Обсуждение: Someone's broken psql's connection-failure error reporting
In CVS tip, I'm getting only an empty string from psql where it should
print connection-failure messages.
psql 7.3 does this:
$ psql -p 5555
psql: could not connect to server: No such file or directory Is the server running locally and accepting
connectionson Unix domain socket "/tmp/.s.PGSQL.5555"?
$
CVS tip does this:
$ psql -p 5555
psql: $
Have not dug to see if this is the fault of libpq or psql; but there's
been a fair amount of hacking lately in libpq's connection handling ...
regards, tom lane
Tom Lane wrote: > In CVS tip, I'm getting only an empty string from psql where it should > print connection-failure messages. > > psql 7.3 does this: > > $ psql -p 5555 > psql: could not connect to server: No such file or directory > Is the server running locally and accepting > connections on Unix domain socket "/tmp/.s.PGSQL.5555"? > $ > > CVS tip does this: > > $ psql -p 5555 > psql: $ > > Have not dug to see if this is the fault of libpq or psql; but there's > been a fair amount of hacking lately in libpq's connection handling ... I just tried and got an error: $ psql -p 5555psql: could not create socket: No such file or directory This is as of last night's CVS. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania19073
Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom Lane wrote:
>> In CVS tip, I'm getting only an empty string from psql where it should
>> print connection-failure messages.
> [ it works here ]
Speculation time: do you have the IPv6 code compiled in? I don't.
regards, tom lane
Tom Lane wrote: > Bruce Momjian <pgman@candle.pha.pa.us> writes: > > Tom Lane wrote: > >> In CVS tip, I'm getting only an empty string from psql where it should > >> print connection-failure messages. > > > [ it works here ] > > Speculation time: do you have the IPv6 code compiled in? I don't. I have IPv6 enabled in the binary, but not the kernel. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania19073
Hi All, I was wondering if there is a libq or libqxx type library written in java. Even if it is done through jni. I would like to do some experiments, perhaps make a utility that reads server information such as currently executing query, current locks, amount of disk/ram taken up by pgsql. Basically some very useful information for admins. I've forgotten most of C, C++ (from college days), but would love to try my hand at such a utility...I'm sure there are others who would like to use java to access such a backend. Any pointers? Shahbaz C.
Well, we have jdbc at jdbc.postgresql.org. --------------------------------------------------------------------------- Shahbaz Chaudhary wrote: > Hi All, > I was wondering if there is a libq or libqxx type library written in > java. Even if it is done through jni. I would like to do some > experiments, perhaps make a utility that reads server information such > as currently executing query, current locks, amount of disk/ram taken up > by pgsql. Basically some very useful information for admins. I've > forgotten most of C, C++ (from college days), but would love to try my > hand at such a utility...I'm sure there are others who would like to use > java to access such a backend. Any pointers? > > Shahbaz C. > > > ---------------------------(end of broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://archives.postgresql.org > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania19073
Sorry, I don't think I made myself clear. I don't want to query the DB every few seconds to get its current status. I want to keep an open an open connection and have immediate access to all information like I have when I set the debug level high and see everything going on inside the DB right on my machine. I guess think of it as a dashboard that constantly displays the db status. Something like 'top' rather than 'ps -ef|grep .....'. As far as I understand, JDBC is just a mechanism to connect to a db, execute queries, etc., not get this kind of info. Shahbaz C. -----Original Message----- From: pgsql-hackers-owner@postgresql.org [mailto:pgsql-hackers-owner@postgresql.org] On Behalf Of Bruce Momjian Sent: Thursday, February 13, 2003 7:18 PM To: Shahbaz Chaudhary Cc: pgsql-hackers@postgresql.org Subject: Re: [HACKERS] java access to the backend (non jdbc)? Well, we have jdbc at jdbc.postgresql.org. ------------------------------------------------------------------------ --- Shahbaz Chaudhary wrote: > Hi All, > I was wondering if there is a libq or libqxx type library written in > java. Even if it is done through jni. I would like to do some > experiments, perhaps make a utility that reads server information such > as currently executing query, current locks, amount of disk/ram taken up > by pgsql. Basically some very useful information for admins. I've > forgotten most of C, C++ (from college days), but would love to try my > hand at such a utility...I'm sure there are others who would like to use > java to access such a backend. Any pointers? > > Shahbaz C. > > > ---------------------------(end of broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://archives.postgresql.org > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
Well, I wrote pgmonitor on gborg.postgresql.org, which is like top for PostgreSQL, but is in TCL. It uses ps internally. --------------------------------------------------------------------------- Shahbaz Chaudhary wrote: > Sorry, I don't think I made myself clear. I don't want to query the DB > every few seconds to get its current status. I want to keep an open an > open connection and have immediate access to all information like I have > when I set the debug level high and see everything going on inside the > DB right on my machine. > > I guess think of it as a dashboard that constantly displays the db > status. Something like 'top' rather than 'ps -ef|grep .....'. > > As far as I understand, JDBC is just a mechanism to connect to a db, > execute queries, etc., not get this kind of info. > > Shahbaz C. > > -----Original Message----- > From: pgsql-hackers-owner@postgresql.org > [mailto:pgsql-hackers-owner@postgresql.org] On Behalf Of Bruce Momjian > Sent: Thursday, February 13, 2003 7:18 PM > To: Shahbaz Chaudhary > Cc: pgsql-hackers@postgresql.org > Subject: Re: [HACKERS] java access to the backend (non jdbc)? > > > Well, we have jdbc at jdbc.postgresql.org. > > ------------------------------------------------------------------------ > --- > > Shahbaz Chaudhary wrote: > > Hi All, > > I was wondering if there is a libq or libqxx type library written in > > java. Even if it is done through jni. I would like to do some > > experiments, perhaps make a utility that reads server information such > > as currently executing query, current locks, amount of disk/ram taken > up > > by pgsql. Basically some very useful information for admins. I've > > forgotten most of C, C++ (from college days), but would love to try my > > hand at such a utility...I'm sure there are others who would like to > use > > java to access such a backend. Any pointers? > > > > Shahbaz C. > > > > > > ---------------------------(end of > broadcast)--------------------------- > > TIP 6: Have you searched our list archives? > > > > http://archives.postgresql.org > > > > -- > Bruce Momjian | http://candle.pha.pa.us > pgman@candle.pha.pa.us | (610) 359-1001 > + If your life is a hard drive, | 13 Roberts Road > + Christ can be your backup. | Newtown Square, Pennsylvania > 19073 > > ---------------------------(end of broadcast)--------------------------- > TIP 6: Have you searched our list archives? > > http://archives.postgresql.org > > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania19073
Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom Lane wrote:
>> Speculation time: do you have the IPv6 code compiled in? I don't.
> I have IPv6 enabled in the binary, but not the kernel.
Sure enough, the IPV6 patch had broken error handling in the non-IPV6
path.
I've done a little bit of cleanup, but that code is still a mess...
someone should rewrite these routines.
regards, tom lane
Tom Lane wrote: > Bruce Momjian <pgman@candle.pha.pa.us> writes: > > Tom Lane wrote: > >> Speculation time: do you have the IPv6 code compiled in? I don't. > > > I have IPv6 enabled in the binary, but not the kernel. > > Sure enough, the IPV6 patch had broken error handling in the non-IPV6 > path. > > I've done a little bit of cleanup, but that code is still a mess... > someone should rewrite these routines. Yes, I looked at it and struggled to get both IPv4 and IPv6 cleanly working. Any ideas on how to improve it? -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001+ If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania19073
Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom Lane wrote:
>> I've done a little bit of cleanup, but that code is still a mess...
>> someone should rewrite these routines.
> Yes, I looked at it and struggled to get both IPv4 and IPv6 cleanly
> working. Any ideas on how to improve it?
The major problem is the huge amount of #ifdefs, most of which seem to
come from the fact that we deal with a list of possible addresses in
one case and not the other. It would help a lot if we fixed things so
that we dealt with a list in either case --- only a one-element list,
if we don't have getaddrinfo, but getaddrinfo2 could hide that and
provide a uniform API regardless.
The SSL patch is contributing a lot of ugliness too. It would be more
functional as well as cleaner if someone rewrote that code to work in
non-blocking style (which AFAICT should be feasible with the openssl
API, it just wasn't done).
regards, tom lane
On Thu, Feb 13, 2003 at 08:55:23PM -0500, Tom Lane wrote: > Bruce Momjian <pgman@candle.pha.pa.us> writes: > > Tom Lane wrote: > >> I've done a little bit of cleanup, but that code is still a mess... > >> someone should rewrite these routines. > > > Yes, I looked at it and struggled to get both IPv4 and IPv6 cleanly > > working. Any ideas on how to improve it? > > The major problem is the huge amount of #ifdefs, most of which seem to > come from the fact that we deal with a list of possible addresses in > one case and not the other. It would help a lot if we fixed things so > that we dealt with a list in either case --- only a one-element list, > if we don't have getaddrinfo, but getaddrinfo2 could hide that and > provide a uniform API regardless. I'm actually working on getting rid of all those #ifdef's, but it's going slowly. (I have very little free time.) Kurt