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update light push section

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Sasha 2024-07-08 00:13:12 +02:00
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informational/req-res-reliability.md
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@ -66,9 +66,21 @@ we need to be sure to keep connection information up to date in Peer Store.
### LightPush
- While sending message with Light Push - it is advised to use more than 1 peer in order to increase chances of delivering message.
#### Sending with redundancy
To improve chances of delivery of messages light node can attempt sending same message via LightPush to 2 or more service nodes at the same time.
While doing so it is important to note that bandwidth consumption increases.
- If sending message is failed to all of the peers - node should try to re-send message after some interval and continue doing so until OK response is received.
#### Retry on failure
When light node sends a message it must await for LightPush response from service node and check it for [possible error codes](../standards/core/lightpush.md#examples-of-possible-error-codes).
In case request failed without error code or response contains errors that can be temporary for service node (e.g `TOO_MANY_REQUESTS` or `NO_PEERS_TO_RELAY`) -
light node should try to re-send message after some interval and continue doing so until OK response is received or canceled.
Interval time can be arbitrary but we recommend starting with 1 second and increasing it on each failure during LightPush send.
Important to note that [per another recommendation](./req-res-reliability.md#pool-of-reliable-service-nodes) - light node should replace failing service node with another within pool of service nodes used by LightPush.
#### Retry missing messages
Light node can verity that network that is used at the moment has seen messages that were sent via LightPush earlier.
In order to do that light node should use [Store protocol](../standards/core/store.md).
By using Store light node can query service node that implements Store and see if the messages that were sent in the past period were seen.
### Filter