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influxdb-client-csharp

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This repository contains the reference C# client for the InfluxDB 2.0.

Note: This library is for use with InfluxDB 2.x. For connecting to InfluxDB 1.x instances, please use the influxdb-csharp client.

Features

  • Supports querying using the Flux language over the InfluxDB 1.7+ REST API (/api/v2/query endpoint)
  • InfluxDB 2.0 client
    • Querying data using the Flux language
    • Writing data using
    • InfluxDB 2.0 Management API client for managing
      • sources, buckets
      • tasks
      • authorizations
      • health check
      • ...

Documentation

The C# clients are implemented for the InfluxDB 2.0 and InfluxDB 1.7+:

Client Description Documentation Compatibility
Client The reference C# client that allows query, write and InfluxDB 2.0 management. readme 2.0
Client.Legacy The reference C# client that allows you to perform Flux queries against InfluxDB 1.7+. readme 1.7+

How To Use

This clients are a work in progress and hosted in Bonitoo.io Nuget Repository.

If you want to use it with a .Net CLI or Package Manager, you have to specify source of packages. See examples below.

Writes and Queries in InfluxDB 2.0

The following example demonstrates how to write data to InfluxDB 2.0 and read them back using the Flux language:

Installation

Use the latest version:

.Net CLI
dotnet add package InfluxDB.Client
Or when using Package Manager
Install-Package InfluxDB.Client
using System;
using InfluxDB.Client;
using InfluxDB.Client.Api.Domain;
using InfluxDB.Client.Core;
using InfluxDB.Client.Writes;
using Task = System.Threading.Tasks.Task;

namespace Examples
{
    public static class QueriesWritesExample
    {
        private static readonly char[] Token = "".ToCharArray();

        public static async Task Main(string[] args)
        {
            var influxDBClient = InfluxDBClientFactory.Create("http://localhost:9999", Token);

            //
            // Write Data
            //
            using (var writeApi = influxDBClient.GetWriteApi())
            {
                //
                // Write by Point
                //
                var point = PointData.Measurement("temperature")
                    .Tag("location", "west")
                    .Field("value", 55D)
                    .Timestamp(DateTime.UtcNow.AddSeconds(-10), WritePrecision.Ns);
                
                writeApi.WritePoint("bucket_name", "org_id", point);
                
                //
                // Write by LineProtocol
                //
                writeApi.WriteRecord("bucket_name", "org_id", WritePrecision.Ns, "temperature,location=north value=60.0");
                
                //
                // Write by POCO
                //
                var temperature = new Temperature {Location = "south", Value = 62D, Time = DateTime.UtcNow};
                writeApi.WriteMeasurement("bucket_name", "org_id", WritePrecision.Ns, temperature);
            }
            
            //
            // Query data
            //
            var flux = "from(bucket:\"temperature-sensors\") |> range(start: 0)";

            var fluxTables = await influxDBClient.GetQueryApi().QueryAsync(flux, "org_id");
            fluxTables.ForEach(fluxTable =>
            {
                var fluxRecords = fluxTable.Records;
                fluxRecords.ForEach(fluxRecord =>
                {
                    Console.WriteLine($"{fluxRecord.GetTime()}: {fluxRecord.GetValue()}");
                });
            });

            influxDBClient.Dispose();
        }
        
        [Measurement("temperature")]
        private class Temperature
        {
            [Column("location", IsTag = true)] public string Location { get; set; }

            [Column("value")] public double Value { get; set; }

            [Column(IsTimestamp = true)] public DateTime Time;
        }
    }
}

Use Management API to create a new Bucket in InfluxDB 2.0

The following example demonstrates how to use a InfluxDB 2.0 Management API. For further information see client documentation.

Installation

Use the latest version:

.Net CLI
dotnet add package InfluxDB.Client
Or when using Package Manager
Install-Package InfluxDB.Client
using System.Collections.Generic;
using InfluxDB.Client;
using InfluxDB.Client.Api.Domain;
using Task = System.Threading.Tasks.Task;

namespace Examples
{
    public static class ManagementExample
    {
        private static readonly char[] Token = "".ToCharArray();

        public static async Task Main(string[] args)
        {
            var influxDBClient = InfluxDBClientFactory.Create("http://localhost:9999", Token);

            //
            // Create bucket "iot_bucket" with data retention set to 3,600 seconds
            //
            var retention = new BucketRetentionRules(BucketRetentionRules.TypeEnum.Expire, 3600);

            var bucket = await influxDBClient.GetBucketsApi().CreateBucketAsync("iot_bucket", retention, "org_id");
            
            //
            // Create access token to "iot_bucket"
            //
            var resource = new PermissionResource{Id = bucket.Id, OrgID = "org_id",Type = PermissionResource.TypeEnum.Buckets};

            // Read permission
            var read = new Permission{Resource = resource, Action = Permission.ActionEnum.Read};
            
            // Write permission
            var write = new Permission{Resource = resource, Action = Permission.ActionEnum.Write};

            var authorization = await influxDBClient.GetAuthorizationsApi()
                .CreateAuthorizationAsync("org_id", new List<Permission> {read, write});

            
            //
            // Created token that can be use for writes to "iot_bucket"
            //
            var token = authorization.Token;
            
            influxDBClient.Dispose();
        }        
    }
}

Flux queries in InfluxDB 1.7+

The following example demonstrates querying using the Flux language.

Installation

Use the latest version:

.Net CLI
dotnet add package InfluxDB.Client.Flux
Or when using Package Manager
Install-Package InfluxDB.Client.Flux
using System;
using InfluxDB.Client.Flux;

namespace Examples
{
    public static class FluxExample
    {
        public static void Run()
        {
            var fluxClient = FluxClientFactory.Create("http://localhost:8086/");

            var fluxQuery = "from(bucket: \"telegraf\")\n"
                               + " |> filter(fn: (r) => (r[\"_measurement\"] == \"cpu\" AND r[\"_field\"] == \"usage_system\"))"
                               + " |> range(start: -1d)"
                               + " |> sample(n: 5, pos: 1)";

            fluxClient.QueryAsync(fluxQuery, (cancellable, record) =>
                            {
                                // process the flux query records
                                Console.WriteLine(record.GetTime() + ": " + record.GetValue());
                            },
                            (error) =>
                            {
                                // error handling while processing result
                                Console.WriteLine(error.ToString());

                            }, () =>
                            {
                                // on complete
                                Console.WriteLine("Query completed");
                            }).GetAwaiter().GetResult();
        }
    }
}

Contributing

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.

License

The InfluxDB 2.0 Clients are released under the MIT License.

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