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Native PostgreSQL driver / client for Zig
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pub const openssl = @cImport({ @cInclude("openssl/ssl.h"); @cInclude("openssl/err.h");});
const build_config = @import("config");
pub const log = std.log.scoped(.pg);
pub const types = @import("types.zig");pub const proto = @import("proto.zig");pub const auth = @import("auth.zig");pub const Conn = @import("conn.zig").Conn;pub const Stmt = @import("stmt.zig").Stmt;pub const Pool = @import("pool.zig").Pool;pub const Stream = @import("stream.zig").Stream;pub const metrics = @import("metrics.zig");pub const has_openssl = build_config.openssl;pub const SSLCtx = if (has_openssl) openssl.SSL_CTX else void;pub const default_column_names = build_config.column_names;
const result = @import("result.zig");pub const Row = result.Row;pub const RowUnsafe = result.RowUnsafe;pub const Result = result.Result;pub const Iterator = result.Iterator;pub const IteratorUnsafe = result.IteratorUnsafe;pub const QueryRow = result.QueryRow;pub const QueryRowUnsafe = result.QueryRowUnsafe;pub const Mapper = result.Mapper;
const reader = @import("reader.zig");pub const Reader = reader.Reader;pub const Message = reader.Message;
pub const testing = @import("t.zig");
const root = @import("root");const _assert = blk: { if (@hasDecl(root, "pg_assert")) { break :blk root.pg_assert; } switch (@import("builtin").mode) { .ReleaseFast, .ReleaseSmall => break :blk false, else => break :blk true, }};
pub const _stderr_tls = blk: { if (@hasDecl(root, "pg_stderr_tls")) { break :blk root.pg_stderr_tls; } break :blk false;};
pub fn assert(ok: bool) void { if (comptime _assert) { std.debug.assert(ok); }}
pub fn verifyDecodeType(comptime fail_mode: FailMode, comptime T: type, comptime expected_oids: []const i32, actual: i32) !void { if (comptime fail_mode == .safe) { if (isExpectedId(expected_oids, actual)) { return; } return error.InvalidType; }
if (comptime _assert == false) { return; }
if (isExpectedId(expected_oids, actual)) { return; }
log.warn("PostgreSQL value of type {s} cannot be read into a " ++ @typeName(T) ++ ". " ++ "pg.zig has strict type checking when reading value.", .{types.oidToString(actual)}); unreachable;}
fn isExpectedId(comptime expected_oids: []const i32, actual: i32) bool { inline for (expected_oids) |expected_oid| { if (expected_oid == actual) { return true; } } return false;}
pub fn verifyNotNull(comptime fail_mode: FailMode, comptime T: type, is_null: bool) !void { if (comptime fail_mode == .safe) { if (is_null == false) { return; } return error.UnexpectedNull; }
if (comptime _assert == false) { return; }
if (is_null == false) { return; }
log.warn("PostgreSQL null column cannot be read into non-optional type (" ++ @typeName(T) ++ "). " ++ "pg.zig has strict type checking when reading value.", .{}); unreachable;}
pub fn verifyColumnName(comptime fail_mode: FailMode, name: []const u8, valid: bool) !void { if (comptime fail_mode == .safe) { if (valid) { return; } return error.UnknownColumnName; }
if (comptime _assert == false) { return; }
if (valid) { return; }
log.warn("Unknown column name '{s}'", .{name}); unreachable;}
pub const ParsedOpts = struct { opts: Pool.Opts, arena: std.heap.ArenaAllocator,
pub fn deinit(self: *ParsedOpts) void { self.arena.deinit(); }};
pub fn parseOpts(uri: std.Uri, allocator: std.mem.Allocator) !ParsedOpts { if (!std.mem.eql(u8, uri.scheme, "postgresql") and !std.mem.eql(u8, uri.scheme, "postgres")) { return error.InvalidUriScheme; }
var arena = std.heap.ArenaAllocator.init(allocator); errdefer arena.deinit(); const aa = arena.allocator();
var tls: Conn.Opts.TLS = .off; var tcp_user_timeout: ?u32 = null; if (uri.query) |qry| { const query_string = try qry.toRawMaybeAlloc(aa); var it = std.mem.splitScalar(u8, query_string, '&'); while (it.next()) |param| { var it2 = std.mem.splitScalar(u8, param, '='); const key = it2.first(); const val = it2.rest(); if (std.mem.eql(u8, key, "tcp_user_timeout")) { tcp_user_timeout = try std.fmt.parseInt(u32, val, 10); } else if (std.mem.eql(u8, key, "sslmode")) { if (std.mem.eql(u8, val, "require")) { tls = .require; } else if (std.mem.eql(u8, val, "verify-full")) { tls = .{ .verify_full = null }; } else if (std.mem.eql(u8, val, "disable") == false) { return error.UnsupportedSSLModeValue; } } else { return error.UnsupportedConnectionParam; } } }
const path = std.mem.trimLeft(u8, try uri.path.toRawMaybeAlloc(aa), "/"); const host = if (uri.host) |host| try host.toRawMaybeAlloc(aa) else null; const username = if (uri.user) |user| try user.toRawMaybeAlloc(aa) else "postgres"; const password = if (uri.password) |password| try password.toRawMaybeAlloc(aa) else null;
// don't use `aa` after this point, we're about to copy `arena` and any usage // of `aa` will leak
return .{ .arena = arena, .opts = .{ .size = 0, .timeout = 0, .auth = .{ .username = username, .password = password, .database = if (path.len == 0) null else path, .timeout = tcp_user_timeout orelse 10_000, }, .connect = .{ .tls = tls, .port = uri.port orelse null, .host = host, }, } };}
pub fn initializeSSLContext(config: Conn.Opts.TLS) !*SSLCtx { // OpenSSL documentation says these are implicitly called, and only need to // be called if you're doing something special
// if (openssl.OPENSSL_init_ssl(openssl.OPENSSL_INIT_LOAD_SSL_STRINGS | openssl.OPENSSL_INIT_LOAD_CRYPTO_STRINGS, null) != 1) { // return error.OpenSSLInitSslFailed; // }
// if (openssl.OPENSSL_init_crypto(openssl.OPENSSL_INIT_ADD_ALL_CIPHERS | openssl.OPENSSL_INIT_ADD_ALL_DIGESTS | openssl.OPENSSL_INIT_LOAD_CRYPTO_STRINGS, null) != 1) { // return error.OpenSSLInitCryptoFailed; // }
const ctx = openssl.SSL_CTX_new(openssl.TLS_client_method()) orelse { return error.SSLContextNew; }; errdefer openssl.SSL_CTX_free(ctx);
if (openssl.SSL_CTX_set_min_proto_version(ctx, openssl.TLS1_2_VERSION) != 1) { return error.SSLMinVersion; }
_ = openssl.SSL_CTX_set_mode(ctx, openssl.SSL_MODE_AUTO_RETRY);
switch (config) { .off, .require => {}, .verify_full => |path_to_root| { if (path_to_root) |p| { var pathz: [std.fs.max_path_bytes + 1]u8 = undefined; @memcpy(pathz[0..p.len], p); pathz[p.len] = 0; if (openssl.SSL_CTX_load_verify_locations(ctx, pathz[0 .. p.len + 1].ptr, null) != 1) { if (comptime _stderr_tls) { printSSLError(); } return error.SSLVerifyPaths; } } else { if (openssl.SSL_CTX_set_default_verify_paths(ctx) != 1) { if (comptime _stderr_tls) { printSSLError(); } return error.SSLDefaultVerifyPaths; } } openssl.SSL_CTX_set_verify(ctx, openssl.SSL_VERIFY_PEER, null); }, }
return ctx;}
pub fn freeSSLContext(ctx: ?*SSLCtx) void { if (comptime has_openssl == false) { return; }
if (ctx) |c| { openssl.SSL_CTX_free(c); }}
pub fn printSSLError() void { if (comptime has_openssl == false) { return; }
const bio = openssl.BIO_new(openssl.BIO_s_mem()); defer _ = openssl.BIO_free(bio); openssl.ERR_print_errors(bio); var buf: [*]u8 = undefined; const len: usize = @intCast(openssl.BIO_get_mem_data(bio, &buf)); if (len > 0) { std.debug.print("{s}\n", .{buf[0..len]}); }}
pub const Binary = struct { data: []const u8,};
const TestCase = struct { uri: []const u8, expected_opts: Pool.Opts,};
pub const FailMode = enum { safe, unsafe,};
pub const TypeError = error{ InvalidType, UnexpectedNull, UnknownColumnName,};
const valid_tcs: [2]TestCase = .{ .{ .uri = "postgresql:///", .expected_opts = .{ .size = 0, .auth = .{ .username = "postgres" }, .connect = .{}, .timeout = 0 } }, .{ .uri = "postgresql://user:pass@somehost:1234/somedb?tcp_user_timeout=5678", .expected_opts = .{ .size = 0, .auth = .{ .username = "user", .password = "pass", .database = "somedb", .timeout = 5678, }, .connect = .{ .host = "somehost", .port = 1234, }, .timeout = 0 } },};
test "URI: parse valid" { const a = std.testing.allocator; for (valid_tcs) |tc| { var po = parseOpts(try std.Uri.parse(tc.uri), a) catch |e| { std.log.err("failed to parse URI {s}", .{tc.uri}); return e; }; defer po.deinit(); try std.testing.expectEqualDeep(tc.expected_opts, po.opts); }}
test "URI: invalid scheme" { try std.testing.expectError(error.InvalidUriScheme, parseOpts(try std.Uri.parse("foobar:///"), std.testing.allocator));}
test "URI: invalid params" { try std.testing.expectError(error.UnsupportedConnectionParam, parseOpts(try std.Uri.parse("postgresql:///?bar=baz"), std.testing.allocator));}