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Move relay arch into relayapi and add docs for new endpoints
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@ -10,7 +10,7 @@ Transactions include a list of PDUs, (which contain, among other things, lists o
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There is no additional information sent along with the transaction other than what is typically added to them during Matrix federation today.
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In the future this will probably need to change in order to handle more complex room state resolution during p2p usage.
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### Relay Server Architecture
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### Design
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```
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0 +--------------------+
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@ -57,3 +57,78 @@ But in order to achieve this, you are either relying on p2p presence broadcasts
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#### Recipient-Side Relay Servers
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If we have agreed to some static relay server before going off and doing other things, or if we are talking about more global p2p federation, then having a recipient designated relay server can cut down on redundant traffic since it will sit there idle until the recipient pulls events from it.
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### API
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Relay servers make use of 2 new matrix federation endpoints.
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These are:
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- PUT /_matrix/federation/v1/send_relay/{txnID}/{userID}
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- GET /_matrix/federation/v1/relay_txn/{userID}
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#### Send_Relay
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The `send_relay` endpoint is used to send events to a relay server that are destined for some other node. Servers can send events to this endpoint if they wish for the relay server to store & forward events for them when they go offline.
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##### Request
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###### Request Parameters
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| Name | Type | Description |
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|--------|--------|-----------------------------------------------------|
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| txnID | string | **Required:** The transaction ID. |
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| userID | string | **Required:** The destination for this transaciton. |
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###### Request Body
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| Name | Type | Description |
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|--------|--------|----------------------------------------|
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| pdus | [PDU] | **Required:** List of pdus. Max 50. |
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| edus | [EDU] | List of edus. May be omitted. Max 100. |
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##### Responses
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| Code | Reason |
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|--------|--------------------------------------------------|
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| 200 | Successfully stored transaction for forwarding. |
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| 400 | Invalid userID. |
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| 400 | Invalid request body. |
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| 400 | Too many pdus or edus. |
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| 500 | Server failed processing transaction. |
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#### Relay_Txn
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The `relay_txn` endpoint is used to get events from a relay server that are destined for you. Servers can send events to this endpoint if they wish for the relay server to store & forward events for them when they go offline.
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##### Request
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**This needs to be changed to prevent nodes from obtaining transactions not destined for them. Possibly by adding a signature field to the request.**
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###### Request Parameters
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| Name | Type | Description |
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|--------|--------|----------------------------------------------------------------|
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| userID | string | **Required:** The user ID that events are being requested for. |
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###### Request Body
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| Name | Type | Description |
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|----------|--------|----------------------------------------|
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| entry_id | int64 | **Required:** The id of the previous transaction received from the relay. Provided in the previous response to this endpoint. |
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##### Responses
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| Code | Reason |
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|--------|--------------------------------------------------|
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| 200 | Successfully stored transaction for forwarding. |
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| 400 | Invalid userID. |
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| 400 | Invalid request body. |
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| 400 | Invalid previous entry. Must be >= 0 |
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| 500 | Server failed processing transaction. |
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###### 200 Response Body
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| Name | Type | Description |
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|----------------|--------------|--------------------------------------------------------------------------|
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| transaction | Transaction | **Required:** A matrix transaction. |
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| entry_id | int64 | An ID associated with this transaction. |
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| entries_queued | bool | **Required:** Whether or not there are more events stored for this user. |
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