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Commit3ce3575

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psql: Add pipeline status to prompt and some state variables
This commit adds %P to psql prompts, able to report the status of apipeline depending on PQpipelineStatus(): on, off or abort.The following variables are added to report the state of an ongoingpipeline:- PIPELINE_SYNC_COUNT: reports the number of piped syncs.- PIPELINE_COMMAND_COUNT: reports the number of piped commands, acommand being either \bind, \bind_named, \close or \parse.- PIPELINE_RESULT_COUNT: reports the results available to read with\getresults.These variables can be used with \echo or in a prompt, using "%:name:"in PROMPT1, PROMPT2 or PROMPT3. Some basic regression tests are addedfor these. The suggestion to use variables to show the details aboutthe status counters comes from me. The original patch proposed was lessextensible, hardcoding the output in the prompt.Author: Anthonin Bonnefoy <anthonin.bonnefoy@datadoghq.com>Discussion:https://postgr.es/m/CAO6_XqroE7JuMEm1sWz55rp9fAYX2JwmcP_3m_v51vnOFdsLiQ@mail.gmail.com
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6 files changed

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6 files changed

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‎doc/src/sgml/ref/psql-ref.sgml

Lines changed: 50 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -3728,6 +3728,12 @@ testdb=&gt; <userinput>\setenv LESS -imx4F</userinput>
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generate one result to get.
37293729
</para>
37303730

3731+
<para>
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When pipeline mode is active, a dedicated prompt variable is available
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to report the pipeline status.
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See <xref linkend="app-psql-prompting-p-uc"/> for more details
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</para>
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37313737
<para>
37323738
Example:
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<programlisting>
@@ -4502,6 +4508,39 @@ bar
45024508
</listitem>
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</varlistentry>
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<varlistentry id="app-psql-variables-pipeline-command-count">
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<term><varname>PIPELINE_COMMAND_COUNT</varname></term>
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<listitem>
4514+
<para>
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The number of commands generated by <literal>\bind</literal>,
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<literal>\bind_named</literal>, <literal>\close</literal> or
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<literal>\parse</literal> queued in an ongoing pipeline.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="app-psql-variables-pipeline-result-count">
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<term><varname>PIPELINE_RESULT_COUNT</varname></term>
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<listitem>
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<para>
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The number of commands of an ongoing pipeline that were followed
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by either a <command>\flushrequest</command> or a
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<command>\syncpipeline</command>, forcing the server to send the
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results. These results can be retrieved with
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<command>\getresults</command>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="app-psql-variables-pipeline-sync-count">
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<term><varname>PIPELINE_SYNC_COUNT</varname></term>
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<listitem>
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<para>
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The number of sync messages queued in an ongoing pipeline.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="app-psql-variables-port">
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<term><varname>PORT</varname></term>
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<listitem>
@@ -4901,6 +4940,17 @@ testdb=&gt; <userinput>INSERT INTO my_table VALUES (:'content');</userinput>
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</listitem>
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</varlistentry>
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<varlistentry id="app-psql-prompting-p-uc">
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<term><literal>%P</literal></term>
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<listitem>
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<para>
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Pipeline status: <literal>off</literal> when not in a pipeline,
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<literal>on</literal> when in an ongoing pipeline or
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<literal>abort</literal> when in an aborted pipeline.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="app-psql-prompting-r">
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<term><literal>%R</literal></term>
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<listitem>

‎src/bin/psql/common.c

Lines changed: 26 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -524,6 +524,26 @@ SetShellResultVariables(int wait_result)
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}
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526526

527+
/*
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* Set special pipeline variables
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* - PIPELINE_SYNC_COUNT: The number of piped syncs
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* - PIPELINE_COMMAND_COUNT: The number of piped commands
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* - PIPELINE_RESULT_COUNT: The number of results available to read
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*/
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staticvoid
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SetPipelineVariables(void)
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{
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charbuf[32];
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snprintf(buf,sizeof(buf),"%d",pset.piped_syncs);
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SetVariable(pset.vars,"PIPELINE_SYNC_COUNT",buf);
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snprintf(buf,sizeof(buf),"%d",pset.piped_commands);
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SetVariable(pset.vars,"PIPELINE_COMMAND_COUNT",buf);
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snprintf(buf,sizeof(buf),"%d",pset.available_results);
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SetVariable(pset.vars,"PIPELINE_RESULT_COUNT",buf);
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}
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527547
/*
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* ClearOrSaveResult
529549
*
@@ -1661,6 +1681,8 @@ ExecQueryAndProcessResults(const char *query,
16611681

16621682
CheckConnection();
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1684+
SetPipelineVariables();
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16641686
return-1;
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}
16661688

@@ -1669,8 +1691,10 @@ ExecQueryAndProcessResults(const char *query,
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{
16701692
/*
16711693
* We are in a pipeline and have not reached the pipeline end, or
1672-
* there was no request to read pipeline results, exit.
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* there was no request to read pipeline results. Update the psql
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* variables tracking the pipeline activity and exit.
16731696
*/
1697+
SetPipelineVariables();
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return1;
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}
16761700

@@ -2105,6 +2129,7 @@ ExecQueryAndProcessResults(const char *query,
21052129
Assert(pset.available_results==0);
21062130
}
21072131
Assert(pset.requested_results==0);
2132+
SetPipelineVariables();
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21092134
/* may need this to recover from conn loss during COPY */
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if (!CheckConnection())

‎src/bin/psql/prompt.c

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -31,6 +31,7 @@
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*sockets, "[local:/dir/name]" if not default
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* %m - like %M, but hostname only (before first dot), or always "[local]"
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* %p - backend pid
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* %P - pipeline status: on, off or abort
3435
* %> - database server port number
3536
* %n - database user name
3637
* %s - service
@@ -181,6 +182,19 @@ get_prompt(promptStatus_t status, ConditionalStack cstack)
181182
snprintf(buf,sizeof(buf),"%d",pid);
182183
}
183184
break;
185+
/* pipeline status */
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case'P':
187+
{
188+
PGpipelineStatusstatus=PQpipelineStatus(pset.db);
189+
190+
if (status==PQ_PIPELINE_ON)
191+
strlcpy(buf,"on",sizeof(buf));
192+
elseif (status==PQ_PIPELINE_ABORTED)
193+
strlcpy(buf,"abort",sizeof(buf));
194+
else
195+
strlcpy(buf,"off",sizeof(buf));
196+
break;
197+
}
184198

185199
case'0':
186200
case'1':

‎src/bin/psql/startup.c

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -205,6 +205,11 @@ main(int argc, char *argv[])
205205
SetVariable(pset.vars,"PROMPT3",DEFAULT_PROMPT3);
206206
SetVariableBool(pset.vars,"SHOW_ALL_RESULTS");
207207

208+
/* Initialize pipeline variables */
209+
SetVariable(pset.vars,"PIPELINE_SYNC_COUNT","0");
210+
SetVariable(pset.vars,"PIPELINE_COMMAND_COUNT","0");
211+
SetVariable(pset.vars,"PIPELINE_RESULT_COUNT","0");
212+
208213
parse_psql_options(argc,argv,&options);
209214

210215
/*

‎src/test/regress/expected/psql_pipeline.out

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -57,12 +57,24 @@ SELECT $1, $2 \bind 'val2' 'val3' \g
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5858
-- Send multiple syncs
5959
\startpipeline
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\echo :PIPELINE_COMMAND_COUNT
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0
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\echo :PIPELINE_SYNC_COUNT
63+
0
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\echo :PIPELINE_RESULT_COUNT
65+
0
6066
SELECT $1 \bind 'val1' \g
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\syncpipeline
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\syncpipeline
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SELECT $1, $2 \bind 'val2' 'val3' \g
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\syncpipeline
6571
SELECT $1, $2 \bind 'val4' 'val5' \g
72+
\echo :PIPELINE_COMMAND_COUNT
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1
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\echo :PIPELINE_SYNC_COUNT
75+
3
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\echo :PIPELINE_RESULT_COUNT
77+
2
6678
\endpipeline
6779
?column?
6880
----------
@@ -303,13 +315,21 @@ SELECT $1 \bind 2 \g
303315
SELECT $1 \bind 1 \g
304316
SELECT $1 \bind 2 \g
305317
SELECT $1 \bind 3 \g
318+
\echo :PIPELINE_SYNC_COUNT
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0
306320
\syncpipeline
321+
\echo :PIPELINE_SYNC_COUNT
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1
323+
\echo :PIPELINE_RESULT_COUNT
324+
3
307325
\getresults 1
308326
?column?
309327
----------
310328
1
311329
(1 row)
312330

331+
\echo :PIPELINE_RESULT_COUNT
332+
2
313333
SELECT $1 \bind 4 \g
314334
\getresults 3
315335
?column?
@@ -322,6 +342,8 @@ SELECT $1 \bind 4 \g
322342
3
323343
(1 row)
324344

345+
\echo :PIPELINE_RESULT_COUNT
346+
0
325347
\endpipeline
326348
?column?
327349
----------

‎src/test/regress/sql/psql_pipeline.sql

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -27,12 +27,18 @@ SELECT $1, $2 \bind 'val2' 'val3' \g
2727

2828
-- Send multiple syncs
2929
\startpipeline
30+
\echo :PIPELINE_COMMAND_COUNT
31+
\echo :PIPELINE_SYNC_COUNT
32+
\echo :PIPELINE_RESULT_COUNT
3033
SELECT $1 \bind'val1' \g
3134
\syncpipeline
3235
\syncpipeline
3336
SELECT $1, $2 \bind'val2''val3' \g
3437
\syncpipeline
3538
SELECT $1, $2 \bind'val4''val5' \g
39+
\echo :PIPELINE_COMMAND_COUNT
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\echo :PIPELINE_SYNC_COUNT
41+
\echo :PIPELINE_RESULT_COUNT
3642
\endpipeline
3743

3844
-- \startpipeline should not have any effect if already in a pipeline.
@@ -174,10 +180,15 @@ SELECT $1 \bind 2 \g
174180
SELECT $1 \bind1 \g
175181
SELECT $1 \bind2 \g
176182
SELECT $1 \bind3 \g
183+
\echo :PIPELINE_SYNC_COUNT
177184
\syncpipeline
185+
\echo :PIPELINE_SYNC_COUNT
186+
\echo :PIPELINE_RESULT_COUNT
178187
\getresults1
188+
\echo :PIPELINE_RESULT_COUNT
179189
SELECT $1 \bind4 \g
180190
\getresults3
191+
\echo :PIPELINE_RESULT_COUNT
181192
\endpipeline
182193

183194
-- \syncpipeline count as one command to fetch for \getresults.

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