This repository contains the reference Dart client for the InfluxDB 2.x. It works on all platforms including web, server, and Flutter. Please submit issues and pull requests, help out, or just give encouragement.
This section contains links to the client library documentation.
InfluxDB 2.x client supports:
- Querying data using the Flux language
- Streaming result to
Stream<FluxRecord>
- Streaming result to
- Writing data
- batched in chunks on background
- automatic retries on write failures
- Management API
- provides all other InfluxDB 2.x APIs for managing
- health check
- sources, buckets
- tasks
- authorizations
- ...
- provides all other InfluxDB 2.x APIs for managing
Library works in web, server, and Flutter.
Dart developer can add it as a dependency in their pubspec.yaml:
dependencies:
influxdb_client: ^2.2.0import 'package:influxdb_client/api.dart';Important: You should call
close()at the end of your application to release allocated resources.
Specify url and token via parameters:
var client = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
debug: true);| Option | Description | Type | Default |
|---|---|---|---|
| url | InfluxDB url | String | none |
| bucket | Default destination bucket for writes | String | none |
| org | Default organization bucket for writes | String | none |
| debug | Enable verbose logging of underlying http client | bool | false |
var client = InfluxDBClient.connectV1(
url: 'http://localhost:8086',
database: 'mydb',
retentionPolicy: 'autogen',
username: 'my-username',
password: 'my-password',
);The WriteApi supports asynchronous writes into InfluxDB 2.x.
The data could be written as:
Stringthat is formatted as a InfluxDB's Line Protocol- Data Point structure
- Array of above items
The following example demonstrates how to write data with different type of records. For further information see docs and examples.
import 'package:influxdb_client/api.dart';
main() async {
var client = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
debugEnabled: true);
var writeApi = WriteService(client);
var point = Point('h2o')
.addTag('location', 'Prague')
.addField('level', 1.12345)
.time(DateTime.now().toUtc());
await writeApi.write(point).then((value) {
print('Write completed 1');
}).catchError((exception) {
// error block
print("Handle write error here!");
print(exception);
});
}
Settings for WriteService like batching, default tags, retry strategy, precision,
can customized in `WriteOptions'.
Example how to modify default WriteOptions:
var client = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
debug: true);
var writeApi = client.getWriteService(WriteOptions().merge(
precision: WritePrecision.s,
batchSize: 100,
flushInterval: 5000,
gzip: true));
- sources - write_example
The result retrieved by QueryService could be formatted as a:
import 'package:influxdb_client/api.dart';
void main() async {
var client = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
);
var queryService = client.getQueryService();
var recordStream = await queryService.query('''
from(bucket: "my-bucket")
|> range(start: 0)
|> filter(fn: (r) => r["_measurement"] == "cpu")
|> filter(fn: (r) => r["cpu"] == "cpu-total")
|> aggregateWindow(every: 1m, fn: mean, createEmpty: false)
|> yield(name: "mean")
''');
var count = 0;
await recordStream.forEach((record) {
print(
'record: ${count++} ${record['_time']}: ${record['host']} ${record['cpu']} ${record['_value']}');
});
client.close();
}
import 'package:influxdb_client/api.dart';
main() async {
var client = InfluxDBClient(url: 'http://localhost:8086',
token: 'my-token', org: 'my-org', bucket: 'my-bucket');
var queryService = client.getQueryService(client);
var rawCSV = await queryService.queryRaw('''
from(bucket: "my-bucket")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "h2o")
|> aggregateWindow(every: v.windowPeriod, fn: mean, createEmpty: false)
|> yield(name: "mean")''');
print(rawCSV);
}
InfluxDB Cloud supports Parameterized Queries that let you dynamically change values in a query using the InfluxDB API. Parameterized queries make Flux queries more reusable and can also be used to help prevent injection attacks.
InfluxDB Cloud inserts the params object into the Flux query as a Flux record named params. Use dot or bracket
notation to access parameters in the params record in your Flux query. Parameterized Flux queries support only int
, float, and string data types. To convert the supported data types into
other Flux basic data types, use Flux type conversion functions.
Parameterized query example:
⚠️ Parameterized Queries are supported only in InfluxDB Cloud, currently there is no support in InfluxDB OSS.
import 'package:influxdb_client/api.dart';
void main() async {
var client = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
);
var queryService = client.getQueryService();
var queryService = client.getQueryService();
var queryString = '''
from(bucket: params.bucketParam)
|> range(start: duration(v: params.startParam))
|> filter(fn: (r) => r["_measurement"] == "weather"
and r["location"] == "Prague")''';
var queryParams = {'bucketParam':'my-bucket', 'startParam':'-10d'};
var query = Query(query: queryString, params: queryParams);
// Using string for query and Map for params
var recordMap = await queryService.query(queryString, params: queryParams);
// Using Query class
var recordClass = await queryService.query(query);
client.close();
}
The DeleteService supports deletes points from an InfluxDB bucket.
InfluxDB uses an InfluxQL-like predicate syntax to determine what data points to delete.
import 'package:influxdb_client/api.dart';
void main() async {
var client = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
debugEnabled: true);
await client
.getDeleteService()
.delete(
predicate: '_measurement="temperature"',
start: '1970-01-01T00:00:00.000000001Z',
stop: DateTime.now().toUtc().toIso8601String(),
bucket: 'my-bucket',
org: 'my-org')
.catchError((e) => print(e));
var queryService = client.getQueryService();
var fluxQuery = '''
from(bucket: "my-bucket")
|> range(start: -1d)
|> filter(fn: (r) => r["_measurement"] == "temperature")
''';
// should be empty
var records = await queryService.query(fluxQuery);
assert(await records.isEmpty);
client.close();
}The client supports following management API:
The following example demonstrates how to use a InfluxDB 2.x Management API to create new bucket. For further information see docs and examples.
import 'package:influxdb_client/api.dart';
void main() async {
// Initialize Client and API
var client = InfluxDBClient(
url: 'http://localhost:8086', token: 'my-token', org: 'my-org');
//check server availability
await client.getPingApi().getPing();
var orgs = await client.getOrganizationsApi().getOrgs();
var myOrgId = orgs.orgs.first.id;
var bucketsApi = client.getBucketsApi();
var bucketName = 'bucket-my-org';
// find and delete bucket 'bucket-my-org'
var buckets = await bucketsApi.getBuckets(name: bucketName);
if (buckets.buckets.isNotEmpty) {
var bucketID = buckets.buckets.first.id;
await bucketsApi.deleteBucketsID(bucketID);
print('Bucket $bucketID was deleted.');
}
// Bucket configuration
var request = PostBucketRequest(
orgID: myOrgId,
name: bucketName,
retentionRules: [
RetentionRule(type: RetentionRuleTypeEnum.expire, everySeconds: 3600)
]);
var bucket = await bucketsApi.postBuckets(request);
// Create Authorization with permission to read/write created bucket
var bucketResource =
Resource(type: ResourceTypeEnum.buckets, id: bucket.id, orgID: myOrgId);
// Authorization configuration
var auth = AuthorizationPostRequest(
description: 'Authorization to read/write bucket:${bucket.name}',
orgID: myOrgId,
permissions: [
Permission(action: PermissionActionEnum.read, resource: bucketResource),
Permission(action: PermissionActionEnum.write, resource: bucketResource)
]);
// Create Authorization
var authorizationsApi = client.getAuthorizationsApi();
var authorization = await authorizationsApi.postAuthorizations(auth);
// Print token
var token = authorization.token;
print('The bucket: \'${bucket.name}\' is successfully created.');
print('The following token can be used to read/write: ${token}');
client.close();
}
By default the HttpClient uses the proxy configuration available from the environment, see findProxyFromEnvironment.
export http_proxy="PROXY http://localhost:8080"
Initialize a proxy from code:
HttpClient httpClient = HttpClient();
httpClient.findProxy = (url) => "PROXY localhost:8080";
var client = IOClient(httpClient);
var influxdb = InfluxDBClient(
url: 'http://localhost:8086',
token: 'my-token',
org: 'my-org',
bucket: 'my-bucket',
client: client,
followRedirects: true,
maxRedirects: 5,
debug: true);To turn off the use of proxies set the findProxy property to null.
Client automatically follows HTTP redirects for all GET and HEAD requests with status codes 301, 302, 303, 307, 308. The default redirect policy is to follow up to 5 consecutive requests.
write and query APIs also support an automatic redirect of POST requests. You can disable followRedirects
and change default maxRedirects on InfluxDBClient instance.
If you would like to contribute code you can do through GitHub by forking the repository and sending a pull request into the master branch.
Build Requirements:
- dart 2.X
Build source and test targets:
./scripts/influxdb-restart.sh
dart testCheck code coverage:
./scripts/influxdb-restart.sh
dart test --enable-code-coverageThe client is available as open source under the terms of the MIT License.
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