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refactor: rename semantics of datatype to validator.Type

This commit is contained in:
Adrien Marquès 2021-06-21 21:08:22 +02:00
parent 0ee814abbe
commit defa2c3645
Signed by: xdrm-brackets
GPG Key ID: D75243CA236D825E
23 changed files with 164 additions and 132 deletions
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10
README.md
View File

@ -89,16 +89,16 @@ import (
"github.com/xdrm-io/aicra"
"github.com/xdrm-io/aicra/api"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func main() {
builder := &aicra.Builder{}
// register data validators
builder.AddType(builtin.BoolDataType{})
builder.AddType(builtin.UintDataType{})
builder.AddType(builtin.StringDataType{})
// add custom type validators
builder.Validate(builtin.BoolDataType{})
builder.Validate(builtin.UintDataType{})
builder.Validate(builtin.StringDataType{})
// load your configuration
config, err := os.Open("api.json")

12
builder.go
View File

@ -5,9 +5,9 @@ import (
"io"
"net/http"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/internal/config"
"github.com/xdrm-io/aicra/internal/dynfunc"
"github.com/xdrm-io/aicra/validator"
)
// Builder for an aicra server
@ -31,18 +31,18 @@ type apiHandler struct {
dyn *dynfunc.Handler
}
// AddType adds an available datatype to the api definition
func (b *Builder) AddType(t datatype.T) error {
// Validate adds an available Type to validate in the api definition
func (b *Builder) Validate(t validator.Type) error {
if b.conf == nil {
b.conf = &config.Server{}
}
if b.conf.Services != nil {
return errLateType
}
if b.conf.Types == nil {
b.conf.Types = make([]datatype.T, 0)
if b.conf.Validators == nil {
b.conf.Validators = make([]validator.Type, 0)
}
b.conf.Types = append(b.conf.Types, t)
b.conf.Validators = append(b.conf.Validators, t)
return nil
}

18
builder_test.go
View File

@ -8,26 +8,26 @@ import (
"testing"
"github.com/xdrm-io/aicra/api"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func addBuiltinTypes(b *Builder) error {
if err := b.AddType(builtin.AnyDataType{}); err != nil {
if err := b.Validate(builtin.AnyDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.BoolDataType{}); err != nil {
if err := b.Validate(builtin.BoolDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.FloatDataType{}); err != nil {
if err := b.Validate(builtin.FloatDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.IntDataType{}); err != nil {
if err := b.Validate(builtin.IntDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.StringDataType{}); err != nil {
if err := b.Validate(builtin.StringDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.UintDataType{}); err != nil {
if err := b.Validate(builtin.UintDataType{}); err != nil {
return err
}
return nil
@ -35,7 +35,7 @@ func addBuiltinTypes(b *Builder) error {
func TestAddType(t *testing.T) {
builder := &Builder{}
err := builder.AddType(builtin.BoolDataType{})
err := builder.Validate(builtin.BoolDataType{})
if err != nil {
t.Fatalf("unexpected error: %s", err)
}
@ -43,7 +43,7 @@ func TestAddType(t *testing.T) {
if err != nil {
t.Fatalf("unexpected error: %s", err)
}
err = builder.AddType(builtin.FloatDataType{})
err = builder.Validate(builtin.FloatDataType{})
if err != errLateType {
t.Fatalf("expected <%v> got <%v>", errLateType, err)
}

23
datatype/datatype.go
View File

@ -1,23 +0,0 @@
package datatype
import (
"reflect"
)
// Validator returns whether a given value fulfills the datatype
// and casts the value into a common go type.
//
// for example, if a validator checks for upper case strings,
// whether the value is a []byte, a string or a []rune, if the
// value matches the validator's checks, it will be cast it into
// a common go type, say, string.
type Validator func(value interface{}) (cast interface{}, valid bool)
// T represents a datatype. The Build function returns a Validator if
// it manages types with the name `typeDefinition` (from the configuration field "type"); else it or returns NIL if the type
// definition does not match this datatype; the registry is passed to allow recursive datatypes (e.g. slices, structs, etc)
// The datatype's validator (when input is valid) must return a cast's go type matching the `Type() reflect.Type`
type T interface {
Type() reflect.Type
Build(typeDefinition string, registry ...T) Validator
}

14
handler_test.go
View File

@ -12,26 +12,26 @@ import (
"github.com/xdrm-io/aicra"
"github.com/xdrm-io/aicra/api"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func addBuiltinTypes(b *aicra.Builder) error {
if err := b.AddType(builtin.AnyDataType{}); err != nil {
if err := b.Validate(builtin.AnyDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.BoolDataType{}); err != nil {
if err := b.Validate(builtin.BoolDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.FloatDataType{}); err != nil {
if err := b.Validate(builtin.FloatDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.IntDataType{}); err != nil {
if err := b.Validate(builtin.IntDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.StringDataType{}); err != nil {
if err := b.Validate(builtin.StringDataType{}); err != nil {
return err
}
if err := b.AddType(builtin.UintDataType{}); err != nil {
if err := b.Validate(builtin.UintDataType{}); err != nil {
return err
}
return nil

8
internal/config/config.go
View File

@ -7,12 +7,12 @@ import (
"net/http"
"strings"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// Server definition
type Server struct {
Types []datatype.T
Validators []validator.Type
Services []*Service
}
@ -32,9 +32,9 @@ func (srv *Server) Parse(r io.Reader) error {
}
// validate implements the validator interface
func (server Server) validate(datatypes ...datatype.T) error {
func (server Server) validate(datatypes ...validator.Type) error {
for _, service := range server.Services {
err := service.validate(server.Types...)
err := service.validate(server.Validators...)
if err != nil {
return fmt.Errorf("%s '%s': %w", service.Method, service.Pattern, err)
}

26
internal/config/config_test.go
View File

@ -8,7 +8,7 @@ import (
"strings"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestLegalServiceName(t *testing.T) {
@ -239,7 +239,7 @@ func TestParamEmptyRenameNoRename(t *testing.T) {
}
]`)
srv := &Server{}
srv.Types = append(srv.Types, builtin.AnyDataType{})
srv.Validators = append(srv.Validators, builtin.AnyDataType{})
err := srv.Parse(r)
if err != nil {
t.Errorf("unexpected error: '%s'", err)
@ -275,8 +275,8 @@ func TestOptionalParam(t *testing.T) {
}
]`)
srv := &Server{}
srv.Types = append(srv.Types, builtin.AnyDataType{})
srv.Types = append(srv.Types, builtin.BoolDataType{})
srv.Validators = append(srv.Validators, builtin.AnyDataType{})
srv.Validators = append(srv.Validators, builtin.BoolDataType{})
err := srv.Parse(r)
if err != nil {
t.Errorf("unexpected error: '%s'", err)
@ -588,7 +588,7 @@ func TestParseParameters(t *testing.T) {
t.Run(fmt.Sprintf("method.%d", i), func(t *testing.T) {
srv := &Server{}
srv.Types = append(srv.Types, builtin.AnyDataType{})
srv.Validators = append(srv.Validators, builtin.AnyDataType{})
err := srv.Parse(strings.NewReader(test.Raw))
if err == nil && test.Error != nil {
@ -827,8 +827,8 @@ func TestServiceCollision(t *testing.T) {
t.Run(fmt.Sprintf("method.%d", i), func(t *testing.T) {
srv := &Server{}
srv.Types = append(srv.Types, builtin.StringDataType{})
srv.Types = append(srv.Types, builtin.UintDataType{})
srv.Validators = append(srv.Validators, builtin.StringDataType{})
srv.Validators = append(srv.Validators, builtin.UintDataType{})
err := srv.Parse(strings.NewReader(test.Config))
if err == nil && test.Error != nil {
@ -997,9 +997,9 @@ func TestMatchSimple(t *testing.T) {
t.Run(fmt.Sprintf("method.%d", i), func(t *testing.T) {
srv := &Server{}
srv.Types = append(srv.Types, builtin.AnyDataType{})
srv.Types = append(srv.Types, builtin.IntDataType{})
srv.Types = append(srv.Types, builtin.BoolDataType{})
srv.Validators = append(srv.Validators, builtin.AnyDataType{})
srv.Validators = append(srv.Validators, builtin.IntDataType{})
srv.Validators = append(srv.Validators, builtin.BoolDataType{})
err := srv.Parse(strings.NewReader(test.Config))
if err != nil {
@ -1081,9 +1081,9 @@ func TestFindPriority(t *testing.T) {
t.Run(fmt.Sprintf("method.%d", i), func(t *testing.T) {
srv := &Server{}
srv.Types = append(srv.Types, builtin.AnyDataType{})
srv.Types = append(srv.Types, builtin.IntDataType{})
srv.Types = append(srv.Types, builtin.BoolDataType{})
srv.Validators = append(srv.Validators, builtin.AnyDataType{})
srv.Validators = append(srv.Validators, builtin.IntDataType{})
srv.Validators = append(srv.Validators, builtin.BoolDataType{})
err := srv.Parse(strings.NewReader(test.Config))
if err != nil {

14
internal/config/parameter.go
View File

@ -3,7 +3,7 @@ package config
import (
"reflect"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// Parameter represents a parameter definition (from api.json)
@ -12,13 +12,13 @@ type Parameter struct {
Type string `json:"type"`
Rename string `json:"name,omitempty"`
Optional bool
// ExtractType is the type the Validator will cast into
ExtractType reflect.Type
// GoType is the type the Validator will cast into
GoType reflect.Type
// Validator is inferred from the "type" property
Validator datatype.Validator
Validator validator.ValidateFunc
}
func (param *Parameter) validate(datatypes ...datatype.T) error {
func (param *Parameter) validate(datatypes ...validator.Type) error {
if len(param.Description) < 1 {
return errMissingParamDesc
}
@ -35,8 +35,8 @@ func (param *Parameter) validate(datatypes ...datatype.T) error {
// find validator
for _, dtype := range datatypes {
param.Validator = dtype.Build(param.Type, datatypes...)
param.ExtractType = dtype.Type()
param.Validator = dtype.Validator(param.Type, datatypes...)
param.GoType = dtype.GoType()
if param.Validator != nil {
break
}

8
internal/config/service.go
View File

@ -6,7 +6,7 @@ import (
"regexp"
"strings"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
var braceRegex = regexp.MustCompile(`^{([a-z_-]+)}$`)
@ -97,7 +97,7 @@ func (svc *Service) matchPattern(uri string) bool {
}
// Validate implements the validator interface
func (svc *Service) validate(datatypes ...datatype.T) error {
func (svc *Service) validate(datatypes ...validator.Type) error {
// check method
err := svc.isMethodAvailable()
if err != nil {
@ -195,7 +195,7 @@ func (svc *Service) isPatternValid() error {
return nil
}
func (svc *Service) validateInput(types []datatype.T) error {
func (svc *Service) validateInput(types []validator.Type) error {
// ignore no parameter
if svc.Input == nil || len(svc.Input) < 1 {
@ -285,7 +285,7 @@ func (svc *Service) validateInput(types []datatype.T) error {
return nil
}
func (svc *Service) validateOutput(types []datatype.T) error {
func (svc *Service) validateOutput(types []validator.Type) error {
// ignore no parameter
if svc.Output == nil || len(svc.Output) < 1 {

6
internal/dynfunc/signature.go
View File

@ -31,17 +31,17 @@ func BuildSignature(service config.Service) *Signature {
}
// make a pointer if optional
if param.Optional {
s.Input[param.Rename] = reflect.PtrTo(param.ExtractType)
s.Input[param.Rename] = reflect.PtrTo(param.GoType)
continue
}
s.Input[param.Rename] = param.ExtractType
s.Input[param.Rename] = param.GoType
}
for _, param := range service.Output {
if len(param.Rename) < 1 {
continue
}
s.Output[param.Rename] = param.ExtractType
s.Output[param.Rename] = param.GoType
}
return s

10
datatype/builtin/any.go → validator/builtin/any.go
View File

@ -3,19 +3,19 @@ package builtin
import (
"reflect"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// AnyDataType is what its name tells
type AnyDataType struct{}
// Type returns the type of data
func (AnyDataType) Type() reflect.Type {
// GoType returns the type of data
func (AnyDataType) GoType() reflect.Type {
return reflect.TypeOf(interface{}(nil))
}
// Build returns the validator
func (AnyDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
// Validator returns the validator
func (AnyDataType) Validator(typeName string, registry ...validator.Type) validator.ValidateFunc {
// nothing if type not handled
if typeName != "any" {
return nil

6
datatype/builtin/any_test.go → validator/builtin/any_test.go
View File

@ -4,7 +4,7 @@ import (
"fmt"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestAny_AvailableTypes(t *testing.T) {
@ -26,7 +26,7 @@ func TestAny_AvailableTypes(t *testing.T) {
}
for _, test := range tests {
validator := dt.Build(test.Type)
validator := dt.Validator(test.Type)
if validator == nil {
if test.Handled {
@ -47,7 +47,7 @@ func TestAny_AlwaysTrue(t *testing.T) {
const typeName = "any"
validator := builtin.AnyDataType{}.Build(typeName)
validator := builtin.AnyDataType{}.Validator(typeName)
if validator == nil {
t.Errorf("expect %q to be handled", typeName)
t.Fail()

10
datatype/builtin/bool.go → validator/builtin/bool.go
View File

@ -3,19 +3,19 @@ package builtin
import (
"reflect"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// BoolDataType is what its name tells
type BoolDataType struct{}
// Type returns the type of data
func (BoolDataType) Type() reflect.Type {
// GoType returns the type of data
func (BoolDataType) GoType() reflect.Type {
return reflect.TypeOf(true)
}
// Build returns the validator
func (BoolDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
// Validator returns the validator
func (BoolDataType) Validator(typeName string, registry ...validator.Type) validator.ValidateFunc {
// nothing if type not handled
if typeName != "bool" {
return nil

6
datatype/builtin/bool_test.go → validator/builtin/bool_test.go
View File

@ -4,7 +4,7 @@ import (
"fmt"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestBool_AvailableTypes(t *testing.T) {
@ -26,7 +26,7 @@ func TestBool_AvailableTypes(t *testing.T) {
for _, test := range tests {
t.Run(test.Type, func(t *testing.T) {
validator := dt.Build(test.Type)
validator := dt.Validator(test.Type)
if validator == nil {
if test.Handled {
t.Errorf("expect %q to be handled", test.Type)
@ -49,7 +49,7 @@ func TestBool_Values(t *testing.T) {
const typeName = "bool"
validator := builtin.BoolDataType{}.Build(typeName)
validator := builtin.BoolDataType{}.Validator(typeName)
if validator == nil {
t.Errorf("expect %q to be handled", typeName)
t.Fail()

10
datatype/builtin/float.go → validator/builtin/float.go
View File

@ -4,19 +4,19 @@ import (
"encoding/json"
"reflect"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// FloatDataType is what its name tells
type FloatDataType struct{}
// Type returns the type of data
func (FloatDataType) Type() reflect.Type {
// GoType returns the type of data
func (FloatDataType) GoType() reflect.Type {
return reflect.TypeOf(float64(0))
}
// Build returns the validator
func (FloatDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
// Validator returns the validator
func (FloatDataType) Validator(typeName string, registry ...validator.Type) validator.ValidateFunc {
// nothing if type not handled
if typeName != "float64" && typeName != "float" {
return nil

6
datatype/builtin/float_test.go → validator/builtin/float_test.go
View File

@ -5,7 +5,7 @@ import (
"math"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestFloat64_AvailableTypes(t *testing.T) {
@ -33,7 +33,7 @@ func TestFloat64_AvailableTypes(t *testing.T) {
for _, test := range tests {
t.Run(test.Type, func(t *testing.T) {
validator := dt.Build(test.Type)
validator := dt.Validator(test.Type)
if validator == nil {
if test.Handled {
t.Errorf("expect %q to be handled", test.Type)
@ -56,7 +56,7 @@ func TestFloat64_Values(t *testing.T) {
const typeName = "float"
validator := builtin.FloatDataType{}.Build(typeName)
validator := builtin.FloatDataType{}.Validator(typeName)
if validator == nil {
t.Errorf("expect %q to be handled", typeName)
t.Fail()

10
datatype/builtin/int.go → validator/builtin/int.go
View File

@ -5,19 +5,19 @@ import (
"math"
"reflect"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// IntDataType is what its name tells
type IntDataType struct{}
// Type returns the type of data
func (IntDataType) Type() reflect.Type {
// GoType returns the type of data
func (IntDataType) GoType() reflect.Type {
return reflect.TypeOf(int(0))
}
// Build returns the validator
func (IntDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
// Validator returns the validator
func (IntDataType) Validator(typeName string, registry ...validator.Type) validator.ValidateFunc {
// nothing if type not handled
if typeName != "int" {
return nil

6
datatype/builtin/int_test.go → validator/builtin/int_test.go
View File

@ -5,7 +5,7 @@ import (
"math"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestInt_AvailableTypes(t *testing.T) {
@ -27,7 +27,7 @@ func TestInt_AvailableTypes(t *testing.T) {
for _, test := range tests {
t.Run(test.Type, func(t *testing.T) {
validator := dt.Build(test.Type)
validator := dt.Validator(test.Type)
if validator == nil {
if test.Handled {
t.Errorf("expect %q to be handled", test.Type)
@ -50,7 +50,7 @@ func TestInt_Values(t *testing.T) {
const typeName = "int"
validator := builtin.IntDataType{}.Build(typeName)
validator := builtin.IntDataType{}.Validator(typeName)
if validator == nil {
t.Errorf("expect %q to be handled", typeName)
t.Fail()

10
datatype/builtin/string.go → validator/builtin/string.go
View File

@ -5,7 +5,7 @@ import (
"regexp"
"strconv"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
var fixedLengthRegex = regexp.MustCompile(`^string\((\d+)\)$`)
@ -14,14 +14,14 @@ var variableLengthRegex = regexp.MustCompile(`^string\((\d+), ?(\d+)\)$`)
// StringDataType is what its name tells
type StringDataType struct{}
// Type returns the type of data
func (StringDataType) Type() reflect.Type {
// GoType returns the type of data
func (StringDataType) GoType() reflect.Type {
return reflect.TypeOf(string(""))
}
// Build returns the validator.
// Validator returns the validator.
// availables type names are : `string`, `string(length)` and `string(minLength, maxLength)`.
func (s StringDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
func (s StringDataType) Validator(typeName string, registry ...validator.Type) validator.ValidateFunc {
simple := typeName == "string"
fixedLengthMatches := fixedLengthRegex.FindStringSubmatch(typeName)
variableLengthMatches := variableLengthRegex.FindStringSubmatch(typeName)

10
datatype/builtin/string_test.go → validator/builtin/string_test.go
View File

@ -4,7 +4,7 @@ import (
"fmt"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestString_AvailableTypes(t *testing.T) {
@ -53,7 +53,7 @@ func TestString_AvailableTypes(t *testing.T) {
for _, test := range tests {
t.Run(test.Type, func(t *testing.T) {
validator := dt.Build(test.Type)
validator := dt.Validator(test.Type)
if validator == nil {
if test.Handled {
@ -75,7 +75,7 @@ func TestString_AnyLength(t *testing.T) {
const typeName = "string"
validator := builtin.StringDataType{}.Build(typeName)
validator := builtin.StringDataType{}.Validator(typeName)
if validator == nil {
t.Errorf("expect %q to be handled", typeName)
t.Fail()
@ -133,7 +133,7 @@ func TestString_FixedLength(t *testing.T) {
for i, test := range tests {
t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
validator := builtin.StringDataType{}.Build(test.Type)
validator := builtin.StringDataType{}.Validator(test.Type)
if validator == nil {
t.Errorf("expect %q to be handled", test.Type)
t.Fail()
@ -194,7 +194,7 @@ func TestString_VariableLength(t *testing.T) {
for i, test := range tests {
t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
validator := builtin.StringDataType{}.Build(test.Type)
validator := builtin.StringDataType{}.Validator(test.Type)
if validator == nil {
t.Errorf("expect %q to be handled", test.Type)
t.Fail()

10
datatype/builtin/uint.go → validator/builtin/uint.go
View File

@ -5,19 +5,19 @@ import (
"math"
"reflect"
"github.com/xdrm-io/aicra/datatype"
"github.com/xdrm-io/aicra/validator"
)
// UintDataType is what its name tells
type UintDataType struct{}
// Type returns the type of data
func (UintDataType) Type() reflect.Type {
// GoType returns the type of data
func (UintDataType) GoType() reflect.Type {
return reflect.TypeOf(uint(0))
}
// Build returns the validator
func (UintDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
// Validator returns the validator
func (UintDataType) Validator(typeName string, registry ...validator.Type) validator.ValidateFunc {
// nothing if type not handled
if typeName != "uint" {
return nil

6
datatype/builtin/uint_test.go → validator/builtin/uint_test.go
View File

@ -5,7 +5,7 @@ import (
"math"
"testing"
"github.com/xdrm-io/aicra/datatype/builtin"
"github.com/xdrm-io/aicra/validator/builtin"
)
func TestUint_AvailableTypes(t *testing.T) {
@ -27,7 +27,7 @@ func TestUint_AvailableTypes(t *testing.T) {
for _, test := range tests {
t.Run(test.Type, func(t *testing.T) {
validator := dt.Build(test.Type)
validator := dt.Validator(test.Type)
if validator == nil {
if test.Handled {
t.Errorf("expect %q to be handled", test.Type)
@ -50,7 +50,7 @@ func TestUint_Values(t *testing.T) {
const typeName = "uint"
validator := builtin.UintDataType{}.Build(typeName)
validator := builtin.UintDataType{}.Validator(typeName)
if validator == nil {
t.Errorf("expect %q to be handled", typeName)
t.Fail()

55
validator/validator.go Normal file
View File

@ -0,0 +1,55 @@
package validator
import (
"reflect"
)
// ValidateFunc returns whether a given value fulfills the datatype and casts
// the value into a go type.
//
// for example, if a validator checks for upper case strings, whether the value
// is a []byte, a string or a []rune, if the value matches is all upper-case, it
// will be cast into a go type, say, string.
type ValidateFunc func(value interface{}) (cast interface{}, valid bool)
// Type defines an available in/out parameter "type" for the aicra configuration
//
// A Type maps to a go type in order to generate the handler signature from the
// aicra configuration
//
// A Type returns a custom validator when the typename matches
type Type interface {
// Validator function when the typename matches. It must return nil when the
// typename does not match
//
// The `typename` argument has to match types used in your aicra configuration
// in parameter definitions ("in", "out") and in the "type" json field.
//
// basic example:
// - `IntType.Validator("string")`` should return nil
// - `IntType.Validator("int")`` should return its ValidateFunc
//
// The `typename` is not returned by a simple method i.e. `TypeName() string`
// because it allows for validation relative to the typename, for instance:
// - `VarcharType.Validator("varchar")` valides any string
// - `VarcharType.Validator("varchar(2)")` validates any string of 2
// characters
// - `VarcharType.Validator("varchar(1,3)")` validates any string
// with a length between 1 and 3
//
// The `registry` argument represents all other available Types. It allows a
// Type to use other available Types internally.
//
// recursive example: slices
// - `SliceType.Validator("[]int", reg...)` validates a slice containing
// values that are valide to the `IntType`
// - `SliceType.Validator("[]varchar", reg...)` validates a slice containing
// values that are valid to the `VarcharType`
//
// and so on.. this works for maps, structs, etc
Validator(typename string, registry ...Type) ValidateFunc
// GoType must return the go type associated with the output type of ValidateFunc.
// It is used to define handlers' signature from the configuration file.
GoType() reflect.Type
}