harmony 鸿蒙@ohos.logLibrary (Log Library)

2023-06-24
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@ohos.logLibrary (Log Library)

The logLibrary module provides APIs for obtaining various system maintenance and test logs.

NOTE

The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.

The APIs provided by this module are system APIs.

Modules to Import

import logLibrary from '@ohos.logLibrary';

LogEntry

Defines a LogEntry object.

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Name	Type	Readable	Writable	Description
name	string	Yes	No	Log file name.
mtime	number	Yes	No	Time of the last modification to the file. The value is the number of seconds elapsed since 00:00:00 on January 1, 1970.
size	number	Yes	No	File size, in bytes.

logLibrary.list

list(logType: string): LogEntry[]

Obtains the list of log files of the specified type in synchronous mode. This API accepts objects of the string type as input parameters and returns a list log files of the specified type.

Required permission: ohos.permission.READ_HIVIEW_SYSTEM

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Parameters

Name	Type	Mandatory	Description
logType	string	Yes	Log type, for example, HILOG, FAULTLOG, BETACLUB, or REMOTELOG.

Return value

Type	Description
LogEntry[]	Array of log file objects.

Error codes

For details about error codes, see Log Library Error Codes.

ID	Error Message
201	Permission denied.
202	Permission denied, non-system app called system api.
401	Invalid argument.

Example

import logLibrary from '@ohos.logLibrary';

try {
    let logObj = logLibrary.list('HILOG');
    // do something here.
} catch (error) {
    console.error(`error code: ${error?.code}, error msg: ${error?.message}`);
}

logLibrary.copy

copy(logType: string, logName: string, dest: string): Promise<void>

Copies log files of the specified type to the target application directory. This API uses a promise to return the result.

Required permission: ohos.permission.READ_HIVIEW_SYSTEM

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Parameters

Name	Type	Mandatory	Description
logType	string	Yes	Log type, for example, HILOG, FAULTLOG, BETACLUB, or REMOTELOG.
logName	string	Yes	Log file name.
dest	string	Yes	Target directory. Enter the relative path of the directory. If this parameter is specified, log files will be saved to the hiview/dest folder in the application cache path, that is, ../cache/hiview/dest. You can enter a multi-level directory. If you leave this parameter empty, log files will be saved to the root directory, that is, the hiview folder in the application cache path.

Return value

Type	Description
Promise<void>	Promise used to return the result. Depending on whether the operation is successful, you can use the then() or catch() method to process the callback.

Error codes

For details about error codes, see Log Library Error Codes.

ID	Error Message
201	Permission denied.
202	Permission denied, non-system app called system api.
401	Invalid argument.
21300001	Source file does not exists.

Example

import logLibrary from '@ohos.logLibrary';
import { BusinessError } from '@ohos.base';

try {
    logLibrary.copy('HILOG', 'hiapplogcat-1.zip', ''
    ).then(
        (val) => {
            // do something here.
        }
    ).catch(
        (err: BusinessError) => {
            // do something here.
        }
    )
} catch (error) {
    console.error(`error code: ${error?.code}, error msg: ${error?.message}`);
}

logLibrary.copy

copy(logType: string, logName: string, dest: string, callback: AsyncCallback<void>): void

Copies log files of the specified type to the target application directory. This API uses an asynchronous callback to return the result.

Required permission: ohos.permission.READ_HIVIEW_SYSTEM

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Parameters

Name	Type	Mandatory	Description
logType	string	Yes	Log type, for example, HILOG, FAULTLOG, BETACLUB, or REMOTELOG.
logName	string	Yes	Log file name.
dest	string	Yes	Target directory. Enter the relative path of the directory. If this parameter is specified, log files will be saved to the hiview/dest folder in the application cache path, that is, ../cache/hiview/dest. You can enter a multi-level directory. If you leave this parameter empty, log files will be saved to the root directory, that is, the hiview folder in the application cache path.
callback	AsyncCallback<void>	Yes	Callback used to process the received return value. The value 0 indicates that the operation is successful, and any other value indicates that the operation has failed.

Error codes

For details about error codes, see Log Library Error Codes.

ID	Error Message
201	Permission denied.
202	Permission denied, non-system app called system api.
401	Invalid argument.
21300001	Source file does not exists.

Example

import logLibrary from '@ohos.logLibrary';

try {
    logLibrary.copy('HILOG', 'hiapplogcat-1.zip', 'dir1', (error, val) => {
        if (val === undefined) {
            // copy failed.
        } else {
            // copy success.
        }
    });
} catch (error) {
    console.error(`error code: ${error?.code}, error msg: ${error?.message}`);
}

logLibrary.move

move(logType: string, logName: string, dest: string): Promise<void>

Moves log files of the specified type to the target application directory. This API uses a promise to return the result.

Required permission: ohos.permission.WRITE_HIVIEW_SYSTEM

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Parameters

Name	Type	Mandatory	Description
logType	string	Yes	Log type, for example, FAULTLOG, BETACLUB, or REMOTELOG.
logName	string	Yes	Log file name.
dest	string	Yes	Target directory. Enter the relative path of the directory. If this parameter is specified, log files will be saved to the hiview/dest folder in the application cache path, that is, ../cache/hiview/dest. You can enter a multi-level directory. If you leave this parameter empty, log files will be saved to the root directory, that is, the hiview folder in the application cache path.

Return value

Type	Description
Promise<void>	Promise used to return the result. Depending on whether the operation is successful, you can use the then() or catch() method to process the callback.

Error codes

For details about error codes, see Log Library Error Codes.

ID	Error Message
201	Permission denied.
202	Permission denied, non-system app called system api.
401	Invalid argument.
21300001	Source file does not exists.

Example

import logLibrary from '@ohos.logLibrary';
import { BusinessError } from '@ohos.base';

try {
    logLibrary.move('FAULTLOG', 'fault_log_test.zip', ''
    ).then(
        (val) => {
            // do something here.
        }
    ).catch(
        (err: BusinessError) => {
            // do something here.
        }
    )
} catch (error) {
    console.error(`error code: ${error?.code}, error msg: ${error?.message}`);
}

logLibrary.move

move(logType: string, logName: string, dest: string, callback: AsyncCallback<void>): void

Moves log files of the specified type to the target application directory. This API uses an asynchronous callback to return the result.

Required permission: ohos.permission.WRITE_HIVIEW_SYSTEM

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Parameters

Name	Type	Mandatory	Description
logType	string	Yes	Log type, for example, HILOG, FAULTLOG, BETACLUB, or REMOTELOG.
logName	string	Yes	Log file name.
dest	string	Yes	Target directory. Enter the relative path of the directory. If this parameter is specified, log files will be saved to the hiview/dest folder in the application cache path, that is, ../cache/hiview/dest. You can enter a multi-level directory. If you leave this parameter empty, log files will be saved to the root directory, that is, the hiview folder in the application cache path.
callback	AsyncCallback<void>	Yes	Callback used to process the received return value. The value 0 indicates that the operation is successful, and any other value indicates that the operation has failed.

Error codes

For details about error codes, see Log Library Error Codes.

ID	Error Message
201	Permission denied.
202	Permission denied, non-system app called system api.
401	Invalid argument.
21300001	Source file does not exists.

Example

import logLibrary from '@ohos.logLibrary';

try {
    logLibrary.move('FAULTLOG', 'fault_log_test.zip', 'dir1/dir2', (error, val) => {
        if (val === undefined) {
            // move failed.
        } else {
            // move success.
        }
    });
} catch (error) {
    console.error(`error code: ${error?.code}, error msg: ${error?.message}`);
}

logLibrary.remove

remove(logType: string, logName: string): void

Deletes log files of the specified type in synchronous mode.

Required permission: ohos.permission.WRITE_HIVIEW_SYSTEM

System capability: SystemCapability.HiviewDFX.Hiview.LogLibrary

Parameters

Name	Type	Mandatory	Description
logType	string	Yes	Log type, for example, FAULTLOG, BETACLUB, or REMOTELOG.
logName	string	Yes	Log file name.

Error codes

For details about error codes, see Log Library Error Codes.

ID	Error Message
201	Permission denied.
202	Permission denied, non-system app called system api.
401	Invalid argument.
21300001	Source file does not exists.

Example

import logLibrary from '@ohos.logLibrary';

try {
  logLibrary.remove('FAULTLOG', 'fault_log_test.zip');
} catch (error) {
  console.error(`error code: ${error?.code}, error msg: ${error?.message}`);
}