Merge branch 'refactor/config-validator' of go/aicra into 0.3.0

add validator interface to unify and for readability in internal/config

datatype/builtin/any.go

@@ -6,7 +6,7 @@ import "git.xdrm.io/go/aicra/datatype"
 type AnyDataType struct{}
 
 // Build returns the validator
-func (AnyDataType) Build(typeName string) datatype.Validator {
+func (AnyDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
 	// nothing if type not handled
 	if typeName != "any" {
 		return nil

datatype/builtin/bool.go

@@ -6,7 +6,7 @@ import "git.xdrm.io/go/aicra/datatype"
 type BoolDataType struct{}
 
 // Build returns the validator
-func (BoolDataType) Build(typeName string) datatype.Validator {
+func (BoolDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
 	// nothing if type not handled
 	if typeName != "bool" {
 		return nil

datatype/builtin/float.go

@@ -10,7 +10,7 @@ import (
 type FloatDataType struct{}
 
 // Build returns the validator
-func (FloatDataType) Build(typeName string) datatype.Validator {
+func (FloatDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
 	// nothing if type not handled
 	if typeName != "float64" && typeName != "float" {
 		return nil

datatype/builtin/int.go

@@ -11,7 +11,7 @@ import (
 type IntDataType struct{}
 
 // Build returns the validator
-func (IntDataType) Build(typeName string) datatype.Validator {
+func (IntDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
 	// nothing if type not handled
 	if typeName != "int" {
 		return nil

datatype/builtin/string.go

@@ -15,7 +15,7 @@ type StringDataType struct{}
 
 // Build returns the validator.
 // availables type names are : `string`, `string(length)` and `string(minLength, maxLength)`.
-func (s StringDataType) Build(typeName string) datatype.Validator {
+func (s StringDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
 	simple := typeName == "string"
 	fixedLengthMatches := fixedLengthRegex.FindStringSubmatch(typeName)
 	variableLengthMatches := variableLengthRegex.FindStringSubmatch(typeName)

datatype/builtin/uint.go

@@ -11,7 +11,7 @@ import (
 type UintDataType struct{}
 
 // Build returns the validator
-func (UintDataType) Build(typeName string) datatype.Validator {
+func (UintDataType) Build(typeName string, registry ...datatype.T) datatype.Validator {
 	// nothing if type not handled
 	if typeName != "uint" {
 		return nil

datatype/types.go

@@ -4,9 +4,9 @@ package datatype
 // and casts the value into a compatible type
 type Validator func(value interface{}) (cast interface{}, valid bool)
 
-// T builds a T from the type definition (from the
+// T builds a T from the type definition (from the configuration field "type") and returns NIL if the type
-// configuration field "type") and returns NIL if the type
+// definition does not match this T ; the registry is passed for recursive datatypes (e.g. slices, structs, etc)
-// definition does not match this T
+// to be able to access other datatypes
 type T interface {
-	Build(typeDefinition string) Validator
+	Build(typeDefinition string, registry ...T) Validator
 }

internal/config/parameter.go

@@ -2,8 +2,8 @@ package config
 
 import "git.xdrm.io/go/aicra/datatype"
 
-func (param *Parameter) checkAndFormat() error {
+// Validate implements the validator interface
-
+func (param *Parameter) Validate(datatypes ...datatype.T) error {
 	// missing description
 	if len(param.Description) < 1 {
 		return ErrMissingParamDesc
@@ -14,7 +14,7 @@ func (param *Parameter) checkAndFormat() error {
 		return ErrMissingParamType
 	}
 
-	// set optional + type
+	// optional type transform
 	if param.Type[0] == '?' {
 		param.Optional = true
 		param.Type = param.Type[1:]
@@ -22,14 +22,3 @@ func (param *Parameter) checkAndFormat() error {
 
 	return nil
 }
-
-// assigns the first matching data type from the type definition
-func (param *Parameter) assignDataType(types []datatype.T) bool {
-	for _, dtype := range types {
-		param.Validator = dtype.Build(param.Type)
-		if param.Validator != nil {
-			return true
-		}
-	}
-	return false
-}

internal/config/server.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"strings"
 
 	"git.xdrm.io/go/aicra/datatype"
 )
@@ -17,29 +16,40 @@ func Parse(r io.Reader, dtypes ...datatype.T) (*Server, error) {
 		Types:    make([]datatype.T, 0),
 		Services: make([]*Service, 0),
 	}
+
 	// add data types
 	for _, dtype := range dtypes {
 		server.Types = append(server.Types, dtype)
 	}
 
-	// parse JSON
 	if err := json.NewDecoder(r).Decode(&server.Services); err != nil {
 		return nil, fmt.Errorf("%s: %w", ErrRead, err)
 	}
 
-	// check services
+	if err := server.Validate(); err != nil {
-	if err := server.checkAndFormat(); err != nil {
-		return nil, fmt.Errorf("%s: %w", ErrFormat, err)
-	}
-
-	// check collisions
-	if err := server.collide(); err != nil {
 		return nil, fmt.Errorf("%s: %w", ErrFormat, err)
 	}
 
 	return server, nil
 }
 
+// Validate implements the validator interface
+func (server Server) Validate(datatypes ...datatype.T) error {
+	for _, service := range server.Services {
+		err := service.Validate(server.Types...)
+		if err != nil {
+			return fmt.Errorf("%s '%s': %w", service.Method, service.Pattern, err)
+		}
+	}
+
+	// check for collisions
+	if err := server.collide(); err != nil {
+		return fmt.Errorf("%s: %w", ErrFormat, err)
+	}
+
+	return nil
+}
+
 // Find a service matching an incoming HTTP request
 func (server Server) Find(r *http.Request) *Service {
 	for _, service := range server.Services {
@@ -157,42 +167,3 @@ func (server *Server) collide() error {
 
 	return nil
 }
-
-// checkAndFormat checks for errors and missing fields and sets default values for optional fields.
-func (server Server) checkAndFormat() error {
-	for _, service := range server.Services {
-
-		// check method
-		err := service.checkMethod()
-		if err != nil {
-			return fmt.Errorf("%s '%s' [method]: %w", service.Method, service.Pattern, err)
-		}
-
-		// check pattern
-		service.Pattern = strings.Trim(service.Pattern, " \t\r\n")
-		err = service.checkPattern()
-		if err != nil {
-			return fmt.Errorf("%s '%s' [path]: %w", service.Method, service.Pattern, err)
-		}
-
-		// check description
-		if len(strings.Trim(service.Description, " \t\r\n")) < 1 {
-			return fmt.Errorf("%s '%s' [description]: %w", service.Method, service.Pattern, ErrMissingDescription)
-		}
-
-		// check input parameters
-		err = service.checkAndFormatInput(server.Types)
-		if err != nil {
-			return fmt.Errorf("%s '%s' [in]: %w", service.Method, service.Pattern, err)
-		}
-
-		// fail if a brace capture remains undefined
-		for _, capture := range service.Captures {
-			if capture.Ref == nil {
-				return fmt.Errorf("%s '%s' [in]: %s: %w", service.Method, service.Pattern, capture.Name, ErrUndefinedBraceCapture)
-			}
-		}
-
-	}
-	return nil
-}

internal/config/service.go

@@ -30,7 +30,88 @@ func (svc *Service) Match(req *http.Request) bool {
 	return true
 }
 
-func (svc *Service) checkMethod() error {
+// checks if an uri matches the service's pattern
+func (svc *Service) matchPattern(uri string) bool {
+	uriparts := SplitURL(uri)
+	parts := SplitURL(svc.Pattern)
+
+	// fail if size differ
+	if len(uriparts) != len(parts) {
+		return false
+	}
+
+	// root url '/'
+	if len(parts) == 0 {
+		return true
+	}
+
+	// check part by part
+	for i, part := range parts {
+		uripart := uriparts[i]
+
+		isCapture := len(part) > 0 && part[0] == '{'
+
+		// if no capture -> check equality
+		if !isCapture {
+			if part != uripart {
+				return false
+			}
+			continue
+		}
+
+		param, exists := svc.Input[part]
+
+		// fail if no validator
+		if !exists || param.Validator == nil {
+			return false
+		}
+
+		// fail if not type-valid
+		if _, valid := param.Validator(uripart); !valid {
+			return false
+		}
+	}
+
+	return true
+}
+
+// Validate implements the validator interface
+func (svc *Service) Validate(datatypes ...datatype.T) error {
+	// check method
+	err := svc.isMethodAvailable()
+	if err != nil {
+		return fmt.Errorf("field 'method': %w", err)
+	}
+
+	// check pattern
+	svc.Pattern = strings.Trim(svc.Pattern, " \t\r\n")
+	err = svc.isPatternValid()
+	if err != nil {
+		return fmt.Errorf("field 'path': %w", err)
+	}
+
+	// check description
+	if len(strings.Trim(svc.Description, " \t\r\n")) < 1 {
+		return fmt.Errorf("field 'description': %w", ErrMissingDescription)
+	}
+
+	// check input parameters
+	err = svc.validateInput(datatypes)
+	if err != nil {
+		return fmt.Errorf("field 'in': %w", err)
+	}
+
+	// fail if a brace capture remains undefined
+	for _, capture := range svc.Captures {
+		if capture.Ref == nil {
+			return fmt.Errorf("field 'in': %s: %w", capture.Name, ErrUndefinedBraceCapture)
+		}
+	}
+
+	return nil
+}
+
+func (svc *Service) isMethodAvailable() error {
 	for _, available := range availableHTTPMethods {
 		if svc.Method == available {
 			return nil
@@ -39,7 +120,7 @@ func (svc *Service) checkMethod() error {
 	return ErrUnknownMethod
 }
 
-func (svc *Service) checkPattern() error {
+func (svc *Service) isPatternValid() error {
 	length := len(svc.Pattern)
 
 	// empty pattern
@@ -87,7 +168,7 @@ func (svc *Service) checkPattern() error {
 	return nil
 }
 
-func (svc *Service) checkAndFormatInput(types []datatype.T) error {
+func (svc *Service) validateInput(types []datatype.T) error {
 
 	// ignore no parameter
 	if svc.Input == nil || len(svc.Input) < 1 {
@@ -141,7 +222,7 @@ func (svc *Service) checkAndFormatInput(types []datatype.T) error {
 			param.Rename = paramName
 		}
 
-		err := param.checkAndFormat()
+		err := param.Validate()
 		if err != nil {
 			return fmt.Errorf("%s: %w", paramName, err)
 		}
@@ -151,7 +232,16 @@ func (svc *Service) checkAndFormatInput(types []datatype.T) error {
 			return fmt.Errorf("%s: %w", paramName, ErrIllegalOptionalURIParam)
 		}
 
-		if !param.assignDataType(types) {
+		// assign the datatype
+		datatypeFound := false
+		for _, dtype := range types {
+			param.Validator = dtype.Build(param.Type, types...)
+			if param.Validator != nil {
+				datatypeFound = true
+				break
+			}
+		}
+		if !datatypeFound {
 			return fmt.Errorf("%s: %w", paramName, ErrUnknownDataType)
 		}
 
@@ -175,48 +265,3 @@ func (svc *Service) checkAndFormatInput(types []datatype.T) error {
 
 	return nil
 }
-
-// checks if an uri matches the service's pattern
-func (svc *Service) matchPattern(uri string) bool {
-	uriparts := SplitURL(uri)
-	parts := SplitURL(svc.Pattern)
-
-	// fail if size differ
-	if len(uriparts) != len(parts) {
-		return false
-	}
-
-	// root url '/'
-	if len(parts) == 0 {
-		return true
-	}
-
-	// check part by part
-	for i, part := range parts {
-		uripart := uriparts[i]
-
-		isCapture := len(part) > 0 && part[0] == '{'
-
-		// if no capture -> check equality
-		if !isCapture {
-			if part != uripart {
-				return false
-			}
-			continue
-		}
-
-		param, exists := svc.Input[part]
-
-		// fail if no validator
-		if !exists || param.Validator == nil {
-			return false
-		}
-
-		// fail if not type-valid
-		if _, valid := param.Validator(uripart); !valid {
-			return false
-		}
-	}
-
-	return true
-}

internal/config/types.go

@@ -8,6 +8,11 @@ import (
 
 var availableHTTPMethods = []string{http.MethodGet, http.MethodPost, http.MethodPut, http.MethodDelete}
 
+// validator unifies the check and format routine
+type validator interface {
+	Validate(...datatype.T) error
+}
+
 // Server represents a full server configuration
 type Server struct {
 	Types    []datatype.T

server.go

@@ -64,7 +64,7 @@ func (s Server) ToHTTPServer() (*httpServer, error) {
 	for _, service := range s.config.Services {
 		found := false
 		for _, handler := range s.handlers {
-			if handler.GetPath() == service.Pattern {
+			if handler.GetMethod() == service.Method && handler.GetPath() == service.Pattern {
 				found = true
 				break
 			}