From 0b728575358645f6e9a3f98959dd6995325f7380 Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <esmil@mailme.dk>
Date: Wed, 2 Mar 2011 23:18:34 +0100
Subject: initial commit
---
.gitignore | 5 +
LICENSE | 674 ++++++++++++++++++++++++++++++++++++
Makefile | 52 +++
PKGBUILD | 25 ++
README.markdown | 158 +++++++++
lem/postgres.so | 1 +
lem/postgres/queued.lua | 1 +
postgres.c | 884 ++++++++++++++++++++++++++++++++++++++++++++++++
qtest.lua | 114 +++++++
queued.lua | 96 ++++++
test.lua | 98 ++++++
11 files changed, 2108 insertions(+)
create mode 100644 .gitignore
create mode 100644 LICENSE
create mode 100644 Makefile
create mode 100644 PKGBUILD
create mode 100644 README.markdown
create mode 120000 lem/postgres.so
create mode 120000 lem/postgres/queued.lua
create mode 100644 postgres.c
create mode 100755 qtest.lua
create mode 100644 queued.lua
create mode 100755 test.lua
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..dcb167a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.o
+*.so
+*.pkg.tar.*
+src/
+pkg/
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
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+ THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ca0b6b5
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,52 @@
+CC = gcc
+CFLAGS ?= -O2 -pipe -Wall -Wextra -Wno-variadic-macros -Wno-strict-aliasing -I$(shell pg_config --includedir)
+LDFLAGS ?= -L$(shell pg_config --libdir)
+STRIP = strip
+INSTALL = install
+
+LUA_VERSION = 5.1
+PREFIX = /usr/local
+LIBDIR = $(PREFIX)/lib/lua/$(LUA_VERSION)/lem
+
+programs = postgres.so
+scripts = queued.lua
+
+ifdef NDEBUG
+DEFINES+=-DNDEBUG
+endif
+
+.PHONY: all strip install indent clean
+.PRECIOUS: %.o
+
+all: $(programs)
+
+%.o: %.c
+ @echo ' CC $@'
+ @$(CC) $(CFLAGS) -I$(PREFIX)/include -fPIC -nostartfiles $(DEFINES) -c $< -o $@
+
+%.so: %.o
+ @echo ' LD $@'
+ @$(CC) -shared -lpq $(LDFLAGS) $^ -o $@
+
+%-strip: %
+ @echo ' STRIP $<'
+ @$(STRIP) $<
+
+strip: $(programs:%=%-strip)
+
+libdir-install:
+ @echo " INSTALL -d $(LIBDIR)"
+ @$(INSTALL) -d $(DESTDIR)$(LIBDIR)/postgres
+
+%.lua-install: %.lua libdir-install
+ @echo " INSTALL $<"
+ @$(INSTALL) $< $(DESTDIR)$(LIBDIR)/postgres/$<
+
+%.so-install: %.so libdir-install
+ @echo " INSTALL $<"
+ @$(INSTALL) $< $(DESTDIR)$(LIBDIR)/$<
+
+install: $(programs:%=%-install) $(scripts:%=%-install)
+
+clean:
+ rm -f $(programs) *.o *.c~ *.h~
diff --git a/PKGBUILD b/PKGBUILD
new file mode 100644
index 0000000..43a0238
--- /dev/null
+++ b/PKGBUILD
@@ -0,0 +1,25 @@
+# Maintainer: Emil Renner Berthing <esmil@mailme.dk>
+
+pkgname=lem-postgres
+pkgver=0.1
+pkgrel=1
+pkgdesc="PostgreSQL library for the Lua Event Machine"
+arch=('i686' 'x86_64' 'armv5tel' 'armv7l')
+url="https://github.com/esmil/lem-postgres"
+license=('GPL')
+depends=('lem' 'postgresql-libs')
+source=()
+
+build() {
+ cd "$startdir"
+
+ make NDEBUG=1
+}
+
+package() {
+ cd "$startdir"
+
+ make DESTDIR="$pkgdir/" PREFIX='/usr' install
+}
+
+# vim:set ts=2 sw=2 et:
diff --git a/README.markdown b/README.markdown
new file mode 100644
index 0000000..3640704
--- /dev/null
+++ b/README.markdown
@@ -0,0 +1,158 @@
+lem-postgres
+============
+
+
+About
+-----
+
+lem-postgres is a [PostgreSQL][] library for the [Lua Event Machine][lem].
+It allows you to query PostgreSQL databases without blocking
+other coroutines.
+
+[lem]: https://github.com/esmil/lem
+[postgresql]: http://www.postgresql.org/
+
+Installation
+------------
+
+Get the source and do
+
+ make
+ make install
+
+This installs the library under `/usr/local/lib/lua/5.1/`.
+Use
+
+ make PREFIX=<your custom path> install
+
+to install to `<your custom path>/lib/lua/5.1/`.
+
+
+Usage
+-----
+
+Import the module using something like
+
+ local postgres = require 'lem.postgres'
+
+This sets `postgres` to a table with a single function.
+
+* __postgres.connect(conninfo)__
+
+ Connect to the database given by parameters in the `conninfo` string.
+ Returns a new database connection object on success,
+ or otherwise `nil` followed by an error message.
+
+The metatable of database connection objects can be found under
+__postgres.Connection__.
+
+Database connection objects has the following methods.
+
+* __db:close()__
+
+ Close the database connection.
+
+ Returns `true` on success or otherwise `nil, 'already closed'`,
+ if the connection was already closed.
+
+* __db:reset()__
+
+ Reset the database connection.
+
+ Returns `true` on success or otherwise `nil` followed by an error message.
+ If another coroutine is using this database connection the error message
+ will be `'busy'`.
+ If the connection is closed the error message will be `'closed'`.
+ If another coroutine closes this connection while the reset is going on
+ the error message be `'interrupted'`.
+
+* __db:exec(query, ...)__
+
+ Execute an SQL query. If the query string is parametized
+ (using $1, $2 etc.) the parameters must be given after the
+ query string.
+
+ If the query is a SELECT the result will be returned in a Lua table
+ with entries 1, 2, ... for each row.
+ Each row is again a Lua table with entries 1, 2, ... for each
+ returned column.
+
+ Returns `true` or the result of the SELECT statement on success,
+ or otherwise `nil` followed by an error message.
+ If another coroutine is using this database connection the error message
+ will be `'busy'`.
+ If the connection is closed the error message will be `'closed'`.
+ If another coroutine closes this connection while the reset is going on
+ the error message be `'interrupted'`.
+
+* __db:prepare(name, query)__
+
+ Creates a prepared SQL statement under the given name.
+
+ Returns `true` on success or otherwise `nil` followed by an error message.
+ If another coroutine is using this database connection the error message
+ will be `'busy'`.
+ If the connection is closed the error message will be `'closed'`.
+ If another coroutine closes this connection while the reset is going on
+ the error message be `'interrupted'`.
+
+* __db:run(name, ...)__
+
+ Runs the prepared statement given by the name. If the statement
+ is parameterized (using $1, $2 etc.) the parameters must be given
+ after the name of the statement.
+
+ If the prepared statement is a SELECT the result will be returned in
+ a Lua table with entries 1, 2, ... for each row.
+ Each row is again a Lua table with entries 1, 2, ... for each
+ returned column.
+
+ Returns `true` or the result of the SELECT statement on success,
+ or otherwise `nil` followed by an error message.
+ If another coroutine is using this database connection the error message
+ will be `'busy'`.
+ If the connection is closed the error message will be `'closed'`.
+ If another coroutine closes this connection while the reset is going on
+ the error message be `'interrupted'`.
+
+* __db:put(line)__
+
+ This method should be called after a `COPY <table> FROM STDIN`-query.
+ Call it once for each row in the table.
+
+ Returns `true` on success or otherwise `nil` followed by an error message.
+
+* __db:done([error])__
+
+ When all rows of a `COPY <table> FROM STDIN`-query have been sent to the
+ server, call this method to signal end of transmission.
+
+ If an error message is supplied this will signal an error to the server.
+
+ Returns `true` on success or otherwise `nil` followed by an error message.
+ Calling this method with an error argument will also cause it to return
+ `nil` followed by an error message.
+
+* __db:get()__
+
+ Call this method to receive rows after a `COPY <table> TO STDIN`-query.
+
+ Returns one complete line as a Lua string or `true` to signal end of
+ transmission.
+ On error `nil` followed by an error message will be returned.
+
+
+License
+-------
+
+lem-postgres is free software. It is distributed under the terms of the
+[GNU General Public License][gpl].
+
+[gpl]: http://www.fsf.org/licensing/licenses/gpl.html
+
+
+Contact
+-------
+
+Please send bug reports, patches, feature requests, praise and general gossip
+to me, Emil Renner Berthing <esmil@mailme.dk>.
diff --git a/lem/postgres.so b/lem/postgres.so
new file mode 120000
index 0000000..d0ce981
--- /dev/null
+++ b/lem/postgres.so
@@ -0,0 +1 @@
+../postgres.so
\ No newline at end of file
diff --git a/lem/postgres/queued.lua b/lem/postgres/queued.lua
new file mode 120000
index 0000000..94dfe13
--- /dev/null
+++ b/lem/postgres/queued.lua
@@ -0,0 +1 @@
+../../queued.lua
\ No newline at end of file
diff --git a/postgres.c b/postgres.c
new file mode 100644
index 0000000..16f2de8
--- /dev/null
+++ b/postgres.c
@@ -0,0 +1,884 @@
+/*
+ * This file is part of lem-postgres.
+ * Copyright 2011 Emil Renner Berthing
+ *
+ * lem-postgres is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * lem-postgres is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with lem-postgres. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <assert.h>
+#include <lem.h>
+#include <libpq-fe.h>
+
+struct connection {
+ struct ev_io w;
+ PGconn *conn;
+ lua_State *T;
+};
+
+static void
+push_error(lua_State *T, PGconn *conn)
+{
+ const char *msg = PQerrorMessage(conn);
+ const char *p;
+
+ for (p = msg; *p != '\n' && *p != '\0'; p++);
+
+ lua_pushnil(T);
+ if (p > msg)
+ lua_pushlstring(T, msg, p - msg);
+ else
+ lua_pushliteral(T, "unknown error");
+}
+
+static int
+connection_gc(lua_State *T)
+{
+ struct connection *c = lua_touserdata(T, 1);
+
+ if (c->conn == NULL)
+ return 0;
+
+ ev_io_stop(EV_G_ &c->w);
+ PQfinish(c->conn);
+ return 0;
+}
+
+static int
+connection_close(lua_State *T)
+{
+ struct connection *c;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ c = lua_touserdata(T, 1);
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "already closed");
+ return 2;
+ }
+
+ if (c->T != NULL) {
+ lua_pushnil(c->T);
+ lua_pushliteral(c->T, "interrupted");
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ }
+
+ ev_io_stop(EV_G_ &c->w);
+ PQfinish(c->conn);
+ c->conn = NULL;
+
+ lua_pushboolean(T, 1);
+ return 1;
+}
+
+static void
+connect_handler(EV_P_ struct ev_io *w, int revents)
+{
+ struct connection *c = (struct connection *)w;
+
+ (void)revents;
+
+ ev_io_stop(EV_A_ &c->w);
+ switch (PQconnectPoll(c->conn)) {
+ case PGRES_POLLING_READING:
+ lem_debug("PGRES_POLLING_READING, socket = %d", PQsocket(c->conn));
+ ev_io_set(&c->w, PQsocket(c->conn), EV_READ);
+ break;
+
+ case PGRES_POLLING_WRITING:
+ lem_debug("PGRES_POLLING_WRITING, socket = %d", PQsocket(c->conn));
+ ev_io_set(&c->w, PQsocket(c->conn), EV_WRITE);
+ break;
+
+ case PGRES_POLLING_FAILED:
+ lem_debug("PGRES_POLLING_FAILED");
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ PQfinish(c->conn);
+ c->conn = NULL;
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ return;
+
+ case PGRES_POLLING_OK:
+ lem_debug("PGRES_POLLING_OK");
+ lem_queue(c->T, 1);
+ c->T = NULL;
+ return;
+
+#ifndef NDEBUG
+ case PGRES_POLLING_ACTIVE:
+ assert(0);
+#endif
+ }
+
+ ev_io_start(EV_A_ &c->w);
+}
+
+static int
+connection_connect(lua_State *T)
+{
+ const char *conninfo = luaL_checkstring(T, 1);
+ PGconn *conn;
+ ConnStatusType status;
+ struct connection *c;
+
+ conn = PQconnectStart(conninfo);
+ if (conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "out of memory");
+ return 2;
+ }
+
+ status = PQstatus(conn);
+ if (status == CONNECTION_BAD) {
+ lem_debug("CONNECTION_BAD");
+ goto error;
+ }
+
+ c = lua_newuserdata(T, sizeof(struct connection));
+ lua_pushvalue(T, lua_upvalueindex(1));
+ lua_setmetatable(T, -2);
+
+ c->conn = conn;
+
+ switch (PQconnectPoll(conn)) {
+ case PGRES_POLLING_READING:
+ lem_debug("PGRES_POLLING_READING");
+ ev_io_init(&c->w, connect_handler, PQsocket(conn), EV_READ);
+ break;
+
+ case PGRES_POLLING_WRITING:
+ lem_debug("PGRES_POLLING_WRITING");
+ ev_io_init(&c->w, connect_handler, PQsocket(conn), EV_WRITE);
+ break;
+
+ case PGRES_POLLING_FAILED:
+ lem_debug("PGRES_POLLING_FAILED");
+ goto error;
+
+ case PGRES_POLLING_OK:
+ lem_debug("PGRES_POLLING_OK");
+ c->T = NULL;
+ return 1;
+
+#ifndef NDEBUG
+ case PGRES_POLLING_ACTIVE:
+ assert(0);
+#endif
+ }
+
+ c->T = T;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_replace(T, 1);
+ lua_settop(T, 1);
+ return lua_yield(T, 1);
+error:
+ push_error(T, conn);
+ PQfinish(conn);
+ return 2;
+}
+
+static int
+connection_reset(lua_State *T)
+{
+ struct connection *c;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ if (PQresetStart(c->conn) != 1)
+ goto error;
+
+ c->w.cb = connect_handler;
+ switch (PQconnectPoll(c->conn)) {
+ case PGRES_POLLING_READING:
+ lem_debug("PGRES_POLLING_READING");
+ ev_io_set(&c->w, PQsocket(c->conn), EV_READ);
+ break;
+
+ case PGRES_POLLING_WRITING:
+ lem_debug("PGRES_POLLING_WRITING");
+ ev_io_set(&c->w, PQsocket(c->conn), EV_WRITE);
+ break;
+
+ case PGRES_POLLING_FAILED:
+ lem_debug("PGRES_POLLING_FAILED");
+ goto error;
+
+ case PGRES_POLLING_OK:
+ lem_debug("PGRES_POLLING_OK");
+ return 1;
+
+#ifndef NDEBUG
+ case PGRES_POLLING_ACTIVE:
+ assert(0);
+#endif
+ }
+
+ c->T = T;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_settop(T, 1);
+ return lua_yield(T, 1);
+error:
+ push_error(T, c->conn);
+ return 2;
+}
+
+static void
+push_tuples(lua_State *T, PGresult *res)
+{
+ int rows = PQntuples(res);
+ int columns = PQnfields(res);
+ int i;
+
+ lua_createtable(T, rows, 0);
+ for (i = 0; i < rows; i++) {
+ int j;
+
+ lua_createtable(T, columns, 0);
+ for (j = 0; j < columns; j++) {
+ if (PQgetisnull(res, i, j))
+ lua_pushnil(T);
+ else
+ lua_pushlstring(T, PQgetvalue(res, i, j),
+ PQgetlength(res, i, j));
+ lua_rawseti(T, -2, j+1);
+ }
+ lua_rawseti(T, -2, i+1);
+ }
+
+ /* insert column names as "row 0" */
+ lua_createtable(T, columns, 0);
+ for (i = 0; i < columns; i++) {
+ lua_pushstring(T, PQfname(res, i));
+ lua_rawseti(T, -2, i+1);
+ }
+ lua_rawseti(T, -2, 0);
+}
+
+static void
+error_handler(EV_P_ struct ev_io *w, int revents)
+{
+ struct connection *c = (struct connection *)w;
+
+ (void)revents;
+
+ if (PQconsumeInput(c->conn) == 0) {
+ ev_io_stop(EV_A_ &c->w);
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ return;
+ }
+
+ while (!PQisBusy(c->conn)) {
+ PGresult *res = PQgetResult(c->conn);
+
+ if (res == NULL) {
+ ev_io_stop(EV_A_ &c->w);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ return;
+ }
+
+ PQclear(res);
+ }
+}
+
+static void
+exec_handler(EV_P_ struct ev_io *w, int revents)
+{
+ struct connection *c = (struct connection *)w;
+ PGresult *res;
+
+ (void)revents;
+
+ if (PQconsumeInput(c->conn) != 1) {
+ ev_io_stop(EV_A_ &c->w);
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ return;
+ }
+
+ while (!PQisBusy(c->conn)) {
+ res = PQgetResult(c->conn);
+
+ if (res == NULL) {
+ ev_io_stop(EV_A_ &c->w);
+ lem_debug("returning %d values", lua_gettop(c->T) - 1);
+ lem_queue(c->T, lua_gettop(c->T) - 1);
+ c->T = NULL;
+ return;
+ }
+
+ switch (PQresultStatus(res)) {
+ case PGRES_EMPTY_QUERY:
+ lem_debug("PGRES_EMPTY_QUERY");
+ lua_settop(c->T, 0);
+ lua_pushnil(c->T);
+ lua_pushliteral(c->T, "empty query");
+ goto error;
+
+ case PGRES_COMMAND_OK:
+ lem_debug("PGRES_COMMAND_OK");
+ lua_pushboolean(c->T, 1);
+ break;
+
+ case PGRES_TUPLES_OK:
+ lem_debug("PGRES_TUPLES_OK");
+ push_tuples(c->T, res);
+ break;
+
+ case PGRES_COPY_IN:
+ lem_debug("PGRES_COPY_IN");
+ (void)PQsetnonblocking(c->conn, 1);
+ case PGRES_COPY_OUT:
+ lem_debug("PGRES_COPY_OUT");
+ PQclear(res);
+ lua_pushboolean(c->T, 1);
+ lem_queue(c->T, lua_gettop(c->T) - 1);
+ c->T = NULL;
+ return;
+
+ case PGRES_BAD_RESPONSE:
+ lem_debug("PGRES_BAD_RESPONSE");
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ goto error;
+
+ case PGRES_NONFATAL_ERROR:
+ lem_debug("PGRES_NONFATAL_ERROR");
+ break;
+
+ case PGRES_FATAL_ERROR:
+ lem_debug("PGRES_FATAL_ERROR");
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ goto error;
+
+ default:
+ lem_debug("unknown result status");
+ lua_settop(c->T, 0);
+ lua_pushnil(c->T);
+ lua_pushliteral(c->T, "unknown result status");
+ goto error;
+ }
+
+ PQclear(res);
+ }
+
+ lem_debug("busy");
+ return;
+error:
+ PQclear(res);
+ c->w.cb = error_handler;
+ while (!PQisBusy(c->conn)) {
+ res = PQgetResult(c->conn);
+
+ if (res == NULL) {
+ ev_io_stop(EV_A_ &c->w);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ return;
+ }
+
+ PQclear(res);
+ }
+}
+
+static int
+connection_exec(lua_State *T)
+{
+ struct connection *c;
+ const char *command;
+ int n;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ command = luaL_checkstring(T, 2);
+
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ n = lua_gettop(T) - 2;
+ if (n > 0) {
+ const char **values = lem_xmalloc(n * sizeof(char *));
+ int *lengths = lem_xmalloc(n * sizeof(int));
+ int i;
+
+ for (i = 0; i < n; i++) {
+ size_t len;
+
+ values[i] = lua_tolstring(T, i+3, &len);
+ lengths[i] = len;
+ }
+
+ n = PQsendQueryParams(c->conn, command, n,
+ NULL, values, lengths, NULL, 0);
+ free(values);
+ free(lengths);
+ } else
+ n = PQsendQuery(c->conn, command);
+
+ if (n != 1) {
+ lem_debug("PQsendQuery failed");
+ push_error(T, c->conn);
+ return 2;
+ }
+
+ c->T = T;
+ c->w.cb = exec_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_settop(T, 1);
+ return lua_yield(T, 1);
+}
+
+static int
+connection_prepare(lua_State *T)
+{
+ struct connection *c;
+ const char *name;
+ const char *query;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ name = luaL_checkstring(T, 2);
+ query = luaL_checkstring(T, 3);
+
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ if (PQsendPrepare(c->conn, name, query, 0, NULL) != 1) {
+ push_error(T, c->conn);
+ return 2;
+ }
+
+ c->T = T;
+ c->w.cb = exec_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_settop(T, 1);
+ return lua_yield(T, 1);
+}
+
+static int
+connection_run(lua_State *T)
+{
+ struct connection *c;
+ const char *name;
+ const char **values;
+ int *lengths;
+ int n;
+ int i;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ name = luaL_checkstring(T, 2);
+
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ n = lua_gettop(T) - 2;
+ values = lem_xmalloc(n * sizeof(char *));
+ lengths = lem_xmalloc(n * sizeof(int));
+
+ for (i = 0; i < n; i++) {
+ size_t len;
+
+ values[i] = lua_tolstring(T, i+3, &len);
+ lengths[i] = len;
+ }
+
+ n = PQsendQueryPrepared(c->conn, name, n,
+ values, lengths, NULL, 0);
+ free(values);
+ free(lengths);
+ if (n != 1) {
+ push_error(T, c->conn);
+ return 2;
+ }
+
+ c->T = T;
+ c->w.cb = exec_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_settop(T, 1);
+ return lua_yield(T, 1);
+}
+
+static void
+put_handler(EV_P_ struct ev_io *w, int revents)
+{
+ struct connection *c = (struct connection *)w;
+ size_t len;
+ const char *data;
+
+ (void)revents;
+
+ data = lua_tolstring(c->T, 2, &len);
+ switch (PQputCopyData(c->conn, data, (int)len)) {
+ case 1: /* data sent */
+ lem_debug("data sent");
+ ev_io_stop(EV_A_ &c->w);
+
+ lua_settop(c->T, 0);
+ lua_pushboolean(c->T, 1);
+ lem_queue(c->T, 1);
+ c->T = NULL;
+ break;
+
+ case 0: /* would block */
+ lem_debug("would block");
+ break;
+
+ default: /* should be -1 for error */
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ break;
+ }
+}
+
+static int
+connection_put(lua_State *T)
+{
+ struct connection *c;
+ size_t len;
+ const char *data;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ data = luaL_checklstring(T, 2, &len);
+
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ switch (PQputCopyData(c->conn, data, (int)len)) {
+ case 1: /* data sent */
+ lem_debug("data sent");
+ lua_pushboolean(T, 1);
+ return 1;
+
+ case 0: /* would block */
+ lem_debug("would block");
+ break;
+
+ default: /* should be -1 for error */
+ push_error(T, c->conn);
+ return 2;
+ }
+
+ c->T = T;
+ c->w.cb = put_handler;
+ c->w.events = EV_WRITE;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_settop(T, 2);
+ return lua_yield(T, 2);
+}
+
+static void
+done_handler(EV_P_ struct ev_io *w, int revents)
+{
+ struct connection *c = (struct connection *)w;
+ const char *error = lua_tostring(c->T, 2);
+
+ (void)revents;
+
+ switch (PQputCopyEnd(c->conn, error)) {
+ case 1: /* data sent */
+ lem_debug("data sent");
+ ev_io_stop(EV_A_ &c->w);
+ lua_settop(c->T, 1);
+ (void)PQsetnonblocking(c->conn, 0);
+ c->w.cb = exec_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_A_ &c->w);
+ break;
+
+ case 0: /* would block */
+ lem_debug("would block");
+ break;
+
+ default: /* should be -1 for error */
+ ev_io_stop(EV_A_ &c->w);
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ break;
+ }
+}
+
+static int
+connection_done(lua_State *T)
+{
+ struct connection *c;
+ const char *error;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ error = luaL_optstring(T, 2, NULL);
+
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ switch (PQputCopyEnd(c->conn, error)) {
+ case 1: /* data sent */
+ lem_debug("data sent");
+ (void)PQsetnonblocking(c->conn, 0);
+ c->T = T;
+ c->w.cb = exec_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_G_ &c->w);
+ lua_settop(c->T, 1);
+ return lua_yield(c->T, 1);
+
+ case 0: /* would block */
+ lem_debug("would block");
+ break;
+
+ default: /* should be -1 for error */
+ push_error(T, c->conn);
+ return 2;
+ }
+
+ c->T = T;
+ c->w.cb = done_handler;
+ c->w.events = EV_WRITE;
+ ev_io_start(EV_G_ &c->w);
+
+ if (error == NULL) {
+ lua_settop(T, 1);
+ lua_pushnil(T);
+ } else
+ lua_settop(T, 2);
+ return lua_yield(T, 2);
+}
+
+static void
+get_handler(EV_P_ struct ev_io *w, int revents)
+{
+ struct connection *c = (struct connection *)w;
+ char *buf;
+ int ret;
+
+ ret = PQgetCopyData(c->conn, &buf, 1);
+ if (ret > 0) {
+ lem_debug("got data");
+ ev_io_stop(EV_A_ &c->w);
+
+ lua_pushlstring(c->T, buf, ret);
+ PQfreemem(buf);
+ lem_queue(c->T, 1);
+ c->T = NULL;
+ return;
+ }
+
+ switch (ret) {
+ case 0: /* would block */
+ lem_debug("would block");
+ break;
+
+ case -1: /* no more data */
+ lem_debug("no more data");
+ c->w.cb = exec_handler;
+ exec_handler(EV_A_ &c->w, revents);
+ break;
+
+ default: /* should be -2 for error */
+ ev_io_stop(EV_A_ &c->w);
+ lua_settop(c->T, 0);
+ push_error(c->T, c->conn);
+ lem_queue(c->T, 2);
+ c->T = NULL;
+ break;
+ }
+}
+
+static int
+connection_get(lua_State *T)
+{
+ struct connection *c;
+ char *buf;
+ int ret;
+
+ luaL_checktype(T, 1, LUA_TUSERDATA);
+ c = lua_touserdata(T, 1);
+ if (c->T != NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "busy");
+ return 2;
+ }
+
+ if (c->conn == NULL) {
+ lua_pushnil(T);
+ lua_pushliteral(T, "closed");
+ return 2;
+ }
+
+ ret = PQgetCopyData(c->conn, &buf, 1);
+ if (ret > 0) {
+ lem_debug("got data");
+ lua_pushlstring(T, buf, ret);
+ PQfreemem(buf);
+ return 1;
+ }
+
+ switch (ret) {
+ case 0: /* would block */
+ lem_debug("would block");
+ c->T = T;
+ c->w.cb = get_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_G_ &c->w);
+
+ lua_settop(T, 1);
+ return lua_yield(T, 1);
+
+ case -1: /* no more data */
+ lem_debug("no more data");
+ break;
+
+ default: /* should be -2 for error */
+ push_error(T, c->conn);
+ return 2;
+ }
+
+ c->T = T;
+ c->w.cb = exec_handler;
+ c->w.events = EV_READ;
+ ev_io_start(EV_G_ &c->w);
+
+ /* TODO: it is necessary but kinda ugly to call
+ * the exec_handler directly from here.
+ * find a better solution... */
+ lua_settop(T, 1);
+ exec_handler(EV_G_ &c->w, 0);
+ return lua_yield(T, 1);
+}
+
+int
+luaopen_lem_postgres(lua_State *L)
+{
+ lua_newtable(L);
+
+ /* create Connection metatable mt */
+ lua_newtable(L);
+ lua_pushvalue(L, -1);
+ lua_setfield(L, -2, "__index");
+ /* mt.__gc = <connection_gc> */
+ lua_pushcfunction(L, connection_gc);
+ lua_setfield(L, -2, "__gc");
+ /* mt.close = <connection_close> */
+ lua_pushcfunction(L, connection_close);
+ lua_setfield(L, -2, "close");
+ /* mt.connect = <connection_connect> */
+ lua_pushvalue(L, -1); /* upvalue 1: Connection */
+ lua_pushcclosure(L, connection_connect, 1);
+ lua_setfield(L, -3, "connect");
+ /* mt.reset = <connection_reset> */
+ lua_pushcfunction(L, connection_reset);
+ lua_setfield(L, -2, "reset");
+ /* mt.exec = <connection_exec> */
+ lua_pushcfunction(L, connection_exec);
+ lua_setfield(L, -2, "exec");
+ /* mt.prepare = <connection_prepare> */
+ lua_pushcfunction(L, connection_prepare);
+ lua_setfield(L, -2, "prepare");
+ /* mt.run = <connection_run> */
+ lua_pushcfunction(L, connection_run);
+ lua_setfield(L, -2, "run");
+ /* mt.put = <connection_put> */
+ lua_pushcfunction(L, connection_put);
+ lua_setfield(L, -2, "put");
+ /* mt.done = <connection_done> */
+ lua_pushcfunction(L, connection_done);
+ lua_setfield(L, -2, "done");
+ /* mt.get = <connection_get> */
+ lua_pushcfunction(L, connection_get);
+ lua_setfield(L, -2, "get");
+ /* set Connection */
+ lua_setfield(L, -2, "Connection");
+
+ return 1;
+}
diff --git a/qtest.lua b/qtest.lua
new file mode 100755
index 0000000..c1c9c0e
--- /dev/null
+++ b/qtest.lua
@@ -0,0 +1,114 @@
+#!/usr/bin/env lem
+--
+-- This file is part of lem-postgres.
+-- Copyright 2011 Emil Renner Berthing
+--
+-- lem-postgres is free software: you can redistribute it and/or
+-- modify it under the terms of the GNU General Public License as
+-- published by the Free Software Foundation, either version 3 of
+-- the License, or (at your option) any later version.
+--
+-- lem-postgres is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with lem-postgres. If not, see <http://www.gnu.org/licenses/>.
+--
+
+print("Entering " .. arg[0])
+
+local prettyprint
+do
+ local write, format, tostring = io.write, string.format, tostring
+
+ function prettyprint(t)
+ local widths = {}
+ for i = 1, #t[0] do
+ widths[i] = 0
+ end
+
+ for i = 0, #t do
+ local row = t[i]
+ for j = 1, #row do
+ local value = row[j]
+ if value and #value > widths[j] then
+ widths[j] = #value
+ end
+ end
+ end
+
+ for i = 1, #widths do
+ widths[i] = '%-' .. tostring(widths[i] + 1) .. 's';
+ end
+
+ for i = 0, #t do
+ local row = t[i]
+ for j = 1, #row do
+ write(format(widths[j], row[j] or 'NULL'))
+ end
+ write('\n')
+ end
+ end
+end
+
+local utils = require 'lem.utils'
+local postgres = require 'lem.postgres.queued'
+
+local db = assert(postgres.connect("host=localhost dbname=mydb"))
+
+assert(db:exec(
+'CREATE TABLE mytable (id integer PRIMARY KEY, name CHARACTER VARYING)'))
+
+do
+ local raw = db:lock()
+ assert(raw:exec("COPY mytable FROM STDIN (delimiter ',')"))
+ assert(raw:put('1,alpha\n'))
+ assert(raw:put('2,beta\n'))
+ assert(raw:put('3,gamma\n'))
+ assert(raw:put('4,delta\n'))
+ assert(raw:done())
+ db:unlock()
+end
+
+utils.spawn(function()
+ assert(db:prepare('mystmt', 'SELECT * FROM mytable WHERE id = $1'))
+ local res = assert(db:run('mystmt', '3'))
+ prettyprint(res)
+end)
+
+utils.spawn(function()
+ local res = assert(db:exec('SELECT * FROM mytable WHERE id = $1', '1'))
+ prettyprint(res)
+end)
+
+utils.spawn(function()
+ local res1, res2 = assert(db:exec([[
+SELECT count(id) FROM mytable;
+SELECT * FROM mytable WHERE id = 2]]));
+ prettyprint(res2)
+end)
+
+do
+ local raw = db:lock()
+ assert(raw:exec("COPY mytable TO STDIN (format csv)"))
+
+ print("\nDumping CSV:")
+ while true do
+ local row = assert(raw:get())
+ if type(row) ~= 'string' then break end
+
+ io.write(row)
+ end
+
+ db:unlock()
+end
+
+utils.timer(1.0, function()
+ assert(db:exec('DROP TABLE mytable'))
+end)
+
+print("Exiting " .. arg[0])
+
+-- vim: syntax=lua ts=2 sw=2 noet:
diff --git a/queued.lua b/queued.lua
new file mode 100644
index 0000000..05496e4
--- /dev/null
+++ b/queued.lua
@@ -0,0 +1,96 @@
+--
+-- This file is part of lem-postgres.
+-- Copyright 2011 Emil Renner Berthing
+--
+-- lem-postgres is free software: you can redistribute it and/or
+-- modify it under the terms of the GNU General Public License as
+-- published by the Free Software Foundation, either version 3 of
+-- the License, or (at your option) any later version.
+--
+-- lem-postgres is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with lem-postgres. If not, see <http://www.gnu.org/licenses/>.
+--
+
+local utils = require 'lem.utils'
+local postgres = require 'lem.postgres'
+
+local QConnection = {}
+QConnection.__index = QConnection
+
+function QConnection:close()
+ local ok, err = self.conn:close()
+ for i = 1, self.n - 1 do
+ self[i]:wakeup()
+ self[i] = nil
+ end
+ return ok, err
+end
+QConnection.__gc = QConnection.close
+
+do
+ local remove = table.remove
+ local newsleeper = utils.sleeper
+
+ local function lock(self)
+ local n = self.n
+ if n == 0 then
+ self.n = 1
+ else
+ local sleeper = newsleeper()
+ self[n] = sleeper
+ self.n = n + 1
+ sleeper:sleep()
+ end
+ return self.conn
+ end
+ QConnection.lock = lock
+
+ local function unlock(self, ...)
+ local n = self.n - 1
+ self.n = n
+ if n > 0 then
+ remove(self, 1):wakeup()
+ end
+ return ...
+ end
+ QConnection.unlock = unlock
+
+ local function wrap(method)
+ return function(self, ...)
+ return unlock(self, method(lock(self), ...))
+ end
+ end
+
+ local Connection = postgres.Connection
+ QConnection.exec = wrap(Connection.exec)
+ QConnection.prepare = wrap(Connection.prepare)
+ QConnection.run = wrap(Connection.run)
+end
+
+local qconnect
+do
+ local setmetatable = setmetatable
+ local connect = postgres.connect
+
+ function qconnect(...)
+ local conn, err = connect(...)
+ if not conn then return nil, err end
+
+ return setmetatable({
+ n = 0,
+ conn = conn,
+ }, QConnection)
+ end
+end
+
+return {
+ QConnection = QConnection,
+ connect = qconnect,
+}
+
+-- vim: syntax=lua ts=2 sw=2 noet:
diff --git a/test.lua b/test.lua
new file mode 100755
index 0000000..4c56263
--- /dev/null
+++ b/test.lua
@@ -0,0 +1,98 @@
+#!/usr/bin/env lem
+--
+-- This file is part of lem-postgres.
+-- Copyright 2011 Emil Renner Berthing
+--
+-- lem-postgres is free software: you can redistribute it and/or
+-- modify it under the terms of the GNU General Public License as
+-- published by the Free Software Foundation, either version 3 of
+-- the License, or (at your option) any later version.
+--
+-- lem-postgres is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with lem-postgres. If not, see <http://www.gnu.org/licenses/>.
+--
+
+print("Entering " .. arg[0])
+
+local prettyprint
+do
+ local write, format, tostring = io.write, string.format, tostring
+
+ function prettyprint(t)
+ local widths = {}
+ for i = 1, #t[0] do
+ widths[i] = 0
+ end
+
+ for i = 0, #t do
+ local row = t[i]
+ for j = 1, #row do
+ local value = row[j]
+ if value and #value > widths[j] then
+ widths[j] = #value
+ end
+ end
+ end
+
+ for i = 1, #widths do
+ widths[i] = '%-' .. tostring(widths[i] + 1) .. 's';
+ end
+
+ for i = 0, #t do
+ local row = t[i]
+ for j = 1, #row do
+ write(format(widths[j], row[j] or 'NULL'))
+ end
+ write('\n')
+ end
+ end
+end
+
+local utils = require 'lem.utils'
+local postgres = require 'lem.postgres'
+
+local db = assert(postgres.connect("host=localhost dbname=mydb"))
+
+assert(db:exec(
+'CREATE TABLE mytable (id integer PRIMARY KEY, name CHARACTER VARYING)'))
+
+assert(db:exec("COPY mytable FROM STDIN (delimiter ',')"))
+assert(db:put('1,alpha\n'))
+assert(db:put('2,beta\n'))
+assert(db:put('3,gamma\n'))
+assert(db:put('4,delta\n'))
+assert(db:done())
+
+local res = assert(db:exec('SELECT * FROM mytable WHERE id = $1', '1'))
+prettyprint(res)
+
+local res1, res2 = assert(db:exec([[
+SELECT count(id) FROM mytable;
+SELECT * FROM mytable WHERE id = 2;
+]]));
+prettyprint(res2)
+
+assert(db:prepare('mystmt', 'SELECT * FROM mytable WHERE id = $1'))
+local res = assert(db:run('mystmt', '3'))
+prettyprint(res)
+
+assert(db:exec("COPY mytable TO STDIN (format csv)"))
+
+print("\nDumping CSV:")
+while true do
+ local row = assert(db:get())
+ if type(row) ~= 'string' then break end
+
+ io.write(row)
+end
+
+assert(db:exec('DROP TABLE mytable'))
+
+print("Exiting " .. arg[0])
+
+-- vim: syntax=lua ts=2 sw=2 noet:
--
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