:: protocol-version: current version of the ames wire protocol :: =/ protocol-version=?(%0 %1 %2 %3 %4 %5 %6 %7) %0 :: |% +| %generics :: $mk-item: constructor for +ordered-map item type :: +* mk-item [key val] [key=key val=val] :: +ordered-map: treap with user-specified horizontal order :: :: Conceptually smaller items go on the left, so the item with the :: smallest key can be popped off the head. If $key is `@` and :: .compare is +lte, then the numerically smallest item is the head. :: ++ ordered-map |* [key=mold val=mold] => |% +$ item (mk-item key val) -- :: +compare: item comparator for horizontal order :: |= compare=$-([key key] ?) |% :: +check-balance: verify horizontal and vertical orderings :: ++ check-balance =| [l=(unit key) r=(unit key)] |= a=(tree item) ^- ? :: empty tree is valid :: ?~ a %.y :: nonempty trees must maintain several criteria :: ?& :: if .n.a is left of .u.l, assert horizontal comparator :: ?~(l %.y (compare key.n.a u.l)) :: if .n.a is right of .u.r, assert horizontal comparator :: ?~(r %.y (compare u.r key.n.a)) :: if .a is not leftmost element, assert vertical order between :: .l.a and .n.a and recurse to the left with .n.a as right :: neighbor :: ?~(l.a %.y &((mor key.n.a key.n.l.a) $(a l.a, l `key.n.a))) :: if .a is not rightmost element, assert vertical order :: between .r.a and .n.a and recurse to the right with .n.a as :: left neighbor :: ?~(r.a %.y &((mor key.n.a key.n.r.a) $(a r.a, r `key.n.a))) == :: +put: ordered item insert :: ++ put |= [a=(tree item) =key =val] ^- (tree item) :: base case: replace null with single-item tree :: ?~ a [n=[key val] l=~ r=~] :: base case: overwrite existing .key with new .val :: ?: =(key.n.a key) a(val.n val) :: if item goes on left, recurse left then rebalance vertical order :: ?: (compare key key.n.a) =/ l $(a l.a) ?> ?=(^ l) ?: (mor key.n.a key.n.l) a(l l) l(r a(l r.l)) :: item goes on right; recurse right then rebalance vertical order :: =/ r $(a r.a) ?> ?=(^ r) ?: (mor key.n.a key.n.r) a(r r) r(l a(r l.r)) :: +peek: produce head (smallest item) or null :: ++ peek |= a=(tree item) ^- (unit item) :: ?~ a ~ ?~ l.a `n.a $(a l.a) :: +pop: produce .head (smallest item) and .rest or crash if empty :: ++ pop |= a=(tree item) ^- [head=item rest=(tree item)] :: ?~ a !! ?~ l.a [n.a r.a] :: =/ l $(a l.a) :- head.l :: load .rest.l back into .a and rebalance :: ?: |(?=(~ rest.l) (mor key.n.a key.n.rest.l)) a(l rest.l) rest.l(r a(r r.rest.l)) :: +nip: remove root; for internal use :: ++ nip |= a=(tree item) ^- (tree item) :: ?> ?=(^ a) :: delete .n.a; merge and balance .l.a and .r.a :: |- ^- (tree item) ?~ l.a r.a ?~ r.a l.a ?: (mor key.n.l.a key.n.r.a) l.a(r $(l.a r.l.a)) r.a(l $(r.a l.r.a)) :: +traverse: stateful partial inorder traversal :: :: Mutates .state on each run of .f. Starts at .start key, or if :: .start is ~, starts at the head (item with smallest key). Stops :: when .f produces .stop=%.y. Traverses from smaller to larger :: keys. Each run of .f can replace an item's value or delete the :: item. :: ++ traverse |* state=mold |= $: a=(tree item) start=(unit key) =state f=$-([state item] [(unit val) ? state]) == ^+ [state a] :: acc: accumulator :: :: .stop: set to %.y by .f when done traversing :: .state: threaded through each run of .f and produced by +abet :: =/ acc [stop=`?`%.n state=state] =< abet =< main |% ++ abet [state.acc a] :: +main: main recursive loop; performs a partial inorder traversal :: ++ main ^+ . :: stop if empty or we've been told to stop :: ?~ a . ?: stop.acc . :: if nonempty .start, while we're left of .start, move right :: ?: &(?=(^ start) !(compare u.start key.n.a)) right :: inorder traversal: left -> node -> right, until .f sets .stop :: => left ?: stop.acc . => node ?: stop.acc . right :: +node: run .f on .n.a, updating .a, .state, and .stop :: ++ node ^+ . :: run .f on node, updating .stop.acc and .state.acc :: =^ res acc ?> ?=(^ a) (f state.acc n.a) :: apply update to .a from .f's product :: =. a :: if .f requested node deletion, merge and balance .l.a and .r.a :: ?~ res (nip a) :: we kept the node; replace its .val; order is unchanged :: ?> ?=(^ a) a(val.n u.res) :: ..node :: +left: recurse on the left subtree, copying mutant back into .a :: ++ left ^+ . ?~ a . =/ lef main(a l.a) lef(a a(l a.lef)) :: +right: recurse on the right subtree, copying mutant back into .a :: ++ right ^+ . ?~ a . =/ rig main(a r.a) rig(a a(r a.rig)) -- :: +tap: convert to list, smallest to largest :: ++ tap |= a=(tree item) ^- (list item) :: =| b=(list item) |- ^+ b ?~ a b :: $(a l.a, b [n.a $(a r.a)]) :: +gas: put a list of items :: ++ gas |= [a=(tree item) b=(list item)] ^- (tree item) :: ?~ b a $(b t.b, a (put a i.b)) :: +uni: unify two ordered maps :: :: TODO: document a/b precedence or disjointness constraint :: ++ uni |= [a=(tree item) b=(tree item)] ^- (tree item) :: ?~ b a ?~ a b ?: (mor key.n.a key.n.b) :: ?: =(key.n.b key.n.a) [n.b $(a l.a, b l.b) $(a r.a, b r.b)] :: ?: (compare key.n.b key.n.a) $(l.a $(a l.a, r.b ~), b r.b) $(r.a $(a r.a, l.b ~), b l.b) :: ?: =(key.n.a key.n.b) [n.b $(b l.b, a l.a) $(b r.b, a r.a)] :: ?: (compare key.n.a key.n.b) $(l.b $(b l.b, r.a ~), a r.a) $(r.b $(b r.b, l.a ~), a l.a) -- :: +| %atomics :: +$ blob @uxblob +$ bone @udbone +$ fragment @uwfragment +$ fragment-num @udfragmentnum +$ lane @uxlane +$ message-num @udmessagenum +$ public-key @uwpublickey +$ signature @uwsignature +$ symmetric-key @uwsymmetrickey :: $rank: which kind of ship address, by length :: :: 0: galaxy or star -- 2 bytes :: 1: planet -- 4 bytes :: 2: moon -- 8 bytes :: 3: comet -- 16 bytes :: +$ rank ?(%0 %1 %2 %3) :: +| %kinetics :: :: $channel: combined sender and receiver identifying data :: +$ channel $: [our=ship her=ship] now=@da :: our data, common to all dyads :: $: =our=life crypto-core=acru:ames == :: her data, specific to this dyad :: $: =symmetric-key =her=life =her=public-key her-sponsors=(list ship) == == :: $dyad: pair of sender and receiver ships :: +$ dyad [sndr=ship rcvr=ship] :: +$ error [tag=@tas =tang] :: $message: application-level message :: :: path: internal route on the receiving ship :: payload: semantic message contents :: +$ message [=path payload=*] :: $packet: noun representation of an ames datagram packet :: :: Roundtrips losslessly through atom encoding and decoding. :: :: .origin is ~ unless the packet is being forwarded. If present, :: it's an atom that encodes a route to another ship, such as an IPv4 :: address. Routes are opaque to Arvo and only have meaning in the :: interpreter. This enforces that Ames is transport-agnostic. :: +$ packet [dyad encrypted=? origin=(unit lane) content=*] :: $open-packet: unencrypted packet payload, for comet self-attestation :: +$ open-packet $: =signature =sndr=life =rcvr=life rcvr=ship == :: $shut-packet: encrypted packet payload :: +$ shut-packet $: =sndr=life =rcvr=life =bone =message-num meat=(each fragment-meat ack-meat) == :: $fragment-meat: contents of a message-fragment packet :: +$ fragment-meat $: num-fragments=fragment-num =fragment-num =fragment == :: $ack-meat: contents of an acknowledgment packet; fragment or message :: :: Fragment acks reference the $fragment-num of the target packet. :: :: Message acks contain a success flag .ok, which is %.n in case of :: negative acknowledgment (nack), along with .lag that describes the :: time it took to process the message. .lag is zero if the message :: was processed during a single Arvo event. At the moment, .lag is :: always zero. :: +$ ack-meat (each fragment-num [ok=? lag=@dr]) :: +| %statics :: :: $ames-state: state for entire vane :: +$ ames-state $: peers=(map ship ship-state) =unix=duct =life crypto-core=acru:ames == :: $ship-state: all we know about a peer :: :: %alien: no PKI data, so enqueue actions to perform once we learn it :: %known: we know their life and public keys, so we have a channel :: +$ ship-state $% [%alien pending-requests] [%known peer-state] == :: $pending-requests: what to do when we learn a peer's life and keys :: :: rcv-packets: packets we've received from unix :: snd-messages: messages local vanes have asked us to send :: +$ pending-requests $: rcv-packets=(list [=lane =packet]) snd-messages=(list [=duct =message]) == :: $peer-state: state for a peer with known life and keys :: :: route: transport-layer destination for packets to peer :: ossuary: bone<->duct mapper :: snd: per-bone message pumps to send messages as fragments :: rcv: per-bone message stills to assemble messages from fragments :: nax: unprocessed nacks (negative acknowledgments) :: Each value is ~ when we've received the ack packet but not a :: naxplanation, or an error when we've received a naxplanation :: but not the ack packet. :: :: When we hear a nack packet or an explanation, if there's no :: entry in .nax, we make a new entry. Otherwise, if this new :: information completes the packet+naxplanation, we remove the :: entry and emit a nack to the local vane that asked us to send :: the message. :: :: TODO: should .route be a unit, or do we always need a lane? :: +$ peer-state $: $: =symmetric-key =life =public-key sponsors=(list ship) == route=(unit [direct=? =lane]) =ossuary snd=(map bone message-pump-state) rcv=(map bone message-still-state) nax=(map [=bone =message-num] (unit error)) == :: $ossuary: bone<->duct bijection and .next-bone to map to a duct :: +$ ossuary $: =next=bone by-duct=(map duct bone) by-bone=(map bone duct) == :: $message-pump-state: persistent state for |message-pump :: :: Messages queue up in |message-pump's .unsent-messages until they :: can be packetized and fed into |packet-pump for sending. When we :: pop a message off .unsent-messages, we push as many fragments as :: we can into |packet-pump, then place the remaining in :: .unsent-fragments. :: :: When we hear a packet ack, we send it to |packet-pump. If we :: haven't seen it before, |packet-pump reports the fresh ack. :: :: When we hear a message ack (positive or negative), we treat that :: as though all fragments have been acked. If this message is not :: .current, then it's a future message and .current has not yet been :: acked, so we place the message in .queued-message-acks. :: :: If we hear a message ack before we've sent all the :: fragments for that message, clear .unsent-fragments. If the :: message ack was positive, print it out because it indicates the :: peer is not behaving properly. :: :: If the ack is for the current message, emit the message ack, :: increment .current, and check if this next message is in :: .queued-message-acks. If it is, emit the message (n)ack, :: increment .current, and check the next message. Repeat until :: .current is not fully acked. :: :: When we hear a message nack, we send it to |packet-pump, which :: deletes all packets from that message. If .current gets nacked, :: clear .unsent-fragments and go into the same flow as when we hear :: the last packet ack on a message. :: :: The following equation is always true: :: .next - .current == number of messages in flight :: :: At the end of a task, |message-pump sends a %finalize task to :: |packet-pump, which can trigger a timer to be set or cleared based :: on congestion control calculations. When it fires, the timer will :: generally cause one or more packets to be resent. :: :: current: sequence number of message being sent :: next: sequence number of next message to send :: unsent-messages: messages to be sent after current message :: unsent-fragments: fragments of current message waiting for sending :: queued-message-acks: future message acks to be applied after current :: packet-pump-state: state of corresponding |packet-pump :: +$ message-pump-state $: current=message-num next=message-num unsent-messages=(qeu message) unsent-fragments=(list static-fragment) queued-message-acks=(map message-num ok=?) =packet-pump-state == :: $packet-pump-state: persistent state for |packet-pump :: :: next-wake: last timer we've set, or null :: live: packets in flight; sent but not yet acked :: lost: packets to retry, since they timed out with no ack :: metrics: congestion control information :: +$ packet-pump-state $: next-wake=(unit @da) live=(tree [live-packet-key live-packet-val]) metrics=pump-metrics == :: $pump-metrics: congestion control statistics for the |pump-gauge :: :: num-live: number of sent packets in flight :: num-lost: number of expired packets :: last-sent-at: last date at which we sent a packet :: last-dead-at: most recently packet expiry :: rtt: roundtrip time estimate :: max-live: current window size :: +$ pump-metrics $: num-live=@ud num-lost=@ud last-sent-at=@da last-dead-at=@da rtt=@dr max-live=_7 == +$ live-packet-key [=message-num =fragment-num] +$ live-packet-val $: sent-packet-state num-fragments=fragment-num =fragment == +$ sent-packet-state $: expiry=@da sent-date=@da retried=? == +$ static-fragment $: =message-num num-fragments=fragment-num =fragment-num =fragment == :: $message-still-state: state of |message-still to assemble messages :: :: last-acked: highest $message-num we've fully acknowledged :: last-heard: highest $message-num we've heard all fragments on :: pending-vane-ack: heard but not processed by local vane :: live-messages: partially received messages :: +$ message-still-state $: last-acked=message-num last-heard=message-num pending-vane-ack=(qeu [=message-num =message]) live-messages=(map message-num partial-rcv-message) == :: $partial-rcv-message: message for which we've received some fragments :: :: num-fragments: total number of fragments in this message :: num-received: how many fragments we've received so far :: fragments: fragments we've received, eventually producing a $message :: +$ partial-rcv-message $: num-fragments=fragment-num num-received=fragment-num fragments=(map fragment-num fragment) == :: +| %dialectics :: :: $move: output effect; either request or response :: +$ move [=duct card=(wind note gift)] :: :: $task: job for ames :: :: %born: process restart notification :: %crud: crash report :: %hear: packet from unix :: %hole: report that packet handling crashed :: %init: vane boot :: %sunk: a ship breached and has a new .rift :: %vega: kernel reload notification :: %wegh: request for memory usage report :: %west: request to send message :: +$ task $% [%born ~] [%crud =error] [%hear =lane =blob] [%hole =lane =blob] [%init =ship] [%sunk =ship =rift] [%vega ~] [%wegh ~] [%west =ship =message] == :: $gift: effect from ames :: :: %east: message to vane from peer :: %send: packet to unix :: %rest: notify vane that peer (n)acked our message :: +$ gift $% [%east payload=*] [%send =lane =blob] [%rest error=(unit error)] == :: $note: request to other vane :: :: TODO: specialize gall interface for subscription management :: +$ note $% $: %b $% [%wait date=@da] [%rest date=@da] == == $: %c $% [%west =ship =message] == == $: %g $% [%west =ship =message] == == $: %j $% [%pubs =ship] [%turf ~] [%west =ship =message] [%vein ~] == == == :: $sign: response from other vane :: +$ sign $% $: %b $% [%wake error=(unit tang)] == == $: %j $% [%pubs public:able:jael] [%turf turf=(list turf)] [%vein =life vein=(map life ring)] == == == :: $message-pump-task: job for |message-pump :: :: %send: packetize and send application-level message :: %hear-fragment-ack: deal with a packet acknowledgment :: %hear-message-ack: deal with message negative acknowledgment :: %wake: handle timer firing :: +$ message-pump-task $% [%send =message] [%hear-fragment-ack =message-num =fragment-num] [%hear-message-ack =message-num ok=? lag=@dr] [%wake ~] == :: $message-pump-gift: effect from |message-pump :: :: %ack-message: report message acknowledgment :: %send: emit message fragment :: %wait: set a new timer at .date :: %rest: cancel timer at .date :: +$ message-pump-gift $% [%ack-message =message-num ok=?] [%send =static-fragment] [%wait date=@da] [%rest date=@da] == :: $packet-pump-task: job for |packet-pump :: :: %hear-fragment-ack: deal with a packet acknowledgment :: %hear-message-ack: deal with message acknowledgment :: %finalize: finish event, possibly updating timer :: %wake: handle timer firing :: +$ packet-pump-task $% [%hear-fragment-ack =message-num =fragment-num] [%hear-message-ack =message-num lag=@dr] [%finalize ~] [%wake ~] == :: $packet-pump-gift: effect from |packet-pump :: :: %send: emit message fragment :: %wait: set a new timer at .date :: %rest: cancel timer at .date :: +$ packet-pump-gift $% [%send =static-fragment] [%wait date=@da] [%rest date=@da] == :: $message-still-task: job for |message-still :: :: %hear: handle receiving a message fragment packet :: %done: receive confirmation from vane of processing completion or :: failure with diagnostic :: +$ message-still-task $% [%hear =lane =shut-packet] [%done =message-num error=(unit error)] == :: $message-still-gift: effect from |message-still :: :: %hear-message: $message assembled from received packets, to be :: sent to a local vane for processing :: %send-ack: emit an ack packet :: +$ message-still-gift $% [%hear-message =message] [%send-ack =message-num =ack-meat] == -- :: external vane interface :: =< |= pit=vase =| =ames-state |= [our=ship eny=@ now=@da scry-gate=sley] =* ames-gate . |% :: +call: handle request $task :: ++ call |= [=duct type=* wrapped-task=(hobo task)] ^- [(list move) _ames-gate] :: =/ =task ?. ?=(%soft -.wrapped-task) wrapped-task ;;(task p.wrapped-task) :: =/ event-core (per-event [our eny now scry-gate] duct ames-state) :: =^ moves ames-state =< abet ?- -.task %born !! %crud !! %hear (on-hear:event-core [lane blob]:task) %hole !! %init !! %sunk !! %vega !! %wegh !! %west (on-west:event-core [ship message]:task) == :: [moves ames-gate] :: +take: handle response $sign :: ++ take |= [=wire =duct type=* =sign] ^- [(list move) _ames-gate] :: !! :: +stay: extract state before reload :: ++ stay ames-state :: +load: load in old state after reload :: ++ load |= old=^ames-state ames-gate(ames-state old) :: +scry: dereference namespace :: ++ scry |= [fur=(unit (set monk)) ren=@tas why=shop syd=desk lot=coin tyl=path] ^- (unit (unit cage)) :: [~ ~] -- :: helpers :: |% ++ per-event =| moves=(list move) |= [[our=ship eny=@ now=@da scry-gate=sley] =duct =ames-state] |% ++ event-core . ++ abet [(flop moves) ames-state] ++ emit |=(=move event-core(moves [move moves])) :: :: ++ on-hear |= [=lane =blob] ^+ event-core :: =/ =packet (decode-packet blob) :: %. [lane packet] :: ?. =(our rcvr.packet) on-hear-forward :: ?: encrypted.packet on-hear-shut on-hear-open :: :: ++ on-hear-forward |= [=lane =packet] ^+ event-core :: !! :: :: ++ on-hear-open |= [=lane =packet] ^+ event-core :: !! :: :: ++ on-hear-shut |= [=lane =packet] ^+ event-core :: encrypted packet content must be an encrypted atom :: ?> ?=(@ content.packet) :: =/ sndr-state (~(get by peers.ames-state) sndr.packet) :: if we don't know them, enqueue the packet to be handled later :: ?. ?=([~ %known *] sndr-state) (enqueue-alien-packet lane packet) :: decrypt packet contents using symmetric-key.channel :: :: If we know them, we have a $channel with them, which we've :: populated with a .symmetric-key derived from our private key :: and their public key using elliptic curve Diffie-Hellman. :: =/ =peer-state +.u.sndr-state =/ =channel [[our sndr.packet] now +>.ames-state -.peer-state] =/ =shut-packet (decrypt symmetric-key.channel content.packet) :: ward against replay attacks :: :: We only accept packets from a ship at their known life, and to :: us at our current life. :: ?> =(sndr-life.shut-packet her-life.channel) ?> =(rcvr-life.shut-packet our-life.channel) :: abet:(on-hear-packet:(make-peer-core peer-state channel) lane shut-packet) :: +enqueue-alien-packet: store packet from untrusted source :: :: Also requests key and life from Jael on first contact. :: ++ enqueue-alien-packet |= [=lane =packet] ^+ event-core :: =/ sndr-state (~(get by peers.ames-state) sndr.packet) :: create a default $pending-requests on first contact :: =+ ^- [already-pending=? todos=pending-requests] ?~ sndr-state [%.n *pending-requests] [%.y ?>(?=(%alien -.u.sndr-state) +.u.sndr-state)] :: enqueue unprocessed packet and apply to permanent state :: =. rcv-packets.todos [[lane packet] rcv-packets.todos] :: =. peers.ames-state (~(put by peers.ames-state) sndr.packet %alien todos) :: ask jael for .sndr life and keys on first contact :: =? event-core !already-pending (emit duct %pass /alien %j %pubs sndr.packet) :: event-core :: +enqueue-alien-message: store message to untrusted source :: :: Also requests key and life from Jael on first contact. :: ++ enqueue-alien-message |= [=ship =message] ^+ event-core :: =/ rcvr-state (~(get by peers.ames-state) ship) :: create a default $pending-requests on first contact :: =+ ^- [already-pending=? todos=pending-requests] ?~ rcvr-state [%.n *pending-requests] [%.y ?>(?=(%alien -.u.rcvr-state) +.u.rcvr-state)] :: enqueue unsent message and apply to permanent state :: =. snd-messages.todos [[duct message] snd-messages.todos] :: =. peers.ames-state (~(put by peers.ames-state) ship %alien todos) :: ask jael for .ship life and keys on first contact :: =? event-core !already-pending (emit duct %pass /alien %j %pubs ship) :: event-core :: +on-west: handle request to send message :: ++ on-west |= [=ship =message] ^+ event-core :: =/ rcvr-state (~(get by peers.ames-state) ship) :: ?. ?=([~ %known *] rcvr-state) (enqueue-alien-message ship message) :: =/ =peer-state +.u.rcvr-state =/ =channel [[our ship] now +>.ames-state -.peer-state] :: abet:(on-west:(make-peer-core peer-state channel) message) :: +make-peer-core: create nested |peer-core for per-peer processing :: ++ make-peer-core |= [=peer-state =channel] |% ++ peer-core . ++ emit |=(move peer-core(event-core (^emit +<))) ++ abet ^+ event-core :: =. peers.ames-state (~(put by peers.ames-state) her.channel %known peer-state) :: event-core :: +on-hear-packet: handle receipt of ack or message fragment :: ++ on-hear-packet |= [=lane =shut-packet] ^+ peer-core :: ?: ?=(%& -.meat.shut-packet) %+ on-hear-fragment %- fall :_ *message-still-state (~(get by rcv.peer-state) bone.shut-packet) [lane shut-packet] :: (on-hear-ack lane shut-packet) :: +on-hear-ack: handle receipt of ack on packet or message, from unix :: ++ on-hear-ack |= [=lane =shut-packet] ^+ peer-core :: distinguish ack on single packet from ack on whole message :: :: TODO: move conditional to message pump? :: =/ task=message-pump-task ?> ?=(%| -.meat.shut-packet) ?: ?=(%& -.p.meat.shut-packet) [%hear-fragment-ack message-num.shut-packet p.p.meat.shut-packet] [%hear-message-ack message-num.shut-packet p.p.meat.shut-packet] :: TODO: is it correct to (mix 1 bone) here? :: (run-message-pump (mix 1 bone.shut-packet) task) :: +run-message-pump: process a $message-pump-task and its effects :: ++ run-message-pump |= [=bone task=message-pump-task] ^+ peer-core :: pass .task to the |message-pump and apply state mutations :: =/ =message-pump-state (fall (~(get by snd.peer-state) bone) *message-pump-state) :: =/ message-pump (make-message-pump message-pump-state channel) =^ pump-gifts message-pump-state (work:message-pump task) =. snd.peer-state (~(put by snd.peer-state) bone message-pump-state) :: =/ client-duct=^duct (~(got by by-bone.ossuary.peer-state) bone) :: process effects from |message-pump :: |^ ^+ peer-core ?~ pump-gifts peer-core =* gift i.pump-gifts =. peer-core ?- -.gift %ack-message (process-ack-message [message-num ok]:gift) %send (process-send static-fragment.gift) %wait (process-wait date.gift) %rest (process-rest date.gift) == $(pump-gifts t.pump-gifts) :: ++ process-ack-message |= [=message-num ok=?] ^+ peer-core :: positive ack gets emitted trivially :: ?: ok (emit client-duct %give %rest ~) :: nack; look up naxplanation or enqueue :: =/ nax-key [bone message-num] :: ?~ naxplanation=(~(get by nax.peer-state) nax-key) :: no naxplanation yet; enqueue :: =. nax.peer-state (~(put by nax.peer-state) nax-key ~) peer-core :: |message-pump should never emit duplicate message acks :: ?> ?=(^ u.naxplanation) :: we have both nack packet and naxplanation; unqueue and emit :: =. nax.peer-state (~(del by nax.peer-state) nax-key) (emit client-duct %give %rest u.naxplanation) :: ++ process-send |= =static-fragment ^+ peer-core :: encrypt and encode .static-fragment to .blob bitstream :: :: XOR .bone with 1 just before sending. TODO: bone docs :: %- send-shut-packet :* our-life.channel her-life.channel (mix 1 bone) message-num.static-fragment %& +.static-fragment == :: ++ process-wait |= date=@da ^+ peer-core :: =/ =wire (pump-timer-wire her.channel bone) (emit client-duct %pass wire %b %wait date) :: ++ process-rest |= date=@da ^+ peer-core :: =/ =wire (pump-timer-wire her.channel bone) (emit client-duct %pass wire %b %rest date) -- :: +on-hear-fragment: handle receipt of message fragment, from unix :: ++ on-hear-fragment |= [=message-still-state =lane =shut-packet] ^+ peer-core :: pass fragment to the |message-still for assembly into message :: =/ message-still (make-message-still message-still-state channel) :: =^ still-gifts message-still-state (work:message-still %hear lane shut-packet) :: =. rcv.peer-state (~(put by rcv.peer-state) bone.shut-packet message-still-state) :: |- ^+ peer-core ?~ still-gifts peer-core :: =* gift i.still-gifts =. peer-core ?- -.gift %hear-message !! :: :: TODO special-case nack? :: %send-ack %- send-shut-packet :* our-life.channel her-life.channel (mix 1 bone.shut-packet) message-num.gift %| ack-meat.gift == == $(still-gifts t.still-gifts) :: +on-west: handle request to send message :: ++ on-west |= =message ^+ peer-core :: =^ =bone ossuary.peer-state (get-bone ossuary.peer-state duct) :: (run-message-pump bone %send message) :: ++ send-shut-packet |= =shut-packet ^+ peer-core :: =/ content (encrypt symmetric-key.channel shut-packet) =/ =packet [[our her.channel] encrypted=%.y origin=~ content] =/ =blob (encode-packet packet) :: send to .her and her sponsors until we find a direct lane :: =/ rcvrs=(list ship) [her her-sponsors]:channel :: |- ^+ peer-core ?~ rcvrs peer-core :: =/ peer (~(get by peers.ames-state) i.rcvrs) :: ?. ?=([~ %known *] peer) $(rcvrs t.rcvrs) :: ?~ route=route.u.+.peer $(rcvrs t.rcvrs) :: =. peer-core (emit unix-duct.ames-state %give %send lane.u.route blob) :: ?: direct.u.route peer-core $(rcvrs t.rcvrs) -- -- :: +make-message-pump: constructor for |message-pump :: ++ make-message-pump |= [state=message-pump-state =channel] =| gifts=(list message-pump-gift) :: |% ++ message-pump . ++ give |=(gift=message-pump-gift message-pump(gifts [gift gifts])) ++ packet-pump (make-packet-pump packet-pump-state.state channel) :: +work: handle a $message-pump-task :: ++ work |= task=message-pump-task ^+ [gifts state] :: =~ ?- -.task %send (on-send message.task) %hear-fragment-ack (on-hear-fragment-ack [message-num fragment-num]:task) :: %hear-message-ack (on-hear-message-ack [message-num ok lag]:task) :: * (run-packet-pump task) == feed-packets (run-packet-pump %finalize ~) [(flop gifts) state] == :: +on-send: handle request to send a message :: ++ on-send |= =message ^+ message-pump :: =. unsent-messages.state (~(put to unsent-messages.state) message) message-pump :: +on-hear-fragment-ack: handle packet acknowledgment :: ++ on-hear-fragment-ack |= [=message-num =fragment-num] ^+ message-pump :: pass to |packet-pump unless duplicate or future ack :: ?. (is-message-num-in-range message-num) message-pump (run-packet-pump %hear-fragment-ack message-num fragment-num) :: +on-hear-message-ack: handle message-level acknowledgment :: ++ on-hear-message-ack |= [=message-num ok=? lag=@dr] ^+ message-pump :: ignore duplicate and future acks :: ?. (is-message-num-in-range message-num) message-pump :: clear and print .unsent-fragments if nonempty :: =? unsent-fragments.state &(=(current next) ?=(^ unsent-fragments)):state :: ~& %early-message-ack^ok^her.channel ~ :: clear all packets from this message from the packet pump :: =. message-pump (run-packet-pump %hear-message-ack message-num lag) :: enqueue this ack to be sent back to local client vane :: =. queued-message-acks.state (~(put by queued-message-acks.state) message-num ok) :: emit local acks from .queued-message-acks until incomplete :: |- ^+ message-pump :: if .current hasn't been fully acked, we're done :: ?~ ack=(~(get by queued-message-acks.state) current.state) message-pump :: .current is complete; pop, emit local ack, and try next message :: =. queued-message-acks.state (~(del by queued-message-acks.state) current.state) :: =. message-pump (give %ack-message current.state ok.u.ack) :: $(current.state +(current.state)) :: +is-message-num-in-range: %.y unless duplicate or future ack :: ++ is-message-num-in-range |= =message-num ^- ? :: ?: (gte message-num next.state) %.n ?: (lth message-num current.state) %.n !(~(has by queued-message-acks.state) message-num) :: +feed-packets: give packets to |packet-pump until full :: ++ feed-packets :: if nothing to send, no-op :: ?: &(=(~ unsent-messages) =(~ unsent-fragments)):state message-pump :: we have unsent fragments of the current message; feed them :: ?. =(~ unsent-fragments.state) =/ res (feed:packet-pump unsent-fragments.state) =+ [unsent packet-pump-gifts packet-pump-state]=res :: =. unsent-fragments.state unsent =. packet-pump-state.state packet-pump-state :: =. message-pump (process-packet-pump-gifts packet-pump-gifts) :: if it sent all of them, feed it more; otherwise, we're done :: ?~ unsent feed-packets message-pump :: .unsent-messages is nonempty; pop a message off and feed it :: =^ message unsent-messages.state ~(get to unsent-messages.state) :: break .message into .chunks and set as .unsent-fragments :: =. unsent-fragments.state :: =/ chunks (rip 13 (jam message)) =/ num-fragments=fragment-num (lent chunks) =| counter=@ :: |- ^- (list static-fragment) ?~ chunks ~ :: :- [message-num=next.state num-fragments counter i.chunks] :: $(chunks t.chunks, counter +(counter)) :: try to feed packets from the next message :: =. next.state +(next.state) feed-packets :: +run-packet-pump: call +work:packet-pump and process results :: ++ run-packet-pump |= =packet-pump-task ^+ message-pump :: =^ packet-pump-gifts packet-pump-state.state (work:packet-pump packet-pump-task) :: (process-packet-pump-gifts packet-pump-gifts) :: +process-packet-pump-gifts: pass |packet-pump effects up the chain :: ++ process-packet-pump-gifts |= packet-pump-gifts=(list packet-pump-gift) ^+ message-pump :: ?~ packet-pump-gifts message-pump =. message-pump (give i.packet-pump-gifts) :: $(packet-pump-gifts t.packet-pump-gifts) -- :: +make-packet-pump: construct |packet-pump core :: ++ make-packet-pump |= [state=packet-pump-state =channel] =| gifts=(list packet-pump-gift) |% ++ packet-pump . ++ give |=(packet-pump-gift packet-pump(gifts [+< gifts])) :: +packet-queue: type for all sent fragments, ordered by sequence number :: ++ packet-queue %- (ordered-map live-packet-key live-packet-val) |= [a=live-packet-key b=live-packet-key] ^- ? :: ?: (lth message-num.a message-num.b) %.y ?: (gth message-num.a message-num.b) %.n (lte fragment-num.a fragment-num.b) :: +gauge: inflate a |pump-gauge to track congestion control :: ++ gauge (make-pump-gauge now.channel metrics.state) :: +work: handle $packet-pump-task request :: ++ work |= task=packet-pump-task ^+ [gifts state] :: =- [(flop gifts) state] :: ?- -.task %hear-fragment-ack (on-hear-fragment-ack [message-num fragment-num]:task) %hear-message-ack (on-hear-message-ack message-num.task) %wake resend-lost(next-wake.state ~) %finalize set-wake == :: +resend-lost: resend as many lost packets as .gauge will allow :: ++ resend-lost ^+ packet-pump :: =- =. packet-pump core.- =. live.state live.- packet-pump :: acc: state to thread through traversal :: :: num-slots: start with max retries; decrement on each resend :: =| $= acc $: num-slots=_num-retry-slots:gauge core=_packet-pump == :: ^+ [acc live=live.state] :: %- (traverse:packet-queue _acc) :: :^ live.state start=~ acc |= $: acc=_acc key=live-packet-key val=live-packet-val == ^- [new-val=(unit live-packet-val) stop=? _acc] :: load mutant environment :: =. packet-pump core.acc :: if we can't send any more packets, we're done :: ?: =(0 num-slots.acc) [`val stop=%.y acc] :: if the packet hasn't expired, we're done :: ?: (gte expiry.val now.channel) [`val stop=%.y acc] :: packet has expired so re-send it :: =/ =static-fragment => [key val] [message-num num-fragments fragment-num fragment] :: =. packet-pump (give %send static-fragment) =. metrics.state (on-resent:gauge -.val) :: update $sent-packet-state in .val and continue :: =. expiry.val (next-retry-expiry:gauge -.val) =. sent-date.val now.channel =. retried.val %.y :: [`val stop=%.n (dec num-slots.acc) packet-pump] :: +feed: try to send a list of packets, returning unsent and effects :: ++ feed |= fragments=(list static-fragment) ^+ [fragments gifts state] :: return unsent back to caller and reverse effects to finalize :: =- [unsent (flop gifts) state] :: ^+ [unsent=fragments packet-pump] :: resend lost packets first, possibly adjusting congestion control :: =. packet-pump resend-lost :: bite off as many fragments as we can send :: =/ num-slots num-slots:gauge =/ sent (scag num-slots fragments) =/ unsent (slag num-slots fragments) :: :- unsent ^+ packet-pump :: if nothing to send, we're done :: ?~ sent packet-pump :: convert $static-fragment's into +ordered-set [key val] pairs :: =/ send-list %+ turn sent |= static-fragment ^- [key=live-packet-key val=live-packet-val] :: :- [message-num fragment-num] :- :+ expiry=next-expiry:gauge sent-date=now.channel retried=%.n [num-fragments fragment] :: update .live and .metrics :: =. live.state (gas:packet-queue live.state send-list) =. metrics.state (on-sent:gauge (lent send-list)) :: TMI :: => .(sent `(list static-fragment)`sent) :: emit a $packet-pump-gift for each packet to send :: |- ^+ packet-pump ?~ sent packet-pump =. packet-pump (give %send i.sent) $(sent t.sent) :: +on-hear-fragment-ack: handle ack on a live packet :: :: Traverse .live from the head, marking packets as lost until we :: find the acked packet. Then delete the acked packet and try to :: resend lost packets. :: :: If we don't find the acked packet, no-op: no mutations, effects, :: or resending of lost packets. :: ++ on-hear-fragment-ack |= [=message-num =fragment-num] ^+ packet-pump :: =- :: if no sent packet matches the ack, don't apply mutations or effects :: ?. found.- packet-pump :: =. metrics.state metrics.- =. live.state live.- :: resend-lost :: ^- $: [found=? metrics=pump-metrics] live=(tree [live-packet-key live-packet-val]) == :: =/ acc=[found=? metrics=pump-metrics] [%.n metrics.state] :: %- (traverse:packet-queue _acc) :: :^ live.state start=~ acc |= $: acc=_acc key=live-packet-key val=live-packet-val == ^- [new-val=(unit live-packet-val) stop=? _acc] :: =/ gauge (make-pump-gauge now.channel metrics.acc) :: is this the acked packet? :: ?: =(key [message-num fragment-num]) :: delete acked packet, update metrics, and stop traversal :: :+ new-val=~ stop=%.y [found=%.y metrics=(on-ack:gauge -.val)] :: ack was out of order; mark expired, tell gauge, and continue :: :+ new-val=`val(expiry `@da`0) stop=%.n [found=%.n metrics=(on-skipped-packet:gauge -.val)] :: +on-hear-message-ack: apply ack to all packets from .message-num :: ++ on-hear-message-ack |= =message-num ^+ packet-pump :: =- =. metrics.state metrics.- =. live.state live.- :: resend-lost :: ^- $: metrics=pump-metrics live=(tree [live-packet-key live-packet-val]) == :: %- (traverse:packet-queue pump-metrics) :: :^ live.state start=~ acc=metrics.state |= $: metrics=pump-metrics key=live-packet-key val=live-packet-val == ^- [new-val=(unit live-packet-val) stop=? pump-metrics] :: =/ gauge (make-pump-gauge now.channel metrics) :: if ack was out of order, mark expired and continue :: ?: (lth message-num.key message-num) :+ new-val=`val(expiry `@da`0) stop=%.n metrics=(on-skipped-packet:gauge -.val) :: if packet was from acked message, delete it and continue :: ?: =(message-num.key message-num) [new-val=~ stop=%.n metrics=(on-ack:gauge -.val)] :: we've gone past the acked message; we're done :: [new-val=`val stop=%.y metrics] :: +set-wake: set, unset, or reset timer, emitting moves :: ++ set-wake ^+ packet-pump :: if nonempty .live, peek at head to get next wake time :: =/ new-wake=(unit @da) ?~ head=(peek:packet-queue live.state) ~ `expiry.val.u.head :: no-op if no change :: ?: =(new-wake next-wake.state) packet-pump :: unset old timer if non-null :: =? packet-pump !=(~ next-wake.state) =/ old (need next-wake.state) =. next-wake.state ~ (give %rest old) :: set new timer if non-null :: =? packet-pump ?=(^ new-wake) =. next-wake.state new-wake (give %wait u.new-wake) :: packet-pump -- :: +make-pump-gauge: construct |pump-gauge congestion control core :: :: TODO: actual congestion control :: ++ make-pump-gauge |= [now=@da pump-metrics] =* metrics +<+ |% :: +next-expiry: when should a newly sent fresh packet time out? :: ++ next-expiry ^- @da :: (add now ~s5) :: +next-retry-expiry: when should a resent packet time out? :: ++ next-retry-expiry |= sent-packet-state ^- @da (add now ~s10) :: +has-slot: can we send a packet right now? :: ++ has-slot ^- ? (gth num-slots 0) :: +num-slots: how many packets can we send right now? :: ++ num-slots ^- @ud ?. (gth max-live num-live) 0 (sub max-live num-live) :: +num-retry-slots: how many lost packets can we resend right now? :: ++ num-retry-slots ^- @ud max-live :: +on-skipped-packet: adjust metrics based on a misordered ack :: :: TODO: decrease .max-live :: ++ on-skipped-packet |= sent-packet-state metrics :: +on-ack: adjust metrics based on a packet getting acknowledged :: :: TODO: adjust .rtt and .max-live :: ++ on-ack |= sent-packet-state ^- pump-metrics :: metrics(num-live (dec num-live)) :: +on-sent: adjust metrics based on sending .num-sent fresh packets :: ++ on-sent |= num-sent=@ud ^- pump-metrics :: metrics(num-live (add num-sent num-live)) :: +on-resent: adjust metrics based on retrying an expired packet :: ++ on-resent |= sent-packet-state ^- pump-metrics metrics -- :: :: ++ make-message-still |= [=message-still-state =channel] =| gifts=(list message-still-gift) |% ++ work |= task=message-still-task ^+ [gifts message-still-state] :: =- [(flop -.-) +.-] :: ?- -.task %hear (on-hear [lane shut-packet]:task) %done (on-done [message-num error]:task) == :: :: ++ on-hear |= [=lane =shut-packet] ^+ [gifts message-still-state] :: !! :: :: ++ on-done |= [=message-num error=(unit error)] ^+ [gifts message-still-state] :: !! -- :: +get-bone: find or make new bone for .duct in .ossuary :: ++ get-bone |= [=ossuary =duct] ^+ [next-bone.ossuary ossuary] :: ?^ existing=(~(get by by-duct.ossuary) duct) [u.existing ossuary] :: :- next-bone.ossuary :+ (add 2 next-bone.ossuary) (~(put by by-duct.ossuary) duct next-bone.ossuary) (~(put by by-bone.ossuary) next-bone.ossuary duct) :: :: ++ pump-timer-wire |= [her=ship =bone] ^- wire /pump/(scot %p her)/(scot %ud bone) :: +encrypt: encrypt $shut-packet into atomic packet content :: ++ encrypt |= [=symmetric-key plaintext=shut-packet] ^- @ :: (en:crub:crypto symmetric-key (jam plaintext)) :: +decrypt: decrypt packet content to a $shut-packet or die :: ++ decrypt |= [=symmetric-key ciphertext=@] ^- shut-packet :: ;; shut-packet %- cue %- need (de:crub:crypto symmetric-key ciphertext) :: +encode-packet: serialize a packet into a bytestream :: ++ encode-packet |= packet ^- blob :: =/ sndr-meta (encode-ship-metadata sndr) =/ rcvr-meta (encode-ship-metadata rcvr) :: body: <> :: :: The .sndr and .rcvr ship addresses are encoded with fixed :: lengths specified by the packet header. They live outside :: the jammed-data section to simplify packet filtering in the :: interpreter. :: =/ body=@ ;: mix sndr (lsh 3 size.sndr-meta rcvr) (lsh 3 (add size.sndr-meta size.rcvr-meta) (jam [origin content])) == :: header: 32-bit header assembled from bitstreams of fields :: :: <> :: 4 bits at the end of the header are unused. :: =/ header=@ %+ can 0 :~ [3 protocol-version] [20 (mug body)] [2 rank.sndr-meta] [2 rank.rcvr-meta] [5 ?:(encrypted %0 %1)] == :: result is <
> :: (mix header (lsh 5 1 body)) :: +decode-packet: deserialize packet from bytestream or crash :: ++ decode-packet |= =blob ^- packet :: first 32 (2^5) bits are header; the rest is body :: =/ header (end 5 1 blob) =/ body (rsh 5 1 blob) :: =/ version (end 0 3 header) =/ checksum (cut 0 [3 20] header) =/ sndr-size (decode-ship-size (cut 0 [23 2] header)) =/ rcvr-size (decode-ship-size (cut 0 [25 2] header)) =/ encrypted ?+((cut 0 [27 5] header) !! %0 %.y, %1 %.n) :: ?> =(protocol-version version) ?> =(checksum (end 0 20 (mug body))) :: =/ =dyad :- sndr=(end 3 sndr-size body) rcvr=(cut 3 [sndr-size rcvr-size] body) :: =+ ;; [origin=(unit @uxlane) content=*] %- cue (rsh 3 (add rcvr-size sndr-size) body) :: [dyad encrypted origin content] :: +decode-ship-size: decode a 2-bit ship type specifier into a byte width :: :: Type 0: galaxy or star -- 2 bytes :: Type 1: planet -- 4 bytes :: Type 2: moon -- 8 bytes :: Type 3: comet -- 16 bytes :: ++ decode-ship-size |= rank=@ ^- @ :: ?+ rank !! %0 2 %1 4 %2 8 %3 16 == :: +encode-ship-metadata: produce size (in bytes) and address rank for .ship :: :: 0: galaxy or star :: 1: planet :: 2: moon :: 3: comet :: ++ encode-ship-metadata |= =ship ^- [size=@ =rank] :: =/ size=@ (met 3 ship) :: ?: (lte size 2) [2 %0] ?: (lte size 4) [4 %1] ?: (lte size 8) [8 %2] [16 %3] --