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Subject: [bitcoin-dev] In defense of a configurable LOT if LOT=false is
released
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--0000000000003d387e05bc7f85a3
Content-Type: text/plain; charset="UTF-8"
The short script* below could function as a cross platform (need only have
python 2 and curl) way to make a LOT=False function like a LOT=true node.
This sort of script was mentioned recently in the ##taproot-activation IRC
channel.
It is unclear to me with this sort of script what happens if a LOT=false
but running this script announces a to-be-marked-bad block to a similar
peer that has already marked that block invalid. It could lead to nodes
partitioning themselves from one another, but I am uncertain of the
particulars of invalidate block's relationship to DoS rules.
Therefore it may be a harm reduction, should core release with LOT=false,
to have opt-in configurability natively. Configurability is superior to a
situation where, near to the timeout with LOT=true seeming more likely,
users unable to switch binaries reach for such a convenience script.
The counterargument would be that running a script is still a hoop to jump
through more difficult than a config flag and we don't want user's choosing
consensus rules via config flags. However, it seems more in the spirit of
user choice to make the core release suitable for either preference.
*completely untested, unverified, never even run mind you -- obviously needs
review before actually running it
1 import sys, json, subprocess
2 from time import sleep
3 LOTHEIGHT=600000
4 LOTSTOP= LOTHEIGHT + 2016
5 FORK="taproot"
6 credential="blah:blah"
7 host = "http://127.0.0.1:8332"
8 contenttype ='content-type:text/plain;'
9 def make_command(command, args):
10 return json.dumps({"jsonrpc": "1.0",
11 "id":"curltext",
12 "method": command,
13 "params": args})
14 def call(command, args):
15 res = subprocess.run("curl", ["--user", credential,
"--data-binary", make_command(command, args), "-H", contenttype, host])
16 return res.stdout
17
18 should_sleep = False
19 while True:
20 if should_sleep: sleep(10)
21 should_sleep = True
22 try:
23 data = json.load(call("getblockchaininfo", []))
24 possible = True
25 if data['blocks'] >= LOTHEIGHT and data['blocks'] <
LOTSTOP:
26 if not
data['softforks'][FORK]['statistics']['possible']:
27 call("invalidateblock", [data["bestblockhash"]])
28 should_sleep = False
29 except: pass
--0000000000003d387e05bc7f85a3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div><span class=3D"gmail_default" style=3D"font-family:ar=
ial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">T</span>he <span=
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fo=
nt-size:small;color:rgb(0,0,0)">short</span> script<span class=3D"gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small;color=
:rgb(0,0,0)">*</span> below<span class=3D"gmail_default" style=3D"font-fami=
ly:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)"></span> <sp=
an class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;=
font-size:small;color:rgb(0,0,0)">could </span>function as a cross platform=
(need only have python 2 and curl) way to make a LOT=3DFalse function like=
a<span class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small;color:rgb(0,0,0)"> LOT=3Dtrue node. This sort of scrip=
t was mentioned recently in the ##taproot-activation IRC channel.<br></span=
></div><div><span class=3D"gmail_default" style=3D"font-family:arial,helvet=
ica,sans-serif;font-size:small;color:rgb(0,0,0)"><br></span></div><div><spa=
n class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;f=
ont-size:small;color:rgb(0,0,0)"><span class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)"></spa=
n><span class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small;color:rgb(0,0,0)">It is unclear to me with this sort o=
f script what happens if a LOT=3Dfalse but running this script announces a =
to-be-marked-bad block to a similar peer that has already marked that block=
invalid. It could lead to nodes partitioning themselves from one another, =
but I am uncertain of the particulars of invalidate block's relationshi=
p to DoS rules.<br></span></span></div><div><span class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,=
0,0)"><br></span></div><div><span class=3D"gmail_default" style=3D"font-fam=
ily:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">Therefore =
it may be a harm reduction, should core release with LOT=3Dfalse, to have o=
pt-in configurability natively. Configurability is superior to a situation =
where, near to the timeout with LOT=3Dtrue seeming more likely, users unabl=
e to switch binaries reach for such a convenience script.<br></span></div><=
div><span class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif;font-size:small;color:rgb(0,0,0)"><br></span></div><div><span class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small;color:rgb(0,0,0)">The counterargument would be that running a scrip=
t is still a hoop to jump through more difficult than a config flag and we =
don't want user's choosing consensus rules via config flags. Howeve=
r, it seems more in the spirit of user choice to make the core release suit=
able for either preference.<br></span></div><div><span class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:r=
gb(0,0,0)"><br></span></div><div><span class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)"></spa=
n><span class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small;color:rgb(0,0,0)">*<span class=3D"gmail_default" style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)=
"></span>completely untested<span class=3D"gmail_default" style=3D"font-fam=
ily:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">,</span> u=
nverified<span class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small;color:rgb(0,0,0)">, never even run</span> mind =
you -- obviously <span class=3D"gmail_default" style=3D"font-family:arial,h=
elvetica,sans-serif;font-size:small;color:rgb(0,0,0)">needs review </span>b=
efore actually running it</span></div><br><span class=3D"gmail_default" sty=
le=3D"font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,=
0)"> </span>1 =C2=A0 =C2=A0 =C2=A0 =C2=A0 import sys, json, subprocess<br>=
=C2=A02 =C2=A0 =C2=A0 =C2=A0 =C2=A0 from time import sleep<br>=C2=A03 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 LOTHEIGHT=3D600000<br>=C2=A04 =C2=A0 =C2=A0 =C2=A0=
=C2=A0 LOTSTOP=3D LOTHEIGHT + 2016<br>=C2=A05 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
FORK=3D"taproot"<br>=C2=A06 =C2=A0 =C2=A0 =C2=A0 =C2=A0 credentia=
l=3D"blah:blah"<br>=C2=A07 =C2=A0 =C2=A0 =C2=A0 =C2=A0 host =3D &=
quot;<a href=3D"http://127.0.0.1:8332">http://127.0.0.1:8332</a>"<br>=
=C2=A08 =C2=A0 =C2=A0 =C2=A0 =C2=A0 contenttype =3D'content-type:text/p=
lain;'<br>=C2=A09 =C2=A0 =C2=A0 =C2=A0 =C2=A0 def make_command(command,=
args):<br>10 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return json.dumps({=
"jsonrpc": "1.0",<br>11 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 "id":"curltext",<br>12 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 "method": command,<br>13 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 "params": args})<br>14 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 def call(command, args):<br>15 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 res =3D subprocess.run("curl", ["--user", cr=
edential, "--data-binary", make_command(command, args), "-H&=
quot;, contenttype, host])<br>16 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
return res.stdout<br>17 =C2=A0<br>18 =C2=A0 =C2=A0 =C2=A0 =C2=A0 should_sle=
ep =3D False<br>19 =C2=A0 =C2=A0 =C2=A0 =C2=A0 while True:<br>20 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if should_sleep: sleep(10)<br>21 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 should_sleep =3D True<br>22 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 try:<br>23 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 data =3D json.load(call("getblockchaininfo",=
[]))<br>24 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 possibl=
e =3D True<br>25 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if=
data['blocks'] =C2=A0>=3D LOTHEIGHT and data['blocks'] =
< LOTSTOP:<br>26 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0 =C2=A0 if not data['softforks'][FORK]['statistics']=
['possible']:<br>27 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 call("invalidateblock", [d=
ata["bestblockhash"]])<br>28 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 should_sleep =3D False<br>=
29 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 except: pass<br><br></div>
--0000000000003d387e05bc7f85a3--
|
