Ruby TCP server - ERROR:PG::ConnectionBad: FATAL: remaining connection slots are reserved for non-replication superuser connections

Question

我已经编写了一个从终端设备接收数据包的 tcp 服务器。 TCP服务器解释数据并使用postgres将其保存在数据库中。

tcp 服务器是多线程的。我打开数据库连接并保存数据时的代码示例如下所示；

conn = Sequel.connect('postgres://xxxxx:xxxxxxxxxx@127.0.0.1:xxxxx/xxxxxxxxx',:max_connections => 100) # requires pg
transactions = conn.from(:transactions)
if transactions.insert(serial_number: card_serial, balance_before: balance_before, amount: transaction_amount, balance_after: balance_after, transaction_time: time, terminal_number: terminal_number, terminal_type: terminal_type, created_at: Time.now, updated_at: Time.now)
  response = {message: "TT01000080", status: "SUCCESS" }
  return response
else
  response = {message: "", status: "FAILED" }
  return response
end

几个数据包后，数据库会产生这样的错误； ERROR:PG::ConnectionBad: FATAL: remaining connection slots are reserved for non-replication superuser connections

即使添加行 conn.disconnect 也无助于解决问题。

Answer 1

每次要创建记录时都连接到数据库的想法并不是最好的方法。考虑将其更改为一些连接池。

但是如果你还想每次都连接，尝试使用block形式的connect，这样可以保证block结束后连接关闭。

你的代码中也没有close/disconnect，也许你把它放在return调用之后（这意味着它没有被执行）

尝试这样的事情：

response = nil
Sequel.connect('postgres://xxxxx:xxxxxxxxxx@127.0.0.1:xxxxx/xxxxxxxxx',:max_connections => 100) do |conn| # requires pg
  transactions = conn.from(:transactions)
  if transactions.insert(serial_number: card_serial, balance_before: balance_before, amount: transaction_amount, balance_after: balance_after, transaction_time: time, terminal_number: terminal_number, terminal_type: terminal_type, created_at: Time.now, updated_at: Time.now)
    response = {message: "TT01000080", status: "SUCCESS" }
  else
    response = {message: "", status: "FAILED" }
  end
end
return response

Ruby TCP server - ERROR:PG::ConnectionBad: FATAL: remaining connection slots are reserved for non-replication superuser connections

Ruby TCP server - ERROR:PG::ConnectionBad: FATAL: remaining connection slots are reserved for non-replication superuser connections

ruby

sockets

postgresql

tcp

sequel