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PerfCounterMySqlStorage.cs
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PerfCounterMySqlStorage.cs
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using Perfon.Interfaces.Common;
using Perfon.Interfaces.PerfCounterStorage;
namespace Perfon.Storage.MySql
{
/// <summary>
/// Driver for store/restore performance counter values in MySql.
/// </summary>
public class PerfCounterMySqlStorage : IPerfomanceCountersStorage
{
private string DbConnectionString { get; set; }
private ConcurrentBag<string> counterNames = new ConcurrentBag<string>();
private bool databaseStructureChecked = false;
/// <summary>
/// Reports about errors and exceptions occured.
/// </summary>
public event EventHandler<IPerfonErrorEventArgs> OnError;
public PerfCounterMySqlStorage(string dbConnectionString)
{
DbConnectionString = dbConnectionString;
}
/// <summary>
/// Awaitable.
/// </summary>
/// <param name="counters"></param>
/// <returns></returns>
public async Task StorePerfCounters(IEnumerable<IPerfCounterInputData> counters, DateTime? nowArg = null, string appId = null)
{
try
{
var now = DateTime.Now;
if (nowArg.HasValue)
{
now = nowArg.Value;
}
List<short> counterId = new List<short>();
bool updateNames = false;
foreach (var counter in counters)
{
if (!counterNames.Contains(counter.Name))
{
updateNames = true;
break;
}
counterId.Add((short)(Tools.CalculateHash(counter.Name) % (ulong)short.MaxValue));
}
using (var conn = new MySqlConnection(DbConnectionString))
{
conn.Open();
if (updateNames)
{
counterId.Clear();
if (!databaseStructureChecked)
{
await CheckDbstructure(conn);
}
using (var cmd = new MySqlCommand())
{
cmd.Connection = conn;
foreach (var counter in counters)
{
short id = -1;
// Retrieve counters id
cmd.CommandText = @"SELECT Id FROM CounterNames WHERE Name='" + counter.Name + "'";
cmd.Parameters.Add("counterName", MySqlDbType.VarChar).Value = counter.Name;
using (var reader = cmd.ExecuteReader())
{
while (reader.Read())
{
id = reader.GetInt16(0);
}
}
cmd.Parameters.Clear();
if (id == -1)
{
id = (short)(Tools.CalculateHash(counter.Name) % (ulong)short.MaxValue);
cmd.CommandText = @"INSERT INTO CounterNames (Id,Name) VALUES (@id, @counterName)";
cmd.Parameters.Add("id", MySqlDbType.Int16).Value = id;
cmd.Parameters.Add("counterName", MySqlDbType.VarChar).Value = counter.Name;
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
}
counterId.Add(id);
counterNames.Add(counter.Name);
}
}
}
using (MySqlCommand cmd = new MySqlCommand())
{
StringBuilder sCommand = new StringBuilder("INSERT INTO PerfomanceCounterValues (AppId, CounterId, Timestamp, Value) VALUES ");
var sb = new StringBuilder();
int i = 0;
cmd.Parameters.Add("timestamp", MySqlDbType.DateTime).Value = now;
foreach (var counter in counters)
{
sb.Append("(").Append(0).Append(",").Append(counterId[i]).Append(",@timestamp").Append(", @value").Append(i).Append("),");
cmd.Parameters.Add("value" + i, MySqlDbType.Float).Value = counter.Value;
i++;
}
sCommand.Append(sb.ToString().TrimEnd(',')).Append(';');
cmd.CommandText = sCommand.ToString();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
await cmd.ExecuteNonQueryAsync();
}
//using (var cmd = new MySqlCommand())
//{
// cmd.Connection = conn;
// int i = 0;
// foreach (var counter in counters)
// {
// cmd.CommandText = @"INSERT INTO PerfomanceCounterValues (AppId, CounterId, Timestamp, Value) VALUES (0, @id, @timestamp, @value)";
// cmd.Parameters.Add("id", MySqlDbType.Int16).Value = counterId[i];
// cmd.Parameters.Add("timestamp", MySqlDbType.DateTime).Value = now;
// cmd.Parameters.Add("value", MySqlDbType.Float).Value = counter.Value;
// await cmd.ExecuteNonQueryAsync();
// cmd.Parameters.Clear();
// i++;
// }
//}
}
}
catch (Exception exc)
{
if (OnError != null)
{
OnError(new object(), new PerfonErrorEventArgs(exc.ToString()));
}
}
return;
}
public async Task<IEnumerable<IPerfCounterValue>> QueryCounterValues(string counterName, DateTime? date = null, int skip = 0, string appId = null)
{
var list = new List<IPerfCounterValue>();
if (!date.HasValue)
{
date = DateTime.Now;
}
date = date.Value.Date;
try
{
using (var conn = new MySqlConnection(DbConnectionString))
{
conn.Open();
if (!databaseStructureChecked)
{
await CheckDbstructure(conn);
}
using (var cmd = new MySqlCommand())
{
cmd.Connection = conn;
var id = (short)(Tools.CalculateHash(counterName) % (ulong)short.MaxValue);
cmd.CommandText = @"SELECT Timestamp,Value FROM PerfomanceCounterValues
WHERE AppId=0 AND CounterId=@id AND Timestamp >= @timestamp AND Timestamp < @timestampNextDay ORDER BY Timestamp LIMIT 18446744073709551615 OFFSET @skip";
cmd.Parameters.Add("id", MySqlDbType.Int16).Value = id;
cmd.Parameters.Add("timestamp", MySqlDbType.DateTime).Value = date;
cmd.Parameters.Add("timestampNextDay", MySqlDbType.DateTime).Value = date.Value.AddDays(1); //CAST(Timestamp AS DATE) = @timestamp
cmd.Parameters.Add("skip", MySqlDbType.Int16).Value = skip;
using (var reader = await cmd.ExecuteReaderAsync(CommandBehavior.SequentialAccess))
{
while (await reader.ReadAsync())
{
var timeStamp = new DateTime(reader.GetDateTime(0).Ticks);
var value = reader.GetFloat(1);
list.Add(new PerfCounterValue(timeStamp, value));
}
}
}
}
}
catch (Exception exc)
{
if (OnError != null)
{
OnError(new object(), new PerfonErrorEventArgs(exc.ToString()));
}
}
return list as IEnumerable<IPerfCounterValue>;
}
public async Task<IEnumerable<string>> GetCountersList()
{
var res = new List<string>();
try
{
using (var conn = new MySqlConnection(DbConnectionString))
{
conn.Open();
if (!databaseStructureChecked)
{
await CheckDbstructure(conn);
}
using (var cmd = new MySqlCommand())
{
cmd.Connection = conn;
cmd.CommandText = @"SELECT Name FROM CounterNames ";
using (var reader = await cmd.ExecuteReaderAsync())
{
while (await reader.ReadAsync())
{
res.Add(reader.GetString(0));
}
}
}
}
}
catch (Exception exc)
{
if (OnError != null)
{
OnError(new object(), new PerfonErrorEventArgs(exc.ToString()));
}
}
return res as IEnumerable<string>;
}
private string sqlStructureText = "";
private async Task CheckDbstructure(MySqlConnection conn)
{
if (string.IsNullOrEmpty(sqlStructureText))
{
var assembly = Assembly.GetExecutingAssembly();
var resourceName = "Perfon.Storage.MySql.db_structure.sql";
try
{
using (Stream stream = assembly.GetManifestResourceStream(resourceName))
{
using (StreamReader reader = new StreamReader(stream))
{
sqlStructureText = reader.ReadToEnd();
}
}
}
catch (Exception exc)
{
if (OnError != null)
{
OnError(this, new PerfonErrorEventArgs(exc.ToString()));
}
}
}
using (var cmd = new MySqlCommand())
{
cmd.Connection = conn;
cmd.CommandText = sqlStructureText;
await cmd.ExecuteNonQueryAsync();
}
databaseStructureChecked = true;
}
}
}