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CustomDomainMappingAndLinq.cs
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CustomDomainMappingAndLinq.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using InfluxDB.Client;
using InfluxDB.Client.Api.Domain;
using InfluxDB.Client.Core.Flux.Domain;
using InfluxDB.Client.Linq;
using InfluxDB.Client.Writes;
namespace Examples
{
public static class CustomDomainMappingAndLinq
{
/// <summary>
/// Define Domain Object
/// </summary>
private class DomainEntity
{
public Guid SeriesId { get; set; }
public double Value { get; set; }
public DateTimeOffset Timestamp { get; set; }
public ICollection<DomainEntityAttribute> Properties { get; set; }
public override string ToString()
{
return $"{Timestamp:MM/dd/yyyy hh:mm:ss.fff tt} {SeriesId} value: {Value}, " +
$"properties: {string.Join(", ", Properties)}.";
}
}
/// <summary>
/// Attributes of DomainObject
/// </summary>
private class DomainEntityAttribute
{
public string Name { get; set; }
public int Value { get; set; }
public override string ToString()
{
return $"{Name}={Value}";
}
}
/// <summary>
/// Define Custom Domain Object Converter
/// </summary>
private class DomainEntityConverter : IDomainObjectMapper, IMemberNameResolver
{
/// <summary>
/// Convert to DomainObject.
/// </summary>
public T ConvertToEntity<T>(FluxRecord fluxRecord)
{
return (T)ConvertToEntity(fluxRecord, typeof(T));
}
public object ConvertToEntity(FluxRecord fluxRecord, Type type)
{
if (type != typeof(DomainEntity))
{
throw new NotSupportedException($"This converter doesn't supports: {typeof(DomainEntity)}");
}
var customEntity = new DomainEntity
{
SeriesId = Guid.Parse(Convert.ToString(fluxRecord.GetValueByKey("series_id"))!),
Value = Convert.ToDouble(fluxRecord.GetValueByKey("data")),
Timestamp = fluxRecord.GetTime().GetValueOrDefault().ToDateTimeUtc(),
Properties = new List<DomainEntityAttribute>()
};
foreach (var (key, value) in fluxRecord.Values)
if (key.StartsWith("property_"))
{
var attribute = new DomainEntityAttribute
{
Name = key.Replace("property_", string.Empty), Value = Convert.ToInt32(value)
};
customEntity.Properties.Add(attribute);
}
return Convert.ChangeType(customEntity, type);
}
/// <summary>
/// Convert to Point
/// </summary>
public PointData ConvertToPointData<T>(T entity, WritePrecision precision)
{
if (!(entity is DomainEntity ce))
{
throw new NotSupportedException($"This converter doesn't supports: {typeof(DomainEntity)}");
}
var point = PointData
.Measurement("custom_measurement")
.Tag("series_id", ce.SeriesId.ToString())
.Field("data", ce.Value)
.Timestamp(ce.Timestamp, precision);
foreach (var attribute in ce.Properties ?? new List<DomainEntityAttribute>())
point = point.Field($"property_{attribute.Name}", attribute.Value);
Console.WriteLine($"LP: '{point.ToLineProtocol()}'");
return point;
}
/// <summary>
/// How the Domain Object property is mapped into InfluxDB schema. Is it Timestamp, Tag, ...?
/// </summary>
public MemberType ResolveMemberType(MemberInfo memberInfo)
{
switch (memberInfo.Name)
{
case "Timestamp":
return MemberType.Timestamp;
case "Name":
return MemberType.NamedField;
case "Value":
return MemberType.NamedFieldValue;
case "SeriesId":
return MemberType.Tag;
default:
return MemberType.Field;
}
}
/// <summary>
/// How your property is named in InfluxDB.
/// </summary>
public string GetColumnName(MemberInfo memberInfo)
{
switch (memberInfo.Name)
{
case "SeriesId":
return "series_id";
case "Value":
return "data";
default:
return memberInfo.Name;
}
}
/// <summary>
/// Return name for flattened properties.
/// </summary>
public string GetNamedFieldName(MemberInfo memberInfo, object value)
{
return $"property_{Convert.ToString(value)}";
}
}
public static async Task Main()
{
const string host = "http://localhost:9999";
const string token = "my-token";
const string bucket = "my-bucket";
const string organization = "my-org";
var options = new InfluxDBClientOptions(host)
{
Token = token,
Org = organization,
Bucket = bucket
};
var converter = new DomainEntityConverter();
using var client = new InfluxDBClient(options);
//
// Prepare data to write
//
var time = new DateTimeOffset(2020, 11, 15, 8, 20, 15,
new TimeSpan(3, 0, 0));
var entity1 = new DomainEntity
{
Timestamp = time,
SeriesId = Guid.Parse("0f8fad5b-d9cb-469f-a165-70867728950e"),
Value = 15,
Properties = new List<DomainEntityAttribute>
{
new DomainEntityAttribute
{ Name = "height", Value = 4 },
new DomainEntityAttribute
{ Name = "width", Value = 110 }
}
};
var entity2 = new DomainEntity
{
Timestamp = time.AddHours(1),
SeriesId = Guid.Parse("0f8fad5b-d9cb-469f-a165-70867728950e"),
Value = 15,
Properties = new List<DomainEntityAttribute>
{
new DomainEntityAttribute
{ Name = "height", Value = 5 },
new DomainEntityAttribute
{ Name = "width", Value = 160 }
}
};
var entity3 = new DomainEntity
{
Timestamp = time.AddHours(2),
SeriesId = Guid.Parse("7c9e6679-7425-40de-944b-e07fc1f90ae7"),
Value = 15,
Properties = new List<DomainEntityAttribute>
{
new DomainEntityAttribute
{ Name = "height", Value = 5 },
new DomainEntityAttribute
{ Name = "width", Value = 110 }
}
};
var entity4 = new DomainEntity
{
Timestamp = time.AddHours(3),
SeriesId = Guid.Parse("7c9e6679-7425-40de-944b-e07fc1f90ae7"),
Value = 15,
Properties = new List<DomainEntityAttribute>
{
new DomainEntityAttribute
{ Name = "height", Value = 6 },
new DomainEntityAttribute
{ Name = "width", Value = 160 }
}
};
//
// Write data
//
await client.GetWriteApiAsync(converter)
.WriteMeasurementsAsync(new[] { entity1, entity2, entity3, entity4 }, WritePrecision.S);
//
// Query Data to Domain object
//
var queryApi = client.GetQueryApiSync(converter);
//
// Select ALL
//
var query = from s in InfluxDBQueryable<DomainEntity>.Queryable("my-bucket", "my-org", queryApi, converter)
select s;
Console.WriteLine("==== Select ALL ====");
query.ToList().ForEach(it => Console.WriteLine(it.ToString()));
//
// Filter By Tag
//
query = from s in InfluxDBQueryable<DomainEntity>.Queryable("my-bucket", "my-org", queryApi, converter)
where s.SeriesId == Guid.Parse("7c9e6679-7425-40de-944b-e07fc1f90ae7")
select s;
Console.WriteLine("==== Filter by Tag ====");
query.ToList().ForEach(it => Console.WriteLine(it.ToString()));
//
// Use Take + Skip
//
query = (from s in InfluxDBQueryable<DomainEntity>.Queryable("my-bucket", "my-org", queryApi, converter)
select s)
.Take(1)
.Skip(1);
Console.WriteLine("==== Use Take + Skip ====");
query.ToList().ForEach(it => Console.WriteLine(it.ToString()));
//
// Use Time Range
//
query = from s in InfluxDBQueryable<DomainEntity>.Queryable("my-bucket", "my-org", queryApi, converter)
where s.Timestamp > time.AddMinutes(30) && s.Timestamp < time.AddHours(3)
select s;
Console.WriteLine("==== Use Time Range ====");
query.ToList().ForEach(it => Console.WriteLine(it.ToString()));
//
// Use Any
//
query = from s in InfluxDBQueryable<DomainEntity>.Queryable("my-bucket", "my-org", queryApi, converter)
where s.Properties.Any(a => a.Name == "width" && a.Value == 160)
select s;
Console.WriteLine("==== Use Any ====");
query.ToList().ForEach(it => Console.WriteLine(it.ToString()));
//
// Debug Query
//
Console.WriteLine("==== Debug LINQ Queryable Flux output ====");
var influxQuery = ((InfluxDBQueryable<DomainEntity>)query).ToDebugQuery();
foreach (var statement in influxQuery.Extern.Body)
{
var os = statement as OptionStatement;
var va = os?.Assignment as VariableAssignment;
var name = va?.Id.Name;
var value = va?.Init.GetType().GetProperty("Value")?.GetValue(va.Init, null);
Console.WriteLine($"{name}={value}");
}
Console.WriteLine();
Console.WriteLine(influxQuery._Query);
}
}
}