") ||
strings.HasSuffix(f.Name(), "yml") ||
strings.HasSuffix(f.Name(), "json")
}
|
