mirror of
https://github.com/XeonSquared/OC-Copper.git
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b26a48165d
The light node system should only be used where necessary, as light nodes contribute absolutely nothing to network messaging. Maybe a minified full port of culib could be made for a "medium node", which would be (protocol behavior-wise) exactly like normal nodes, but minified and with interfaces cut down internally.
100 lines
1.9 KiB
Plaintext
100 lines
1.9 KiB
Plaintext
-- I, 20kdc, release this into the public domain.
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-- No warranty is provided, implied or otherwise.
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-- 'Copper' networking implementation
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-- for EEPROM usage. Filters to hostname and broadcast for ease of use.
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-- Expects 'base'.
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-- Variables:
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-- R1 to R4: Tuning parameters in the order in the "big" version.
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-- RT: timers
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-- RA: weAcked
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-- RN: needsAck, but no success callback, so just the timer.
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-- Functions:
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-- RU: Current time.
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-- RP: Add timer.
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-- RK: Kill timer.
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-- RC: Message receive raw.
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-- RF: Refresh system.
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-- RG: Generate 1 random char (as a number)
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-- RS: Send message.
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R1,R2,R3,R4=0x40,60,12,2.5
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RT,RA,RN,RU={},{},{},computer.uptime
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function RP(f,x)
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if#RT<R1 then
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local t={f,RU()+x}
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table.insert(RT,t)
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return t
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end
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end
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function RK(t)
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for i=1,#RT do
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if t==RT[i]then
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table.remove(RT,i)
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end
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end
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end
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function RC(r,f,t,d)
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if d and#d>=7then
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-- Keep in mind the ID used by tables is (originalPacketToName..GID)
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-- ',k' unspecified value "trick"
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local p,b,g,k=d:byte(2)+(d:byte(1)*256),d:byte(7),d:sub(1,5)
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if b==0x01or b==0x00then
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k=t..g
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if not RA[k] then
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r(f,t,p,d:sub(8))
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else
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RK(RA[k])
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end
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RA[k]=RP(function()RA[k]=nil end,R2)
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-- Only ACK under certain conditions.
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if not(b~=0x01or t~=TH)then
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TS(f,d:sub(1,6).."\x02")
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end
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end
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k=f..g
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if b==0x02 and RN[k]then
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RK(RN[k])
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RN[k]=nil
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end
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end
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end
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-- Refresh function to clean up & execute timers.
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function RF()
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local i,t=1,RU()
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while#RT>i do
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if t>RT[i][2]then
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table.remove(RT,i)[1]()
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else
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i=i+1
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end
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end
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end
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-- It is shorter to have this than not have it or localize it. *sigh*
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function RG()
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return math.random(256)-1
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end
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function RS(t,p,d)
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-- j,x unspecified. x is used in j.
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local g,a,j,x=S.char(math.floor(p/256),p%256,RG(),RG(),RG()),-1
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j=function()
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a=a+1
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x=nil
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if a~=R3 then
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TS(t,g..S.char(a,1)..d)
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x=RP(j,R4)
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end
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RN[t..g]=x
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end j()
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end
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