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conn: more docs cleanup, describe %ovum updates

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Jōshin 2022-02-10 23:32:21 -08:00
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1 changed files with 21 additions and 14 deletions
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35
pkg/urbit/vere/io/conn.c
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@ -35,7 +35,7 @@
** **
** responses to %fyrd are either %fail if something went wrong ** responses to %fyrd are either %fail if something went wrong
** in the driver, or %avow to indicate success or failure from ** in the driver, or %avow to indicate success or failure from
** %khan. +avow is: (each (cask) goof). ** %khan. $avow is: (each (cask) goof).
** **
** %peek is a namespace read request (aka scry), and will be ** %peek is a namespace read request (aka scry), and will be
** forwarded directly to arvo. its arguments are the nom of the ** forwarded directly to arvo. its arguments are the nom of the
@ -49,16 +49,26 @@
** **
** %peel is a runtime "peek". it exposes an unprincipled ** %peel is a runtime "peek". it exposes an unprincipled
** scry-like namespace allowing querying of various metrics ** scry-like namespace allowing querying of various metrics
** about the state of vere. /help produces a list of available ** about the state of vere. it accepts $path-like arguments,
** commands. /args produces the command-line arguments used to ** i.e. nul-terminated lists of $knot. it responds as scry
** start vere. /vars produces runtime metrics at the moment in ** does, with a (unit (unit)), where ~ means "request was not
** time that the request was received. ** understood" and [~ ~] means "request understood; empty
** response."
**
** the %peek path /help produces a list of available commands.
** /args produces the command-line arguments used to start vere.
** /vars produces runtime metrics at the moment in time that the
** request was received.
** **
** %ovum is a raw kernel move, to be injected directly into ** %ovum is a raw kernel move, to be injected directly into
** arvo. needless to say this will void your warranty. usually ** arvo. needless to say this will void your warranty. usually
** you want to use %fyrd instead. ** you want to use %fyrd instead. updates will be sent tracking
** the ovum lifecycle: %work when work begins, %done when it
** is finished, %drop if it is dropped, and %bail with a stack
** trace if it fails.
** **
** %urth is a command for the runtime. ** %urth is a command for the runtime. these are acked with %.y
** on receipt. no further updates are provided.
** **
** messages use newt framing. because the framing begins with ** messages use newt framing. because the framing begins with
** a magic byte (^I, horizontal tab), any messages that do not ** a magic byte (^I, horizontal tab), any messages that do not
@ -420,13 +430,7 @@ _conn_ovum_news(u3_ovum* egg_u, u3_ovum_news new_e)
} }
} }
/* _conn_read_peel(): produces response to a %peel request. /* _conn_read_peel(): response to a %peel request, sans rid.
**
** %peel is a runtime scry-like interface. it accepts $path-like
** arguments, i.e. nul-terminated lists of $knot. it responds
** as scry does, with a (unit (unit)), where ~ means "request
** was not understood" and `~ means "request understood; empty
** response".
*/ */
static u3_noun static u3_noun
_conn_read_peel(u3_conn* con_u, u3_noun dat) _conn_read_peel(u3_conn* con_u, u3_noun dat)
@ -498,6 +502,9 @@ _conn_read_peel(u3_conn* con_u, u3_noun dat)
// //
case c3__vars: { case c3__vars: {
if ( c3n == u3K.pir_u->liv_o ) { if ( c3n == u3K.pir_u->liv_o ) {
// empty response if pier is not yet live, since ames
// state may not yet be wired up.
//
res = u3nc(u3_nul, u3_nul); res = u3nc(u3_nul, u3_nul);
break; break;
} }