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Allow logical decoding via the walsender interface.

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In order for this to work, walsenders need the optional ability to
connect to a database, so the "replication" keyword now allows true
or false, for backward-compatibility, and the new value "database"
(which causes the "dbname" parameter to be respected).

walsender needs to loop not only when idle but also when sending
decoded data to the user and when waiting for more xlog data to decode.
This means that there are now three separate loops inside walsender.c;
although some refactoring has been done here, this is still a bit ugly.

Andres Freund, with contributions from Álvaro Herrera, and further
review by me.
This commit is contained in:
Robert Haas
2014-03-10 13:50:28 -04:00
parent cb9a0c7987
commit 5a991ef869
12 changed files with 915 additions and 167 deletions
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81
src/backend/replication/repl_gram.y
View File

@@ -73,13 +73,17 @@ Node *replication_parse_result;
%token K_WAL
%token K_TIMELINE
%token K_PHYSICAL
%token K_LOGICAL
%token K_SLOT
%type <node> command
%type <node> base_backup start_replication create_replication_slot drop_replication_slot identify_system timeline_history
%type <node> base_backup start_replication start_logical_replication create_replication_slot drop_replication_slot identify_system timeline_history
%type <list> base_backup_opt_list
%type <defelt> base_backup_opt
%type <uintval> opt_timeline
%type <list> plugin_options plugin_opt_list
%type <defelt> plugin_opt_elem
%type <node> plugin_opt_arg
%type <str> opt_slot
%%
@@ -98,6 +102,7 @@ command:
identify_system
| base_backup
| start_replication
| start_logical_replication
| create_replication_slot
| drop_replication_slot
| timeline_history
@@ -165,8 +170,8 @@ base_backup_opt:
}
;
/* CREATE_REPLICATION_SLOT SLOT slot PHYSICAL */
create_replication_slot:
/* CREATE_REPLICATION_SLOT slot PHYSICAL */
K_CREATE_REPLICATION_SLOT IDENT K_PHYSICAL
{
CreateReplicationSlotCmd *cmd;
@@ -175,9 +180,19 @@ create_replication_slot:
cmd->slotname = $2;
$$ = (Node *) cmd;
}
/* CREATE_REPLICATION_SLOT slot LOGICAL plugin */
| K_CREATE_REPLICATION_SLOT IDENT K_LOGICAL IDENT
{
CreateReplicationSlotCmd *cmd;
cmd = makeNode(CreateReplicationSlotCmd);
cmd->kind = REPLICATION_KIND_LOGICAL;
cmd->slotname = $2;
cmd->plugin = $4;
$$ = (Node *) cmd;
}
;
/* DROP_REPLICATION_SLOT SLOT slot */
/* DROP_REPLICATION_SLOT slot */
drop_replication_slot:
K_DROP_REPLICATION_SLOT IDENT
{
@@ -205,19 +220,19 @@ start_replication:
}
;
opt_timeline:
K_TIMELINE UCONST
/* START_REPLICATION SLOT slot LOGICAL %X/%X options */
start_logical_replication:
K_START_REPLICATION K_SLOT IDENT K_LOGICAL RECPTR plugin_options
{
if ($2 <= 0)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
(errmsg("invalid timeline %u", $2))));
$$ = $2;
StartReplicationCmd *cmd;
cmd = makeNode(StartReplicationCmd);
cmd->kind = REPLICATION_KIND_LOGICAL;;
cmd->slotname = $3;
cmd->startpoint = $5;
cmd->options = $6;
$$ = (Node *) cmd;
}
| /* EMPTY */
{ $$ = 0; }
;
/*
* TIMELINE_HISTORY %d
*/
@@ -250,6 +265,46 @@ opt_slot:
{ $$ = NULL; }
;
opt_timeline:
K_TIMELINE UCONST
{
if ($2 <= 0)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
(errmsg("invalid timeline %u", $2))));
$$ = $2;
}
| /* EMPTY */ { $$ = 0; }
;
plugin_options:
'(' plugin_opt_list ')' { $$ = $2; }
| /* EMPTY */ { $$ = NIL; }
;
plugin_opt_list:
plugin_opt_elem
{
$$ = list_make1($1);
}
| plugin_opt_list ',' plugin_opt_elem
{
$$ = lappend($1, $3);
}
;
plugin_opt_elem:
IDENT plugin_opt_arg
{
$$ = makeDefElem($1, $2);
}
;
plugin_opt_arg:
SCONST { $$ = (Node *) makeString($1); }
| /* EMPTY */ { $$ = NULL; }
;
%%
#include "repl_scanner.c"