Add error_response

Start adding connection abstraction

1 files changed, 49 insertions, 0 deletions

diff --git a/src/conn.zig b/src/conn.zig
new file mode 100644
index 0000000..870ab01
--- /dev/null
+++ b/src/conn.zig
@@ -0,0 +1,49 @@
+const std = @import("std");
+const SSHashMap = std.StringHashMap([]const u8);
+const Config = @import("config.zig");
+const StartupMessage = @import("startup_message.zig");
+const AuthenticationOk = @import("authentication_ok.zig");
+const AuthenticationCleartextPassword = @import("authentication_cleartext_password.zig");
+const ErrorResponse = @import("error_response.zig");
+
+const Conn = @This();
+
+const ConnStatus = enum {
+    connStatusUninitialized,
+    connStatusConnecting,
+    connStatusClosed,
+    connStatusIdle,
+    connStatusBusy,
+};
+
+stream: std.net.Stream,
+config: Config,
+status: ConnStatus,
+
+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 writer = stream.writer();
+
+    errdefer stream.close();
+    var params = SSHashMap.init(allocator);
+    errdefer params.deinit();
+    try params.put("user", config.user);
+    if (config.database) |database| try params.put(database);
+    var sm = StartupMessage{
+        .parameters = params,
+    };
+    defer sm.deinit(allocator);
+    try sm.write(allocator, writer);
+}
+
+const StartupMessageResponseType = enum(u8) {
+    ErrorResponse = 'E',
+    AuthenticationResponse = AuthenticationOk.Tag, // All the authentication responses share a message type and must be decoded by the next field
+};
+const StartupMessageResponse = union(StartupMessageResponseType) {
+    error: ErrorResponse,
+};
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