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3144c33a2f
Specifying this option makes the server not wait for the xlog to be archived, or emit a warning that it can't, instead leaving the responsibility with the client. This is useful when the log is being streamed using the streaming protocol in parallel with the backup, without having log archiving enabled.
171 lines
3.2 KiB
Text
171 lines
3.2 KiB
Text
%{
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/*-------------------------------------------------------------------------
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*
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* repl_scanner.l
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* a lexical scanner for the replication commands
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/replication/repl_scanner.l
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
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#undef fprintf
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#define fprintf(file, fmt, msg) ereport(ERROR, (errmsg_internal("%s", msg)))
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/* Handle to the buffer that the lexer uses internally */
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static YY_BUFFER_STATE scanbufhandle;
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static StringInfoData litbuf;
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static void startlit(void);
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static char *litbufdup(void);
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static void addlit(char *ytext, int yleng);
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static void addlitchar(unsigned char ychar);
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%}
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%option 8bit
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%option never-interactive
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%option nodefault
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%option noinput
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%option nounput
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%option noyywrap
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%option warn
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%option prefix="replication_yy"
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%x xq
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/* Extended quote
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* xqdouble implements embedded quote, ''''
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*/
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xqstart {quote}
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xqdouble {quote}{quote}
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xqinside [^']+
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hexdigit [0-9A-Za-z]+
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quote '
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quotestop {quote}
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%%
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BASE_BACKUP { return K_BASE_BACKUP; }
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FAST { return K_FAST; }
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IDENTIFY_SYSTEM { return K_IDENTIFY_SYSTEM; }
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LABEL { return K_LABEL; }
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NOWAIT { return K_NOWAIT; }
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PROGRESS { return K_PROGRESS; }
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WAL { return K_WAL; }
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START_REPLICATION { return K_START_REPLICATION; }
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"," { return ','; }
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";" { return ';'; }
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[\n] ;
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[\t] ;
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" " ;
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{hexdigit}+\/{hexdigit}+ {
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if (sscanf(yytext, "%X/%X", &yylval.recptr.xlogid, &yylval.recptr.xrecoff) != 2)
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yyerror("invalid streaming start location");
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return RECPTR;
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}
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{xqstart} {
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BEGIN(xq);
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startlit();
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}
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<xq>{quotestop} {
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yyless(1);
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BEGIN(INITIAL);
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yylval.str = litbufdup();
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return SCONST;
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}
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<xq>{xqdouble} {
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addlitchar('\'');
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}
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<xq>{xqinside} {
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addlit(yytext, yyleng);
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}
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<xq><<EOF>> { yyerror("unterminated quoted string"); }
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<<EOF>> {
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yyterminate();
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}
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. {
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("syntax error: unexpected character \"%s\"", yytext)));
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}
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%%
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static void
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startlit(void)
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{
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initStringInfo(&litbuf);
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}
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static char *
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litbufdup(void)
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{
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return litbuf.data;
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}
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static void
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addlit(char *ytext, int yleng)
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{
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appendBinaryStringInfo(&litbuf, ytext, yleng);
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}
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static void
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addlitchar(unsigned char ychar)
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{
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appendStringInfoChar(&litbuf, ychar);
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}
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void
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yyerror(const char *message)
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{
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg_internal("%s", message)));
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}
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void
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replication_scanner_init(const char *str)
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{
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Size slen = strlen(str);
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char *scanbuf;
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/*
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* Might be left over after ereport()
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*/
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if (YY_CURRENT_BUFFER)
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yy_delete_buffer(YY_CURRENT_BUFFER);
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/*
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* Make a scan buffer with special termination needed by flex.
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*/
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scanbuf = (char *) palloc(slen + 2);
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memcpy(scanbuf, str, slen);
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scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
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scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
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}
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void
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replication_scanner_finish()
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{
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yy_delete_buffer(scanbufhandle);
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scanbufhandle = NULL;
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}
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