urbit/pkg/arvo/ted/azimuth-tracker.hoon

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/- spider
/+ strandio, *azimuth
=, strand=strand:spider
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=, able:jael
|%
+$ pending-udiffs (map number:block udiffs:point)
+$ app-state
$: %2
url=@ta
=number:block
=pending-udiffs
blocks=(list block)
whos=(set ship)
==
+$ in-poke-data
$% [%listen whos=(list ship) =source:jael]
[%watch url=@ta]
==
+$ in-peer-data ~
--
::
:: Async helpers
::
|%
++ topics
|= ships=(set ship)
^- (list ?(@ux (list @ux)))
:: The first topic should be one of these event types
::
:- => azimuth-events:azimuth
:~ broke-continuity
changed-keys
lost-sponsor
escape-accepted
==
:: If we're looking for a specific set of ships, specify them as
:: the second topic. Otherwise don't specify the second topic so
:: we will match all ships.
::
?: =(~ ships)
~
[(turn ~(tap in ships) ,@) ~]
::
++ get-logs-by-hash
|= [url=@ta whos=(set ship) =hash:block]
=/ m (strand udiffs:point)
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^- form:m
;< =json bind:m
%+ request-rpc url
:* `'logs by hash'
%eth-get-logs-by-hash
hash
~[azimuth:contracts:azimuth]
(topics whos)
==
=/ event-logs=(list event-log:rpc:ethereum)
(parse-event-logs:rpc:ethereum json)
=/ =udiffs:point (event-logs-to-udiffs event-logs)
(pure:m udiffs)
::
++ get-logs-by-range
|= [url=@ta whos=(set ship) =from=number:block =to=number:block]
=/ m (strand udiffs:point)
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^- form:m
;< =json bind:m
%+ request-rpc url
:* `'logs by range'
%eth-get-logs
`number+from-number
`number+to-number
~[azimuth:contracts:azimuth]
(topics whos)
==
=/ event-logs=(list event-log:rpc:ethereum)
(parse-event-logs:rpc:ethereum json)
=/ =udiffs:point (event-logs-to-udiffs event-logs)
(pure:m udiffs)
::
++ event-logs-to-udiffs
|= event-logs=(list =event-log:rpc:ethereum)
^- =udiffs:point
%+ murn event-logs
|= =event-log:rpc:ethereum
^- (unit [=ship =udiff:point])
?~ mined.event-log
~
?: removed.u.mined.event-log
~& [%removed-log event-log]
~
=/ =id:block [block-hash block-number]:u.mined.event-log
=, azimuth-events:azimuth
=, abi:ethereum
?: =(broke-continuity i.topics.event-log)
=/ who=@ (decode-topics t.topics.event-log ~[%uint])
=/ num=@ (decode-results data.event-log ~[%uint])
`[who id %rift num]
?: =(changed-keys i.topics.event-log)
=/ who=@ (decode-topics t.topics.event-log ~[%uint])
=+ ^- [enc=octs aut=octs sut=@ud rev=@ud]
%+ decode-results data.event-log
~[[%bytes-n 32] [%bytes-n 32] %uint %uint]
`[who id %keys rev sut (pass-from-eth:azimuth enc aut sut)]
?: =(lost-sponsor i.topics.event-log)
=+ ^- [who=@ pos=@]
(decode-topics t.topics.event-log ~[%uint %uint])
`[who id %spon ~]
?: =(escape-accepted i.topics.event-log)
=+ ^- [who=@ wer=@]
(decode-topics t.topics.event-log ~[%uint %uint])
`[who id %spon `wer]
~& [%bad-topic event-log]
~
::
++ jael-update
|= =udiffs:point
=/ m (strand ,~)
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|- ^- form:m
=* loop $
?~ udiffs
(pure:m ~)
=/ =path /(scot %p ship.i.udiffs)
=/ cards
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:~ [%give %fact `/ %azimuth-udiff !>(i.udiffs)]
[%give %fact `path %azimuth-udiff !>(i.udiffs)]
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==
;< ~ bind:m (send-raw-cards:strandio cards)
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loop(udiffs t.udiffs)
::
++ handle-azimuth-tracker-poke
=/ m (strand ,in-poke-data)
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^- form:m
;< =vase bind:m
((handle:strandio ,vase) (take-poke:strandio %azimuth-tracker-poke))
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=/ =in-poke-data !<(in-poke-data vase)
(pure:m in-poke-data)
--
::
:: Main loop
::
|%
::
:: Switch eth node
::
++ handle-watch
|= state=app-state
=/ m (strand ,app-state)
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^- form:m
;< =in-poke-data bind:m handle-azimuth-tracker-poke
?. ?=(%watch -.in-poke-data)
ignore:strandio
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(pure:m state(url url.in-poke-data))
::
:: Send %listen to jael
::
++ handle-listen
|= state=app-state
=/ m (strand ,app-state)
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^- form:m
;< =in-poke-data bind:m handle-azimuth-tracker-poke
?. ?=(%listen -.in-poke-data)
ignore:strandio
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=/ card
[%pass /lo %arvo %j %listen (silt whos.in-poke-data) source.in-poke-data]
;< ~ bind:m (send-raw-card:strandio card)
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(pure:m state)
::
:: Start watching a node
::
++ handle-peer
|= state=app-state
=/ m (strand ,app-state)
;< =path bind:m ((handle:strandio ,path) take-watch:strandio)
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=: number.state 0
pending-udiffs.state *pending-udiffs
blocks.state *(list block)
whos.state
=/ who=(unit ship) ?~(path ~ `(slav %p i.path))
?~ who
~
(~(put in whos.state) u.who)
==
::
;< ~ bind:m send-cancel-request:strandio
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(get-updates state)
::
:: Get more blocks
::
++ handle-wake
|= state=app-state
=/ m (strand ,app-state)
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^- form:m
;< ~ bind:m ((handle:strandio ,~) (take-wake:strandio ~))
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(get-updates state)
::
:: Get updates since last checked
::
++ get-updates
|= state=app-state
=/ m (strand ,app-state)
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^- form:m
;< =latest=block bind:m (get-latest-block url.state)
;< state=app-state bind:m (zoom state number.id.latest-block)
|- ^- form:m
=* walk-loop $
?: (gth number.state number.id.latest-block)
;< now=@da bind:m get-time:strandio
;< ~ bind:m (send-wait:strandio (add now ~m5))
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(pure:m state)
;< =block bind:m (get-block-by-number url.state number.state)
;< [=new=pending-udiffs new-blocks=(lest ^block)] bind:m
%- take-block
[url.state whos.state pending-udiffs.state block blocks.state]
=: pending-udiffs.state new-pending-udiffs
blocks.state new-blocks
number.state +(number.id.i.new-blocks)
==
walk-loop
::
:: Process a block, detecting and handling reorgs
::
++ take-block
|= [url=@ta whos=(set ship) =a=pending-udiffs =block blocks=(list block)]
=/ m (strand ,[pending-udiffs (lest ^block)])
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^- form:m
?: &(?=(^ blocks) !=(parent-hash.block hash.id.i.blocks))
(rewind url a-pending-udiffs block blocks)
;< =b=pending-udiffs bind:m
(release-old-events a-pending-udiffs number.id.block)
;< =new=udiffs:point bind:m (get-logs-by-hash url whos hash.id.block)
=. b-pending-udiffs (~(put by b-pending-udiffs) number.id.block new-udiffs)
(pure:m b-pending-udiffs block blocks)
::
:: Release events if they're more than 30 blocks ago
::
++ release-old-events
|= [=pending-udiffs =number:block]
=/ m (strand ,^pending-udiffs)
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^- form:m
=/ rel-number (sub number 30)
=/ =udiffs:point (~(get ja pending-udiffs) rel-number)
;< ~ bind:m (jael-update udiffs)
(pure:m (~(del by pending-udiffs) rel-number))
::
:: Reorg detected, so rewind until we're back in sync
::
++ rewind
|= [url=@ta =pending-udiffs =block blocks=(list block)]
=/ m (strand ,[^pending-udiffs (lest ^block)])
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|- ^- form:m
=* loop $
?~ blocks
(pure:m pending-udiffs block blocks)
?: =(parent-hash.block hash.id.i.blocks)
(pure:m pending-udiffs block blocks)
;< =next=^block bind:m (get-block-by-number url number.id.i.blocks)
?: =(~ pending-udiffs)
;< ~ bind:m (disavow block)
loop(block next-block, blocks t.blocks)
=. pending-udiffs (~(del by pending-udiffs) number.id.block)
loop(block next-block, blocks t.blocks)
::
:: Tell subscribers there was a deep reorg
::
++ disavow
|= =block
=/ m (strand ,~)
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^- form:m
(jael-update [*ship id.block %disavow ~]~)
::
:: Zoom forward to near a given block number.
::
:: Zooming doesn't go forward one block at a time. As a
:: consequence, it cannot detect and handle reorgs. Only use it
:: at a safe distance -- 500 blocks ago is probably sufficient.
::
++ zoom
|= [state=app-state =latest=number:block]
=/ m (strand ,app-state)
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^- form:m
=/ zoom-margin=number:block 100
?: (lth latest-number (add number.state zoom-margin))
(pure:m state)
=/ to-number=number:block (sub latest-number zoom-margin)
;< =udiffs:point bind:m
(get-logs-by-range url.state whos.state number.state to-number)
;< ~ bind:m (jael-update udiffs)
=. number.state +(to-number)
=. blocks.state ~
(pure:m state)
--
::
:: Main
::
^- thread:spider
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|= args=vase
=/ m (strand ,vase)
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^- form:m
;< ~ bind:m
%- (main-loop:strandio ,app-state)
:~ handle-listen
handle-watch
handle-wake
handle-peer
==
(pure:m *vase)