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const std = @import("std");
const log = std.log.scoped(.pgz);
const SSHashMap = std.StringHashMap([]const u8);
const Config = @import("config.zig");
const proto = @import("../proto/proto.zig");
const StartupMessage = proto.StartupMessage;
const PasswordMessage = proto.PasswordMessage;
const BackendMessage = proto.BackendMessage;
const RowDescription = proto.RowDescription;
const read_message = proto.read_message;
const ProtocolError = @import("../main.zig").ProtocolError;
const ServerError = @import("../main.zig").ServerError;
const ClientError = @import("../main.zig").ClientError;
const diagnosticReader = @import("../main.zig").diagnosticReader;
const Conn = @This();
const ConnStatus = enum {
connStatusUninitialized,
connStatusConnecting,
connStatusClosed,
connStatusIdle,
connStatusBusy,
};
allocator: std.mem.Allocator,
stream: std.net.Stream,
config: Config,
status: ConnStatus = .connStatusUninitialized,
pub fn connect(config: Config) !Conn {
const allocator = config.allocator;
var stream = switch (config.address) {
.net => |addr| try std.net.tcpConnectToAddress(addr),
.unix => |path| try std.net.connectUnixSocket(path),
};
var res = Conn{
.allocator = allocator,
.stream = stream,
.config = config,
};
errdefer res.deinit();
var writer = stream.writer();
var dr = diagnosticReader(100, stream.reader());
var reader = dr.reader();
_ = reader;
var params = SSHashMap.init(allocator);
try params.put("user", config.user);
if (config.database) |database| try params.put("database", database);
var sm = StartupMessage{
.parameters = params,
};
defer sm.deinit(allocator);
try sm.write(allocator, writer);
lp: while (true) {
var anymsg = try res.receive_message();
defer anymsg.deinit(allocator);
switch (anymsg) {
.ReadyForQuery => {
break :lp;
},
.AuthenticationRequest => |ar| {
switch (ar.inner_type) {
.AuthRequestTypeOk => {},
.AuthRequestTypeCleartextPassword => {
if (config.password) |password| {
const pm = PasswordMessage{ .password = password };
try pm.write(allocator, writer);
} else {
return ClientError.NoPasswordSupplied;
}
},
}
},
else => {
// deliberately do nothing, we must wait for ready before the connection can be used.
},
}
}
return res;
}
// Messages should always be received through this function.
// this'll handle generic stuff that should happen on the connection
fn receive_message(self: *Conn) !BackendMessage {
var anymsg = try read_message(self.allocator, self.stream.reader());
errdefer anymsg.deinit(self.allocator);
switch (anymsg) {
.ReadyForQuery => {
// TODO handle TxStatus
},
.ParameterStatus => {
// TODO handle parameter status
},
.ErrorResponse => |err| {
if (std.mem.eql(u8, err.severity, "FATAL")) {
self.status = .connStatusClosed;
// TODO close the connection here? But it should really be the caller's responsiblilty
return ServerError.ErrorResponse;
}
},
// .NoticeResponse => {
// // TODO handle notice response
// },
// .NotificationResponse => {
// // TODO handle notificationResponse
// },
.BackendKeyData => {
// TODO handle backend key data
},
else => {
// deliberately do nothing, caller can presumably handle them.
},
}
return anymsg;
}
pub fn deinit(self: *Conn) void {
self.stream.close();
}
pub const ResultIterator = struct {
conn: *Conn,
multi_iterator: ?*MultiResultIterator = null,
row_description: ?proto.RowDescription = null,
current_datarow: ?proto.DataRow = null,
command_complete: ?proto.CommandComplete = null,
pub fn deinit(self: *ResultIterator) void {
if (self.row_description != null) self.row_description.?.deinit(self.conn.allocator);
if (self.current_datarow != null) self.current_datarow.?.deinit(self.conn.allocator);
if (self.command_complete != null) self.command_complete.?.deinit(self.conn.allocator);
}
// NextRow advances the ResultIterator to the next row and returns true if a row is available.
pub fn next_row(self: *ResultIterator) !bool {
while (self.command_complete == null) {
var msg = try self.conn.receive_message();
switch (msg) {
.DataRow => |dr| {
if (self.row_description != null) self.row_description.?.deinit(self.conn.allocator);
self.current_datarow = dr;
return true;
},
.RowDescription => |rd| {
if (self.row_description != null) return ProtocolError.UnexpectedMessage;
self.row_description = rd;
},
.CommandComplete => |cc| {
if (self.command_complete != null) return ProtocolError.UnexpectedMessage;
self.command_complete = cc;
},
else => {
msg.deinit(self.conn.allocator);
},
}
}
return false;
}
// row returns the current row data
pub fn row(self: ResultIterator) ?[][]const u8 {
return if (self.current_datarow) |dr| dr.columns else null;
}
};
pub const MultiResultIterator = struct {
conn: *Conn,
cri: ?*ResultIterator = null,
pub fn next_result(self: *MultiResultIterator) !bool {
if ()
}
pub fn result(self: MultiResultIterator) ?*ResultIterator {
return self.cri;
}
fn receive_message(self: *MultiResultIterator) !BackendMessage {
_ = self;
return error.NotImplemented;
}
};
// pub fn exec(self: *Conn) {
// }
test "connect unix" {
// must have a local postgres runnning
// TODO maybe use docker to start one?
const allocator = std.testing.allocator;
const cfg = Config{
.allocator = allocator,
.address = .{ .unix = "/run/postgresql/.s.PGSQL.5432" },
.database = "martin",
.user = "martin",
};
var conn = try Conn.connect(cfg);
defer conn.deinit();
}
test "connect tcp with password" {
const allocator = std.testing.allocator;
const cfg = Config{
.allocator = allocator,
.address = .{ .net = std.net.Address{ .in = std.net.Ip4Address.init([4]u8{ 127, 0, 0, 1 }, 5432) } },
.database = "martin",
.user = "martin",
.password = "martin",
};
var conn = try Conn.connect(cfg);
defer conn.deinit();
}
test "connect tcp with wrong password" {
// TODO how to disable failing tests on error log
// const allocator = std.testing.allocator;
// const cfg = Config{
// .allocator = allocator,
// .address = .{ .net = std.net.Address{ .in = std.net.Ip4Address.init([4]u8{ 127, 0, 0, 1 }, 5432) } },
// .database = "martin",
// .user = "martin",
// .password = "foobar",
// };
// try std.testing.expectError(ServerError.ErrorResponse, Conn.connect(cfg));
}
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