// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

syntax = "proto3";

package google.rpc;

import "google/protobuf/duration.proto";

option go_package = "google.golang.org/genproto/googleapis/rpc/errdetails;errdetails";
option java_multiple_files = true;
option java_outer_classname = "ErrorDetailsProto";
option java_package = "com.google.rpc";
option objc_class_prefix = "RPC";

// Describes when the clients can retry a failed request. Clients could ignore
// the recommendation here or retry when this information is missing from error
// responses.
//
// It's always recommended that clients should use exponential backoff when
// retrying.
//
// Clients should wait until `retry_delay` amount of time has passed since
// receiving the error response before retrying.  If retrying requests also
// fail, clients should use an exponential backoff scheme to gradually increase
// the delay between retries based on `retry_delay`, until either a maximum
// number of retries have been reached or a maximum retry delay cap has been
// reached.
message RetryInfo {
  // Clients should wait at least this long between retrying the same request.
  google.protobuf.Duration retry_delay = 1;
}

// Describes additional debugging info.
message DebugInfo {
  // The stack trace entries indicating where the error occurred.
  repeated string stack_entries = 1;

  // Additional debugging information provided by the server.
  string detail = 2;
}

// Describes how a quota check failed.
//
// For example if a daily limit was exceeded for the calling project,
// a service could respond with a QuotaFailure detail containing the project
// id and the description of the quota limit that was exceeded.  If the
// calling project hasn't enabled the service in the developer console, then
// a service could respond with the project id and set `service_disabled`
// to true.
//
// Also see RetryInfo and Help types for other details about handling a
// quota failure.
message QuotaFailure {
  // A message type used to describe a single quota violation.  For example, a
  // daily quota or a custom quota that was exceeded.
  message Violation {
    // The subject on which the quota check failed.
    // For example, "clientip:<ip address of client>" or "project:<Google
    // developer project id>".
    string subject = 1;

    // A description of how the quota check failed. Clients can use this
    // description to find more about the quota configuration in the service's
    // public documentation, or find the relevant quota limit to adjust through
    // developer console.
    //
    // For example: "Service disabled" or "Daily Limit for read operations
    // exceeded".
    string description = 2;
  }

  // Describes all quota violations.
  repeated Violation violations = 1;
}

// Describes the cause of the error with structured details.
//
// Example of an error when contacting the "pubsub.googleapis.com" API when it
// is not enabled:
//     { "reason": "API_DISABLED"
//       "domain": "googleapis.com"
//       "metadata": {
//         "resource": "projects/123",
//         "service": "pubsub.googleapis.com"
//       }
//     }
// This response indicates that the pubsub.googleapis.com API is not enabled.
//
// Example of an error that is returned when attempting to create a Spanner
// instance in a region that is out of stock:
//     { "reason": "STOCKOUT"
//       "domain": "spanner.googleapis.com",
//       "metadata": {
//         "availableRegions": "us-central1,us-east2"
//       }
//     }
//
message ErrorInfo {
  // The reason of the error. This is a constant value that identifies the
  // proximate cause of the error. Error reasons are unique within a particular
  // domain of errors. This should be at most 63 characters and match
  // /[A-Z0-9_]+/.
  string reason = 1;

  // The logical grouping to which the "reason" belongs.  Often "domain" will
  // contain the registered service name of the tool or product that is the
  // source of the error. Example: "pubsub.googleapis.com". If the error is
  // common across many APIs, the first segment of the example above will be
  // omitted.  The value will be, "googleapis.com".
  string domain = 2;

  // Additional structured details about this error.
  //
  // Keys should match /[a-zA-Z0-9-_]/ and be limited to 64 characters in
  // length. When identifying the current value of an exceeded limit, the units
  // should be contained in the key, not the value.  For example, rather than
  // {"instanceLimit": "100/request"}, should be returned as,
  // {"instanceLimitPerRequest": "100"}, if the client exceeds the number of
  // instances that can be created in a single (batch) request.
  map<string, string> metadata = 3;
}

// Describes what preconditions have failed.
//
// For example, if an RPC failed because it required the Terms of Service to be
// acknowledged, it could list the terms of service violation in the
// PreconditionFailure message.
message PreconditionFailure {
  // A message type used to describe a single precondition failure.
  message Violation {
    // The type of PreconditionFailure. We recommend using a service-specific
    // enum type to define the supported precondition violation subjects. For
    // example, "TOS" for "Terms of Service violation".
    string type = 1;

    // The subject, relative to the type, that failed.
    // For example, "google.com/cloud" relative to the "TOS" type would indicate
    // which terms of service is being referenced.
    string subject = 2;

    // A description of how the precondition failed. Developers can use this
    // description to understand how to fix the failure.
    //
    // For example: "Terms of service not accepted".
    string description = 3;
  }

  // Describes all precondition violations.
  repeated Violation violations = 1;
}

// Describes violations in a client request. This error type focuses on the
// syntactic aspects of the request.
message BadRequest {
  // A message type used to describe a single bad request field.
  message FieldViolation {
    // A path leading to a field in the request body. The value will be a
    // sequence of dot-separated identifiers that identify a protocol buffer
    // field. E.g., "field_violations.field" would identify this field.
    string field = 1;

    // A description of why the request element is bad.
    string description = 2;
  }

  // Describes all violations in a client request.
  repeated FieldViolation field_violations = 1;
}

// Contains metadata about the request that clients can attach when filing a bug
// or providing other forms of feedback.
message RequestInfo {
  // An opaque string that should only be interpreted by the service generating
  // it. For example, it can be used to identify requests in the service's logs.
  string request_id = 1;

  // Any data that was used to serve this request. For example, an encrypted
  // stack trace that can be sent back to the service provider for debugging.
  string serving_data = 2;
}

// Describes the resource that is being accessed.
message ResourceInfo {
  // A name for the type of resource being accessed, e.g. "sql table",
  // "cloud storage bucket", "file", "Google calendar"; or the type URL
  // of the resource: e.g. "type.googleapis.com/google.pubsub.v1.Topic".
  string resource_type = 1;

  // The name of the resource being accessed.  For example, a shared calendar
  // name: "example.com_4fghdhgsrgh@group.calendar.google.com", if the current
  // error is [google.rpc.Code.PERMISSION_DENIED][google.rpc.Code.PERMISSION_DENIED].
  string resource_name = 2;

  // The owner of the resource (optional).
  // For example, "user:<owner email>" or "project:<Google developer project
  // id>".
  string owner = 3;

  // Describes what error is encountered when accessing this resource.
  // For example, updating a cloud project may require the `writer` permission
  // on the developer console project.
  string description = 4;
}

// Provides links to documentation or for performing an out of band action.
//
// For example, if a quota check failed with an error indicating the calling
// project hasn't enabled the accessed service, this can contain a URL pointing
// directly to the right place in the developer console to flip the bit.
message Help {
  // Describes a URL link.
  message Link {
    // Describes what the link offers.
    string description = 1;

    // The URL of the link.
    string url = 2;
  }

  // URL(s) pointing to additional information on handling the current error.
  repeated Link links = 1;
}

// Provides a localized error message that is safe to return to the user
// which can be attached to an RPC error.
message LocalizedMessage {
  // The locale used following the specification defined at
  // http://www.rfc-editor.org/rfc/bcp/bcp47.txt.
  // Examples are: "en-US", "fr-CH", "es-MX"
  string locale = 1;

  // The localized error message in the above locale.
  string message = 2;
}
