nim-codex/codex/blockexchange/peers/peercontext.nim

## Nim-Codex
## Copyright (c) 2021 Status Research & Development GmbH
## Licensed under either of
##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.

import std/sequtils
import std/tables
import std/sets

import pkg/libp2p
import pkg/chronos
import pkg/nitro
import pkg/questionable

import ../protobuf/blockexc
import ../protobuf/payments
import ../protobuf/presence

import ../../blocktype
import ../../logutils

export payments, nitro

type
  BlockExcPeerCtx* = ref object of RootObj
    id*: PeerId
    blocks*: Table[BlockAddress, Presence]  # remote peer have list including price
    peerWants*: seq[WantListEntry]          # remote peers want lists
    exchanged*: int                         # times peer has exchanged with us
    lastExchange*: Moment                   # last time peer has exchanged with us
    account*: ?Account                      # ethereum account of this peer
    paymentChannel*: ?ChannelId             # payment channel id

proc peerHave*(self: BlockExcPeerCtx): seq[BlockAddress] =
  toSeq(self.blocks.keys)

proc peerHaveCids*(self: BlockExcPeerCtx): HashSet[Cid] =
  self.blocks.keys.toSeq.mapIt(it.cidOrTreeCid).toHashSet

proc peerWantsCids*(self: BlockExcPeerCtx): HashSet[Cid] =
  self.peerWants.mapIt(it.address.cidOrTreeCid).toHashSet

proc contains*(self: BlockExcPeerCtx, address: BlockAddress): bool =
  address in self.blocks

func setPresence*(self: BlockExcPeerCtx, presence: Presence) =
  self.blocks[presence.address] = presence

func cleanPresence*(self: BlockExcPeerCtx, addresses: seq[BlockAddress]) =
  for a in addresses:
    self.blocks.del(a)

func cleanPresence*(self: BlockExcPeerCtx, address: BlockAddress) =
  self.cleanPresence(@[address])

func price*(self: BlockExcPeerCtx, addresses: seq[BlockAddress]): UInt256 =
  var price = 0.u256
  for a in addresses:
    self.blocks.withValue(a, precense):
      price += precense[].price

  price