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error.go
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error.go
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package middlewares
import (
"errors"
"fmt"
"github.com/Ozoniuss/casheer/currency"
"github.com/Ozoniuss/casheer/internal/apierrors"
ierrors "github.com/Ozoniuss/casheer/internal/errors"
"github.com/Ozoniuss/casheer/internal/handlers/common"
"github.com/Ozoniuss/casheer/internal/model"
"github.com/gin-gonic/gin"
"github.com/mattn/go-sqlite3"
"gorm.io/gorm"
)
// ErrorHandler is a middleware which gets called when errors occur inside the
// handlers.
func ErrorHandler() gin.HandlerFunc {
return func(ctx *gin.Context) {
// Execute the other handlers in the chain beforehand.
ctx.Next()
if len(ctx.Errors) == 0 {
return
}
err := ctx.Errors[0].Err
fmt.Printf("An error occured: %s\n", err.Error())
var invalidQueryParamsError ierrors.InvalidQueryParams
var invalidJsonBodyError ierrors.InvalidJsonBody
var missingContextParamError ierrors.MissingGinContextParam
var invalidContextParamTypeError ierrors.InvalidGinContextParamType
var invalidResourceError ierrors.InvalidModel
var sqlite3err sqlite3.Error
var invalidEntryKey model.ErrExpenseInvalidEntryKey
var invalidCurrencyError currency.ErrInvalidCurrency
var invalidModelError model.ErrInvalidModel
switch {
case errors.As(err, &invalidQueryParamsError):
common.EmitError(ctx, apierrors.NewQueryParamsBindingError(fmt.Sprintf("Invalid query parameters: %s", invalidQueryParamsError)))
case errors.As(err, &invalidJsonBodyError):
common.EmitError(ctx, apierrors.NewRequestBindingError(fmt.Sprintf("Invalid request body: %s", invalidJsonBodyError)))
case errors.As(err, &missingContextParamError):
common.EmitError(ctx, apierrors.NewUnknownError("something went wrong while handling the request."))
return
case errors.As(err, &invalidContextParamTypeError):
common.EmitError(ctx, apierrors.NewUnknownError("something went wrong while handling the request."))
return
case errors.As(err, &invalidResourceError):
common.EmitError(ctx, apierrors.NewInvalidResourceError(invalidResourceError.Error()))
return
// Should catch at least unique constraint error.
case errors.As(err, &sqlite3err):
if sqlite3err.Code == sqlite3.ErrConstraint && sqlite3err.ExtendedCode == sqlite3.ErrConstraintUnique {
common.EmitError(ctx, apierrors.NewAlreadyExistsError(sqlite3err.Error()))
} else {
common.EmitError(ctx, apierrors.NewUnknownError(err.Error()))
return
}
return
case errors.As(err, &invalidCurrencyError):
common.EmitError(ctx, apierrors.NewInvalidResourceError(invalidCurrencyError.Error()))
return
case errors.As(err, &invalidEntryKey):
common.EmitError(ctx, apierrors.NewInvalidResourceError(invalidEntryKey.Error()))
return
case errors.Is(err, gorm.ErrRecordNotFound):
common.EmitError(ctx, apierrors.NewNotFoundError())
return
case errors.As(err, &invalidModelError):
common.EmitError(ctx, apierrors.NewInvalidResourceError(err.Error()))
default:
common.EmitError(ctx, apierrors.NewUnknownError(err.Error()))
}
}
}