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Wrap TGS bridge requests so they cannot block reboots forever #1825

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Wrap TGS bridge requests so they cannot block reboots forever #1825

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de15136
Wrap TGS bridge requests so they cannot block reboots forever
Kapu1178 Jul 7, 2024
ad2d843
error log
Kapu1178 Jul 7, 2024
e1dac6c
check every tick for 10 seconds
Kapu1178 Jul 7, 2024
430c25a
remove seconds
Kapu1178 Aug 5, 2024
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44 changes: 43 additions & 1 deletion src/DMAPI/tgs/v5/bridge.dm
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Original file line number Diff line number Diff line change
Expand Up @@ -79,7 +79,7 @@

TGS_DEBUG_LOG("Bridge request start")
// This is an infinite sleep until we get a response
var/export_response = world.Export(bridge_request)
var/export_response = ActuallyPerformBridgeRequest(bridge_request)
TGS_DEBUG_LOG("Bridge request complete")

if(!export_response)
Expand Down Expand Up @@ -107,3 +107,45 @@
return

return bridge_response

#define TGS_BRIDGE_WRAP_RETURNED 1
#define TGS_BRIDGE_WRAP_RESPONSE 2

/// world.Export() can hang forever, so we need to give a timeout window.
/datum/tgs_api/v5/proc/ActuallyPerformBridgeRequest(bridge_request)
var/list/bridge_request_tracker = list(
TGS_BRIDGE_WRAP_RETURNED = FALSE,
TGS_BRIDGE_WRAP_RESPONSE = null
)

var/start_time = world.time
while(bridge_request_tracker[TGS_BRIDGE_WRAP_RETURNED] == FALSE)
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if(world.time > (start_time + 300)) // A total of 30 seconds worth of bridge attempts are allowed.
TGS_ERROR_LOG("TGS took too long to respond to a bridge request OR byond couldn't reach TGS.")
return null

WrapBridgeRequest(bridge_request, bridge_request_tracker)
var/poll_start_time = world.time
// Every bridge attempt gets an initial 10 seconds to respond.
while(world.time < poll_start_time + 100)
sleep(world.tick_lag)
if(bridge_request_tracker[TGS_BRIDGE_WRAP_RETURNED] == TRUE)
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return bridge_request_tracker[TGS_BRIDGE_WRAP_RESPONSE]

if(bridge_request_tracker[TGS_BRIDGE_WRAP_RETURNED] == TRUE)
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return bridge_request_tracker[TGS_BRIDGE_WRAP_RESPONSE]

/// Async wrapper around a request, we will poll it later.
/datum/tgs_api/v5/proc/WrapBridgeRequest(bridge_request, list/out)
set waitfor = FALSE

var/response = world.Export(bridge_request)
// Another bridge request fork responded already.
if(out[TGS_BRIDGE_WRAP_RETURNED])
return

out[TGS_BRIDGE_WRAP_RESPONSE] = response
out[TGS_BRIDGE_WRAP_RETURNED] = TRUE

#undef TGS_BRIDGE_WRAP_RETURNED
#undef TGS_BRIDGE_WRAP_RESPONSE
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