feat(validation): add generic validator framework

go.mod

@@ -19,6 +19,8 @@ require (
 	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
 	github.com/Microsoft/go-winio v0.5.2 // indirect
 	github.com/Microsoft/hcsshim v0.9.3 // indirect
+	github.com/PaesslerAG/gval v1.0.0 // indirect
+	github.com/PaesslerAG/jsonpath v0.1.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.1.3 // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/containerd/cgroups v1.0.4 // indirect

go.sum

@@ -66,6 +66,11 @@ github.com/Microsoft/hcsshim/test v0.0.0-20201218223536-d3e5debf77da/go.mod h1:5
 github.com/Microsoft/hcsshim/test v0.0.0-20210227013316-43a75bb4edd3/go.mod h1:mw7qgWloBUl75W/gVH3cQszUg1+gUITj7D6NY7ywVnY=
 github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/PaesslerAG/gval v1.0.0 h1:GEKnRwkWDdf9dOmKcNrar9EA1bz1z9DqPIO1+iLzhd8=
+github.com/PaesslerAG/gval v1.0.0/go.mod h1:y/nm5yEyTeX6av0OfKJNp9rBNj2XrGhAf5+v24IBN1I=
+github.com/PaesslerAG/jsonpath v0.1.0/go.mod h1:4BzmtoM/PI8fPO4aQGIusjGxGir2BzcV0grWtFzq1Y8=
+github.com/PaesslerAG/jsonpath v0.1.1 h1:c1/AToHQMVsduPAa4Vh6xp2U0evy4t8SWp8imEsylIk=
+github.com/PaesslerAG/jsonpath v0.1.1/go.mod h1:lVboNxFGal/VwW6d9JzIy56bUsYAP6tH/x80vjnCseY=
 github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=

grammar/param.go

@@ -11,12 +11,37 @@ func ValidateParameterCount(params []Param, expected int) error {
 	return nil
 }
 
+type ParamType uint8
+
+const (
+	ParamTypeUnknown ParamType = iota
+	ParamTypeString
+	ParamTypeInt
+	ParamTypeFloat
+)
+
 type Param struct {
 	String *string  `parser:"@String | @RawString"`
 	Int    *int     `parser:"| @Int"`
 	Float  *float64 `parser:"| @Float"`
 }
 
+func (p Param) Type() ParamType {
+	if p.String != nil {
+		return ParamTypeString
+	}
+
+	if p.Int != nil {
+		return ParamTypeInt
+	}
+
+	if p.Float != nil {
+		return ParamTypeFloat
+	}
+
+	return ParamTypeUnknown
+}
+
 func (p Param) AsString() (string, error) {
 	if p.String == nil {
 		return "", fmt.Errorf("string is nil %w", ErrTypeMismatch)

protocols/redis/checks_test.go

@@ -37,7 +37,7 @@ func TestChecks_Execute(t *testing.T) {
 		},
 		{
 			name:  "Get value - validate value",
-			check: `redis.GET("%s", "some_key") => String("some_value")`,
+			check: `redis.GET("%s", "some_key") => Equals("some_value")`,
 			setup: func(tb testing.TB, cli redisCli.UniversalClient) {
 				tb.Helper()
 				td.CmpNoError(tb, cli.Set(context.Background(), "some_key", "some_value", 0).Err())

protocols/redis/ping.go

@@ -38,7 +38,8 @@ func (p *PingCheck) UnmarshalCheck(c grammar.Check, lookup config.ServerLookup)
 		serverAndMessageArgCount = 2
 	)
 
-	p.validators = append(p.validators, StringCmdValidator("PONG"))
+	val, _ := GenericCommandValidatorFor("PONG")
+	p.validators = append(p.validators, val)
 
 	init := c.Initiator
 	switch len(init.Params) {
@@ -48,7 +49,8 @@ func (p *PingCheck) UnmarshalCheck(c grammar.Check, lookup config.ServerLookup)
 		if msg, err := init.Params[1].AsString(); err != nil {
 			return err
 		} else {
-			p.validators = ValidationChain{StringCmdValidator(msg)}
+			val, _ := GenericCommandValidatorFor(msg)
+			p.validators = ValidationChain{val}
 		}
 		fallthrough
 	case serverOnlyArgCount:

protocols/redis/validation.go

@@ -9,17 +9,18 @@ import (
 
 	"github.com/baez90/nurse/check"
 	"github.com/baez90/nurse/grammar"
+	"github.com/baez90/nurse/validation"
 )
 
 var (
 	ErrNoSuchValidator = errors.New("no such validator")
 
 	_ CmdValidator = (ValidationChain)(nil)
-	_ CmdValidator = (*StringCmdValidator)(nil)
+	_ CmdValidator = (*GenericCmdValidator)(nil)
 
 	knownValidators = map[string]func() unmarshallableCmdValidator{
-		"string": func() unmarshallableCmdValidator {
+		"equals": func() unmarshallableCmdValidator {
-			return new(StringCmdValidator)
+			return new(GenericCmdValidator)
 		},
 	}
 )
@@ -71,33 +72,61 @@ func (v ValidationChain) Validate(cmder redis.Cmder) error {
 	return nil
 }
 
-type StringCmdValidator string
+func GenericCommandValidatorFor[T validation.Value](want T) (*GenericCmdValidator, error) {
+	comparator, err := validation.JSONValueComparatorFor(want)
+	if err != nil {
+		return nil, err
+	}
+	return &GenericCmdValidator{
+		comparator: comparator,
+	}, nil
+}
 
-func (s *StringCmdValidator) UnmarshalCall(c grammar.Call) error {
+type GenericCmdValidator struct {
+	comparator validation.ValueComparator
+}
+
+func (g *GenericCmdValidator) UnmarshalCall(c grammar.Call) error {
 	if err := grammar.ValidateParameterCount(c.Params, 1); err != nil {
 		return err
 	}
 
-	want, err := c.Params[0].AsString()
+	var err error
-	if err != nil {
+
-		return err
+	switch c.Params[0].Type() {
+	case grammar.ParamTypeInt:
+		if g.comparator, err = validation.JSONValueComparatorFor(*c.Params[0].Int); err != nil {
+			return err
+		}
+	case grammar.ParamTypeFloat:
+		if g.comparator, err = validation.JSONValueComparatorFor(*c.Params[0].Float); err != nil {
+			return err
+		}
+	case grammar.ParamTypeString:
+		if g.comparator, err = validation.JSONValueComparatorFor(*c.Params[0].String); err != nil {
+			return err
+		}
+	default:
+		return fmt.Errorf("param type is unkown")
 	}
 
-	*s = StringCmdValidator(want)
 	return nil
 }
 
-func (s StringCmdValidator) Validate(cmder redis.Cmder) error {
+func (g GenericCmdValidator) Validate(cmder redis.Cmder) error {
 	if err := cmder.Err(); err != nil {
 		return err
 	}
 
-	if stringCmd, ok := cmder.(*redis.StringCmd); !ok {
+	switch in := cmder.(type) {
-		return errors.New("not a string result")
+	case *redis.StringCmd:
-	} else if got, err := stringCmd.Result(); err != nil {
+		res, err := in.Result()
-		return err
+		if err != nil {
-	} else if want := string(s); got != want {
+			return err
-		return fmt.Errorf("want %s but got %s", want, got)
+		}
+		if !g.comparator.Equals(res) {
+			return fmt.Errorf("got %s - but didn't match expected value", res)
+		}
 	}
 
 	return nil

validation/comparator.go

@@ -0,0 +1,39 @@
+package validation
+
+import "math"
+
+const equalityThreshold = 0.00000001
+
+var (
+	_ ValueComparator = (*GenericComparator[int])(nil)
+	_ ValueComparator = FloatComparator(0)
+)
+
+type ValueComparator interface {
+	Equals(got any) bool
+}
+
+type GenericComparator[T int | string] struct {
+	Want   T
+	Parser func(got any) (T, error)
+}
+
+func (g GenericComparator[T]) Equals(got any) bool {
+	parsed, err := g.Parser(got)
+	if err != nil {
+		return false
+	}
+
+	return parsed == g.Want
+}
+
+type FloatComparator float64
+
+func (f FloatComparator) Equals(got any) bool {
+	val, err := ParseJSONFloat(got)
+	if err != nil {
+		return false
+	}
+
+	return math.Abs(float64(f)-val) < equalityThreshold
+}

validation/conversion.go

@@ -0,0 +1,43 @@
+package validation
+
+func ToFloat64(val any) float64 {
+	switch i := val.(type) {
+	case float64:
+		return i
+	case float32:
+		return float64(i)
+	default:
+		return 0
+	}
+}
+
+func ToInt(val any) int {
+	switch i := val.(type) {
+	case int:
+		return i
+	case int8:
+		return int(i)
+	case int16:
+		return int(i)
+	case int32:
+		return int(i)
+	case int64:
+		return int(i)
+	case uint:
+		return int(i)
+	case uint8:
+		return int(i)
+	case uint16:
+		return int(i)
+	case uint32:
+		return int(i)
+	case uint64:
+		return int(i)
+	case float32:
+		return int(i)
+	case float64:
+		return int(i)
+	default:
+		return 0
+	}
+}

validation/json_parsing.go

@@ -0,0 +1,76 @@
+package validation
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+func ParseJSONInt(got any) (int, error) {
+	switch in := got.(type) {
+	case float32, float64:
+		return ToInt(in), nil
+	case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
+		return ToInt(got), nil
+	case []byte:
+		var val json.Number
+		if err := json.Unmarshal(in, &val); err != nil {
+			return 0, err
+		}
+		if i, err := val.Int64(); err != nil {
+			return 0, err
+		} else {
+			return int(i), nil
+		}
+	case string:
+		var val json.Number
+		if err := json.Unmarshal([]byte(in), &val); err != nil {
+			return 0, err
+		}
+		if i, err := val.Int64(); err != nil {
+			return 0, err
+		} else {
+			return int(i), nil
+		}
+	default:
+		return 0, fmt.Errorf("cannot convert value %v to int", got)
+	}
+}
+
+func ParseJSONFloat(got any) (float64, error) {
+	switch in := got.(type) {
+	case float32:
+		return float64(in), nil
+	case float64:
+		return in, nil
+	case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
+		i := got.(int)
+		return float64(i), nil
+	case []byte:
+		var val json.Number
+		if err := json.Unmarshal(in, &val); err != nil {
+			return 0, err
+		}
+		return val.Float64()
+	case string:
+		var val json.Number
+		if err := json.Unmarshal([]byte(in), &val); err != nil {
+			return 0, err
+		}
+		return val.Float64()
+	default:
+		return 0, fmt.Errorf("cannot convert value %v to float", got)
+	}
+}
+
+func ParseJSONString(got any) (string, error) {
+	switch in := got.(type) {
+	case float32, float64, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
+		return fmt.Sprintf("%v", in), nil
+	case []byte:
+		return string(in), nil
+	case string:
+		return in, nil
+	default:
+		return "", fmt.Errorf("cannot convert value %v to float", got)
+	}
+}

validation/jsonpath.go

@@ -0,0 +1,65 @@
+package validation
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/PaesslerAG/jsonpath"
+)
+
+var _ ValueComparator = (*JSONPathValidator)(nil)
+
+func JSONPathValidatorFor[T Value](path string, want T) (*JSONPathValidator, error) {
+	comparator, err := JSONValueComparatorFor(want)
+	if err != nil {
+		return nil, err
+	}
+
+	return &JSONPathValidator{
+		Path:       path,
+		Comparator: comparator,
+	}, nil
+}
+
+type JSONPathValidator struct {
+	Path       string
+	Comparator ValueComparator
+}
+
+func (j JSONPathValidator) Equals(got any) bool {
+	parsed, err := parse(got)
+	if err != nil {
+		return false
+	}
+	val, err := jsonpath.Get(j.Path, parsed)
+	if err != nil {
+		return false
+	}
+
+	return j.Comparator.Equals(val)
+}
+
+func parse(in any) (any, error) {
+	keyValue := make(map[string]any)
+	arr := make([]any, 0)
+	switch data := in.(type) {
+	case []byte:
+		if err := json.Unmarshal(data, &keyValue); err == nil {
+			return keyValue, nil
+		}
+
+		err := json.Unmarshal(data, &arr)
+
+		return arr, err
+	case string:
+		raw := []byte(data)
+		if err := json.Unmarshal(raw, &keyValue); err == nil {
+			return keyValue, nil
+		}
+		err := json.Unmarshal(raw, &arr)
+
+		return arr, err
+	}
+
+	return nil, fmt.Errorf("cannot convert %v to JSON structure", in)
+}

validation/jsonpath_test.go

@@ -0,0 +1,85 @@
+package validation_test
+
+import (
+	"testing"
+
+	"github.com/baez90/nurse/validation"
+)
+
+type jsonPathValidator_EqualsTestCase[V validation.Value] struct {
+	testName string
+	expected V
+	jsonPath string
+	json     string
+	want     bool
+}
+
+func (tt jsonPathValidator_EqualsTestCase[V]) name() string {
+	return tt.testName
+}
+
+func (tt jsonPathValidator_EqualsTestCase[V]) run(t *testing.T) {
+	t.Parallel()
+	t.Helper()
+	validator, err := validation.JSONPathValidatorFor(tt.jsonPath, tt.expected)
+	if err != nil {
+		t.Fatalf("JSONPathValidatorFor() err = %v", err)
+	}
+
+	if validator.Equals(tt.json) != tt.want {
+		t.Errorf("Failed to equal value in %s to %v", tt.json, tt.expected)
+	}
+}
+
+func TestJSONPathValidator_Equals(t *testing.T) {
+	t.Parallel()
+	tests := []testCase{
+		jsonPathValidator_EqualsTestCase[string]{
+			testName: "Simple object navigation",
+			expected: "hello",
+			jsonPath: "$.greeting",
+			json:     `{"greeting": "hello"}`,
+			want:     true,
+		},
+		jsonPathValidator_EqualsTestCase[string]{
+			testName: "Simple object navigation - number as string",
+			expected: "42",
+			jsonPath: "$.number",
+			json:     `{"number": 42}`,
+			want:     true,
+		},
+		jsonPathValidator_EqualsTestCase[string]{
+			testName: "Simple array navigation",
+			expected: "world",
+			jsonPath: "$[1]",
+			json:     `["hello", "world"]`,
+			want:     true,
+		},
+		jsonPathValidator_EqualsTestCase[int]{
+			testName: "Simple array navigation - string to int",
+			expected: 37,
+			jsonPath: "$[1]",
+			json:     `["13", "37"]`,
+			want:     true,
+		},
+		jsonPathValidator_EqualsTestCase[int]{
+			testName: "Simple array navigation - string to int - wrong value",
+			expected: 42,
+			jsonPath: "$[1]",
+			json:     `["13", "37"]`,
+			want:     false,
+		},
+		jsonPathValidator_EqualsTestCase[string]{
+			testName: "Simple array navigation - int to string",
+			expected: "37",
+			jsonPath: "$[1]",
+			json:     `[13, 37]`,
+			want:     true,
+		},
+	}
+	//nolint:paralleltest
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name(), tt.run)
+	}
+}

validation/jsonval.go

@@ -0,0 +1,52 @@
+package validation
+
+import (
+	"fmt"
+)
+
+var _ ValueComparator = (*JSONValueComparator)(nil)
+
+type Value interface {
+	float32 | float64 | int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 | uint64 | string | []byte
+}
+
+func JSONValueComparatorFor[T Value](want T) (*JSONValueComparator, error) {
+	ti := any(want)
+	switch in := ti.(type) {
+	case float32, float64:
+		return &JSONValueComparator{
+			Comparator: FloatComparator(ToFloat64(in)),
+		}, nil
+	case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
+		return &JSONValueComparator{
+			Comparator: GenericComparator[int]{
+				Want:   ToInt(in),
+				Parser: ParseJSONInt,
+			},
+		}, nil
+	case string:
+		return &JSONValueComparator{
+			Comparator: GenericComparator[string]{
+				Want:   in,
+				Parser: ParseJSONString,
+			},
+		}, nil
+	case []byte:
+		return &JSONValueComparator{
+			Comparator: GenericComparator[string]{
+				Want:   string(in),
+				Parser: ParseJSONString,
+			},
+		}, nil
+	default:
+		return nil, fmt.Errorf("no matching type detected for %v", want)
+	}
+}
+
+type JSONValueComparator struct {
+	Comparator ValueComparator
+}
+
+func (j JSONValueComparator) Equals(got any) bool {
+	return j.Comparator.Equals(got)
+}

validation/jsonval_test.go

@@ -0,0 +1,180 @@
+package validation_test
+
+import (
+	"testing"
+
+	"github.com/baez90/nurse/validation"
+)
+
+type testCase interface {
+	run(t *testing.T)
+	name() string
+}
+
+type jsonValueComparator_EqualsTestCase[V validation.Value] struct {
+	testName string
+	expected V
+	got      any
+	want     bool
+}
+
+func (tt jsonValueComparator_EqualsTestCase[V]) run(t *testing.T) {
+	t.Parallel()
+	t.Helper()
+	comparator, err := validation.JSONValueComparatorFor(tt.expected)
+	if err != nil {
+		t.Fatalf("validation.JSONValueComparatorFor() err = %v", err)
+	}
+
+	if got := comparator.Equals(tt.got); got != tt.want {
+		t.Errorf("Equals() = %v, want %v", got, tt.want)
+	}
+}
+
+func (tt jsonValueComparator_EqualsTestCase[V]) name() string {
+	return tt.testName
+}
+
+func TestJSONValueComparator_Equals(t *testing.T) {
+	t.Parallel()
+	tests := []testCase{
+		jsonValueComparator_EqualsTestCase[int]{
+			testName: "Test int equality",
+			expected: 42,
+			got:      42,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[int]{
+			testName: "Test int equality - wrong value",
+			expected: 42,
+			got:      43,
+			want:     false,
+		},
+		jsonValueComparator_EqualsTestCase[int]{
+			testName: "Test int equality - string value",
+			expected: 42,
+			got:      "42",
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[int]{
+			testName: "Test int equality - []byte value",
+			expected: 42,
+			got:      []byte("42"),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[int]{
+			testName: "Test int equality - float value",
+			expected: 42,
+			got:      42.0,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[int8]{
+			testName: "Test int8 equality",
+			expected: 42,
+			got:      42,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[int8]{
+			testName: "Test int8 equality - wrong value",
+			expected: 42,
+			got:      43,
+			want:     false,
+		},
+		jsonValueComparator_EqualsTestCase[int8]{
+			testName: "Test int8 equality - int16 value",
+			expected: 42,
+			got:      int16(42),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[int8]{
+			testName: "Test int8 equality - uint16 value",
+			expected: 42,
+			got:      uint16(42),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float32]{
+			testName: "Test float32 equality - float value",
+			expected: 42.0,
+			got:      42.0,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float32]{
+			testName: "Test float32 equality - float value",
+			expected: 42.0,
+			got:      float64(42.0),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float64]{
+			testName: "Test float64 equality - float value",
+			expected: 42.0,
+			got:      42.0,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float64]{
+			testName: "Test float64 equality - int value",
+			expected: 42.0,
+			got:      42,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float64]{
+			testName: "Test float64 equality - []byte value",
+			expected: 42.0,
+			got:      []byte("42"),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float64]{
+			testName: "Test float64 equality - float32 value",
+			expected: 42.0,
+			got:      float32(42.0),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float64]{
+			testName: "Test float64 equality - string value",
+			expected: 42.0,
+			got:      "42.0",
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[float64]{
+			testName: "Test float64 equality - string value without dot",
+			expected: 42.0,
+			got:      "42",
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[string]{
+			testName: "Test string equality",
+			expected: "hello",
+			got:      "hello",
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[string]{
+			testName: "Test string equality - []byte value",
+			expected: "hello",
+			got:      []byte("hello"),
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[string]{
+			testName: "Test string equality - int value",
+			expected: "1337",
+			got:      1337,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[string]{
+			testName: "Test string equality - float value",
+			expected: "13.37",
+			got:      13.37,
+			want:     true,
+		},
+		jsonValueComparator_EqualsTestCase[string]{
+			testName: "Test string equality - wrong case",
+			expected: "hello",
+			got:      "HELLO",
+			want:     false,
+		},
+	}
+
+	//nolint:paralleltest
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name(), tt.run)
+	}
+}