214 lines
9.2 KiB
Zig
214 lines
9.2 KiB
Zig
const builtin = @import("builtin");
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const std = @import("std");
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pub fn build(b: *std.build.Builder) !void {
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// Standard release options allow the person running `zig build` to select
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// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
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// const mode = b.standardReleaseOptions();
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const target = b.standardTargetOptions(.{});
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const optimize = b.standardOptimizeOption(.{});
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var exe = b.addExecutable(.{
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.name = "custom",
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.root_source_file = .{ .path = "src/main.zig" },
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.target = target,
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.optimize = optimize,
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});
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b.installArtifact(exe);
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try lambdaBuildOptions(b, exe);
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// TODO: We can cross-compile of course, but stripping and zip commands
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// may vary
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// TODO: Add test
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}
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fn fileExists(file_name: []const u8) bool {
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const file = std.fs.openFileAbsolute(file_name, .{}) catch return false;
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defer file.close();
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return true;
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}
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fn addArgs(allocator: std.mem.Allocator, original: []const u8, args: [][]const u8) ![]const u8 {
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var rc = original;
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for (args) |arg| {
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rc = try std.mem.concat(allocator, u8, &.{ rc, " ", arg });
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}
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return rc;
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}
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/// lambdaBuildOptions will add three build options to the build (if compiling
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/// the code on a Linux host):
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///
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/// * package: Packages the function for deployment to Lambda
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/// (dependencies are the zip executable and a shell)
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/// * iam: Gets an IAM role for the Lambda function, and creates it if it does not exist
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/// (dependencies are the AWS CLI, grep and a shell)
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/// * deploy: Deploys the lambda function to a live AWS environment
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/// (dependencies are the AWS CLI, and a shell)
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/// * remoterun: Runs the lambda function in a live AWS environment
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/// (dependencies are the AWS CLI, and a shell)
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///
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/// remoterun depends on deploy
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/// deploy depends on iam and package
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///
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/// iam and package do not have any dependencies
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pub fn lambdaBuildOptions(b: *std.build.Builder, exe: *std.Build.Step.Compile) !void {
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// The rest of this function is currently reliant on the use of Linux
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// system being used to build the lambda function
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//
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// It is likely that much of this will work on other Unix-like OSs, but
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// we will work this out later
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//
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// TODO: support other host OSs
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if (builtin.os.tag != .linux) return;
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// Package step
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const package_step = b.step("package", "Package the function");
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const function_zip = b.getInstallPath(.bin, "function.zip");
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// TODO: allow use of user-specified exe names
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// TODO: Avoid use of system-installed zip, maybe using something like
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// https://github.com/hdorio/hwzip.zig/blob/master/src/hwzip.zig
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const zip = if (std.mem.eql(u8, "bootstrap", exe.out_filename))
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try std.fmt.allocPrint(b.allocator,
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\\zip -qj9 {s} {s}
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, .{
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function_zip,
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b.getInstallPath(.bin, "bootstrap"),
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})
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else
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// We need to copy stuff around
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try std.fmt.allocPrint(b.allocator,
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\\cp {s} {s} && \
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\\zip -qj9 {s} {s} && \
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\\rm {s}
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, .{
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b.getInstallPath(.bin, exe.out_filename),
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b.getInstallPath(.bin, "bootstrap"),
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function_zip,
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b.getInstallPath(.bin, "bootstrap"),
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b.getInstallPath(.bin, "bootstrap"),
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});
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// std.debug.print("\nzip cmdline: {s}", .{zip});
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defer b.allocator.free(zip);
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var zip_cmd = b.addSystemCommand(&.{ "/bin/sh", "-c", zip });
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zip_cmd.step.dependOn(b.getInstallStep());
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package_step.dependOn(&zip_cmd.step);
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// Deployment
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const deploy_step = b.step("deploy", "Deploy the function");
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var deal_with_iam = true;
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if (b.args) |args| {
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for (args) |arg| {
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if (std.mem.eql(u8, "--role", arg)) {
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deal_with_iam = false;
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break;
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}
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}
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}
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// TODO: Allow custom lambda role names
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var iam_role: []u8 = &.{};
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const iam_step = b.step("iam", "Create/Get IAM role for function");
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deploy_step.dependOn(iam_step); // iam_step will either be a noop or all the stuff below
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if (deal_with_iam) {
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// if someone adds '-- --role arn...' to the command line, we don't
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// need to do anything with the iam role. Otherwise, we'll create/
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// get the IAM role and stick the name in a file in our destination
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// directory to be used later
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const iam_role_name_file = b.getInstallPath(.bin, "iam_role_name");
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iam_role = try std.fmt.allocPrint(b.allocator, "--role $(cat {s})", .{iam_role_name_file});
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// defer b.allocator.free(iam_role);
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if (!fileExists(iam_role_name_file)) {
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// Role get/creation command
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const ifstatement_fmt =
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\\ if aws iam get-role --role-name lambda_basic_execution 2>&1 |grep -q NoSuchEntity; then aws iam create-role --output text --query Role.Arn --role-name lambda_basic_execution --assume-role-policy-document '{
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\\ "Version": "2012-10-17",
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\\ "Statement": [
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\\ {
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\\ "Sid": "",
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\\ "Effect": "Allow",
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\\ "Principal": {
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\\ "Service": "lambda.amazonaws.com"
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\\ },
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\\ "Action": "sts:AssumeRole"
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\\ }
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\\ ]}' > /dev/null; fi && \
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\\ aws iam attach-role-policy --policy-arn arn:aws:iam::aws:policy/AWSLambdaExecute --role-name lambda_basic_execution && \
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\\ aws iam get-role --role-name lambda_basic_execution --query Role.Arn --output text >
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;
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const ifstatement = try std.mem.concat(b.allocator, u8, &[_][]const u8{ ifstatement_fmt, iam_role_name_file });
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defer b.allocator.free(ifstatement);
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iam_step.dependOn(&b.addSystemCommand(&.{ "/bin/sh", "-c", ifstatement }).step);
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}
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}
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const function_name = b.option([]const u8, "function-name", "Function name for Lambda [zig-fn]") orelse "zig-fn";
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const function_name_file = b.getInstallPath(.bin, function_name);
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const ifstatement = "if [ ! -f {s} ] || [ {s} -nt {s} ]; then if aws lambda get-function --function-name {s} 2>&1 |grep -q ResourceNotFoundException; then echo not found > /dev/null; {s}; else echo found > /dev/null; {s}; fi; fi";
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// The architectures option was introduced in 2.2.43 released 2021-10-01
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// We want to use arm64 here because it is both faster and cheaper for most
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// Amazon Linux 2 is the only arm64 supported option
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const not_found = "aws lambda create-function --architectures arm64 --runtime provided.al2 --function-name {s} --zip-file fileb://{s} --handler not_applicable {s} && touch {s}";
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const not_found_fmt = try std.fmt.allocPrint(b.allocator, not_found, .{ function_name, function_zip, iam_role, function_name_file });
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defer b.allocator.free(not_found_fmt);
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const found = "aws lambda update-function-code --function-name {s} --zip-file fileb://{s} && touch {s}";
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const found_fmt = try std.fmt.allocPrint(b.allocator, found, .{ function_name, function_zip, function_name_file });
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defer b.allocator.free(found_fmt);
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var found_final: []const u8 = undefined;
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var not_found_final: []const u8 = undefined;
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if (b.args) |args| {
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found_final = try addArgs(b.allocator, found_fmt, args);
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not_found_final = try addArgs(b.allocator, not_found_fmt, args);
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} else {
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found_final = found_fmt;
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not_found_final = not_found_fmt;
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}
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const cmd = try std.fmt.allocPrint(b.allocator, ifstatement, .{
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function_name_file,
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std.fs.path.dirname(exe.root_src.?.path).?,
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function_name_file,
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function_name,
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not_found_fmt,
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found_fmt,
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});
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defer b.allocator.free(cmd);
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// std.debug.print("{s}\n", .{cmd});
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deploy_step.dependOn(package_step);
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deploy_step.dependOn(&b.addSystemCommand(&.{ "/bin/sh", "-c", cmd }).step);
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// TODO: Looks like IquanaTLS isn't playing nicely with payloads this small
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// const payload = b.option([]const u8, "payload", "Lambda payload [{\"foo\":\"bar\"}]") orelse
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// \\ {"foo": "bar"}"
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// ;
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const payload = b.option([]const u8, "payload", "Lambda payload [{\"foo\":\"bar\", \"baz\": \"qux\"}]") orelse
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\\ {"foo": "bar", "baz": "qux"}"
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;
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const run_script =
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\\ f=$(mktemp) && \
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\\ logs=$(aws lambda invoke \
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\\ --cli-binary-format raw-in-base64-out \
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\\ --invocation-type RequestResponse \
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\\ --function-name {s} \
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\\ --payload '{s}' \
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\\ --log-type Tail \
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\\ --query LogResult \
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\\ --output text "$f" |base64 -d) && \
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\\ cat "$f" && rm "$f" && \
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\\ echo && echo && echo "$logs"
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;
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const run_script_fmt = try std.fmt.allocPrint(b.allocator, run_script, .{ function_name, payload });
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defer b.allocator.free(run_script_fmt);
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const run_cmd = b.addSystemCommand(&.{ "/bin/sh", "-c", run_script_fmt });
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run_cmd.step.dependOn(deploy_step);
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if (b.args) |args| {
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run_cmd.addArgs(args);
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}
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const run_step = b.step("remoterun", "Run the app in AWS lambda");
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run_step.dependOn(&run_cmd.step);
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}
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