Created
January 6, 2019 19:43
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DbConnectionHealthCheck.cs
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| using Microsoft.Extensions.Diagnostics.HealthChecks; | |
| using System; | |
| using System.Collections.Generic; | |
| using System.Data.Common; | |
| using System.Linq; | |
| using System.Threading; | |
| using System.Threading.Tasks; | |
| namespace WebApplication19.Checks | |
| { | |
| public abstract class DbConnectionHealthCheck : IHealthCheck | |
| { | |
| protected DbConnectionHealthCheck(string connectionString) | |
| : this(connectionString, testQuery: null) | |
| { | |
| } | |
| protected DbConnectionHealthCheck(string connectionString, string testQuery) | |
| { | |
| ConnectionString = connectionString ?? throw new ArgumentNullException(nameof(connectionString)); | |
| TestQuery = testQuery; | |
| } | |
| protected string ConnectionString { get; } | |
| // This sample supports specifying a query to run as a boolean test of whether the database | |
| // is responding. It is important to choose a query that will return quickly or you risk | |
| // overloading the database. | |
| // | |
| // In most cases this is not necessary, but if you find it necessary, choose a simple query such as 'SELECT 1'. | |
| protected string TestQuery { get; } | |
| protected abstract DbConnection CreateConnection(string connectionString); | |
| public async Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default(CancellationToken)) | |
| { | |
| using (var connection = CreateConnection(ConnectionString)) | |
| { | |
| try | |
| { | |
| await connection.OpenAsync(cancellationToken); | |
| if (TestQuery != null) | |
| { | |
| var command = connection.CreateCommand(); | |
| command.CommandText = TestQuery; | |
| await command.ExecuteNonQueryAsync(cancellationToken); | |
| } | |
| } | |
| catch (DbException ex) | |
| { | |
| return new HealthCheckResult(status: context.Registration.FailureStatus, exception: ex); | |
| } | |
| } | |
| return HealthCheckResult.Healthy(); | |
| } | |
| } | |
| } |
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