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Establishe redis connection after its lost after a few minutes

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This commit is contained in:
Manuel Belsak 2016-11-30 13:59:21 +00:00
parent 7d759f04ed
commit 34fecbf1fd
1 changed files with 29 additions and 5 deletions
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34
worker/src/Worker/Program.cs
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@ -17,17 +17,41 @@ namespace Worker
try
{
var pgsql = OpenDbConnection("Server=db;Username=postgres;");
var redis = OpenRedisConnection("redis").GetDatabase();
var redisConn = OpenRedisConnection("redis");
var redis = redisConn.GetDatabase();
// Keep alive is not implemented in Npgsql yet. This workaround was recommended:
// https://github.com/npgsql/npgsql/issues/1214#issuecomment-235828359
var keepAliveCommand = pgsql.CreateCommand();
keepAliveCommand.CommandText = "SELECT 1";
var definition = new { vote = "", voter_id = "" };
while (true)
{
// Reconnect redis if down
if (redisConn == null || !redisConn.IsConnected) {
Console.WriteLine("Reconnecting Redis");
redis = OpenRedisConnection("redis").GetDatabase();
}
string json = redis.ListLeftPopAsync("votes").Result;
if (json != null)
{
var vote = JsonConvert.DeserializeAnonymousType(json, definition);
Console.WriteLine($"Processing vote for '{vote.vote}' by '{vote.voter_id}'");
UpdateVote(pgsql, vote.voter_id, vote.vote);
// Reconnect DB if down
if (!pgsql.State.Equals(System.Data.ConnectionState.Open))
{
Console.WriteLine("Reconnecting DB");
pgsql = OpenDbConnection("Server=db;Username=postgres;");
}
else
{ // Normal +1 vote requested
UpdateVote(pgsql, vote.voter_id, vote.vote);
}
}
else
{
keepAliveCommand.ExecuteNonQuery();
}
}
}
@ -66,7 +90,7 @@ namespace Worker
var command = connection.CreateCommand();
command.CommandText = @"CREATE TABLE IF NOT EXISTS votes (
id VARCHAR(255) NOT NULL UNIQUE,
id VARCHAR(255) NOT NULL UNIQUE,
vote VARCHAR(255) NOT NULL
)";
command.ExecuteNonQuery();
@ -84,7 +108,7 @@ namespace Worker
{
try
{
Console.Error.WriteLine("Connected to redis");
Console.Error.WriteLine("Connecting to redis");
return ConnectionMultiplexer.Connect(ipAddress);
}
catch (RedisConnectionException)
@ -123,4 +147,4 @@ namespace Worker
}
}
}
}
}