Absorbed by the Syndesizer
https://git.syndicate-lang.org/ehmry/syndicate_utils
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36
README.md
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README.md
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# websocket_actor
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A [syndicated actor](https://syndicate-lang.org/) for communicating JSON to websocket servers.
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The actor observes `{dataspace: #!any url: string }` assertions and connects to a websocket endpoint. During the lifetime of the connection a `<connected $URL>` assertion is made. Messages recieved from the server are sent to the dataspace wrapped in `<recv …>` records and messages observed as `<send …>` are sent to the server.
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Unfortunately this utility is only as useful and reasonable as the websocket server it is connected to.
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## Example:
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### Syndicate server configuration:
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```
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<require-service <daemon websocket_actor>>
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<daemon websocket_actor {
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argv: ["/bin/websocket_actor"]
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protocol: application/syndicate
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env: { BUILD_SUM: $sum }
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}>
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let ?exported-dataspace = dataspace
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<service-object <daemon websocket_actor> ?cap> [
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$cap { dataspace: $exported-dataspace url: "ws://127.0.0.1:5225/" }
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]
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<bind <ref { oid: "syndicate" key: #x"" }> $exported-dataspace #f>
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```
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### Shell
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```
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# Use the "syndump" utility to log '<recv …>' records from the background.
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syndump '<recv ?>' &
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# Use the "msg" utilite to send '<send …>' records.
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# The message command wraps its arguments in a record with a label set to argv[0].
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cp $(which msg) send
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send '{ type: "command" body: { type: "body" text: "fuck off webdevs"} }'
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```
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Absorbed by the [Syndesizer](https://git.syndicate-lang.org/ehmry/syndicate_utils).
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include ../syndicate-nim/depends.tup
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NIM_FLAGS += --path:$(TUP_CWD)/../syndicate-nim/src
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NIM_FLAGS += --path:$(TUP_CWD)/../nimble/ws/src
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NIM_GROUPS += $(TUP_CWD)/<lock>
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{"depends":[{"method":"fetchzip","packages":["hashlib"],"path":"/nix/store/v03nzlpdgbfxd2zhcnkfbkq01d5kqxcl-source","rev":"84e0247555e4488594975900401baaf5bbbfb53","sha256":"1pfczsv8kl36qpv543f93d2y2vgz2acckssfap7l51s2x62m6qwx","srcDir":"","url":"https://github.com/khchen/hashlib/archive/84e0247555e4488594975900401baaf5bbbfb53.tar.gz"},{"method":"fetchzip","packages":["nimcrypto"],"path":"/nix/store/zyr8zwh7vaiycn1s4r8cxwc71f2k5l0h-source","ref":"traditional-api","rev":"602c5d20c69c76137201b5d41f788f72afb95aa8","sha256":"1dmdmgb6b9m5f8dyxk781nnd61dsk3hdxqks7idk9ncnpj9fng65","srcDir":"","url":"https://github.com/cheatfate/nimcrypto/archive/602c5d20c69c76137201b5d41f788f72afb95aa8.tar.gz"},{"method":"fetchzip","packages":["npeg"],"path":"/nix/store/ffkxmjmigfs7zhhiiqm0iw2c34smyciy-source","ref":"1.2.1","rev":"26d62fdc40feb84c6533956dc11d5ee9ea9b6c09","sha256":"0xpzifjkfp49w76qmaylan8q181bs45anmp46l4bwr3lkrr7bpwh","srcDir":"src","url":"https://github.com/zevv/npeg/archive/26d62fdc40feb84c6533956dc11d5ee9ea9b6c09.tar.gz"},{"method":"fetchzip","packages":["preserves"],"path":"/nix/store/nrxd0z8mxmdphw49c6p4n9lmmq0iq5pq-source","ref":"20231019","rev":"a2dc5becc0596d52ab205d869b7c167c0b562fb4","sha256":"09jygr7ynzh6vp2p54dgq2qz651d3lgvypkjwjp74zzp3jgwz7g5","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/preserves-nim/archive/a2dc5becc0596d52ab205d869b7c167c0b562fb4.tar.gz"},{"method":"fetchzip","packages":["syndicate"],"path":"/nix/store/1y3nnpp2mhxqmdb3xh4c4k5k5l9hhqk3-source","ref":"20231019","rev":"57b99b20e7db1b97b1cb9c6df574bd13983c26fc","sha256":"1kgb3a78igs37xkmv8cbaxa17qdjf2h43vdmpda517c9086ggsn5","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/syndicate-nim/archive/57b99b20e7db1b97b1cb9c6df574bd13983c26fc.tar.gz"},{"method":"fetchzip","packages":["ws"],"path":"/nix/store/zd51j4dphs6h1hyhdbzdv840c8813ai8-source","ref":"0.5.0","rev":"9536bf99ddf5948db221ccb7bb3663aa238a8e21","sha256":"0j8z9jlvzb1h60v7rryvh2wx6vg99lra6i62whf3fknc53l641fz","srcDir":"src","url":"https://github.com/treeform/ws/archive/9536bf99ddf5948db221ccb7bb3663aa238a8e21.tar.gz"}]}
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let
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syndicate = builtins.getFlake "syndicate";
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pkgs =
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import <nixpkgs> { overlays = builtins.attrValues syndicate.overlays; };
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in pkgs.nim2Packages.syndicate_utils
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include_rules
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: websocket_actor.nim | $(SYNDICATE_PROTOCOL) ../<schema> |> !nim_bin |> {bin}
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: {bin} |> !assert_built |>
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# SPDX-FileCopyrightText: ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[asyncdispatch, json]
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import preserves, preserves/jsonhooks
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import syndicate
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from syndicate/relays import connectStdio
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import ws
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type
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Args* {.preservesDictionary.} = object
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dataspace: Cap
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url: string
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SendJson* {.preservesRecord: "send".} = object
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data: JsonNode
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RecvJson* {.preservesRecord: "recv".} = object
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data: JsonNode
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runActor("websocket-json-actor") do (root: Cap; turn: var Turn):
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connectStdio(turn, root)
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during(turn, root, ?Args) do (ds: Cap, url: string):
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let facet = turn.facet
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var
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ws: WebSocket
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connectedHandle: Handle
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newWebSocket(url).addCallback(turn) do (turn: var Turn; sock: WebSocket):
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ws = sock
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let connectedHandle = publish(turn, ds, initRecord("connected", url.toPreserve))
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var fut: Future[(Opcode, string)]
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proc recvMessage() {.gcsafe.} =
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fut = receivePacket ws
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addCallback(fut, facet) do (turn: var Turn):
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let (opcode, data) = read fut
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case opcode
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of Text:
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message(turn, ds,
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RecvJson(data: data.parseJson))
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of Binary:
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message(turn, ds,
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initRecord("recv", cast[seq[byte]](data).toPreserve))
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of Ping:
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asyncCheck(turn, ws.send(data, Pong))
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of Pong, Cont:
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discard
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of Close:
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retract(turn, connectedHandle)
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stderr.writeLine "closed connection with ", url
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stop(turn)
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return
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recvMessage()
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recvMessage()
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onMessage(turn, ds, ?SendJson) do (data: JsonNode):
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asyncCheck(turn, ws.send($data, Text))
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do:
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close(ws)
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bin = @["websocket_actor"]
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license = "Unlicense"
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srcDir = "src"
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version = "20231021"
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requires "nim", "syndicate", "ws"
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