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connection.ex
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connection.ex
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defmodule Exq.Redis.Connection do
@moduledoc """
The Connection module encapsulates interaction with a live Redis connection or pool.
"""
require Logger
alias Exq.Support.Config
alias Exq.Support.Redis
def flushdb!(redis) do
{:ok, res} = q(redis, ["flushdb"])
res
end
def decr!(redis, key) do
{:ok, count} = q(redis, ["DECR", key])
count
end
def incr!(redis, key) do
{:ok, count} = q(redis, ["INCR", key])
count
end
def get!(redis, key) do
{:ok, val} = q(redis, ["GET", key])
val
end
def set!(redis, key, val \\ 0) do
q(redis, ["SET", key, val])
end
def del!(redis, key, options \\ []) do
q(redis, ["DEL", key], options)
end
def expire!(redis, key, time \\ 10) do
q(redis, ["EXPIRE", key, time])
end
def llen!(redis, list) do
{:ok, len} = q(redis, ["LLEN", list])
len
end
def keys!(redis, search \\ "*") do
{:ok, keys} = q(redis, ["KEYS", search])
keys
end
def scan!(redis, cursor, search, count) do
{:ok, keys} = q(redis, ["SCAN", cursor, "MATCH", search, "COUNT", count])
keys
end
def scard!(redis, set) do
{:ok, count} = q(redis, ["SCARD", set])
count
end
def smembers!(redis, set) do
{:ok, members} = q(redis, ["SMEMBERS", set])
members
end
def sadd!(redis, set, member) do
{:ok, res} = q(redis, ["SADD", set, member])
res
end
def srem!(redis, set, member) do
{:ok, res} = q(redis, ["SREM", set, member])
res
end
def sismember!(redis, set, member) do
{:ok, res} = q(redis, ["SISMEMBER", set, member])
res
end
def lrange!(redis, list, range_start \\ "0", range_end \\ "-1") do
{:ok, items} = q(redis, ["LRANGE", list, range_start, range_end])
items
end
def lrem!(redis, list, value, count \\ 1, options \\ []) do
{:ok, res} =
if is_list(value) do
commands = Enum.map(value, fn v -> ["LREM", list, count, v] end)
qp(redis, commands, options)
else
q(redis, ["LREM", list, count, value], options)
end
res
end
def rpush!(redis, key, value) do
{:ok, res} = q(redis, ["RPUSH", key, value])
res
end
def lpush!(redis, key, value) do
{:ok, res} = q(redis, ["LPUSH", key, value])
res
end
def lpop(redis, key) do
q(redis, ["LPOP", key])
end
def zadd(redis, set, score, member, options \\ []) do
q(redis, ["ZADD", set, score, member], options)
end
def zadd!(redis, set, score, member) do
{:ok, res} = q(redis, ["ZADD", set, score, member])
res
end
def zcard!(redis, set) do
{:ok, count} = q(redis, ["ZCARD", set])
count
end
def zcount!(redis, set, min \\ "-inf", max \\ "+inf") do
{:ok, count} = q(redis, ["ZCOUNT", set, min, max])
count
end
def zrangebyscore!(redis, set, min \\ "0", max \\ "+inf") do
{:ok, items} = q(redis, ["ZRANGEBYSCORE", set, min, max])
items
end
def zrangebyscorewithlimit!(redis, set, offset, size, min \\ "0", max \\ "+inf") do
{:ok, items} = q(redis, ["ZRANGEBYSCORE", set, min, max, "LIMIT", offset, size])
items
end
def zrangebyscore(redis, set, min \\ "0", max \\ "+inf") do
q(redis, ["ZRANGEBYSCORE", set, min, max])
end
def zrangebyscorewithscore!(redis, set, min \\ "0", max \\ "+inf") do
{:ok, items} = q(redis, ["ZRANGEBYSCORE", set, min, max, "WITHSCORES"])
items
end
def zrangebyscorewithscoreandlimit!(redis, set, offset, size, min \\ "0", max \\ "+inf") do
{:ok, items} = q(redis, ["ZRANGEBYSCORE", set, min, max, "WITHSCORES", "LIMIT", offset, size])
items
end
def zrangebyscorewithscore(redis, set, min \\ "0", max \\ "+inf") do
q(redis, ["ZRANGEBYSCORE", set, min, max, "WITHSCORES"])
end
def zrevrangebyscorewithlimit!(redis, set, offset, size, min \\ "0", max \\ "+inf") do
{:ok, items} = q(redis, ["ZREVRANGEBYSCORE", set, max, min, "LIMIT", offset, size])
items
end
def zrevrangebyscorewithscoreandlimit!(redis, set, offset, size, min \\ "0", max \\ "+inf") do
{:ok, items} =
q(redis, ["ZREVRANGEBYSCORE", set, max, min, "WITHSCORES", "LIMIT", offset, size])
items
end
def zrange!(redis, set, range_start \\ "0", range_end \\ "-1") do
{:ok, items} = q(redis, ["ZRANGE", set, range_start, range_end])
items
end
def zrem!(redis, set, members) when is_list(members) do
{:ok, res} = q(redis, ["ZREM", set | members])
res
end
def zrem!(redis, set, member) do
{:ok, res} = q(redis, ["ZREM", set, member])
res
end
def zrem(redis, set, member) do
q(redis, ["ZREM", set, member])
end
def q(redis, command, options \\ []) do
Redis.with_retry_on_connection_error(
fn ->
redis
|> Redix.command(command, timeout: Config.get(:redis_timeout))
|> handle_response(redis)
end,
Keyword.get(options, :retry_on_connection_error, 0)
)
end
def qp(redis, command, options \\ []) do
Redis.with_retry_on_connection_error(
fn ->
redis
|> Redix.pipeline(command, timeout: Config.get(:redis_timeout))
|> handle_responses(redis)
end,
Keyword.get(options, :retry_on_connection_error, 0)
)
end
def qp!(redis, command, options \\ []) do
Redis.with_retry_on_connection_error(
fn ->
redis
|> Redix.pipeline!(command, timeout: Config.get(:redis_timeout))
|> handle_responses(redis)
end,
Keyword.get(options, :retry_on_connection_error, 0)
)
end
defp handle_response({:error, %{message: "READONLY" <> _rest}} = error, redis) do
disconnect(redis)
error
end
defp handle_response({:error, %{message: "NOSCRIPT" <> _rest}} = error, _) do
error
end
defp handle_response({:error, %Redix.ConnectionError{reason: :disconnected}} = error, _) do
error
end
defp handle_response({:error, message} = error, _) do
Logger.error(inspect(message))
error
end
defp handle_response(response, _) do
response
end
defp handle_responses({:ok, responses} = result, redis) do
# Disconnect once for multiple readonly redis node errors.
if Enum.any?(responses, &readonly_error?/1) do
disconnect(redis)
end
result
end
defp handle_responses(responses, redis) when is_list(responses) do
# Disconnect once for multiple readonly redis node errors.
if Enum.any?(responses, &readonly_error?/1) do
disconnect(redis)
end
responses
end
defp handle_responses(responses, _) do
responses
end
defp readonly_error?(%{message: "READONLY" <> _rest}), do: true
defp readonly_error?(_), do: false
defp disconnect(redis) do
pid = Process.whereis(redis)
if !is_nil(pid) && Process.alive?(pid) do
# Let the supervisor restart the process with a new connection.
Logger.error("Redis failover - forcing a reconnect")
Process.exit(pid, :kill)
# Give the process some time to be restarted.
:timer.sleep(100)
end
end
end