lobo/lambda-zig
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move lambda runtime interface out of main

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This commit is contained in:
Emil Lerch 2021-10-02 12:23:19 -07:00
parent 602a23b8f4
commit 35e09a2472
Signed by: lobo
GPG Key ID: A7B62D657EF764F8
2 changed files with 68 additions and 58 deletions
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57
src/lambda.zig Normal file
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@ -0,0 +1,57 @@
const std = @import("std");
const requestz = @import("requestz");
pub fn run(event_handler: fn (*std.mem.Allocator, []const u8) anyerror![]const u8) !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");
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const allocator = &gpa.allocator;
const url = try std.fmt.allocPrint(allocator, "{s}{s}{s}/next", .{ prefix, lambda_runtime_uri, postfix });
defer allocator.free(url);
std.log.info("Event Url: {s}", .{url});
while (true) {
var req_alloc = std.heap.ArenaAllocator.init(allocator);
defer req_alloc.deinit();
const req_allocator = &req_alloc.allocator;
var client = try requestz.Client.init(req_allocator);
// defer client.deinit();
var response = client.get(url, .{}) catch |err| {
// TODO: report error
std.log.err("Get fail: {}", .{err});
continue;
};
defer response.deinit();
var request_id: ?[]const u8 = null;
for (response.headers.items()) |h| {
if (std.mem.indexOf(u8, h.name.value, "Lambda-Runtime-Aws-Request-Id")) |_|
request_id = h.value;
}
if (request_id == null) {
// TODO: report error
std.log.err("Could not find request id: skipping request", .{});
continue;
}
const req_id = request_id.?;
const event_response = event_handler(req_allocator, response.body) catch |err| {
// TODO: report error
std.log.err("Error posting response for request id {s}: {}", .{ req_id, err });
continue;
};
const response_url = try std.fmt.allocPrint(req_allocator, "{s}{s}{s}/{s}/response", .{ prefix, lambda_runtime_uri, postfix, req_id });
// defer req_allocator.free(response_url);
var resp_resp = client.post(response_url, .{ .content = event_response }) catch |err| {
// TODO: report error
std.log.err("Error posting response for request id {s}: {}", .{ req_id, err });
continue;
};
defer resp_resp.deinit();
}
}

69
src/main.zig
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@ -1,67 +1,20 @@
const std = @import("std");
const requestz = @import("requestz");
const lambda = @import("lambda.zig");
// zig build -Drelease-safe && strip zig-out/bin/bootstrap && zip -j9 function.zip zig-out/bin/bootstrap && aws lambda update-function-code --function-name zig-test --zip-file fileb://function.zip
// zig package -Drelease-safe does the following:
//
// zig build -Drelease-safe
// strip zig-out/bin/bootstrap # should this be stripped?
// zip -j9 zig-out/bin/function.zip zig-out/bin/bootstrap
//
// zig deploy will also do something like:
//
// aws lambda update-function-code --function-name zig-test --zip-file fileb://function.zip
pub fn main() anyerror!void {
try run(handler);
try lambda.run(handler);
}
fn handler(allocator: *std.mem.Allocator, event_data: []const u8) ![]const u8 {
_ = allocator;
return event_data;
}
pub fn run(event_handler: fn (*std.mem.Allocator, []const u8) anyerror![]const u8) !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");
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const allocator = &gpa.allocator;
const url = try std.fmt.allocPrint(allocator, "{s}{s}{s}/next", .{ prefix, lambda_runtime_uri, postfix });
defer allocator.free(url);
std.log.info("Event Url: {s}", .{url});
while (true) {
var req_alloc = std.heap.ArenaAllocator.init(allocator);
defer req_alloc.deinit();
const req_allocator = &req_alloc.allocator;
var client = try requestz.Client.init(req_allocator);
// defer client.deinit();
var response = client.get(url, .{}) catch |err| {
// TODO: report error
std.log.err("Get fail: {}", .{err});
continue;
};
defer response.deinit();
var request_id: ?[]const u8 = null;
for (response.headers.items()) |h| {
if (std.mem.indexOf(u8, h.name.value, "Lambda-Runtime-Aws-Request-Id")) |_|
request_id = h.value;
}
if (request_id == null) {
// TODO: report error
std.log.err("Could not find request id: skipping request", .{});
continue;
}
const req_id = request_id.?;
const event_response = event_handler(req_allocator, response.body) catch |err| {
// TODO: report error
std.log.err("Error posting response for request id {s}: {}", .{ req_id, err });
continue;
};
const response_url = try std.fmt.allocPrint(req_allocator, "{s}{s}{s}/{s}/response", .{ prefix, lambda_runtime_uri, postfix, req_id });
// defer req_allocator.free(response_url);
var resp_resp = client.post(response_url, .{ .content = event_response }) catch |err| {
// TODO: report error
std.log.err("Error posting response for request id {s}: {}", .{ req_id, err });
continue;
};
defer resp_resp.deinit();
}
}