wings/router/error.go

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package router
import (
"emperror.dev/errors"
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"fmt"
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"github.com/apex/log"
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"github.com/gin-gonic/gin"
"github.com/google/uuid"
"github.com/pterodactyl/wings/server"
"github.com/pterodactyl/wings/server/filesystem"
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"net/http"
"os"
"strings"
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)
type RequestError struct {
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err error
uuid string
message string
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server *server.Server
}
// Attaches an error to the gin.Context object for the request and ensures that it
// has a proper stacktrace associated with it when doing so.
//
// If you just call c.Error(err) without using this function you'll likely end up
// with an error that has no annotated stack on it.
func WithError(c *gin.Context, err error) error {
return c.Error(errors.WithStackDepthIf(err, 1))
}
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// Generates a new tracked error, which simply tracks the specific error that
// is being passed in, and also assigned a UUID to the error so that it can be
// cross referenced in the logs.
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func NewTrackedError(err error) *RequestError {
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return &RequestError{
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err: err,
uuid: uuid.Must(uuid.NewRandom()).String(),
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}
}
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// Same as NewTrackedError, except this will also attach the server instance that
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// generated this server for the purposes of logging.
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func NewServerError(err error, s *server.Server) *RequestError {
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return &RequestError{
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err: err,
uuid: uuid.Must(uuid.NewRandom()).String(),
server: s,
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}
}
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func (e *RequestError) logger() *log.Entry {
if e.server != nil {
return e.server.Log().WithField("error_id", e.uuid).WithField("error", e.err)
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}
return log.WithField("error_id", e.uuid).WithField("error", e.err)
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}
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// Sets the output message to display to the user in the error.
func (e *RequestError) SetMessage(msg string) *RequestError {
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e.message = msg
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return e
}
// Aborts the request with the given status code, and responds with the error. This
// will also include the error UUID in the output so that the user can report that
// and link the response to a specific error in the logs.
func (e *RequestError) AbortWithStatus(status int, c *gin.Context) {
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// In instances where the status has already been set just use that existing status
// since we cannot change it at this point, and trying to do so will emit a gin warning
// into the program output.
if c.Writer.Status() != 200 {
status = c.Writer.Status()
}
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// If this error is because the resource does not exist, we likely do not need to log
// the error anywhere, just return a 404 and move on with our lives.
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if errors.Is(e.err, os.ErrNotExist) {
e.logger().Debug("encountered os.IsNotExist error while handling request")
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c.AbortWithStatusJSON(http.StatusNotFound, gin.H{
"error": "The requested resource was not found on the system.",
})
return
}
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// If this is a Filesystem error just return it without all of the tracking code nonsense
// since we don't need to be logging it into the logs or anything, its just a normal error
// that the user can solve on their end.
if st, msg := e.getAsFilesystemError(); st != 0 {
c.AbortWithStatusJSON(st, gin.H{"error": msg})
return
}
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// Otherwise, log the error to zap, and then report the error back to the user.
if status >= 500 {
e.logger().Error("unexpected error while handling HTTP request")
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} else {
e.logger().Debug("non-server error encountered while handling HTTP request")
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}
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if e.message == "" {
e.message = "An unexpected error was encountered while processing this request."
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}
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c.AbortWithStatusJSON(status, gin.H{"error": e.message, "error_id": e.uuid})
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}
// Helper function to just abort with an internal server error. This is generally the response
// from most errors encountered by the API.
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func (e *RequestError) Abort(c *gin.Context) {
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e.AbortWithStatus(http.StatusInternalServerError, c)
}
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// Looks at the given RequestError and determines if it is a specific filesystem error that
// we can process and return differently for the user.
func (e *RequestError) getAsFilesystemError() (int, string) {
if errors.Is(e.err, os.ErrNotExist) || filesystem.IsErrorCode(e.err, filesystem.ErrCodePathResolution) {
return http.StatusNotFound, "The requested resource was not found on the system."
}
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if filesystem.IsErrorCode(e.err, filesystem.ErrCodeDiskSpace) {
return http.StatusConflict, "There is not enough disk space available to perform that action."
}
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if strings.HasSuffix(e.err.Error(), "file name too long") {
return http.StatusBadRequest, "Cannot perform that action: file name is too long."
}
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if e, ok := e.err.(*os.SyscallError); ok && e.Syscall == "readdirent" {
return http.StatusNotFound, "The requested directory does not exist."
}
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return 0, ""
}
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// Handle specific filesystem errors for a server.
func (e *RequestError) AbortFilesystemError(c *gin.Context) {
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e.Abort(c)
}
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// Format the error to a string and include the UUID.
func (e *RequestError) Error() string {
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return fmt.Sprintf("%v (uuid: %s)", e.err, e.uuid)
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}