nwaku/waku/waku_store/rpc.nim

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when (NimMajor, NimMinor) < (1, 4):
{.push raises: [Defect].}
else:
{.push raises: [].}
import
std/[options, sequtils],
stew/results
import
../waku_core,
./common
## Wire protocol
type PagingIndexRPC* = object
## This type contains the description of an Index used in the pagination of WakuMessages
pubsubTopic*: PubsubTopic
senderTime*: Timestamp # the time at which the message is generated
receiverTime*: Timestamp
digest*: MessageDigest # calculated over payload and content topic
proc `==`*(x, y: PagingIndexRPC): bool =
## receiverTime plays no role in index equality
(x.senderTime == y.senderTime) and
(x.digest == y.digest) and
(x.pubsubTopic == y.pubsubTopic)
proc compute*(T: type PagingIndexRPC, msg: WakuMessage, receivedTime: Timestamp, pubsubTopic: PubsubTopic): T =
## Takes a WakuMessage with received timestamp and returns its Index.
let
digest = computeDigest(msg)
senderTime = msg.timestamp
PagingIndexRPC(
pubsubTopic: pubsubTopic,
senderTime: senderTime,
receiverTime: receivedTime,
digest: digest
)
type
PagingDirectionRPC* {.pure.} = enum
## PagingDirection determines the direction of pagination
BACKWARD = uint32(0)
FORWARD = uint32(1)
PagingInfoRPC* = object
## This type holds the information needed for the pagination
pageSize*: Option[uint64]
cursor*: Option[PagingIndexRPC]
direction*: Option[PagingDirectionRPC]
type
HistoryContentFilterRPC* = object
contentTopic*: ContentTopic
HistoryQueryRPC* = object
contentFilters*: seq[HistoryContentFilterRPC]
pubsubTopic*: Option[PubsubTopic]
pagingInfo*: Option[PagingInfoRPC]
startTime*: Option[int64]
endTime*: Option[int64]
HistoryResponseErrorRPC* {.pure.} = enum
## HistoryResponseErrorRPC contains error message to inform the querying node about
## the state of its request
NONE = uint32(0)
INVALID_CURSOR = uint32(1)
SERVICE_UNAVAILABLE = uint32(503)
HistoryResponseRPC* = object
messages*: seq[WakuMessage]
pagingInfo*: Option[PagingInfoRPC]
error*: HistoryResponseErrorRPC
HistoryRPC* = object
requestId*: string
query*: Option[HistoryQueryRPC]
response*: Option[HistoryResponseRPC]
proc parse*(T: type HistoryResponseErrorRPC, kind: uint32): T =
case kind:
of 0, 1, 503:
HistoryResponseErrorRPC(kind)
else:
# TODO: Improve error variants/move to satus codes
HistoryResponseErrorRPC.INVALID_CURSOR
## Wire protocol type mappings
proc toRPC*(cursor: HistoryCursor): PagingIndexRPC {.gcsafe.}=
PagingIndexRPC(
pubsubTopic: cursor.pubsubTopic,
senderTime: cursor.senderTime,
receiverTime: cursor.storeTime,
digest: cursor.digest
)
proc toAPI*(rpc: PagingIndexRPC): HistoryCursor =
HistoryCursor(
pubsubTopic: rpc.pubsubTopic,
senderTime: rpc.senderTime,
storeTime: rpc.receiverTime,
digest: rpc.digest
)
proc toRPC*(query: HistoryQuery): HistoryQueryRPC =
var rpc = HistoryQueryRPC()
rpc.contentFilters = query.contentTopics.mapIt(HistoryContentFilterRPC(contentTopic: it))
rpc.pubsubTopic = query.pubsubTopic
rpc.pagingInfo = block:
if query.cursor.isNone() and
query.pageSize == default(type query.pageSize) and
query.ascending == default(type query.ascending):
none(PagingInfoRPC)
else:
let
pageSize = some(query.pageSize)
cursor = query.cursor.map(toRPC)
direction = if query.ascending: some(PagingDirectionRPC.FORWARD)
else: some(PagingDirectionRPC.BACKWARD)
some(PagingInfoRPC(
pageSize: pageSize,
cursor: cursor,
direction: direction
))
rpc.startTime = query.startTime
rpc.endTime = query.endTime
rpc
proc toAPI*(rpc: HistoryQueryRPC): HistoryQuery =
let
pubsubTopic = rpc.pubsubTopic
contentTopics = rpc.contentFilters.mapIt(it.contentTopic)
cursor = if rpc.pagingInfo.isNone() or rpc.pagingInfo.get().cursor.isNone(): none(HistoryCursor)
else: rpc.pagingInfo.get().cursor.map(toAPI)
startTime = rpc.startTime
endTime = rpc.endTime
pageSize = if rpc.pagingInfo.isNone() or rpc.pagingInfo.get().pageSize.isNone(): 0'u64
else: rpc.pagingInfo.get().pageSize.get()
ascending = if rpc.pagingInfo.isNone() or rpc.pagingInfo.get().direction.isNone(): true
else: rpc.pagingInfo.get().direction.get() == PagingDirectionRPC.FORWARD
HistoryQuery(
pubsubTopic: pubsubTopic,
contentTopics: contentTopics,
cursor: cursor,
startTime: startTime,
endTime: endTime,
pageSize: pageSize,
ascending: ascending
)
proc toRPC*(err: HistoryError): HistoryResponseErrorRPC =
# TODO: Better error mappings/move to error codes
case err.kind:
of HistoryErrorKind.BAD_REQUEST:
# TODO: Respond aksi with the reason
HistoryResponseErrorRPC.INVALID_CURSOR
of HistoryErrorKind.SERVICE_UNAVAILABLE:
HistoryResponseErrorRPC.SERVICE_UNAVAILABLE
else:
HistoryResponseErrorRPC.INVALID_CURSOR
proc toAPI*(err: HistoryResponseErrorRPC): HistoryError =
# TODO: Better error mappings/move to error codes
case err:
of HistoryResponseErrorRPC.INVALID_CURSOR:
HistoryError(kind: HistoryErrorKind.BAD_REQUEST, cause: "invalid cursor")
of HistoryResponseErrorRPC.SERVICE_UNAVAILABLE:
HistoryError(kind: HistoryErrorKind.SERVICE_UNAVAILABLE)
else:
HistoryError(kind: HistoryErrorKind.UNKNOWN)
proc toRPC*(res: HistoryResult): HistoryResponseRPC =
if res.isErr():
let error = res.error.toRPC()
HistoryResponseRPC(error: error)
else:
let resp = res.get()
let
messages = resp.messages
pagingInfo = block:
if resp.cursor.isNone():
none(PagingInfoRPC)
else:
some(PagingInfoRPC(cursor: resp.cursor.map(toRPC)))
error = HistoryResponseErrorRPC.NONE
HistoryResponseRPC(
messages: messages,
pagingInfo: pagingInfo,
error: error
)
proc toAPI*(rpc: HistoryResponseRPC): HistoryResult =
if rpc.error != HistoryResponseErrorRPC.NONE:
err(rpc.error.toAPI())
else:
let
messages = rpc.messages
cursor = if rpc.pagingInfo.isNone(): none(HistoryCursor)
else: rpc.pagingInfo.get().cursor.map(toAPI)
ok(HistoryResponse(
messages: messages,
cursor: cursor
))