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request.go
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request.go
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package rest
import (
"net/http"
"reflect"
"strconv"
"strings"
"github.com/grupawp/tensorflow-deploy/app"
"github.com/grupawp/tensorflow-deploy/exterr"
"github.com/go-chi/chi"
"gopkg.in/go-playground/validator.v9"
)
var (
logInvalidURLFieldErrorCode = 1003
errorInvalidURLField = exterr.NewErrorWithMessage("couldn't parse an url, invalid parameters").WithComponent(app.ComponentRest).WithCode(logInvalidURLFieldErrorCode)
)
// URLParams is dedicated struct to hold parameters given in URL
type URLParams struct {
Team string `validate:"required,max=32,min=1"`
Project string `validate:"required,max=32,min=1"`
Name string `validate:"omitempty,max=32,min=1"`
Version int64 `validate:"omitempty,gte=1,lte=999"`
Label string `validate:"omitempty,max=32,min=1"`
Status string `validate:"omitempty,max=32,min=1"`
SkipShortConfig bool `validate:"omitempty"`
}
// ServableID returns a ServableID struct based on
// current URLParams
func (p *URLParams) ServableID() app.ServableID {
return app.ServableID{Team: p.Team, Project: p.Project, Name: p.Name}
}
// QueryParameters returns a QueryParameters struct based on
// current URLParams
func (p *URLParams) QueryParameters() app.QueryParameters {
params := app.QueryParameters{}
s := reflect.ValueOf(p).Elem()
for i := 0; i < s.NumField(); i++ {
fieldName := s.Type().Field(i).Name
field := s.FieldByName(fieldName)
switch field.Kind() {
case reflect.String:
if len(field.String()) > 0 {
params[strings.ToLower(fieldName)] = field.String()
}
case reflect.Int64:
if field.Int() != 0 {
params[strings.ToLower(fieldName)] = field.Int()
}
}
}
return params
}
const (
urlTeam = "Team"
urlProject = "Project"
urlName = "Name"
urlVersion = "Version"
urlLabel = "Label"
urlSkipShortConfig = "SkipShortConfig"
)
func parseAndValidateParamsFromRequest(r *http.Request, allowQueryStrings bool, fields ...string) (*URLParams, error) {
var urlParams URLParams
var ommitedFields []string
if allowQueryStrings {
fields = nil
}
s := reflect.ValueOf(&urlParams).Elem()
for i := 0; i < s.NumField(); i++ {
ommitedFields = append(ommitedFields, s.Type().Field(i).Name)
if allowQueryStrings {
fields = append(fields, s.Type().Field(i).Name)
}
}
for _, field := range fields {
urlParam := getParamFromRequest(r, strings.ToLower(field))
if len(urlParam) == 0 && allowQueryStrings {
continue
}
for i, f := range ommitedFields {
if strings.Compare(f, field) == 0 {
ommitedFields = append(ommitedFields[:i], ommitedFields[i+1:]...)
}
}
if s.FieldByName(field) == (reflect.Value{}) {
return nil, errorInvalidURLField
}
switch s.FieldByName(field).Kind() {
case reflect.String:
s.FieldByName(field).SetString(strings.ToLower(urlParam))
case reflect.Int64:
parsed, _ := strconv.ParseInt(urlParam, 10, 64)
s.FieldByName(field).SetInt(parsed)
case reflect.Bool:
parsed, _ := strconv.ParseBool(urlParam)
s.FieldByName(field).SetBool(parsed)
}
}
if err := validator.New().StructExcept(urlParams, ommitedFields...); err != nil {
return nil, exterr.WrapWithFrame(err)
}
return &urlParams, nil
}
func getParamFromRequest(r *http.Request, name string) string {
param := chi.URLParam(r, name)
if len(param) > 0 {
return param
}
return r.URL.Query().Get(name)
}