Help Center/ Log Tank Service/ API Reference/ APIs/ Log Management/ Querying Structured Logs (Not Recommended)

Updated on 2024-08-29 GMT+08:00

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Querying Structured Logs (Not Recommended)

Function

This API is used to query structured logs in a specified log stream. (It will be brought offline on July 30, 2024.)

Calling Method

For details, see Calling APIs.

URI

POST /v2/{project_id}/groups/{log_group_id}/streams/{log_stream_id}/struct-content/query

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details about how to obtain a project ID, see Obtaining the Project ID, Account ID, Log Group ID, and Log Stream ID.
log_group_id	Yes	String	Log group ID. For details about how to obtain a log group ID, see Obtaining the Project ID, Account ID, Log Group ID, and Log Stream ID.
log_stream_id	Yes	String	Log stream ID. For details about how to obtain a log stream ID, see Obtaining the Project ID, Account ID, Log Group ID, and Log Stream ID.

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token obtained from IAM. For details about how to obtain a user token, see Obtaining a User Token.
Content-Type	Yes	String	Set this parameter to application/json;charset=UTF-8.

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
start_time	Yes	String	UTC start time of the search window (in milliseconds).
end_time	Yes	String	UTC end time of the search window (in milliseconds).
sql_expression	No	String	SQL statement used for search. GROUP BY, LIKE, WHERE, and SELECT are supported. The default value is SELECT *.
original_content	No	Boolean	Whether raw logs are returned. The default value is false.

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
struct_logs	Array of StructLogContents objects	Log information.

**Table 5** StructLogContents
Parameter	Type	Description
log_content	String	Raw log data.
line_num	String	Sequence number of a log line.

Status code: 400

**Table 6** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 401

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 403

**Table 8** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Status code: 500

**Table 9** Response body parameters
Parameter	Type	Description
error_code	String	Error code.
error_msg	String	Error message.

Example Requests

Querying structured logs

POST https://{endpoint}/v2/{project_id}/groups/{log_group_id}/streams/{log_stream_id}/struct-content/query

When sql_expression is set to **select ***:

v2/{project_id}/groups/{log_group_id}/streams/{log_stream_id}/struct-content/query

{
  "start_time" : "1595811590539",
  "end_time" : "1595811593539",
  "original_content" : "true",
  "sql_expression" : "select *"
}

When sql_expression is set to select count(test3), sum(test4):

{
  "start_time" : "1595811590539",
  "end_time" : "1595811593539",
  "sql_expression" : "select count(test3), sum(test4)"
}

When sql_expression is set to select count(test3), sum(test4) group by(test1):

{
  "start_time" : "1595811590539",
  "end_time" : "1595811593539",
  "sql_expression" : "select count(test3), sum(test4) group by(test1)"
}

Example Responses

Status code: 200

The request is successful.

When sql_expression is set to **select ***:

{
  "struct_logs" : [ {
    "test4" : "151687",
    "test2" : "08:59:53",
    "test3" : "this",
    "line_num" : "1595811593539371695",
    "log_content" : "2020-07-27/08:59:53 this log is Error NO 151687",
    "test1" : "2020-07-27"
  }, {
    "test4" : "151686",
    "test2" : "08:59:52",
    "test3" : "this",
    "line_num" : "1595811592539361171",
    "log_content" : "2020-07-27/08:59:52 this log is Error NO 151686",
    "test1" : "2020-07-27"
  }, {
    "test4" : "151685",
    "test2" : "08:59:51",
    "test3" : "this",
    "line_num" : "1595811591539422860",
    "log_content" : "2020-07-27/08:59:51 this log is Error NO 151685",
    "test1" : "2020-07-27"
  }, {
    "test4" : "151684",
    "test2" : "08:59:50",
    "test3" : "this",
    "line_num" : "1595811590539454127",
    "log_content" : "2020-07-27/08:59:50 this log is Error NO 151684",
    "test1" : "2020-07-27"
  } ]
}

When sql_expression is set to select count(test3), sum(test4):

{
  "struct_logs" : [ {
    "cnt(test3)" : "4",
    "sum(test4)" : "606742.000"
  } ]
}

When sql_expression is set to select count(test3), sum(test4) group by(test1):

{
  "struct_logs" : [ {
    "cnt(test3)" : "4",
    "sum(test4)" : "606742.000",
    "test1" : "2020-07-27"
  } ]
}

When sql_expression is set to select count(test3), sum(test4) group by(test1):

{
  "struct_logs" : [ {
    "cnt(test3)" : "4",
    "sum(test4)" : "606742.000",
    "test1" : "2020-07-27"
  } ]
}

Status code: 400

Bad Request: The request is invalid. Modify the request based on the description in error_msg before a retry.

{
  "error_code" : "LTS.0009",
  "error_msg" : "Failed to validate the request body"
}

Status code: 401

AuthFailed. Authentication failed. Check the token and try again.

{
  "error_code" : "LTS.0414",
  "error_msg" : "Invalid token"
}

Status code: 403

Forbidden.The request has been rejected.The server has received the request and understood it, but refuses to respond to it. The client should not repeat the request without modifications.

{
  "error_code" : "LTS.0001",
  "error_msg" : "Invalid projectId"
}

Status code: 500

InternalServerError.

The server has received the request but encountered an internal error.

{
  "error_code" : "LTS.0202",
  "error_msg" : "Failed to query lts struct log"
}

SDK Sample Code

The SDK sample code is as follows.

When sql_expression is set to **select ***:

        
         
           
           
             package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.lts.v2.region.LtsRegion;
import com.huaweicloud.sdk.lts.v2.*;
import com.huaweicloud.sdk.lts.v2.model.*;


public class ListQueryStructuredLogsSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        LtsClient client = LtsClient.newBuilder()
                .withCredential(auth)
                .withRegion(LtsRegion.valueOf("<YOUR REGION>"))
                .build();
        ListQueryStructuredLogsRequest request = new ListQueryStructuredLogsRequest();
        request.withLogGroupId("{log_group_id}");
        request.withLogStreamId("{log_stream_id}");
        QueryLtsStructLogParams body = new QueryLtsStructLogParams();
        body.withOriginalContent(true);
        body.withSqlExpression("select *");
        body.withEndTime("1595811593539");
        body.withStartTime("1595811590539");
        request.withBody(body);
        try {
            ListQueryStructuredLogsResponse response = client.listQueryStructuredLogs(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

            

          

        
       

When sql_expression is set to select count(test3), sum(test4):

        
         
           
           
             package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.lts.v2.region.LtsRegion;
import com.huaweicloud.sdk.lts.v2.*;
import com.huaweicloud.sdk.lts.v2.model.*;


public class ListQueryStructuredLogsSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        LtsClient client = LtsClient.newBuilder()
                .withCredential(auth)
                .withRegion(LtsRegion.valueOf("<YOUR REGION>"))
                .build();
        ListQueryStructuredLogsRequest request = new ListQueryStructuredLogsRequest();
        request.withLogGroupId("{log_group_id}");
        request.withLogStreamId("{log_stream_id}");
        QueryLtsStructLogParams body = new QueryLtsStructLogParams();
        body.withSqlExpression("select count(test3), sum(test4)");
        body.withEndTime("1595811593539");
        body.withStartTime("1595811590539");
        request.withBody(body);
        try {
            ListQueryStructuredLogsResponse response = client.listQueryStructuredLogs(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

            

          

        
       

When sql_expression is set to select count(test3), sum(test4) group by(test1):

        
         
           
           
             package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.lts.v2.region.LtsRegion;
import com.huaweicloud.sdk.lts.v2.*;
import com.huaweicloud.sdk.lts.v2.model.*;


public class ListQueryStructuredLogsSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        LtsClient client = LtsClient.newBuilder()
                .withCredential(auth)
                .withRegion(LtsRegion.valueOf("<YOUR REGION>"))
                .build();
        ListQueryStructuredLogsRequest request = new ListQueryStructuredLogsRequest();
        request.withLogGroupId("{log_group_id}");
        request.withLogStreamId("{log_stream_id}");
        QueryLtsStructLogParams body = new QueryLtsStructLogParams();
        body.withSqlExpression("select count(test3), sum(test4) group by(test1)");
        body.withEndTime("1595811593539");
        body.withStartTime("1595811590539");
        request.withBody(body);
        try {
            ListQueryStructuredLogsResponse response = client.listQueryStructuredLogs(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

            

          

        
       

When sql_expression is set to **select ***:

        
         
           
           
             # coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdklts.v2.region.lts_region import LtsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdklts.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = LtsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(LtsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ListQueryStructuredLogsRequest()
        request.log_group_id = "{log_group_id}"
        request.log_stream_id = "{log_stream_id}"
        request.body = QueryLtsStructLogParams(
            original_content=True,
            sql_expression="select *",
            end_time="1595811593539",
            start_time="1595811590539"
        )
        response = client.list_query_structured_logs(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

            

          

        
       

When sql_expression is set to select count(test3), sum(test4):

        
         
           
           
             # coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdklts.v2.region.lts_region import LtsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdklts.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = LtsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(LtsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ListQueryStructuredLogsRequest()
        request.log_group_id = "{log_group_id}"
        request.log_stream_id = "{log_stream_id}"
        request.body = QueryLtsStructLogParams(
            sql_expression="select count(test3), sum(test4)",
            end_time="1595811593539",
            start_time="1595811590539"
        )
        response = client.list_query_structured_logs(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

            

          

        
       

When sql_expression is set to select count(test3), sum(test4) group by(test1):

        
         
           
           
             # coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdklts.v2.region.lts_region import LtsRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdklts.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = LtsClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(LtsRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ListQueryStructuredLogsRequest()
        request.log_group_id = "{log_group_id}"
        request.log_stream_id = "{log_stream_id}"
        request.body = QueryLtsStructLogParams(
            sql_expression="select count(test3), sum(test4) group by(test1)",
            end_time="1595811593539",
            start_time="1595811590539"
        )
        response = client.list_query_structured_logs(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

            

          

        
       

When sql_expression is set to **select ***:

        
         
           
           
             package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    lts "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := lts.NewLtsClient(
        lts.LtsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ListQueryStructuredLogsRequest{}
	request.LogGroupId = "{log_group_id}"
	request.LogStreamId = "{log_stream_id}"
	originalContentQueryLtsStructLogParams:= true
	sqlExpressionQueryLtsStructLogParams:= "select *"
	request.Body = &model.QueryLtsStructLogParams{
		OriginalContent: &originalContentQueryLtsStructLogParams,
		SqlExpression: &sqlExpressionQueryLtsStructLogParams,
		EndTime: "1595811593539",
		StartTime: "1595811590539",
	}
	response, err := client.ListQueryStructuredLogs(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

            

          

        
       

When sql_expression is set to select count(test3), sum(test4):

        
         
           
           
             package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    lts "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := lts.NewLtsClient(
        lts.LtsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ListQueryStructuredLogsRequest{}
	request.LogGroupId = "{log_group_id}"
	request.LogStreamId = "{log_stream_id}"
	sqlExpressionQueryLtsStructLogParams:= "select count(test3), sum(test4)"
	request.Body = &model.QueryLtsStructLogParams{
		SqlExpression: &sqlExpressionQueryLtsStructLogParams,
		EndTime: "1595811593539",
		StartTime: "1595811590539",
	}
	response, err := client.ListQueryStructuredLogs(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

            

          

        
       

When sql_expression is set to select count(test3), sum(test4) group by(test1):

        
         
           
           
             package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    lts "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/lts/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := lts.NewLtsClient(
        lts.LtsClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ListQueryStructuredLogsRequest{}
	request.LogGroupId = "{log_group_id}"
	request.LogStreamId = "{log_stream_id}"
	sqlExpressionQueryLtsStructLogParams:= "select count(test3), sum(test4) group by(test1)"
	request.Body = &model.QueryLtsStructLogParams{
		SqlExpression: &sqlExpressionQueryLtsStructLogParams,
		EndTime: "1595811593539",
		StartTime: "1595811590539",
	}
	response, err := client.ListQueryStructuredLogs(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

            

          

        
       

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code	Description
200	The request is successful.
400	Bad Request: The request is invalid. Modify the request based on the description in error_msg before a retry.
401	AuthFailed. Authentication failed. Check the token and try again.
403	Forbidden.The request has been rejected.The server has received the request and understood it, but refuses to respond to it. The client should not repeat the request without modifications.
500	InternalServerError. The server has received the request but encountered an internal error.