add library tests (deinitialization currently failing)

This commit is contained in:
Emil Lerch 2023-08-01 19:50:37 -07:00
parent 9a0f564e84
commit 2662591c91
Signed by untrusted user: lobo
GPG Key ID: A7B62D657EF764F8

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@ -1,4 +1,5 @@
const std = @import("std");
const builtin = @import("builtin");
const HandlerFn = *const fn (std.mem.Allocator, []const u8) anyerror![]const u8;
@ -9,7 +10,7 @@ const log = std.log.scoped(.lambda);
pub fn run(allocator: ?std.mem.Allocator, event_handler: HandlerFn) !void { // TODO: remove inferred error set?
const prefix = "http://";
const postfix = "/2018-06-01/runtime/invocation";
const lambda_runtime_uri = std.os.getenv("AWS_LAMBDA_RUNTIME_API").?;
const lambda_runtime_uri = std.os.getenv("AWS_LAMBDA_RUNTIME_API") orelse test_lambda_runtime_uri.?;
// TODO: If this is null, go into single use command line mode
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@ -26,7 +27,12 @@ pub fn run(allocator: ?std.mem.Allocator, event_handler: HandlerFn) !void { // T
defer empty_headers.deinit();
log.info("tid {d} (lambda): Bootstrap initializing with event url: {s}", .{ std.Thread.getCurrentId(), url });
while (true) {
while (lambda_remaining_requests == null or lambda_remaining_requests.? > 0) {
if (lambda_remaining_requests) |*r| {
// we're under test
log.debug("lambda remaining requests: {d}", .{r.*});
r.* -= 1;
}
var req_alloc = std.heap.ArenaAllocator.init(alloc);
defer req_alloc.deinit();
const req_allocator = req_alloc.allocator();
@ -185,3 +191,186 @@ pub fn run(allocator: ?std.mem.Allocator, event_handler: HandlerFn) !void { // T
};
}
}
////////////////////////////////////////////////////////////////////////
// All code below this line is for testing
////////////////////////////////////////////////////////////////////////
var server_port: ?u16 = null;
var server_remaining_requests: usize = 0;
var lambda_remaining_requests: ?usize = null;
var server_response: []const u8 = "unset";
var server_request_aka_lambda_response: []u8 = "";
var test_lambda_runtime_uri: ?[]u8 = null;
var server_ready = false;
/// This starts a test server. We're not testing the server itself,
/// so the main tests will start this thing up and create an arena around the
/// whole thing so we can just deallocate everything at once at the end,
/// leaks be damned
fn startServer(allocator: std.mem.Allocator) !std.Thread {
return try std.Thread.spawn(
.{},
threadMain,
.{allocator},
);
}
fn threadMain(allocator: std.mem.Allocator) !void {
var server = std.http.Server.init(allocator, .{ .reuse_address = true });
// defer server.deinit();
const address = try std.net.Address.parseIp("127.0.0.1", 0);
try server.listen(address);
server_port = server.socket.listen_address.in.getPort();
test_lambda_runtime_uri = try std.fmt.allocPrint(allocator, "127.0.0.1:{d}", .{server_port.?});
log.debug("server listening at {s}", .{test_lambda_runtime_uri.?});
defer server.deinit();
defer test_lambda_runtime_uri = null;
defer server_port = null;
log.info("starting server thread, tid {d}", .{std.Thread.getCurrentId()});
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var aa = arena.allocator();
// We're in control of all requests/responses, so this flag will tell us
// when it's time to shut down
while (server_remaining_requests > 0) {
server_remaining_requests -= 1;
// defer {
// if (!arena.reset(.{ .retain_capacity = {} })) {
// // reallocation failed, arena is degraded
// log.warn("Arena reset failed and is degraded. Resetting arena", .{});
// arena.deinit();
// arena = std.heap.ArenaAllocator.init(allocator);
// aa = arena.allocator();
// }
// }
processRequest(aa, &server) catch |e| {
log.err("Unexpected error processing request: {any}", .{e});
if (@errorReturnTrace()) |trace| {
std.debug.dumpStackTrace(trace.*);
}
};
}
}
fn processRequest(allocator: std.mem.Allocator, server: *std.http.Server) !void {
server_ready = true;
errdefer server_ready = false;
log.debug(
"tid {d} (server): server waiting to accept. requests remaining: {d}",
.{ std.Thread.getCurrentId(), server_remaining_requests + 1 },
);
var res = try server.accept(.{ .allocator = allocator });
server_ready = false;
defer res.deinit();
defer _ = res.reset();
try res.wait(); // wait for client to send a complete request head
const errstr = "Internal Server Error\n";
var errbuf: [errstr.len]u8 = undefined;
@memcpy(&errbuf, errstr);
var response_bytes: []const u8 = errbuf[0..];
if (res.request.content_length) |l|
server_request_aka_lambda_response = try res.reader().readAllAlloc(allocator, @as(usize, l));
log.debug(
"tid {d} (server): {d} bytes read from request",
.{ std.Thread.getCurrentId(), server_request_aka_lambda_response.len },
);
// try response.headers.append("content-type", "text/plain");
response_bytes = serve(allocator, &res) catch |e| brk: {
res.status = .internal_server_error;
// TODO: more about this particular request
log.err("Unexpected error from executor processing request: {any}", .{e});
if (@errorReturnTrace()) |trace| {
std.debug.dumpStackTrace(trace.*);
}
break :brk "Unexpected error generating request to lambda";
};
res.transfer_encoding = .{ .content_length = response_bytes.len };
try res.do();
_ = try res.writer().writeAll(response_bytes);
try res.finish();
log.debug(
"tid {d} (server): sent response",
.{std.Thread.getCurrentId()},
);
}
fn serve(allocator: std.mem.Allocator, res: *std.http.Server.Response) ![]const u8 {
_ = allocator;
// try res.headers.append("content-length", try std.fmt.allocPrint(allocator, "{d}", .{server_response.len}));
try res.headers.append("Lambda-Runtime-Aws-Request-Id", "69");
return server_response;
}
fn handler(allocator: std.mem.Allocator, event_data: []const u8) ![]const u8 {
_ = allocator;
return event_data;
}
fn test_run(allocator: std.mem.Allocator, event_handler: HandlerFn) !std.Thread {
return try std.Thread.spawn(
.{},
run,
.{ allocator, event_handler },
);
}
fn lambda_request(allocator: std.mem.Allocator, request: []const u8) ![]u8 {
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var aa = arena.allocator();
// Setup our server to run, and set the response for the server to the
// request. There is a cognitive disconnect here between mental model and
// physical model.
//
// Mental model:
//
// Lambda request -> λ -> Lambda response
//
// Physcial Model:
//
// 1. λ requests instructions from server
// 2. server provides "Lambda request"
// 3. λ posts response back to server
//
// So here we are setting up our server, then our lambda request loop,
// but it all needs to be in seperate threads so we can control startup
// and shut down. Both server and Lambda are set up to watch global variable
// booleans to know when to shut down. This function is designed for a
// single request/response pair only
server_remaining_requests = 2; // Tell our server to run for just two requests
server_response = request; // set our instructions to lambda, which in our
// physical model above, is the server response
defer server_response = "unset"; // set it back so we don't get confused later
// when subsequent tests fail
const server_thread = try startServer(aa); // start the server, get it ready
while (!server_ready)
std.time.sleep(100);
log.debug("tid {d} (main): server reports ready", .{std.Thread.getCurrentId()});
// we aren't testing the server,
// so we'll use the arena allocator
defer server_thread.join(); // we'll be shutting everything down before we exit
// Now we need to start the lambda framework, following a siimilar pattern
lambda_remaining_requests = 1; // in case anyone messed with this, we will make sure we start
const lambda_thread = try test_run(allocator, handler); // We want our function under test to report leaks
lambda_thread.join();
return server_request_aka_lambda_response;
}
test "basic request" {
// std.testing.log_level = .debug;
const allocator = std.testing.allocator;
const request =
\\{"foo": "bar", "baz": "qux"}
;
const lambda_response = try lambda_request(allocator, request);
try std.testing.expectEqualStrings(lambda_response, request);
}