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testing.go
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testing.go
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package hclutils
import (
"testing"
"github.com/hashicorp/go-msgpack/codec"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/ast"
"github.com/mitchellh/mapstructure"
"github.com/stretchr/testify/require"
"github.com/zclconf/go-cty/cty"
"github.com/hashicorp/nomad/helper/pluginutils/hclspecutils"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/plugins/drivers"
"github.com/hashicorp/nomad/plugins/shared/hclspec"
)
type HCLParser struct {
spec *hclspec.Spec
vars map[string]cty.Value
}
// NewConfigParser return a helper for parsing drivers TaskConfig
// Parser is an immutable object can be used in multiple tests
func NewConfigParser(spec *hclspec.Spec) *HCLParser {
return &HCLParser{
spec: spec,
}
}
// WithVars returns a new parser that uses passed vars when interpolated strings in config
func (b *HCLParser) WithVars(vars map[string]cty.Value) *HCLParser {
return &HCLParser{
spec: b.spec,
vars: vars,
}
}
// ParseJson parses the json config string and decode it into the `out` parameter.
// out parameter should be a golang reference to a driver specific TaskConfig reference.
// The function terminates and reports errors if any is found during conversion.
//
// Sample invocation would be
//
// ```
// var tc *TaskConfig
// hclutils.NewConfigParser(spec).ParseJson(t, configString, &tc)
// ```
func (b *HCLParser) ParseJson(t *testing.T, configStr string, out interface{}) {
config := JsonConfigToInterface(t, configStr)
b.parse(t, config, out)
}
// ParseHCL parses the hcl config string and decode it into the `out` parameter.
// out parameter should be a golang reference to a driver specific TaskConfig reference.
// The function terminates and reports errors if any is found during conversion.
//
// Sample invocation would be
//
// ```
// var tc *TaskConfig
// hclutils.NewConfigParser(spec).ParseHCL(t, configString, &tc)
// ```
func (b *HCLParser) ParseHCL(t *testing.T, configStr string, out interface{}) {
config := HclConfigToInterface(t, configStr)
b.parse(t, config, out)
}
func (b *HCLParser) parse(t *testing.T, config, out interface{}) {
decSpec, diags := hclspecutils.Convert(b.spec)
require.Empty(t, diags)
ctyValue, diag, errs := ParseHclInterface(config, decSpec, b.vars)
if len(errs) > 1 {
t.Error("unexpected errors parsing file")
for _, err := range errs {
t.Errorf(" * %v", err)
}
t.FailNow()
}
require.Empty(t, diag)
// encode
dtc := &drivers.TaskConfig{}
require.NoError(t, dtc.EncodeDriverConfig(ctyValue))
// decode
require.NoError(t, dtc.DecodeDriverConfig(out))
}
func HclConfigToInterface(t *testing.T, config string) interface{} {
t.Helper()
// Parse as we do in the jobspec parser
root, err := hcl.Parse(config)
if err != nil {
t.Fatalf("failed to hcl parse the config: %v", err)
}
// Top-level item should be a list
list, ok := root.Node.(*ast.ObjectList)
if !ok {
t.Fatalf("root should be an object")
}
var m map[string]interface{}
if err := hcl.DecodeObject(&m, list.Items[0]); err != nil {
t.Fatalf("failed to decode object: %v", err)
}
var m2 map[string]interface{}
if err := mapstructure.WeakDecode(m, &m2); err != nil {
t.Fatalf("failed to weak decode object: %v", err)
}
return m2["config"]
}
func JsonConfigToInterface(t *testing.T, config string) interface{} {
t.Helper()
// Decode from json
dec := codec.NewDecoderBytes([]byte(config), structs.JsonHandle)
var m map[string]interface{}
err := dec.Decode(&m)
if err != nil {
t.Fatalf("failed to decode: %v", err)
}
return m["Config"]
}