github.com/dgraph-io/dgraph@v1.2.8/graphql/api/panics.go (about)

     1  /*
     2   * Copyright 2019 Dgraph Labs, Inc. and Contributors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package api
    18  
    19  import (
    20  	"runtime/debug"
    21  
    22  	"github.com/golang/glog"
    23  	"github.com/pkg/errors"
    24  )
    25  
    26  // PanicHandler catches panics to make sure that we recover from panics during
    27  // GraphQL request execution and return an appropriate error.
    28  //
    29  // If PanicHandler recovers from a panic, it logs a stack trace, creates an error
    30  // and applies fn to the error.
    31  func PanicHandler(requestID string, fn func(error)) {
    32  	if err := recover(); err != nil {
    33  		glog.Errorf("[%s] panic: %s.\n trace: %s", requestID, err, string(debug.Stack()))
    34  
    35  		fn(errors.Errorf("[%s] Internal Server Error - a panic was trapped.  "+
    36  			"This indicates a bug in the GraphQL server.  A stack trace was logged.  "+
    37  			"Please let us know : https://github.com/dgraph-io/dgraph/issues.",
    38  			requestID))
    39  	}
    40  }