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My version of https://github.com/vercel-labs/fx
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Zig
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const Allocator = std.mem.Allocator;
pub const ttl_ms: i64 = 15 * 60 * 1000;pub const default_max_entries: usize = 1024;pub const default_max_metadata_bytes: usize = 4 * 1024 * 1024;
pub const Clock = struct { ctx: *anyopaque = @ptrCast(&default_clock_context), now_fn: *const fn (*anyopaque) i64 = defaultNow,
pub fn now(self: Clock) i64 { return self.now_fn(self.ctx); }};
var default_clock_context: u8 = 0;
fn defaultNow(_: *anyopaque) i64 { const ts = std.Io.Clock.awake.now(io_mod.getIo()); return @intCast(@divFloor(ts.nanoseconds, 1_000_000));}
pub const ArtifactRef = struct { store_id: []const u8, handle: []const u8, display_path: []const u8, byte_count: usize,};
pub const CacheEntryData = struct { submitted_url: []const u8, final_url: []const u8, status: std.http.Status, mime_type: []const u8, content_kind: content_contract.Kind, converted_content: []const u8 = "", artifact_ref: ?ArtifactRef = null,};
pub const CacheSnapshot = struct { submitted_url: []u8, final_url: []u8, status: std.http.Status, mime_type: []u8, content_kind: content_contract.Kind, converted_content: []u8, artifact_ref: ?OwnedArtifactRef = null, cache_hit: bool = false,
pub const OwnedArtifactRef = struct { store_id: []u8, handle: []u8, display_path: []u8, byte_count: usize, };
pub fn deinit(self: *CacheSnapshot, alloc: Allocator) void { alloc.free(self.submitted_url); alloc.free(self.final_url); alloc.free(self.mime_type); alloc.free(self.converted_content); if (self.artifact_ref) |ref| { alloc.free(ref.store_id); alloc.free(ref.handle); alloc.free(ref.display_path); } self.* = undefined; }};
pub const Config = struct { allocator: Allocator = std.heap.c_allocator, clock: Clock = .{}, max_converted_bytes: usize = 50 * 1024 * 1024, max_entries: usize = default_max_entries, max_metadata_bytes: usize = default_max_metadata_bytes,};
pub const Runtime = struct { config: Config, mutex: std.Io.Mutex = .init, entries: std.ArrayList(Entry) = .empty, converted_bytes: usize = 0, metadata_bytes: usize = 0, lru_tick: u64 = 0, lock_depth: usize = 0,
pub fn init(config: Config) Runtime { return .{ .config = config }; }
pub fn deinit(self: *Runtime, _: Allocator) void { const alloc = self.config.allocator; for (self.entries.items) |*entry| entry.deinit(alloc); self.entries.deinit(alloc); self.* = Runtime.init(self.config); }
pub fn lookup(self: *Runtime, alloc: Allocator, submitted_url: []const u8, artifact_store: ?*web_fetch_artifacts.Store) !?CacheSnapshot { var snapshot: CacheSnapshot = undefined; var artifact_handle_for_check: ?[]u8 = null; errdefer if (artifact_handle_for_check) |handle| alloc.free(handle);
{ self.lock(); defer self.unlock();
self.evictExpiredLocked(self.config.clock.now()); const index = self.findIndexLocked(submitted_url) orelse return null; if (self.entries.items[index].artifact_ref) |artifact_ref| { const active_store = artifact_store orelse { self.removeAtLocked(index); return null; }; if (!std.mem.eql(u8, artifact_ref.store_id, active_store.id())) { self.removeAtLocked(index); return null; } artifact_handle_for_check = try alloc.dupe(u8, artifact_ref.handle); }
self.lru_tick += 1; self.entries.items[index].last_used = self.lru_tick; snapshot = try self.entries.items[index].snapshot(alloc); snapshot.cache_hit = true; }
if (artifact_handle_for_check) |handle| { artifact_handle_for_check = null; defer alloc.free(handle); const active_store = artifact_store.?; const exists = active_store.contains(handle) catch |err| { snapshot.deinit(alloc); return err; }; if (!exists) { snapshot.deinit(alloc); self.removeArtifactRefIfStillMissing(submitted_url, handle); return null; } } return snapshot; }
pub fn insert(self: *Runtime, _: Allocator, data: CacheEntryData) !void { if (data.converted_content.len > content_contract.max_converted_content_bytes) return error.ConvertedContentTooLarge;
self.lock(); defer self.unlock();
self.evictExpiredLocked(self.config.clock.now()); if (self.findIndexLocked(data.submitted_url)) |index| self.removeAtLocked(index);
const metadata_weight = metadataWeight(data); if (metadata_weight > self.config.max_metadata_bytes) return; if (data.converted_content.len > self.config.max_converted_bytes) return;
self.lru_tick += 1; const cache_alloc = self.config.allocator; var entry = try Entry.fromData(cache_alloc, data, .{ .expires_at_ms = self.config.clock.now() + ttl_ms, .last_used = self.lru_tick, .metadata_weight = metadata_weight, }); errdefer entry.deinit(cache_alloc);
try self.entries.append(cache_alloc, entry); self.converted_bytes += entry.converted_content.len; self.metadata_bytes += entry.metadata_weight; self.evictOverBudgetLocked(); }
pub fn convertedBytes(self: *Runtime) usize { self.lock(); defer self.unlock(); return self.converted_bytes; }
pub fn entryCount(self: *Runtime) usize { self.lock(); defer self.unlock(); return self.entries.items.len; }
pub fn metadataBytes(self: *Runtime) usize { self.lock(); defer self.unlock(); return self.metadata_bytes; }
pub fn lockHeldForTest(self: *Runtime) bool { return self.lock_depth > 0; }
fn lock(self: *Runtime) void { self.mutex.lockUncancelable(io_mod.getIo()); self.lock_depth += 1; }
fn unlock(self: *Runtime) void { self.lock_depth -= 1; self.mutex.unlock(io_mod.getIo()); }
fn findIndexLocked(self: *Runtime, submitted_url: []const u8) ?usize { for (self.entries.items, 0..) |entry, index| { if (std.mem.eql(u8, entry.submitted_url, submitted_url)) return index; } return null; }
fn evictExpiredLocked(self: *Runtime, now_ms: i64) void { var index: usize = 0; while (index < self.entries.items.len) { if (self.entries.items[index].expires_at_ms > now_ms) { index += 1; continue; } self.removeAtLocked(index); } }
fn evictOverBudgetLocked(self: *Runtime) void { while (self.entries.items.len > self.config.max_entries or self.converted_bytes > self.config.max_converted_bytes or self.metadata_bytes > self.config.max_metadata_bytes) { const index = self.leastRecentlyUsedIndexLocked() orelse return; self.removeAtLocked(index); } }
fn leastRecentlyUsedIndexLocked(self: *Runtime) ?usize { if (self.entries.items.len == 0) return null; var selected: usize = 0; for (self.entries.items[1..], 1..) |entry, index| { if (entry.last_used < self.entries.items[selected].last_used) selected = index; } return selected; }
fn removeAtLocked(self: *Runtime, index: usize) void { var entry = self.entries.swapRemove(index); self.converted_bytes -= entry.converted_content.len; self.metadata_bytes -= entry.metadata_weight; entry.deinit(self.config.allocator); }
fn removeArtifactRefIfStillMissing(self: *Runtime, submitted_url: []const u8, handle: []const u8) void { self.lock(); defer self.unlock();
const index = self.findIndexLocked(submitted_url) orelse return; const artifact_ref = self.entries.items[index].artifact_ref orelse return; if (std.mem.eql(u8, artifact_ref.handle, handle)) self.removeAtLocked(index); }};
const EntryInit = struct { expires_at_ms: i64, last_used: u64, metadata_weight: usize,};
const Entry = struct { submitted_url: []u8, final_url: []u8, status: std.http.Status, mime_type: []u8, content_kind: content_contract.Kind, converted_content: []u8, artifact_ref: ?CacheSnapshot.OwnedArtifactRef = null, expires_at_ms: i64, last_used: u64, metadata_weight: usize,
fn fromData(alloc: Allocator, data: CacheEntryData, init: EntryInit) !Entry { const submitted_url = try alloc.dupe(u8, data.submitted_url); errdefer alloc.free(submitted_url); const final_url = try alloc.dupe(u8, data.final_url); errdefer alloc.free(final_url); const mime_type = try alloc.dupe(u8, data.mime_type); errdefer alloc.free(mime_type); const converted_content = try alloc.dupe(u8, data.converted_content); errdefer alloc.free(converted_content); const artifact_ref = if (data.artifact_ref) |ref| try cloneArtifactRef(alloc, ref) else null; errdefer if (artifact_ref) |owned| freeArtifactRef(alloc, owned);
return .{ .submitted_url = submitted_url, .final_url = final_url, .status = data.status, .mime_type = mime_type, .content_kind = data.content_kind, .converted_content = converted_content, .artifact_ref = artifact_ref, .expires_at_ms = init.expires_at_ms, .last_used = init.last_used, .metadata_weight = init.metadata_weight, }; }
fn deinit(self: *Entry, alloc: Allocator) void { alloc.free(self.submitted_url); alloc.free(self.final_url); alloc.free(self.mime_type); alloc.free(self.converted_content); if (self.artifact_ref) |ref| freeArtifactRef(alloc, ref); self.* = undefined; }
fn snapshot(self: Entry, alloc: Allocator) !CacheSnapshot { const submitted_url = try alloc.dupe(u8, self.submitted_url); errdefer alloc.free(submitted_url); const final_url = try alloc.dupe(u8, self.final_url); errdefer alloc.free(final_url); const mime_type = try alloc.dupe(u8, self.mime_type); errdefer alloc.free(mime_type); const converted_content = try alloc.dupe(u8, self.converted_content); errdefer alloc.free(converted_content); const artifact_ref = if (self.artifact_ref) |ref| try cloneOwnedArtifactRef(alloc, ref) else null; errdefer if (artifact_ref) |owned| freeArtifactRef(alloc, owned);
return .{ .submitted_url = submitted_url, .final_url = final_url, .status = self.status, .mime_type = mime_type, .content_kind = self.content_kind, .converted_content = converted_content, .artifact_ref = artifact_ref, }; }};
fn metadataWeight(data: CacheEntryData) usize { var weight: usize = 32; weight += data.submitted_url.len; weight += data.final_url.len; weight += data.mime_type.len; if (data.artifact_ref) |ref| { weight += ref.store_id.len; weight += ref.handle.len; weight += ref.display_path.len; weight += @sizeOf(usize); } return weight;}
fn cloneArtifactRef(alloc: Allocator, ref: ArtifactRef) !CacheSnapshot.OwnedArtifactRef { const store_id = try alloc.dupe(u8, ref.store_id); errdefer alloc.free(store_id); const handle = try alloc.dupe(u8, ref.handle); errdefer alloc.free(handle); const display_path = try alloc.dupe(u8, ref.display_path); return .{ .store_id = store_id, .handle = handle, .display_path = display_path, .byte_count = ref.byte_count };}
fn cloneOwnedArtifactRef(alloc: Allocator, ref: CacheSnapshot.OwnedArtifactRef) !CacheSnapshot.OwnedArtifactRef { return cloneArtifactRef(alloc, .{ .store_id = ref.store_id, .handle = ref.handle, .display_path = ref.display_path, .byte_count = ref.byte_count, });}
fn freeArtifactRef(alloc: Allocator, ref: CacheSnapshot.OwnedArtifactRef) void { alloc.free(ref.store_id); alloc.free(ref.handle); alloc.free(ref.display_path);}
const MutableClock = struct { now_ms: i64,
fn now(raw: *anyopaque) i64 { const self: *@This() = @ptrCast(@alignCast(raw)); return self.now_ms; }};
fn testRuntime(clock: *MutableClock, max_converted_bytes: usize, max_entries: usize, max_metadata_bytes: usize) Runtime { return Runtime.init(.{ .allocator = std.testing.allocator, .clock = .{ .ctx = @ptrCast(clock), .now_fn = MutableClock.now }, .max_converted_bytes = max_converted_bytes, .max_entries = max_entries, .max_metadata_bytes = max_metadata_bytes, });}
test "web_fetch cache expires at fifteen minutes and evicts by converted bytes" { const alloc = std.testing.allocator; var clock = MutableClock{ .now_ms = 1000 }; var runtime = testRuntime(&clock, 10, 8, 4096); defer runtime.deinit(alloc);
try runtime.insert(alloc, .{ .submitted_url = "https://example.com/a", .final_url = "https://example.com/a", .status = .ok, .mime_type = "text/plain", .content_kind = .text, .converted_content = "12345", }); try runtime.insert(alloc, .{ .submitted_url = "https://example.com/b", .final_url = "https://example.com/b", .status = .ok, .mime_type = "text/plain", .content_kind = .text, .converted_content = "67890", }); try runtime.insert(alloc, .{ .submitted_url = "https://example.com/c", .final_url = "https://example.com/c", .status = .ok, .mime_type = "text/plain", .content_kind = .text, .converted_content = "abcde", });
try std.testing.expectEqual(@as(usize, 2), runtime.entryCount()); try std.testing.expect((try runtime.lookup(alloc, "https://example.com/a", null)) == null);
var hit = (try runtime.lookup(alloc, "https://example.com/c", null)) orelse return error.TestExpectedEqual; defer hit.deinit(alloc); try std.testing.expect(hit.cache_hit);
clock.now_ms += ttl_ms + 1; try std.testing.expect((try runtime.lookup(alloc, "https://example.com/c", null)) == null);}
test "web_fetch cache snapshots remain valid after post lookup eviction" { const alloc = std.testing.allocator; var clock = MutableClock{ .now_ms = 1 }; var runtime = testRuntime(&clock, 6, 8, 4096); defer runtime.deinit(alloc);
try runtime.insert(alloc, .{ .submitted_url = "https://example.com/a", .final_url = "https://example.com/a", .status = .ok, .mime_type = "text/plain", .content_kind = .text, .converted_content = "abc", }); var snapshot = (try runtime.lookup(alloc, "https://example.com/a", null)) orelse return error.TestExpectedEqual; defer snapshot.deinit(alloc);
try runtime.insert(alloc, .{ .submitted_url = "https://example.com/b", .final_url = "https://example.com/b", .status = .ok, .mime_type = "text/plain", .content_kind = .text, .converted_content = "defghi", });
try std.testing.expect((try runtime.lookup(alloc, "https://example.com/a", null)) == null); try std.testing.expectEqualStrings("abc", snapshot.converted_content);}
test "web_fetch cache caps entry count and metadata weight" { const alloc = std.testing.allocator; var clock = MutableClock{ .now_ms = 1 }; var runtime = testRuntime(&clock, 1024, 2, 120); defer runtime.deinit(alloc);
try runtime.insert(alloc, .{ .submitted_url = "https://example.com/a", .final_url = "https://example.com/a", .status = .ok, .mime_type = "text/plain", .content_kind = .text }); try runtime.insert(alloc, .{ .submitted_url = "https://example.com/b", .final_url = "https://example.com/b", .status = .ok, .mime_type = "text/plain", .content_kind = .text }); try runtime.insert(alloc, .{ .submitted_url = "https://example.com/c", .final_url = "https://example.com/c", .status = .ok, .mime_type = "text/plain", .content_kind = .text });
try std.testing.expect(runtime.entryCount() <= 2); try std.testing.expect(runtime.metadataBytes() <= 120);}
test "web_fetch durable artifact cache refs are scoped to artifact store identity" { const alloc = std.testing.allocator; var clock = MutableClock{ .now_ms = 1 }; var runtime = testRuntime(&clock, 1024, 8, 4096); defer runtime.deinit(alloc); var tmp_a = std.testing.tmpDir(.{}); defer tmp_a.cleanup(); var tmp_b = std.testing.tmpDir(.{}); defer tmp_b.cleanup(); const session_a = try io_mod.dirRealpathAlloc(alloc, tmp_a.dir, "."); defer alloc.free(session_a); const session_b = try io_mod.dirRealpathAlloc(alloc, tmp_b.dir, "."); defer alloc.free(session_b); var store_a = try web_fetch_artifacts.Store.init(alloc, session_a); defer store_a.deinit(); var store_b = try web_fetch_artifacts.Store.init(alloc, session_b); defer store_b.deinit(); var artifact = try store_a.write(alloc, "application/pdf", "pdf"); defer artifact.deinit(alloc);
try runtime.insert(alloc, .{ .submitted_url = "https://example.com/report.pdf", .final_url = "https://example.com/report.pdf", .status = .ok, .mime_type = "application/pdf", .content_kind = .binary, .artifact_ref = .{ .store_id = store_a.id(), .handle = artifact.handle, .display_path = artifact.display_path, .byte_count = artifact.byte_count, }, });
var hit = (try runtime.lookup(alloc, "https://example.com/report.pdf", &store_a)) orelse return error.TestExpectedEqual; defer hit.deinit(alloc); try std.testing.expectEqualStrings(store_a.id(), hit.artifact_ref.?.store_id);
try std.testing.expect((try runtime.lookup(alloc, "https://example.com/report.pdf", &store_b)) == null); try std.testing.expect((try runtime.lookup(alloc, "https://example.com/report.pdf", &store_a)) == null);}
test "web_fetch cache eviction preserves returned durable artifact" { const alloc = std.testing.allocator; var clock = MutableClock{ .now_ms = 1 }; var runtime = testRuntime(&clock, 1024, 1, 4096); defer runtime.deinit(alloc); var tmp = std.testing.tmpDir(.{}); defer tmp.cleanup(); const session_dir = try io_mod.dirRealpathAlloc(alloc, tmp.dir, "."); defer alloc.free(session_dir); var store = try web_fetch_artifacts.Store.init(alloc, session_dir); defer store.deinit(); var artifact = try store.write(alloc, "application/pdf", "pdf bytes"); defer artifact.deinit(alloc);
try runtime.insert(alloc, .{ .submitted_url = "https://example.com/report.pdf", .final_url = "https://example.com/report.pdf", .status = .ok, .mime_type = "application/pdf", .content_kind = .binary, .artifact_ref = .{ .store_id = store.id(), .handle = artifact.handle, .display_path = artifact.display_path, .byte_count = artifact.byte_count, }, }); try runtime.insert(alloc, .{ .submitted_url = "https://example.com/next", .final_url = "https://example.com/next", .status = .ok, .mime_type = "text/plain", .content_kind = .text, .converted_content = "next", });
try std.testing.expect((try runtime.lookup(alloc, "https://example.com/report.pdf", &store)) == null); try std.testing.expect(try store.contains(artifact.handle));}
test "web_fetch cache lock is not held across target http" { var clock = MutableClock{ .now_ms = 1 }; var runtime = testRuntime(&clock, 1024, 8, 4096); defer runtime.deinit(std.testing.allocator);
try std.testing.expect(!runtime.lockHeldForTest());}