terraform/config/interpolate_funcs.go

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package config
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import (
"fmt"
"io/ioutil"
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"strings"
)
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// Funcs is the mapping of built-in functions for configuration.
var Funcs map[string]InterpolationFunc
func init() {
Funcs = map[string]InterpolationFunc{
"file": interpolationFuncFile,
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"lookup": interpolationFuncLookup,
}
}
// interpolationFuncFile implements the "file" function that allows
// loading contents from a file.
func interpolationFuncFile(
vs map[string]string, args ...string) (string, error) {
if len(args) != 1 {
return "", fmt.Errorf(
"file expects 1 arguments, got %d", len(args))
}
data, err := ioutil.ReadFile(args[0])
if err != nil {
return "", err
}
return string(data), nil
}
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// interpolationFuncLookup implements the "lookup" function that allows
// dynamic lookups of map types within a Terraform configuration.
func interpolationFuncLookup(
vs map[string]string, args ...string) (string, error) {
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if len(args) != 2 {
return "", fmt.Errorf(
"lookup expects 2 arguments, got %d", len(args))
}
k := fmt.Sprintf("var.%s", strings.Join(args, "."))
v, ok := vs[k]
if !ok {
return "", fmt.Errorf(
"lookup in '%s' failed to find '%s'",
args[0], args[1])
}
return v, nil
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}