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slony_logshipper.c
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slony_logshipper.c
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/*-------------------------------------------------------------------------
* slony_logshipper.c
*
* A configuration and admin script utility for Slony-I.
*
* Copyright (c) 2003-2009, PostgreSQL Global Development Group
* Author: Jan Wieck, Afilias USA INC.
*
*
*-------------------------------------------------------------------------
*/
#ifndef WIN32
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/wait.h>
#include <errno.h>
#include <time.h>
#include <signal.h>
#include <dirent.h>
#include <string.h>
#else
#define sleep(x) Sleep(x*1000)
#define vsnprintf _vsnprintf
#endif
#include "libpq-fe.h"
#include "../slonik/types.h"
#include "slony_logshipper.h"
#include "config.h"
typedef struct archscan_entry_s {
char *fname;
struct archscan_entry_s *left;
struct archscan_entry_s *right;
} archscan_entry;
/*
* Global data
*/
int rescan_interval = 0;
int parse_errors = 0;
int opt_quiet = 0;
char *destinationfname = NULL;
FILE *destinationfp = NULL;
char *logfile_path = NULL;
FILE *logfile_fp = NULL;
int max_archives = 1000;
PGconn *dbconn = NULL;
bool logfile_switch_requested = false;
bool wait_for_resume = false;
bool shutdown_smart_requested = false;
bool shutdown_immed_requested = false;
/*
* Configuration data
*/
char *archive_dir = NULL;
char *destination_dir = NULL;
char *destination_conninfo = NULL;
char *cluster_name = NULL;
char *namespace = NULL;
RenameObject *rename_list = NULL;
ProcessingCommand *pre_processing_commands = NULL;
ProcessingCommand *post_processing_commands = NULL;
ProcessingCommand *error_commands = NULL;
/*
* Local commandline options
*/
static int opt_send_logswitch = 0;
static int opt_send_resume = 0;
static int opt_shutdown_smart = 0;
static int opt_shutdown_immed = 0;
static int opt_foreground = 0;
static int opt_cleanup = 0;
static int opt_nowait = 0;
/*
* Local data
*/
static archscan_entry *archscan_sort = NULL;
static char current_at_counter[64];
static bool process_in_transaction = false;
static char *current_archive_path = NULL;
static bool suppress_copy = false;
static SlonDString errlog_messages;
static int archive_count = 0;
/*
* Local functions
*/
static void usage(void);
static int process_archive(char *fname);
static int process_exec_sql(char *sql);
static int archscan(int optind, int argc, char **argv);
static int archscan_sort_in(archscan_entry **entpm, char *fname,
int optind, int argc, char **argv);
static int archscan_sort_out(archscan_entry *ent);
static int get_current_at_counter(void);
static int idents_are_distinct(char *id1, char *id2);
static int process_command(char *command, char *inarchive, char *outarchive);
static void notice_processor(void *arg, const char *msg);
/* ----------
* main
* ----------
*/
int
main(int argc, const char *argv[])
{
FILE *fp;
extern int optind;
int opt;
int init_rc;
int rc;
char archive_path[MSGMAX];
pid_t pid;
dstring_init(&errlog_messages);
logfile_fp = stdout;
/*
* Parse commandline options
*
*/
while ((opt = getopt(argc, (char **)argv, "hvqcflrtTws:")) != EOF)
{
switch (opt)
{
case 'h':
parse_errors++;
break;
case 'v':
printf("slony_logshipper version %s\n", SLONY_I_VERSION_STRING);
exit(0);
break;
case 'q':
opt_quiet = 1;
break;
case 'c':
opt_cleanup = 1;
break;
case 'f':
opt_foreground = 1;
break;
case 'l':
opt_send_logswitch = 1;
break;
case 'r':
opt_send_resume = 1;
break;
case 't':
opt_shutdown_smart = 1;
break;
case 'T':
opt_shutdown_immed = 1;
break;
case 'w':
opt_nowait = 1;
break;
case 's':
rescan_interval = atoi(optarg);
break;
default:
fprintf(stderr, "unknown option '%c'\n", opt);
parse_errors++;
break;
}
}
if (parse_errors || optind >= argc)
usage();
/*
* Parse the config file
*
*/
fp = fopen(argv[optind], "r");
if (fp == NULL)
{
fprintf(stderr, "could not open file '%s'\n", argv[optind]);
return 2;
}
scan_new_input_file(fp);
current_file = (char *)argv[optind++];
scan_push_string("start_config;");
parse_errors += yyparse();
if (parse_errors != 0)
return 1;
/*
* Check that we have an archive dir
*/
if (archive_dir == NULL)
{
fprintf(stderr, "ERROR: no archive dir specified in config file\n");
return 1;
}
if (opt_cleanup)
return ipc_cleanup(archive_dir);
if (opt_send_logswitch)
return ipc_send_logswitch(archive_dir);
if (opt_send_resume)
return ipc_send_resume(archive_dir);
if (opt_shutdown_immed)
return ipc_send_term(archive_dir, true);
if (opt_shutdown_smart)
return ipc_send_term(archive_dir, false);
if (destination_conninfo != NULL && cluster_name == NULL)
{
fprintf(stderr, "no cluster name specified in config file "
"(required for database mode)\n");
return -1;
}
/*
* Configuration and usage are OK. From now on all messages
* go into the logfile, if one is configured.
*/
if (logfile_path != NULL)
{
logfile_fp = fopen(logfile_path, "a");
if (logfile_fp == NULL)
{
fprintf(stderr, "%s: %s\n", logfile_path, strerror(errno));
return -1;
}
}
/*
* Initialize IPC
*/
if ((init_rc = ipc_init(archive_dir)) < 0)
return -1;
/*
* If we are the message queue creator and if we are running in
* database connetion mode, add archives not yet processed to the
* queue.
*/
if (init_rc == 1)
{
if (archscan(optind, argc, (char **)argv) < 0)
return -0;
}
/*
* Put all filenames given to us onto the queue
*/
while (optind < argc)
{
if (ipc_send_path((char *)(argv[optind])) < 0)
{
ipc_finish(true);
return -1;
}
if (!opt_quiet)
errlog(LOG_INFO, "archive %s added to queue\n", argv[optind]);
optind++;
}
if (ipc_unlock() < 0)
return -1;
/*
* If we're not the message queue creator, we're done here.
*/
if (init_rc == 0)
return 0;
/*
* Put ourselves into the background unless -f was given
*/
if (!opt_foreground)
{
switch (pid = fork())
{
case -1: fprintf(stderr, "fork() failed: %s\n",
strerror(errno));
ipc_finish(true);
return -1;
case 0: /*
* This is the child
*/
signal(SIGHUP, SIG_IGN);
close(0);
close(2);
dup2(1, 2);
setsid();
break;
default: if (!opt_quiet)
printf("logshipper daemon created - pid = %d\n",
pid);
return 0;
}
}
/*
* Arrange for program exit when running out of files if -w was given.
*/
if (opt_nowait)
ipc_set_shutdown_smart();
/*
* This is the daemon. Process files as they come in.
*/
while (true)
{
/*
* If we have a bad DB connection, we wait with further processing
* until we can recover it.
*/
if (dbconn != NULL)
{
if (PQstatus(dbconn) != CONNECTION_OK)
while (PQstatus(dbconn) != CONNECTION_OK)
{
errlog(LOG_WARN, "bad database connection, try to recover\n");
PQreset(dbconn);
process_in_transaction = false;
if (PQstatus(dbconn) == CONNECTION_OK)
break;
ipc_poll(true);
if (shutdown_immed_requested)
break;
}
}
if (wait_for_resume)
errlog(LOG_WARN, "waiting for resume\n");
while (wait_for_resume)
{
ipc_poll(true);
if (shutdown_immed_requested)
break;
}
rc = ipc_recv_path(archive_path);
if (rc == 0)
break;
if (rc == -2)
{
archscan_sort = NULL;
errlog(LOG_INFO, "Queue is empty. Going to rescan in %d seconds\n", rescan_interval);
sleep(rescan_interval);
if (archscan(optind, argc, (char **)argv) < 0)
{
return -1;
}
errlog(LOG_INFO, "Archive dir scanned\n");
continue;
}
if (rc < 0)
{
errlog(LOG_ERROR,"ipc_recv_path returned an error:%d\n",rc);
return -1;
}
current_archive_path = archive_path;
if (process_archive(archive_path) != 0)
{
ProcessingCommand *errcmd;
SlonDString cmd;
dstring_terminate(&errlog_messages);
dstring_init(&cmd);
for (errcmd = error_commands; errcmd != NULL; errcmd = errcmd->next)
{
slon_mkquery(&cmd,
"inarchive='%q'; outarchive=''; errortext='%q'; %s",
archive_path, dstring_data(&errlog_messages),
errcmd->command);
system(dstring_data(&cmd));
}
dstring_free(&cmd);
/*
* If it left a transaction in progress, roll it back.
*/
if (process_in_transaction)
{
process_end_transaction("rollback;");
}
/*
* Stop everything if we are in nowait mode anyway
*/
if (opt_nowait)
{
if (dbconn != NULL)
PQfinish(dbconn);
ipc_finish(true);
return -1;
}
/*
* Reinsert the logfile into the processing queue.
*/
if (ipc_send_path(archive_path) < 0)
return -1;
if (dbconn != NULL)
{
if (PQstatus(dbconn) == CONNECTION_OK)
{
/*
* this must have failed due to a parse error or
* something went wrong with one of the queries.
* Wait for resume command.
*/
wait_for_resume = true;
}
}
else
{
/*
* If we don't even have a DB connection, this
* can only be a parse error or something similar.
* Wait for resume command.
*/
wait_for_resume = true;
}
}
else
{
/*
* Every time we process one archive successfully, we
* reset the errlog message collection.
*/
dstring_reset(&errlog_messages);
}
current_archive_path = NULL;
}
return 0;
}
static int
process_archive(char *fname)
{
SlonDString destfname;
char *cp;
FILE *fp;
ProcessingCommand *cmd;
errlog(LOG_INFO, "Processing archive file %s\n", fname);
archive_count++;
if (archive_count >= max_archives)
ipc_set_shutdown_smart();
fp = fopen(fname, "r");
if (fp == NULL)
{
errlog(LOG_ERROR, "cannot open %s - %s\n", fname, strerror(errno));
return -1;
}
if (destination_dir != NULL)
{
cp = strrchr(fname, '/');
if (cp == NULL)
cp = fname;
else
cp++;
dstring_init(&destfname);
dstring_append(&destfname, destination_dir);
dstring_addchar(&destfname, '/');
dstring_append(&destfname, cp);
dstring_terminate(&destfname);
destinationfname = dstring_data(&destfname);
}
for (cmd = pre_processing_commands; cmd != NULL; cmd = cmd->next)
{
if (process_command(cmd->command, fname, destinationfname) < 0)
{
fclose(fp);
if (destinationfname != NULL)
{
destinationfname = NULL;
dstring_free(&destfname);
}
return -1;
}
}
if (destinationfname != NULL)
{
destinationfp = fopen(destinationfname, "w");
if (destinationfp == NULL)
{
errlog(LOG_ERROR, "cannot open %s - %s\n",
dstring_data(&destfname), strerror(errno));
fclose(fp);
dstring_free(&destfname);
return 1;
}
}
scan_new_input_file(fp);
current_file = fname;
scan_push_string("start_archive;");
parse_errors = 0;
parse_errors += yyparse();
fclose(fp);
if (destinationfname != NULL)
{
fclose(destinationfp);
destinationfp = NULL;
if (parse_errors != 0)
unlink(destinationfname);
}
if (parse_errors == 0)
{
for (cmd = post_processing_commands; cmd != NULL; cmd = cmd->next)
{
if (process_command(cmd->command, fname, destinationfname) < 0)
{
parse_errors++;
break;
}
}
}
if (destinationfname != NULL)
{
destinationfname = NULL;
dstring_free(&destfname);
}
return parse_errors;
}
static int
process_exec_sql(char *sql)
{
/*
* If we have a database connection, throw the query over to there.
*/
if (dbconn != NULL)
{
PGresult *res;
res = PQexec(dbconn, sql);
if (PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK &&
PQresultStatus(res) != PGRES_EMPTY_QUERY)
{
errlog(LOG_ERROR, "%s: %sQuery was: %s\n",
PQresStatus(PQresultStatus(res)),
PQresultErrorMessage(res), sql);
PQclear(res);
return -1;
}
PQclear(res);
}
if (destinationfp != NULL)
{
if (fputs(sql, destinationfp) == EOF)
{
errlog(LOG_ERROR, "%s: %s\n", destinationfname, strerror(errno));
return -1;
}
if (fputc('\n', destinationfp) == EOF)
{
errlog(LOG_ERROR, "%s: %s\n", destinationfname, strerror(errno));
return -1;
}
}
return 0;
}
int
process_check_at_counter(char *at_counter)
{
char buf1[64];
char buf2[64];
size_t i;
if (destination_conninfo == NULL)
return 0;
if (strlen(at_counter) > 20)
{
errlog(LOG_ERROR, "at_counter %s too long in process_check_at_counter\n",
at_counter);
return -1;
}
if (get_current_at_counter() < 0)
return -1;
for (i = 0; i < (20 - strlen(current_at_counter)); i++)
buf1[i] = '0';
strcpy(&buf1[i], current_at_counter);
for (i = 0; i < (20 - strlen(at_counter)); i++)
buf2[i] = '0';
strcpy(&buf2[i], at_counter);
if (strcmp(buf2, buf1) <= 0)
{
errlog(LOG_WARN, "skip archive with counter %s - already applied\n",
at_counter);
if (process_in_transaction)
process_end_transaction("rollback;");
return 1;
}
return 0;
}
int
process_simple_sql(char *sql)
{
return process_exec_sql(sql);
}
int
process_insert(InsertStmt *stmt)
{
SlonDString ds;
char *glue;
AttElem *elem;
int rc;
char *namespace;
char *tablename;
if (lookup_rename(stmt->namespace, stmt->tablename,
&namespace, &tablename) == 0)
return 0;
dstring_init(&ds);
slon_mkquery(&ds, "insert into %s.%s ", namespace, tablename);
glue = "(";
for (elem = stmt->attributes->list_head; elem != NULL; elem = elem->next)
{
slon_appendquery(&ds, "%s%s", glue, elem->attname);
glue = ", ";
}
slon_appendquery(&ds, ") values ");
glue = "(";
for (elem = stmt->attributes->list_head; elem != NULL; elem = elem->next)
{
if (elem->attvalue == NULL)
slon_appendquery(&ds, "%sNULL", glue);
else
slon_appendquery(&ds, "%s'%s'", glue, elem->attvalue);
glue = ", ";
}
dstring_addchar(&ds, ')');
dstring_addchar(&ds, ';');
dstring_terminate(&ds);
rc = process_exec_sql(dstring_data(&ds));
dstring_free(&ds);
return rc;
}
int
process_update(UpdateStmt *stmt)
{
SlonDString ds;
char *glue;
AttElem *elem;
int rc;
char *namespace;
char *tablename;
if (lookup_rename(stmt->namespace, stmt->tablename,
&namespace, &tablename) == 0)
return 0;
dstring_init(&ds);
slon_mkquery(&ds, "update only %s.%s ", namespace, tablename);
glue = "set";
for (elem = stmt->changes->list_head; elem != NULL; elem = elem->next)
{
if (elem->attvalue == NULL)
slon_appendquery(&ds, "%s %s=NULL", glue,
elem->attname);
else
slon_appendquery(&ds, "%s %s='%s'", glue,
elem->attname, elem->attvalue);
glue = ",";
}
glue = " where";
for (elem = stmt->qualification->list_head; elem != NULL; elem = elem->next)
{
if (elem->attvalue == NULL)
slon_appendquery(&ds, "%s %s IS NULL", glue,
elem->attname);
else
slon_appendquery(&ds, "%s %s='%s'", glue,
elem->attname, elem->attvalue);
glue = " and";
}
dstring_addchar(&ds, ';');
dstring_terminate(&ds);
rc = process_exec_sql(dstring_data(&ds));
dstring_free(&ds);
return rc;
}
int
process_delete(DeleteStmt *stmt)
{
SlonDString ds;
char *glue;
AttElem *elem;
int rc;
char *namespace;
char *tablename;
if (lookup_rename(stmt->namespace, stmt->tablename,
&namespace, &tablename) == 0)
return 0;
dstring_init(&ds);
slon_mkquery(&ds, "delete from %s%s.%s",
(stmt->only) ? "only " : "", namespace, tablename);
if (stmt->qualification != NULL)
{
glue = " where";
for (elem = stmt->qualification->list_head; elem != NULL; elem = elem->next)
{
if (elem->attvalue == NULL)
slon_appendquery(&ds, "%s %s IS NULL", glue,
elem->attname);
else
slon_appendquery(&ds, "%s %s='%s'", glue,
elem->attname, elem->attvalue);
glue = " and";
}
}
dstring_addchar(&ds, ';');
dstring_terminate(&ds);
rc = process_exec_sql(dstring_data(&ds));
dstring_free(&ds);
return rc;
}
int
process_copy(CopyStmt *stmt)
{
SlonDString ds;
char *glue;
AttElem *elem;
PGresult *res;
char *namespace;
char *tablename;
if (lookup_rename(stmt->namespace, stmt->tablename,
&namespace, &tablename) == 0)
{
suppress_copy = true;
scan_copy_start();
return 0;
}
suppress_copy = false;
dstring_init(&ds);
slon_mkquery(&ds, "copy %s.%s ", namespace, tablename);
glue = "(";
for (elem = stmt->attributes->list_head; elem != NULL; elem = elem->next)
{
slon_appendquery(&ds, "%s%s", glue, elem->attname);
glue = ", ";
}
slon_appendquery(&ds, ") from %s;", stmt->from);
if (dbconn != NULL)
{
res = PQexec(dbconn, dstring_data(&ds));
if (PQresultStatus(res) != PGRES_COPY_IN)
{
errlog(LOG_ERROR, "%s: %sQuery was: %s\n",
PQresStatus(PQresultStatus(res)),
PQresultErrorMessage(res), dstring_data(&ds));
PQclear(res);
dstring_free(&ds);
return -1;
}
}
if (destinationfp != NULL)
{
if (fputs(dstring_data(&ds), destinationfp) == EOF)
{
errlog(LOG_ERROR, "%s: %s\n", destinationfname, strerror(errno));
dstring_free(&ds);
return -1;
}
if (fputc('\n', destinationfp) == EOF)
{
errlog(LOG_ERROR, "%s: %s\n", destinationfname, strerror(errno));
return -1;
}
}
dstring_free(&ds);
scan_copy_start();
return 0;
}
int
process_copydata(char *line)
{
PGresult *res;
if (suppress_copy)
return 0;
if (dbconn != NULL)
{
#ifdef HAVE_PQPUTCOPYDATA
if (PQputCopyData(dbconn, line, strlen(line)) != 1)
{
errlog(LOG_ERROR, "%s", PQerrorMessage(dbconn));
PQputCopyEnd(dbconn, "Offline copy_set failed");
res = PQgetResult(dbconn);
if (res != NULL)
PQclear(res);
return -1;
}
#else
if (PQputline(dbconn, line) != 0)
{
errlog(LOG_ERROR, "%s", PQerrorMessage(dbconn));
PQendcopy(dbconn);
return -1;
}
#endif
}
if (destinationfp != NULL)
{
if (fputs(line, destinationfp) == EOF)
{
errlog(LOG_ERROR, "%s: %s\n", destinationfname, strerror(errno));
return -1;
}
}
return 0;
}
int
process_copyend(void)
{
if (suppress_copy)
return 0;
if (dbconn != NULL)
{
#ifdef HAVE_PQPUTCOPYDATA
PGresult *res;
if (PQputCopyEnd(dbconn, NULL) != 1)
{
errlog(LOG_ERROR, "%s", PQerrorMessage(dbconn));
return -1;
}
res = PQgetResult(dbconn);
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
errlog(LOG_ERROR, "%s: %s",
PQresStatus(PQresultStatus(res)),
PQresultErrorMessage(res));
PQclear(res);
return -1;
}
PQclear(res);
#else
if (PQputline(dbconn, "\\.\n") != 0)
{
errlog(LOG_ERROR, "%s", PQerrorMessage(dbconn));
PQendcopy(dbconn);
return -1;
}
if (PQendcopy(dbconn) != 0)
{
errlog(LOG_ERROR, "%s", PQerrorMessage(dbconn));
return -1;
}
#endif
}
if (destinationfp != NULL)
{
if (fputs("\\.\n", destinationfp) == EOF)
{
errlog(LOG_ERROR, "%s: %s\n", destinationfname, strerror(errno));
return -1;
}
}
return 0;
}
int
process_start_transaction(char *sql)
{
if (process_in_transaction)
{
errlog(LOG_ERROR, "already inside a transaction\n");
return -1;
}
process_in_transaction = true;
return process_exec_sql(sql);
}
int
process_end_transaction(char *sql)
{
if (!process_in_transaction)
{
errlog(LOG_ERROR, "not inside a transaction\n");
return -1;
}
process_in_transaction = false;
return process_exec_sql(sql);
}
static int
process_command(char *command, char *inarchive, char *outarchive)
{
int status;
int errorignore = 0;
SlonDString cmd;
if (*command == '@')
{
errorignore = 1;