msgflo
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Polyglot FBP runtime based on message queues
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text/coffeescript
# Implementation of the FBP protocol
# http://noflojs.org/documentation/protocol
debug = require('debug')('msgflo:fbp')
EventEmitter = require('events').EventEmitter
handleMessage = (proto, sub, cmd, payload, ctx) ->
debug 'RECV:', sub, cmd, payload
defaultGraph = 'default/main'
if sub == 'runtime' and cmd == 'getruntime'
runtime =
type: 'msgflo'
version: '0.4'
capabilities: [
'protocol:component'
'protocol:graph'
'protocol:network'
'component:getsource'
'component:setsource'
]
graph: defaultGraph
proto.transport.send 'runtime', 'runtime', runtime, ctx
else if sub == 'runtime' and cmd == 'packet'
proto.coordinator.sendToExportedPort payload.port, payload.payload, (err) ->
return proto.transport.send 'runtime', 'error', err if err
# No ACK in this case apparently, as it is interpreted as output
# Component
else if sub == 'component' and cmd == 'list'
getPorts = (participant, type) ->
out = []
for port in participant[type]
m =
id: port.id
type: port.type
description: ""
addressable: false
required: false # TODO: implement
out.push m
return out
debug 'attempting to list components'
components = []
for name, part of proto.coordinator.participants
continue if part.component in components # Avoid duplicates
components.push part.component
info =
name: part.component
description: part.label or "" # FIXME: should be .description instead?
icon: part.icon
subgraph: false # TODO: implement
inPorts: getPorts part, 'inports'
outPorts: getPorts part, 'outports'
proto.transport.send 'component', 'component', info, ctx
for name, cmd of proto.coordinator.library.components
# XXX: we don't know anything about these apart from the name and command
# when it has been instantiated first time we'll know the correct values, and should re-send
continue if name in components
components.push name
info =
name: name
description: cmd
icon: null
subgraph: false
inPorts: []
outPorts: []
proto.transport.send 'component', 'componentsready', components.length, ctx
debug 'sent components', components.length
else if sub == 'component' and cmd == 'getsource'
return debug 'ERROR: cannot get source for #{payload.name}' if payload.name != defaultGraph
sendSource = () ->
graph = proto.coordinator.serializeGraph 'main'
resp =
code: JSON.stringify graph
name: 'main'
library: 'default'
language: 'json'
proto.transport.send 'component', 'source', resp, ctx
setTimeout sendSource, 0
else if sub == 'component' and cmd == 'source'
p = payload
proto.coordinator.addComponent p.name, p.language, p.code, (err) ->
return proto.transport.send 'component', 'error', err, ctx if err
return proto.transport.sendAll 'component', 'source', payload
# Network
else if sub == 'network' and cmd == 'start'
proto.coordinator.startNetwork payload.graph, (err) ->
return proto.transport.sendAll 'network', 'error', err if err
proto.transport.sendAll 'network', 'started',
running: true
started: true
graph: payload.graph
time: new Date()
else if sub == 'network' and cmd == 'stop'
proto.coordinator.stopNetwork payload.graph, (err) ->
return proto.transport.sendAll 'network', 'error', err if err
proto.transport.sendAll 'network', 'stopped',
running: false
started: true
graph: payload.graph
time: new Date()
# Graph
else if sub == 'graph'
handleGraphMessage proto, cmd, payload, ctx
else
debug 'Unhandled FBP protocol message: ', sub, cmd
handleGraphMessage = (proto, cmd, payload, ctx) ->
graph = payload.graph
if cmd == 'clear'
# FIXME: support multiple graphs
else if cmd == 'addnode'
proto.coordinator.startParticipant payload.id, payload.component, (err) ->
return proto.transport.send 'graph', 'error', err, ctx if err
proto.transport.sendAll 'graph', 'addnode', payload
else if cmd == 'removenode'
proto.coordinator.stopParticipant payload.id, payload.component, (err) ->
return proto.transport.send 'graph', 'error', err, ctx if err
proto.transport.sendAll 'graph', 'removenode', payload
# Connections
else if cmd == 'addedge'
debug 'addedge', payload
p = payload
proto.coordinator.connect p.src.node, p.src.port, p.tgt.node, p.tgt.port, (err) ->
return proto.transport.send 'graph', 'error', err, ctx if err
proto.transport.sendAll 'graph', 'addedge', payload
else if cmd == 'removeedge'
p = payload
proto.coordinator.disconnect p.src.node, p.src.port, p.tgt.node, p.tgt.port
proto.transport.sendAll 'graph', 'removeedge', payload
# IIPs
else if cmd == 'addinitial'
proto.coordinator.addInitial payload.tgt.node, payload.tgt.port, payload.src.data
proto.transport.sendAll 'graph', 'addinitial', payload
else if cmd == 'removeinitial'
proto.coordinator.removeInitial payload.tgt.node, payload.tgt.port
proto.transport.sendAll 'graph', 'removeinitial', payload
# exported ports
else if cmd == 'addinport'
proto.coordinator.exportPort 'inport', payload.public, payload.node, payload.port, (err) ->
return proto.transport.send 'graph', 'error', err, ctx if err
proto.transport.sendAll 'graph', 'addinport', payload
else if cmd == 'addoutport'
proto.coordinator.exportPort 'outport', payload.public, payload.node, payload.port, (err) ->
return proto.transport.send 'graph', 'error', err, ctx if err
proto.transport.sendAll 'graph', 'addoutport', payload
else
debug 'Unhandled FBP protocol message: ', 'graph', cmd
class Protocol
constructor: (@transport, @coordinator) ->
throw Error 'Protocol' if not @coordinator
@coordinator.on 'exported-port-data', (port, data, graph) =>
@transport.sendAll 'runtime', 'packet',
port: port
event: 'data'
payload: data
graph: graph
@transport.on 'message', (protocol, command, payload, ctx) =>
handleMessage @, protocol, command, payload, ctx
@coordinator.on 'data', (from, fromPort, to, toPort, data) =>
debug 'on data', from, fromPort, data
id = "#{from}() #{fromPort.toUpperCase()} -> #{toPort.toUpperCase()} #{to}()"
msg =
id: id # FIXME: https://github.com/noflo/noflo-ui/issues/293
graph: 'default/main' # FIXME: unhardcode
src:
node: from
port: fromPort
tgt:
node: to
port: toPort
data: data
@transport.sendAll 'network', 'data', msg
exports.Protocol = Protocol