wa-lang.org/wazero@v1.0.2/experimental/logging/log_listener_test.go

package logging_test

import (
	"bytes"
	"context"
	"io"
	"math"
	"testing"

	"wa-lang.org/wazero/api"
	"wa-lang.org/wazero/experimental/logging"
	"wa-lang.org/wazero/imports/wasi_snapshot_preview1"
	"wa-lang.org/wazero/internal/testing/require"
	"wa-lang.org/wazero/internal/wasm"
)

// testCtx is an arbitrary, non-default context. Non-nil also prevents linter errors.
var testCtx = context.WithValue(context.Background(), struct{}{}, "arbitrary")

func Test_loggingListener(t *testing.T) {
	wasiFuncName := "random_get"
	wasiFuncType := &wasm.FunctionType{
		Params:  []api.ValueType{api.ValueTypeI32, api.ValueTypeI32},
		Results: []api.ValueType{api.ValueTypeI32, api.ValueTypeI32},
	}
	wasiParamNames := []string{"buf", "buf_len"}
	wasiParams := []uint64{0, 8}

	tests := []struct {
		name                 string
		moduleName, funcName string
		functype             *wasm.FunctionType
		isHostFunc           bool
		paramNames           []string
		params, results      []uint64
		err                  error
		expected             string
	}{
		{
			name:     "v_v",
			functype: &wasm.FunctionType{},
			expected: `--> test.fn()
<-- ()
`,
		},
		{
			name:     "error",
			functype: &wasm.FunctionType{},
			err:      io.EOF,
			expected: `--> test.fn()
<-- error: EOF
`,
		},
		{
			name:       "host",
			functype:   &wasm.FunctionType{},
			isHostFunc: true,
			expected: `==> test.fn()
<== ()
`,
		},
		{
			name:       "wasi",
			functype:   wasiFuncType,
			moduleName: wasi_snapshot_preview1.ModuleName,
			funcName:   wasiFuncName,
			paramNames: wasiParamNames,
			isHostFunc: true,
			params:     wasiParams,
			results:    []uint64{uint64(wasi_snapshot_preview1.ErrnoSuccess)},
			expected: `==> wasi_snapshot_preview1.random_get(buf=0,buf_len=8)
<== ESUCCESS
`,
		},
		{
			name:       "wasi errno",
			functype:   wasiFuncType,
			moduleName: wasi_snapshot_preview1.ModuleName,
			funcName:   wasiFuncName,
			paramNames: wasiParamNames,
			isHostFunc: true,
			params:     wasiParams,
			results:    []uint64{uint64(wasi_snapshot_preview1.ErrnoFault)},
			expected: `==> wasi_snapshot_preview1.random_get(buf=0,buf_len=8)
<== EFAULT
`,
		},
		{
			name:       "wasi error",
			functype:   wasiFuncType,
			moduleName: wasi_snapshot_preview1.ModuleName,
			funcName:   wasiFuncName,
			paramNames: wasiParamNames,
			isHostFunc: true,
			params:     wasiParams,
			err:        io.EOF, // not possible as we coerce errors to numbers, but test anyway!
			expected: `==> wasi_snapshot_preview1.random_get(buf=0,buf_len=8)
<== error: EOF
`,
		},
		{
			name:     "i32",
			functype: &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeI32}},
			params:   []uint64{math.MaxUint32},
			expected: `--> test.fn(4294967295)
<-- ()
`,
		},
		{
			name:       "i32 named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeI32}},
			params:     []uint64{math.MaxUint32},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=4294967295)
<-- ()
`,
		},
		{
			name:     "i64",
			functype: &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeI64}},
			params:   []uint64{math.MaxUint64},
			expected: `--> test.fn(18446744073709551615)
<-- ()
`,
		},
		{
			name:       "i64 named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeI64}},
			params:     []uint64{math.MaxUint64},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=18446744073709551615)
<-- ()
`,
		},
		{
			name:     "f32",
			functype: &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeF32}},
			params:   []uint64{api.EncodeF32(math.MaxFloat32)},
			expected: `--> test.fn(3.4028235e+38)
<-- ()
`,
		},
		{
			name:       "f32 named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeF32}},
			params:     []uint64{api.EncodeF32(math.MaxFloat32)},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=3.4028235e+38)
<-- ()
`,
		},
		{
			name:     "f64",
			functype: &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeF64}},
			params:   []uint64{api.EncodeF64(math.MaxFloat64)},
			expected: `--> test.fn(1.7976931348623157e+308)
<-- ()
`,
		},
		{
			name:       "f64 named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeF64}},
			params:     []uint64{api.EncodeF64(math.MaxFloat64)},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=1.7976931348623157e+308)
<-- ()
`,
		},
		{
			name:     "externref",
			functype: &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeExternref}},
			params:   []uint64{0},
			expected: `--> test.fn(0000000000000000)
<-- ()
`,
		},
		{
			name:       "externref named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{api.ValueTypeExternref}},
			params:     []uint64{0},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=0000000000000000)
<-- ()
`,
		},
		{
			name:     "v128",
			functype: &wasm.FunctionType{Params: []api.ValueType{0x7b}},
			params:   []uint64{0, 1},
			expected: `--> test.fn(00000000000000000000000000000001)
<-- ()
`,
		},
		{
			name:       "v128 named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{0x7b}},
			params:     []uint64{0, 1},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=00000000000000000000000000000001)
<-- ()
`,
		},
		{
			name:     "funcref",
			functype: &wasm.FunctionType{Params: []api.ValueType{0x70}},
			params:   []uint64{0},
			expected: `--> test.fn(0000000000000000)
<-- ()
`,
		},
		{
			name:       "funcref named",
			functype:   &wasm.FunctionType{Params: []api.ValueType{0x70}},
			params:     []uint64{0},
			paramNames: []string{"x"},
			expected: `--> test.fn(x=0000000000000000)
<-- ()
`,
		},
		{
			name:     "no params, one result",
			functype: &wasm.FunctionType{Results: []api.ValueType{api.ValueTypeI32}},
			results:  []uint64{math.MaxUint32},
			expected: `--> test.fn()
<-- (4294967295)
`,
		},
		{
			name: "one param, one result",
			functype: &wasm.FunctionType{
				Params:  []api.ValueType{api.ValueTypeI32},
				Results: []api.ValueType{api.ValueTypeF32},
			},
			params:  []uint64{math.MaxUint32},
			results: []uint64{api.EncodeF32(math.MaxFloat32)},
			expected: `--> test.fn(4294967295)
<-- (3.4028235e+38)
`,
		},
		{
			name: "two params, two results",
			functype: &wasm.FunctionType{
				Params:  []api.ValueType{api.ValueTypeI32, api.ValueTypeI64},
				Results: []api.ValueType{api.ValueTypeF32, api.ValueTypeF64},
			},
			params:  []uint64{math.MaxUint32, math.MaxUint64},
			results: []uint64{api.EncodeF32(math.MaxFloat32), api.EncodeF64(math.MaxFloat64)},
			expected: `--> test.fn(4294967295,18446744073709551615)
<-- (3.4028235e+38,1.7976931348623157e+308)
`,
		},
		{
			name: "two params, two results named",
			functype: &wasm.FunctionType{
				Params:  []api.ValueType{api.ValueTypeI32, api.ValueTypeI64},
				Results: []api.ValueType{api.ValueTypeF32, api.ValueTypeF64},
			},
			params:     []uint64{math.MaxUint32, math.MaxUint64},
			paramNames: []string{"x", "y"},
			results:    []uint64{api.EncodeF32(math.MaxFloat32), api.EncodeF64(math.MaxFloat64)},
			expected: `--> test.fn(x=4294967295,y=18446744073709551615)
<-- (3.4028235e+38,1.7976931348623157e+308)
`,
		},
	}

	var out bytes.Buffer
	lf := logging.NewLoggingListenerFactory(&out)
	fn := func() {}
	for _, tt := range tests {
		tc := tt
		t.Run(tc.name, func(t *testing.T) {
			if tc.moduleName == "" {
				tc.moduleName = "test"
			}
			if tc.funcName == "" {
				tc.funcName = "fn"
			}
			m := &wasm.Module{
				TypeSection:     []*wasm.FunctionType{tc.functype},
				FunctionSection: []wasm.Index{0},
				NameSection: &wasm.NameSection{
					ModuleName:    tc.moduleName,
					FunctionNames: wasm.NameMap{{Name: tc.funcName}},
					LocalNames:    wasm.IndirectNameMap{{NameMap: toNameMap(tc.paramNames)}},
				},
			}

			if tc.isHostFunc {
				m.CodeSection = []*wasm.Code{wasm.MustParseGoReflectFuncCode(fn)}
			} else {
				m.CodeSection = []*wasm.Code{{Body: []byte{wasm.OpcodeEnd}}}
			}
			m.BuildFunctionDefinitions()
			def := m.FunctionDefinitionSection[0]
			l := lf.NewListener(m.FunctionDefinitionSection[0])

			out.Reset()
			ctx := l.Before(testCtx, def, tc.params)
			l.After(ctx, def, tc.err, tc.results)
			require.Equal(t, tc.expected, out.String())
		})
	}
}

func toNameMap(names []string) wasm.NameMap {
	if len(names) == 0 {
		return nil
	}
	var ret wasm.NameMap
	for i, n := range names {
		ret = append(ret, &wasm.NameAssoc{Index: wasm.Index(i), Name: n})
	}
	return ret
}

func Test_loggingListener_indentation(t *testing.T) {
	out := bytes.NewBuffer(nil)
	lf := logging.NewLoggingListenerFactory(out)
	m := &wasm.Module{
		TypeSection:     []*wasm.FunctionType{{}},
		FunctionSection: []wasm.Index{0, 0},
		CodeSection:     []*wasm.Code{{Body: []byte{wasm.OpcodeEnd}}, {Body: []byte{wasm.OpcodeEnd}}},
		NameSection: &wasm.NameSection{
			ModuleName:    "test",
			FunctionNames: wasm.NameMap{{Index: 0, Name: "fn1"}, {Index: 1, Name: "fn2"}},
		},
	}
	m.BuildFunctionDefinitions()
	def1 := m.FunctionDefinitionSection[0]
	l1 := lf.NewListener(def1)
	def2 := m.FunctionDefinitionSection[1]
	l2 := lf.NewListener(def2)

	ctx := l1.Before(testCtx, def1, []uint64{})
	ctx1 := l2.Before(ctx, def2, []uint64{})
	l2.After(ctx1, def2, nil, []uint64{})
	l1.After(ctx, def1, nil, []uint64{})
	require.Equal(t, `--> test.fn1()
	--> test.fn2()
	<-- ()
<-- ()
`, out.String())
}