Golang template.Rules類代碼示例

func TestMakeFnIncludeFile_BasicRule(t *testing.T) {
	templateRules := template.Rules{}
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		if key == "content" {
			return key, interface{}("replaced")
		}

		return key, node
	})

	fs := mapfs.New(map[string]string{"a": "{\"content\": 1}"})
	fnIncludeFile := MakeFnIncludeFile(fs, &templateRules)
	input := interface{}(map[string]interface{}{
		"Fn::IncludeFile": "/a",
	})

	expected := interface{}(map[string]interface{}{"content": "replaced"})
	newKey, newNode := fnIncludeFile([]interface{}{"x", "y"}, input)
	if newKey != "y" {
		t.Fatalf("FnIncludeFile modified the path (%v instead of %v)", newKey, "y")
	}

	if !reflect.DeepEqual(newNode, expected) {
		t.Fatalf("FnIncludeFile did not return the expected result (%#v instead of %#v)", newNode, expected)
	}
}

func TestFnFor_BasicRule(t *testing.T) {
	stack := deepstack.DeepStack{}
	templateRules := template.Rules{}
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		if key == 1 {
			return key, interface{}("replaced")
		}

		return key, node
	})

	fnFor := MakeFnFor(&stack, &templateRules)
	input := interface{}(map[string]interface{}{
		"Fn::For": []interface{}{[]interface{}{"key", "value"}, []interface{}{"a", "b"}, "aTemplate"},
	})

	expected := []interface{}{"aTemplate", "replaced"}
	newKey, newNode := fnFor([]interface{}{"x", "y"}, input)
	if newKey != "y" {
		t.Fatalf("FnFor modified the path (%v instead of %v)", newKey, "y")
	}

	if !reflect.DeepEqual(newNode, expected) {
		t.Fatalf("FnFor with did not return the expected result (%#v instead of %#v)", newNode, expected)
	}
}

func TestFnWith_BasicRule(t *testing.T) {
	stack := deepstack.DeepStack{}
	templateRules := template.Rules{}
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		return key, interface{}(map[string]interface{}{"a": "one"})
	})

	fnWith := MakeFnWith(&stack, &templateRules)
	input := interface{}(map[string]interface{}{
		"Fn::With": []interface{}{map[string]interface{}{"a": "one"}, "aTemplate"},
	})

	expected := interface{}(map[string]interface{}{"a": "one"})
	newKey, newNode := fnWith([]interface{}{"x", "y"}, input)
	if newKey != "y" {
		t.Fatalf("FnWith modified the path (%v instead of %v)", newKey, "y")
	}

	if !reflect.DeepEqual(newNode, expected) {
		t.Fatalf("FnWith with did not return the expected result (%#v instead of %#v)", newNode, expected)
	}
}

func TestFnFor_PreProcessArgs(t *testing.T) {
	stack := deepstack.DeepStack{}
	templateRules := template.Rules{}
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		aString, ok := node.(string)
		if !ok {
			return key, node
		}

		if aString == "skip" {
			return true, nil
		}

		if aString == "refNames" {
			return key, []interface{}{"key", "value"}
		}

		if aString == "values" {
			return key, []interface{}{"a"}
		}

		if aString == "template" {
			_, hasKey := stack.Get([]string{"value"})
			if hasKey {
				return key, "processed-template"
			}

			return key, "preprocessed-template"
		}

		return key, node
	})

	fnFor := MakeFnFor(&stack, &templateRules)
	input := interface{}(map[string]interface{}{
		"Fn::For": []interface{}{"skip", "refNames", "skip", "values", "skip", "template", "skip"},
	})

	expected := []interface{}{"processed-template"}
	newKey, newNode := fnFor([]interface{}{"x", "y"}, input)
	if newKey != "y" {
		t.Fatalf("FnFor modified the path (%v instead of %v)", newKey, "y")
	}

	if !reflect.DeepEqual(newNode, expected) {
		t.Fatalf("FnFor with did not return the expected result (%#v instead of %#v)", newNode, expected)
	}
}

func TestFnGetAtt_ProcessBound(t *testing.T) {
	stack := deepstack.DeepStack{}
	stack.Push(fallbackmap.DeepMap(map[string]interface{}{
		"FakeResource": map[string]interface{}{
			"FakeProperty": map[string]interface{}{"FakeSub": "FakeValue"},
		},
	}))
	templateRules := template.Rules{}
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		if stringVal, ok := node.(string); ok && stringVal == "FakeValue" {
			return key, interface{}("ProcessedFakeValue")
		}

		return key, node
	})

	inputs := []interface{}{
		[]interface{}{"FakeResource", "FakeProperty.FakeSub"},
	}

	expected := []interface{}{
		"ProcessedFakeValue",
	}

	for i, input := range inputs {
		fnGetAtt := MakeFnGetAtt(&stack, &templateRules)
		input := interface{}(map[string]interface{}{
			"Fn::GetAtt": input,
		})

		newKey, newNode := fnGetAtt([]interface{}{"x", "y"}, input)
		if newKey != "y" {
			t.Fatalf("FnGetAtt modified the path (%v instead of %v)", newKey, "y")
		}

		if !reflect.DeepEqual(newNode, expected[i]) {
			t.Fatalf("FnGetAtt for %v did not return the expected result (%#v instead of %#v)", input, newNode, expected[i])
		}
	}
}

func Test_Lazy_traversesTemplateRuleResults(t *testing.T) {
	testRules := template.Rules{}
	testRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		if key == "replaceThis" {
			return key, map[string]interface{}{
				"replacedDeep": "replacedDeepValue",
			}
		}

		return key, node
	})

	lazy := NewLazyMap(fallbackmap.DeepMap(map[string]interface{}{
		"a": "anA",
		"b": interface{}(map[string]interface{}{
			"innerA":      "anInnerA",
			"replaceThis": "this should be replaced",
		}),
		"replaceThis": "this should also be replaced",
	}), &testRules)

	for path, expected := range map[string]string{
		"b.replaceThis.replacedDeep": "replacedDeepValue",
		"replaceThis.replacedDeep":   "replacedDeepValue",
	} {
		result, has_key := lazy.Get(strings.Split(path, "."))
		if !has_key {
			t.Fatalf("Get() of a rule-modified map did not claim to have a key for path %#v", path)
		}

		resultString, ok := result.(string)
		if !ok {
			t.Fatalf("Get() of a rule-modified map did not return the correct type of value for path %#v", path)
		}

		if resultString != expected {
			t.Fatalf("Get() of a rule-modified map did not return the expected value '%s' (got '%s' instead) for path %#v", expected, resultString, path)
		}
	}
}

func TestFnFor_StackWithArray(t *testing.T) {
	stack := deepstack.DeepStack{}
	stack.Push(fallbackmap.DeepMap(map[string]interface{}{"outer": "outerValue", "masked": "outerMasked"}))

	testRefNames := []interface{}{
		[]interface{}{"key", "masked"},
		[]interface{}{nil, "masked"},
		[]interface{}{"key", nil},
		[]interface{}{nil, nil},
		[]interface{}{"masked"},
		"masked",
	}

	expected := []interface{}{
		[]interface{}{
			map[string]interface{}{
				"outer":  []interface{}{"outerValue", true},
				"masked": []interface{}{"innerMasking", true},
				"key":    []interface{}{float64(0), true},
			},
		},
		[]interface{}{
			map[string]interface{}{
				"outer":  []interface{}{"outerValue", true},
				"masked": []interface{}{"innerMasking", true},
			},
		},
		[]interface{}{
			map[string]interface{}{
				"outer":  []interface{}{"outerValue", true},
				"masked": []interface{}{"outerMasked", true},
				"key":    []interface{}{float64(0), true},
			},
		},
		[]interface{}{
			map[string]interface{}{
				"outer":  []interface{}{"outerValue", true},
				"masked": []interface{}{"outerMasked", true},
			},
		},
		[]interface{}{
			map[string]interface{}{
				"outer":  []interface{}{"outerValue", true},
				"masked": []interface{}{"innerMasking", true},
			},
		},
		[]interface{}{
			map[string]interface{}{
				"outer":  []interface{}{"outerValue", true},
				"masked": []interface{}{"innerMasking", true},
			},
		},
	}

	for i, refNames := range testRefNames {
		input := interface{}(map[string]interface{}{
			"Fn::For": []interface{}{
				refNames,
				[]interface{}{"innerMasking"},
				"aTemplate",
			},
		})

		templateRules := template.Rules{}
		templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
			key := interface{}(nil)
			if len(path) > 0 {
				key = path[len(path)-1]
			}
			if stringVal, ok := node.(string); !ok || stringVal != "aTemplate" {
				return key, node
			}

			generated := map[string]interface{}{}
			for binding, _ := range expected[i].([]interface{})[0].(map[string]interface{}) {
				value, has_key := stack.Get([]string{binding})
				generated[binding] = []interface{}{value, has_key}
			}

			return key, generated
		})

		fnFor := MakeFnFor(&stack, &templateRules)
		newKey, newNode := fnFor([]interface{}{"x", "y"}, input)
		if newKey != "y" {
			t.Fatalf("FnFor modified the path (%v instead of %v)", newKey, "y")
		}

		if !reflect.DeepEqual(newNode, expected[i]) {
			t.Fatalf("FnFor did not have the correct stack values with refNames %v during templateRule (%#v instead of %#v)",
				refNames,
				newNode,
				expected[i],
			)
		}
	}
}

func TestFnWith_StackWithArray(t *testing.T) {
	stack := deepstack.DeepStack{}
	stack.Push(fallbackmap.DeepMap(map[string]interface{}{"outer": "outer-value", "masked": "masked-value"}))

	input := interface{}(map[string]interface{}{
		"Fn::With": []interface{}{
			map[string]interface{}{
				"masked": "masking-value",
				"inner":  "inner-value",
			},
			map[string]interface{}{
				"outer":     "replace-with-outer",
				"masked":    "replace-with-masked",
				"inner":     "replace-with-inner",
				"untouched": "stay-the-same",
			},
		},
	})

	expected := interface{}(map[string]interface{}{
		"outer":     "outer-value",
		"masked":    "masking-value",
		"inner":     "inner-value",
		"untouched": "stay-the-same",
	})

	templateRules := template.Rules{}
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		newNode := make(map[string]interface{})
		if nodeMap, ok := node.(map[string]interface{}); ok {
			if _, ok := node.(map[string]interface{})["untouched"]; ok {
				for key, value := range nodeMap {
					newValue, hasKey := stack.Get([]string{key})
					if hasKey {
						newNode[key] = newValue
					} else {
						newNode[key] = value
					}
				}
				return key, newNode
			}
		}

		return key, node
	})

	fnWith := MakeFnWith(&stack, &templateRules)
	newKey, newNode := fnWith([]interface{}{"x", "y"}, input)
	if newKey != "y" {
		t.Fatalf("FnWith modified the path (%v instead of %v)", newKey, "y")
	}

	if !reflect.DeepEqual(newNode, expected) {
		t.Fatalf("FnWith did not have the correct stack values during templateRule (%#v instead of %#v)",
			newNode,
			expected,
		)
	}
}

func main() {
	templateRules := template.Rules{}
	inputParameters := NewInputsFlag(&templateRules)
	var templateFilename string
	var outputWhat OutputWhatFlag

	flag.StringVar(&templateFilename,
		"template", "-",
		"CloudFormation Template to process")

	flag.Var(&inputParameters,
		"parameters",
		"File to use of input parameters (can be specified multiple times)")

	flag.Var(&outputWhat,
		"output",
		"What to output after processing the Template")

	flag.Parse()

	var jsonStream io.Reader
	var err error

	if templateFilename == "-" {
		jsonStream = os.Stdin
	} else if jsonStream, err = os.Open(templateFilename); err != nil {
		panic(err)
	}

	dec := json.NewDecoder(jsonStream)
	t := make(map[string]interface{})
	if err := dec.Decode(&t); err != nil {
		panic(err)
	}

	sources := fallbackmap.FallbackMap{}
	stack := deepstack.DeepStack{}

	sources.Attach(inputParameters.Get())
	sources.Attach(deepalias.DeepAlias{&stack})
	sources.Attach(deepcloudformationoutputs.NewDeepCloudFormationOutputs("eu-west-1"))
	sources.Attach(deepcloudformationresources.NewDeepCloudFormationResources("eu-west-1"))

	stack.Push(&sources)

	templateRules.AttachEarly(rules.ExcludeComments)
	templateRules.AttachEarly(rules.MakeFnFor(&stack, &templateRules))
	templateRules.AttachEarly(rules.MakeFnWith(&stack, &templateRules))
	templateRules.Attach(rules.FnAdd)
	templateRules.Attach(rules.FnIf)
	templateRules.Attach(rules.FnAnd)
	templateRules.Attach(rules.FnOr)
	templateRules.Attach(rules.FnNot)
	templateRules.Attach(rules.FnEquals)
	templateRules.Attach(rules.FnConcat)
	templateRules.Attach(rules.FnFromEntries)
	templateRules.Attach(rules.FnHasKey)
	templateRules.Attach(rules.FnJoin)
	templateRules.Attach(rules.FnKeys)
	templateRules.Attach(rules.FnLength)
	templateRules.Attach(rules.FnMerge)
	templateRules.Attach(rules.FnMergeDeep)
	templateRules.Attach(rules.FnMod)
	templateRules.Attach(rules.FnSplit)
	templateRules.Attach(rules.FnToEntries)
	templateRules.Attach(rules.FnUnique)
	templateRules.Attach(rules.MakeFnGetAtt(&stack, &templateRules))
	templateRules.Attach(rules.MakeRef(&stack, &templateRules))
	templateRules.Attach(rules.MakeFnHasRef(&stack))
	templateRules.Attach(rules.MakeFnIncludeFile(vfs.OS("/"), &templateRules))
	templateRules.Attach(rules.MakeFnIncludeFileRaw(vfs.OS("/")))
	templateRules.Attach(rules.ReduceConditions)

	// First Pass (to collect Parameter names)
	processed := template.Process(t, &templateRules)

	parameterRefs := map[string]interface{}{}
	if processedMap, ok := processed.(map[string]interface{}); ok {
		if processedParameters, ok := processedMap["Parameters"]; ok {
			if processedParametersMap, ok := processedParameters.(map[string]interface{}); ok {
				for parameterName, _ := range processedParametersMap {
					parameterRefs[parameterName] = map[string]interface{}{
						"ParamRef": parameterName,
					}
				}
			}
		}
	}

	stack.Push(fallbackmap.DeepMap(parameterRefs))
	templateRules.Attach(func(path []interface{}, node interface{}) (interface{}, interface{}) {
		key := interface{}(nil)
		if len(path) > 0 {
			key = path[len(path)-1]
		}

		if nodeMap, ok := node.(map[string]interface{}); !ok || len(nodeMap) != 1 {
			return key, node //passthru
		}

//.........這裏部分代碼省略.........