add context for current providers

build.zig

@@ -19,7 +19,7 @@ pub fn build(b: *std.Build) !void {
         .name = "universal-lambda-zig",
         // In this case the main source file is merely a path, however, in more
         // complicated build scripts, this could be a generated file.
-        .root_source_file = .{ .path = "src/main.zig" },
+        .root_source_file = .{ .path = "src/universal_lambda_build.zig" },
         .target = target,
         .optimize = optimize,
     });

src/flexilib-interface.zig

@@ -17,6 +17,9 @@ pub const Response = extern struct {
 };
 
 pub const Request = extern struct {
+    target: [*]const u8,
+    target_len: usize,
+
     method: [*:0]u8,
     method_len: usize,
 
@@ -33,6 +36,7 @@ threadlocal var allocator: ?*std.mem.Allocator = null;
 const log = std.log.scoped(.interface);
 
 pub const ZigRequest = struct {
+    target: []const u8,
     method: [:0]u8,
     content: []u8,
     headers: []Header,
@@ -104,6 +108,7 @@ pub fn handleRequest(request: *Request, zigRequestHandler: ZigRequestHandler) ?*
     zigRequestHandler(
         alloc,
         .{
+            .target = request.target[0..request.target_len],
             .method = request.method[0..request.method_len :0],
             .content = request.content[0..request.content_len],
             .headers = request.headers[0..request.headers_len],

src/flexilib.zig

@@ -62,23 +62,11 @@ export fn handle_request(request: *interface.Request) callconv(.C) ?*interface.R
 fn handleRequest(allocator: std.mem.Allocator, request: interface.ZigRequest, response: interface.ZigResponse) !void {
     // setup
     var response_writer = response.body.writer();
-    try response_writer.writeAll(try client_handler.handler(allocator, request.content, .{}));
-    // real work
-    for (request.headers) |h| {
-        const header = interface.toZigHeader(h);
-        // std.debug.print("\n{s}: {s}\n", .{ header.name, header.value });
-        if (std.ascii.eqlIgnoreCase(header.name, "host") and std.mem.startsWith(u8, header.value, "iam")) {
-            try response_writer.print("iam response", .{});
-            return;
-        }
-        if (std.ascii.eqlIgnoreCase(header.name, "x-slow")) {
-            std.time.sleep(std.time.ns_per_ms * (std.fmt.parseInt(usize, header.value, 10) catch 1000));
-            try response_writer.print("i am slow\n\n", .{});
-            return;
-        }
-    }
-    try response.headers.put("X-custom-foo", "bar");
-    log.info("handlerequest header count {d}", .{response.headers.count()});
+    // dispatch to our actual handler
+    try response_writer.writeAll(try client_handler.handler(allocator, request.content, .{ .flexilib = .{
+        .request = request,
+        .response = response,
+    } }));
 }
 // Need to figure out how tests would work
 test "handle_request" {

src/lambda.zig

@@ -67,7 +67,10 @@ pub fn run(allocator: ?std.mem.Allocator, event_handler: HandlerFn) !void { // T
         // reasonable to report back
         const event = ev.?;
         defer ev.?.deinit();
-        const event_response = event_handler(req_allocator, event.event_data, .{}) catch |err| {
+        // Lambda does not have context, just environment variables. API Gateway
+        // might be configured to pass in lots of context, but this comes through
+        // event data, not context.
+        const event_response = event_handler(req_allocator, event.event_data, .{ .none = {} }) catch |err| {
             event.reportError(@errorReturnTrace(), err, lambda_runtime_uri) catch unreachable;
             continue;
         };

src/universal_lambda.zig

@@ -1,12 +1,19 @@
 const std = @import("std");
 const build_options = @import("build_options");
-
+const flexilib = @import("flexilib-interface.zig"); // TODO: pull in flexilib directly
 pub const HandlerFn = *const fn (std.mem.Allocator, []const u8, Context) anyerror![]const u8;
 
 const log = std.log.scoped(.universal_lambda);
 
 // TODO: Should this be union?
-pub const Context = struct {};
+pub const Context = union(enum) {
+    web_request: *std.http.Server.Response,
+    flexilib: struct {
+        request: flexilib.Request,
+        response: flexilib.Response,
+    },
+    none: void,
+};
 
 const runFn = blk: {
     switch (build_options.build_type) {
@@ -37,11 +44,12 @@ fn runExe(allocator: ?std.mem.Allocator, event_handler: HandlerFn) !void {
 
     const aa = arena.allocator();
 
+    const data = try std.io.getStdIn().reader().readAllAlloc(aa, std.math.maxInt(usize));
     // We're setting up an arena allocator. While we could use a gpa and get
     // some additional safety, this is now "production" runtime, and those
     // things are better handled by unit tests
     const writer = std.io.getStdOut().writer();
-    try writer.writeAll(try event_handler(aa, "", .{}));
+    try writer.writeAll(try event_handler(aa, data, .{ .none = {} }));
     try writer.writeAll("\n");
 }
 
@@ -105,7 +113,7 @@ fn processRequest(aa: std.mem.Allocator, server: *std.http.Server, event_handler
         try aa.dupe(u8, "");
     // no need to free - will be handled by arena
 
-    response_bytes = event_handler(aa, body, .{}) catch |e| brk: {
+    response_bytes = event_handler(aa, body, .{ .web_request = &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});