use CacheControl and Vary

src/network/cache/Cache.zig

@@ -81,6 +81,13 @@ pub const Vary = union(enum) {
         return .{ .value = value };
     }
 
+    pub fn deinit(self: Vary, allocator: std.mem.Allocator) void {
+        switch (self) {
+            .wildcard => {},
+            .value => |v| allocator.free(v),
+        }
+    }
+
     pub fn toString(self: Vary) []const u8 {
         return switch (self) {
             .wildcard => "*",
@@ -96,19 +103,14 @@ pub const CachedMetadata = struct {
     status: u16,
     stored_at: i64,
     age_at_store: u64,
-    max_age: u64,
 
     // for If-None-Match
     etag: ?[]const u8,
     // for If-Modified-Since
     last_modified: ?[]const u8,
-    // If non-null, must be incorporated into cache key.
-    vary: ?[]const u8,
-
-    must_revalidate: bool,
-    no_cache: bool,
-    immutable: bool,
 
+    cache_control: CacheControl,
+    vary: ?Vary,
     headers: []const Http.Header,
 
     pub fn fromHeaders(
@@ -143,7 +145,7 @@ pub const CachedMetadata = struct {
         // return null for uncacheable responses
         if (cc.no_store) return null;
         if (vary) |v| if (v == .wildcard) return null;
-        const resolved_max_age = cc.max_age orelse return null;
+        if (cc.max_age == null) return null;
 
         return .{
             .url = url,
@@ -151,13 +153,10 @@ pub const CachedMetadata = struct {
             .status = status,
             .stored_at = timestamp,
             .age_at_store = age_at_store,
-            .max_age = resolved_max_age,
             .etag = etag,
             .last_modified = last_modified,
-            .must_revalidate = cc.must_revalidate,
-            .no_cache = cc.no_cache,
-            .immutable = cc.immutable,
-            .vary = if (vary) |v| v.toString() else null,
+            .cache_control = cc,
+            .vary = vary,
             .headers = headers,
         };
     }
@@ -170,15 +169,9 @@ pub const CachedMetadata = struct {
             allocator.free(header.value);
         }
         allocator.free(self.headers);
+        if (self.vary) |v| v.deinit(allocator);
         if (self.etag) |e| allocator.free(e);
         if (self.last_modified) |lm| allocator.free(lm);
-        if (self.vary) |v| allocator.free(v);
-    }
-
-    pub fn isAgeStale(self: *const CachedMetadata) bool {
-        const now = std.time.timestamp();
-        const age = now - self.stored_at + @as(i64, @intCast(self.age_at_store));
-        return age < @as(i64, @intCast(self.max_age));
     }
 };
 

src/network/cache/FsCache.zig

@@ -59,25 +59,35 @@ fn hashKey(key: []const u8) [HASHED_KEY_LEN]u8 {
 
 fn serializeMeta(writer: *std.Io.Writer, meta: *const CachedMetadata) !void {
     try writer.print("{s}\n{s}\n", .{ meta.url, meta.content_type });
-    try writer.print("{d}\n{d}\n{d}\n{d}\n", .{
+    try writer.print("{d}\n{d}\n{d}\n", .{
         meta.status,
         meta.stored_at,
         meta.age_at_store,
-        meta.max_age,
     });
     try writer.print("{s}\n", .{meta.etag orelse "null"});
     try writer.print("{s}\n", .{meta.last_modified orelse "null"});
-    try writer.print("{s}\n", .{meta.vary orelse "null"});
-    try writer.print("{}\n{}\n{}\n", .{
-        meta.must_revalidate,
-        meta.no_cache,
-        meta.immutable,
+
+    // cache-control
+    try writer.print("{d}\n", .{meta.cache_control.max_age orelse 0});
+    try writer.print("{}\n{}\n{}\n{}\n", .{
+        meta.cache_control.max_age != null,
+        meta.cache_control.must_revalidate,
+        meta.cache_control.no_cache,
+        meta.cache_control.immutable,
     });
+
+    // vary
+    if (meta.vary) |v| {
+        try writer.print("{s}\n", .{v.toString()});
+    } else {
+        try writer.print("null\n", .{});
+    }
     try writer.flush();
 
     try writer.print("{d}\n", .{meta.headers.len});
     for (meta.headers) |hdr| {
         try writer.print("{s}\n{s}\n", .{ hdr.name, hdr.value });
+        try writer.flush();
     }
     try writer.flush();
 }
@@ -121,24 +131,29 @@ fn deserializeMeta(allocator: std.mem.Allocator, file: std.fs.File) !CachedMetad
         const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
         break :blk std.fmt.parseInt(u64, line, 10) catch return error.Malformed;
     };
-    const max_age = blk: {
-        const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
-        break :blk std.fmt.parseInt(u64, line, 10) catch return error.Malformed;
-    };
 
     const etag = blk: {
         const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
         break :blk if (std.mem.eql(u8, line, "null")) null else try allocator.dupe(u8, line);
     };
+    errdefer if (etag) |e| allocator.free(e);
+
     const last_modified = blk: {
         const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
         break :blk if (std.mem.eql(u8, line, "null")) null else try allocator.dupe(u8, line);
     };
-    const vary = blk: {
-        const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
-        break :blk if (std.mem.eql(u8, line, "null")) null else try allocator.dupe(u8, line);
-    };
+    errdefer if (last_modified) |lm| allocator.free(lm);
 
+    // cache-control
+    const cc = cache_control: {
+        const max_age_val = blk: {
+            const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
+            break :blk std.fmt.parseInt(u64, line, 10) catch return error.Malformed;
+        };
+        const max_age_present = blk: {
+            const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
+            break :blk try deserializeMetaBoolean(line);
+        };
         const must_revalidate = blk: {
             const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
             break :blk try deserializeMetaBoolean(line);
@@ -151,6 +166,22 @@ fn deserializeMeta(allocator: std.mem.Allocator, file: std.fs.File) !CachedMetad
             const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
             break :blk try deserializeMetaBoolean(line);
         };
+        break :cache_control Cache.CacheControl{
+            .max_age = if (max_age_present) max_age_val else null,
+            .must_revalidate = must_revalidate,
+            .no_cache = no_cache,
+            .immutable = immutable,
+        };
+    };
+
+    // vary
+    const vary = blk: {
+        const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
+        if (std.mem.eql(u8, line, "null")) break :blk null;
+        const duped = try allocator.dupe(u8, line);
+        break :blk Cache.Vary.parse(duped);
+    };
+    errdefer if (vary) |v| if (v == .value) allocator.free(v.value);
 
     const headers = blk: {
         const line = try reader.takeDelimiter('\n') orelse return error.Malformed;
@@ -184,12 +215,9 @@ fn deserializeMeta(allocator: std.mem.Allocator, file: std.fs.File) !CachedMetad
         .status = status,
         .stored_at = stored_at,
         .age_at_store = age_at_store,
-        .max_age = max_age,
+        .cache_control = cc,
         .etag = etag,
         .last_modified = last_modified,
-        .must_revalidate = must_revalidate,
-        .no_cache = no_cache,
-        .immutable = immutable,
         .vary = vary,
         .headers = headers,
     };