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521 lines (503 loc) · 14.5 KB
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// Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
package lambda
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"io/ioutil" //nolint: staticcheck
"reflect"
"strings"
"testing"
"time"
"github.com/aws/aws-lambda-go/lambda/handlertrace"
"github.com/aws/aws-lambda-go/lambda/messages"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestInvalidHandlers(t *testing.T) {
type valuer interface {
Value(key interface{}) interface{}
}
type customContext interface {
context.Context
MyCustomMethod()
}
type myContext interface {
Deadline() (deadline time.Time, ok bool)
Done() <-chan struct{}
Err() error
Value(key interface{}) interface{}
}
testCases := []struct {
name string
handler interface{}
expected error
}{
{
name: "nil handler",
expected: errors.New("handler is nil"),
handler: nil,
},
{
name: "handler is not a function",
expected: errors.New("handler kind struct is not func"),
handler: struct{}{},
},
{
name: "handler declares too many arguments",
expected: errors.New("handlers may not take more than two arguments, but handler takes 3"),
handler: func(n context.Context, x string, y string) error {
return nil
},
},
{
name: "two argument handler does not context as first argument",
expected: errors.New("handler takes two arguments, but the first is not Context. got string"),
handler: func(a string, x context.Context) error {
return nil
},
},
{
name: "handler returns too many values",
expected: errors.New("handler may not return more than two values"),
handler: func() (error, error, error) {
return nil, nil, nil
},
},
{
name: "handler returning two values does not declare error as the second return value",
expected: errors.New("handler returns two values, but the second does not implement error"),
//nolint: staticcheck
handler: func() (error, string) {
return nil, "hello"
},
},
{
name: "handler returning a single value does not implement error",
expected: errors.New("handler returns a single value, but it does not implement error"),
handler: func() string {
return "hello"
},
},
{
name: "no return value should not result in error",
expected: nil,
handler: func() {
},
},
{
name: "the handler takes the empty interface",
expected: nil,
handler: func(v interface{}) error {
if _, ok := v.(context.Context); ok {
return errors.New("v should not be a Context")
}
return nil
},
},
{
name: "the handler takes a subset of context.Context",
expected: errors.New("handler takes an interface, but it is not context.Context: \"valuer\""),
handler: func(ctx valuer) {
},
},
{
name: "the handler takes a same interface with context.Context",
expected: nil,
handler: func(ctx myContext) {
},
},
{
name: "the handler takes a superset of context.Context",
expected: errors.New("handler takes an interface, but it is not context.Context: \"customContext\""),
handler: func(ctx customContext) {
},
},
{
name: "the handler takes two arguments and first argument is a subset of context.Context",
expected: errors.New("handler takes two arguments, but the first is not Context. got interface"),
handler: func(ctx valuer, v interface{}) {
},
},
{
name: "the handler takes two arguments and first argument is a same interface with context.Context",
expected: nil,
handler: func(ctx myContext, v interface{}) {
},
},
{
name: "the handler takes two arguments and first argument is a superset of context.Context",
expected: errors.New("handler takes two arguments, but the first is not Context. got interface"),
handler: func(ctx customContext, v interface{}) {
},
},
}
for i, testCase := range testCases {
testCase := testCase
t.Run(fmt.Sprintf("testCase[%d] %s", i, testCase.name), func(t *testing.T) {
lambdaHandler := NewHandler(testCase.handler)
_, err := lambdaHandler.Invoke(context.TODO(), []byte("{}"))
assert.Equal(t, testCase.expected, err)
})
}
}
type arbitraryJSON struct {
json []byte
err error
}
func (a arbitraryJSON) MarshalJSON() ([]byte, error) {
return a.json, a.err
}
type staticHandler struct {
body []byte
}
func (h *staticHandler) Invoke(_ context.Context, _ []byte) ([]byte, error) {
return h.body, nil
}
type expected struct {
val string
err error
}
func TestInvokes(t *testing.T) {
hello := func(s string) string {
return fmt.Sprintf("Hello %s!", s)
}
hellop := func(s *string) *string {
v := hello(*s)
return &v
}
testCases := []struct {
name string
input string
expected expected
handler interface{}
options []Option
}{
{
input: `"Lambda"`,
expected: expected{`null`, nil},
handler: func(_ string) {},
},
{
input: `"Lambda"`,
expected: expected{`"Hello Lambda!"`, nil},
handler: func(name string) (string, error) {
return hello(name), nil
},
},
{
expected: expected{`"Hello No Value!"`, nil},
handler: func(ctx context.Context) (string, error) {
return hello("No Value"), nil
},
},
{
input: `"Lambda"`,
expected: expected{`"Hello Lambda!"`, nil},
handler: func(ctx context.Context, name string) (string, error) {
return hello(name), nil
},
},
{
input: `"Lambda"`,
expected: expected{`"Hello Lambda!"`, nil},
handler: func(name *string) (*string, error) {
return hellop(name), nil
},
},
{
input: `"Lambda"`,
expected: expected{`"Hello Lambda!"`, nil},
handler: func(name *string) (*string, error) {
return hellop(name), nil
},
},
{
input: `"Lambda"`,
expected: expected{`"Hello Lambda!"`, nil},
handler: func(ctx context.Context, name *string) (*string, error) {
return hellop(name), nil
},
},
{
input: `"Lambda"`,
expected: expected{"", errors.New("bad stuff")},
handler: func() error {
return errors.New("bad stuff")
},
},
{
input: `"Lambda"`,
expected: expected{"", errors.New("bad stuff")},
handler: func() (interface{}, error) {
return nil, errors.New("bad stuff")
},
},
{
input: `"Lambda"`,
expected: expected{"", errors.New("bad stuff")},
handler: func(e interface{}) (interface{}, error) {
return nil, errors.New("bad stuff")
},
},
{
input: `"Lambda"`,
expected: expected{"", errors.New("bad stuff")},
handler: func(ctx context.Context, e interface{}) (interface{}, error) {
return nil, errors.New("bad stuff")
},
},
{
name: "basic input struct serialization",
input: `{"custom":9001}`,
expected: expected{`9001`, nil},
handler: func(event struct{ Custom int }) (int, error) {
return event.Custom, nil
},
},
{
name: "basic output struct serialization",
input: `9001`,
expected: expected{`{"Number":9001}`, nil},
handler: func(event int) (struct{ Number int }, error) {
return struct{ Number int }{event}, nil
},
},
{
input: `"Lambda"`,
expected: expected{"", messages.InvokeResponse_Error{Message: "message", Type: "type"}},
handler: func(e interface{}) (interface{}, error) {
return nil, messages.InvokeResponse_Error{Message: "message", Type: "type"}
},
},
{
name: "WithSetEscapeHTML(false)",
expected: expected{`"<html><body>html in json string!</body></html>"`, nil},
handler: func() (string, error) {
return "<html><body>html in json string!</body></html>", nil
},
options: []Option{WithSetEscapeHTML(false)},
},
{
name: "WithSetEscapeHTML(true)",
expected: expected{`"\u003chtml\u003e\u003cbody\u003ehtml in json string!\u003c/body\u003e\u003c/html\u003e"`, nil},
handler: func() (string, error) {
return "<html><body>html in json string!</body></html>", nil
},
options: []Option{WithSetEscapeHTML(true)},
},
{
name: `WithSetIndent(">>", " ")`,
expected: expected{"{\n>> \"Foo\": \"Bar\"\n>>}\n", nil},
handler: func() (interface{}, error) {
return struct{ Foo string }{"Bar"}, nil
},
options: []Option{WithSetIndent(">>", " ")},
},
{
name: "WithUseNumber(true) results in json.Number instead of float64 when decoding to an interface{}",
input: `19.99`,
expected: expected{`"Number"`, nil},
handler: func(event interface{}) (string, error) {
return reflect.TypeOf(event).Name(), nil
},
options: []Option{WithUseNumber(true)},
},
{
name: "WithUseNumber(false)",
input: `19.99`,
expected: expected{`"float64"`, nil},
handler: func(event interface{}) (string, error) {
return reflect.TypeOf(event).Name(), nil
},
options: []Option{WithUseNumber(false)},
},
{
name: "No decoder options provided is the same as WithUseNumber(false)",
input: `19.99`,
expected: expected{`"float64"`, nil},
handler: func(event interface{}) (string, error) {
return reflect.TypeOf(event).Name(), nil
},
options: []Option{},
},
{
name: "WithDisallowUnknownFields(true)",
input: `{"Hello": "World"}`,
expected: expected{"", errors.New(`json: unknown field "Hello"`)},
handler: func(_ struct{}) {},
options: []Option{WithDisallowUnknownFields(true)},
},
{
name: "WithDisallowUnknownFields(false)",
input: `{"Hello": "World"}`,
expected: expected{`null`, nil},
handler: func(_ struct{}) {},
options: []Option{WithDisallowUnknownFields(false)},
},
{
name: "No decoder options provided is the same as WithDisallowUnknownFields(false)",
input: `{"Hello": "World"}`,
expected: expected{`null`, nil},
handler: func(_ struct{}) {},
options: []Option{},
},
{
name: "bytes are base64 encoded strings",
input: `"aGVsbG8="`,
expected: expected{`"aGVsbG95b2xv"`, nil},
handler: func(_ context.Context, req []byte) ([]byte, error) {
return append(req, []byte("yolo")...), nil
},
},
{
name: "Handler interface implementations are passthrough",
expected: expected{`<xml>hello</xml>`, nil},
handler: &staticHandler{body: []byte(`<xml>hello</xml>`)},
},
{
name: "io.Reader responses are passthrough",
expected: expected{`<yolo>yolo</yolo>`, nil},
handler: func() (io.Reader, error) {
return strings.NewReader(`<yolo>yolo</yolo>`), nil
},
},
{
name: "io.Reader responses that are byte buffers are passthrough",
expected: expected{`<yolo>yolo</yolo>`, nil},
handler: func() (*bytes.Buffer, error) {
return bytes.NewBuffer([]byte(`<yolo>yolo</yolo>`)), nil
},
},
{
name: "io.Reader responses that are also json serializable, handler returns the json, ignoring the reader",
expected: expected{`{"Yolo":"yolo"}`, nil},
handler: func() (io.Reader, error) {
return struct {
io.Reader `json:"-"`
Yolo string
}{
Reader: strings.NewReader(`<yolo>yolo</yolo>`),
Yolo: "yolo",
}, nil
},
},
{
name: "types that are not json serializable result in an error",
expected: expected{``, errors.New("json: error calling MarshalJSON for type struct { lambda.arbitraryJSON }: barf")},
handler: func() (interface{}, error) {
return struct {
arbitraryJSON
}{
arbitraryJSON{nil, errors.New("barf")},
}, nil
},
},
{
name: "io.Reader responses that not json serializable remain passthrough",
expected: expected{`wat`, nil},
handler: func() (io.Reader, error) {
return struct {
arbitraryJSON
io.Reader
}{
arbitraryJSON{nil, errors.New("barf")},
strings.NewReader("wat"),
}, nil
},
},
}
for i, testCase := range testCases {
testCase := testCase
t.Run(fmt.Sprintf("testCase[%d] %s", i, testCase.name), func(t *testing.T) {
lambdaHandler := newHandler(testCase.handler, testCase.options...)
t.Run("via Handler.Invoke", func(t *testing.T) {
response, err := lambdaHandler.Invoke(context.TODO(), []byte(testCase.input))
if testCase.expected.err != nil {
assert.EqualError(t, err, testCase.expected.err.Error())
} else {
assert.NoError(t, err)
assert.Equal(t, testCase.expected.val, string(response))
}
})
t.Run("via handlerOptions.handlerFunc", func(t *testing.T) {
response, err := lambdaHandler.handlerFunc(context.TODO(), []byte(testCase.input))
if testCase.expected.err != nil {
assert.EqualError(t, err, testCase.expected.err.Error())
} else {
assert.NoError(t, err)
require.NotNil(t, response)
responseBytes, err := ioutil.ReadAll(response)
assert.NoError(t, err)
assert.Equal(t, testCase.expected.val, string(responseBytes))
}
})
})
}
}
func TestInvalidJsonInput(t *testing.T) {
lambdaHandler := NewHandler(func(s string) error { return nil })
_, err := lambdaHandler.Invoke(context.TODO(), []byte(`{"invalid json`))
assert.Equal(t, "unexpected EOF", err.Error())
}
func TestHandlerTrace(t *testing.T) {
handler := NewHandler(func(ctx context.Context, x int) (int, error) {
if x != 123 {
t.Error(x)
}
return 456, nil
})
requestHistory := ""
responseHistory := ""
checkInt := func(e interface{}, expected int) {
nt, ok := e.(int)
if !ok {
t.Error("not int as expected", e)
return
}
if nt != expected {
t.Error("unexpected value", nt, expected)
}
}
ctx := context.Background()
ctx = handlertrace.NewContext(ctx, handlertrace.HandlerTrace{}) // empty HandlerTrace
ctx = handlertrace.NewContext(ctx, handlertrace.HandlerTrace{ // with RequestEvent
RequestEvent: func(c context.Context, e interface{}) {
requestHistory += "A"
checkInt(e, 123)
},
})
ctx = handlertrace.NewContext(ctx, handlertrace.HandlerTrace{ // with ResponseEvent
ResponseEvent: func(c context.Context, e interface{}) {
responseHistory += "X"
checkInt(e, 456)
},
})
ctx = handlertrace.NewContext(ctx, handlertrace.HandlerTrace{ // with RequestEvent and ResponseEvent
RequestEvent: func(c context.Context, e interface{}) {
requestHistory += "B"
checkInt(e, 123)
},
ResponseEvent: func(c context.Context, e interface{}) {
responseHistory += "Y"
checkInt(e, 456)
},
})
ctx = handlertrace.NewContext(ctx, handlertrace.HandlerTrace{}) // empty HandlerTrace
payload := []byte(`123`)
js, err := handler.Invoke(ctx, payload)
if err != nil {
t.Error("unexpected handler error", err)
}
if string(js) != "456" {
t.Error("unexpected handler output", string(js))
}
if requestHistory != "AB" {
t.Error("request callbacks not called as expected", requestHistory)
}
if responseHistory != "XY" {
t.Error("response callbacks not called as expected", responseHistory)
}
}
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