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package terraform
import (
"fmt"
"os"
"strings"
"github.com/hashicorp/terraform/config"
"github.com/hashicorp/terraform/config/module"
"github.com/hashicorp/terraform/helper/hilmapstructure"
)
// Variables returns the fully loaded set of variables to use with
// ContextOpts and NewContext, loading any additional variables from
// the environment or any other sources.
//
// The given module tree doesn't need to be loaded.
func Variables(
m *module.Tree,
override map[string]interface{}) (map[string]interface{}, error) {
result := make(map[string]interface{})
// Variables are loaded in the following sequence. Each additional step
// will override conflicting variable keys from prior steps:
//
// * Take default values from config
// * Take values from TF_VAR_x env vars
// * Take values specified in the "override" param which is usually
// from -var, -var-file, etc.
//
// First load from the config
for _, v := range m.Config().Variables {
// If the var has no default, ignore
if v.Default == nil {
continue
}
// If the type isn't a string, we use it as-is since it is a rich type
if v.Type() != config.VariableTypeString {
result[v.Name] = v.Default
continue
}
// v.Default has already been parsed as HCL but it may be an int type
switch typedDefault := v.Default.(type) {
case string:
if typedDefault == "" {
continue
}
result[v.Name] = typedDefault
case int, int64:
result[v.Name] = fmt.Sprintf("%d", typedDefault)
case float32, float64:
result[v.Name] = fmt.Sprintf("%f", typedDefault)
case bool:
result[v.Name] = fmt.Sprintf("%t", typedDefault)
default:
panic(fmt.Sprintf(
"Unknown default var type: %T\n\n"+
"THIS IS A BUG. Please report it.",
v.Default))
}
}
// Load from env vars
for _, v := range os.Environ() {
if !strings.HasPrefix(v, VarEnvPrefix) {
continue
}
// Strip off the prefix and get the value after the first "="
idx := strings.Index(v, "=")
k := v[len(VarEnvPrefix):idx]
v = v[idx+1:]
// Override the configuration-default values. Note that *not* finding the variable
// in configuration is OK, as we don't want to preclude people from having multiple
// sets of TF_VAR_whatever in their environment even if it is a little weird.
for _, schema := range m.Config().Variables {
if schema.Name != k {
continue
}
varType := schema.Type()
varVal, err := parseVariableAsHCL(k, v, varType)
if err != nil {
return nil, err
}
switch varType {
case config.VariableTypeMap:
if err := varSetMap(result, k, varVal); err != nil {
return nil, err
}
default:
result[k] = varVal
}
}
}
// Load from overrides
for k, v := range override {
for _, schema := range m.Config().Variables {
if schema.Name != k {
continue
}
switch schema.Type() {
case config.VariableTypeList:
result[k] = v
case config.VariableTypeMap:
if err := varSetMap(result, k, v); err != nil {
return nil, err
}
case config.VariableTypeString:
// Convert to a string and set. We don't catch any errors
// here because the validation step later should catch
// any type errors.
var strVal string
if err := hilmapstructure.WeakDecode(v, &strVal); err == nil {
result[k] = strVal
} else {
result[k] = v
}
default:
panic(fmt.Sprintf(
"Unhandled var type: %T\n\n"+
"THIS IS A BUG. Please report it.",
schema.Type()))
}
}
}
return result, nil
}
// varSetMap sets or merges the map in "v" with the key "k" in the
// "current" set of variables. This is just a private function to remove
// duplicate logic in Variables
func varSetMap(current map[string]interface{}, k string, v interface{}) error {
existing, ok := current[k]
if !ok {
current[k] = v
return nil
}
existingMap, ok := existing.(map[string]interface{})
if !ok {
panic(fmt.Sprintf("%q is not a map, this is a bug in Terraform.", k))
}
switch typedV := v.(type) {
case []map[string]interface{}:
for newKey, newVal := range typedV[0] {
existingMap[newKey] = newVal
}
case map[string]interface{}:
for newKey, newVal := range typedV {
existingMap[newKey] = newVal
}
default:
return fmt.Errorf("variable %q should be type map, got %s", k, hclTypeName(v))
}
return nil
}
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