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