Module eredis_sub

Data Types

channel()

channel() = binary()

eredis_queue()

eredis_queue() = queue:queue()

sub_args()

sub_args() = [sub_option()]

sub_option()

sub_option() = eredis:option() | {max_queue_size, non_neg_integer() | infinity} | {queue_behaviour, drop | exit}

Function Index

ack_message/1acknowledge the receipt of a pubsub message.
channels/1Returns the channels the given client is currently subscribing to.
controlling_process/1Make the calling process the controlling process.
controlling_process/2Make the given process (pid) the controlling process.
controlling_process/3Make the given process (pid) the controlling process subscriber with the given Timeout.
psubscribe/2Pattern subscribe to the given channels.
punsubscribe/2
start_link/0
start_link/1Callback for starting from poolboy.
start_link/3
start_link/4
start_link/6
start_link/7
stop/1
subscribe/2Subscribe to the given channels.
unsubscribe/2

Function Details

ack_message/1

ack_message(Client::pid()) -> ok

acknowledge the receipt of a pubsub message. each pubsub message must be acknowledged before the next one is received

channels/1

channels(Client) -> any()

Returns the channels the given client is currently subscribing to. Note: this list is based on the channels at startup and any channel added during runtime. It might not immediately reflect the channels Redis thinks the client is subscribed to.

controlling_process/1

controlling_process(Client::pid()) -> ok

Make the calling process the controlling process. The controlling process received pubsub-related messages, of which there are three kinds. In each message, the pid refers to the eredis client process.

{message, Channel::binary(), Message::binary(), pid()} This is sent for each pubsub message received by the client.

{pmessage, Pattern::binary(), Channel::binary(), Message::binary(), pid()} This is sent for each pattern pubsub message received by the client.

{dropped, NumMessages::integer(), pid()} If the queue reaches the max size as specified in start_link and the behaviour is to drop messages, this message is sent when the queue is flushed.

{subscribed, Channel::binary(), pid()} When using eredis_sub:subscribe(pid()), this message will be sent for each channel Redis aknowledges the subscription. The opposite, 'unsubscribed' is sent when Redis aknowledges removal of a subscription.

{eredis_disconnected, pid()} This is sent when the eredis client is disconnected from redis.

{eredis_connected, pid()} This is sent when the eredis client reconnects to redis after an existing connection was disconnected.

Any message of the form {message, _, _, _} must be acknowledged before any subsequent message of the same form is sent. This prevents the controlling process from being overrun with redis pubsub messages. See ack_message/1.

controlling_process/2

controlling_process(Client::pid(), Pid::pid()) -> ok

Make the given process (pid) the controlling process.

controlling_process/3

controlling_process(Client, Pid, Timeout) -> any()

Make the given process (pid) the controlling process subscriber with the given Timeout.

psubscribe/2

psubscribe(Client::pid(), Channels::[channel()]) -> ok

Pattern subscribe to the given channels. Returns immediately. The result will be delivered to the controlling process as any other message. Delivers {subscribed, Channel::binary(), pid()}

punsubscribe/2

punsubscribe(Client, Channels) -> any()

start_link/0

start_link() -> any()

start_link/1

start_link(Args::sub_args()) -> {ok, Pid::pid()} | {error, Reason::term()}

Callback for starting from poolboy

start_link/3

start_link(Host, Port, Password) -> any()

start_link/4

start_link(Transport, Host, Port, Password) -> any()

start_link/6

start_link(Host, Port, Password, ReconnectSleep, MaxQueueSize, QueueBehaviour) -> any()

start_link/7

start_link(Transport, Host, Port, Password, ReconnectSleep, MaxQueueSize, QueueBehaviour) -> any()

stop/1

stop(Pid) -> any()

subscribe/2

subscribe(Client::pid(), Channels::[channel()]) -> ok

Subscribe to the given channels. Returns immediately. The result will be delivered to the controlling process as any other message. Delivers {subscribed, Channel::binary(), pid()}

unsubscribe/2

unsubscribe(Client, Channels) -> any()


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