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merge changes made in universal lambda (namespacing/iam refactor)
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This commit is contained in:
Emil Lerch 2024-05-06 11:14:24 -07:00
parent e0307704e1
commit 26d97f2fec
Signed by: lobo
GPG Key ID: A7B62D657EF764F8
2 changed files with 69 additions and 56 deletions
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7
build.zig
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@ -73,5 +73,10 @@ pub fn build(b: *std.Build) !void {
///
/// iam and package do not have any dependencies
pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
try @import("lambdabuild.zig").lambdaBuildOptions(b, exe);
const function_name = b.option([]const u8, "function-name", "Function name for Lambda [zig-fn]") orelse "zig-fn";
try @import("lambdabuild.zig").configureBuild(b, exe, function_name);
}
pub fn configureBuild(b: *std.Build, exe: *std.Build.Step.Compile, function_name: []const u8) !void {
try @import("lambdabuild.zig").configureBuild(b, exe, function_name);
}

110
lambdabuild.zig
View File

@ -14,23 +14,23 @@ fn addArgs(allocator: std.mem.Allocator, original: []const u8, args: [][]const u
return rc;
}
/// lambdaBuildOptions will add three build options to the build (if compiling
/// lambdaBuildSteps will add four build steps to the build (if compiling
/// the code on a Linux host):
///
/// * package: Packages the function for deployment to Lambda
/// * awslambda_package: Packages the function for deployment to Lambda
/// (dependencies are the zip executable and a shell)
/// * iam: Gets an IAM role for the Lambda function, and creates it if it does not exist
/// * awslambda_iam: Gets an IAM role for the Lambda function, and creates it if it does not exist
/// (dependencies are the AWS CLI, grep and a shell)
/// * deploy: Deploys the lambda function to a live AWS environment
/// * awslambda_deploy: Deploys the lambda function to a live AWS environment
/// (dependencies are the AWS CLI, and a shell)
/// * remoterun: Runs the lambda function in a live AWS environment
/// * awslambda_run: Runs the lambda function in a live AWS environment
/// (dependencies are the AWS CLI, and a shell)
///
/// remoterun depends on deploy
/// deploy depends on iam and package
/// awslambda_run depends on deploy
/// awslambda_deploy depends on iam and package
///
/// iam and package do not have any dependencies
pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
pub fn configureBuild(b: *std.Build, exe: *std.Build.Step.Compile, function_name: []const u8) !void {
// The rest of this function is currently reliant on the use of Linux
// system being used to build the lambda function
//
@ -41,7 +41,7 @@ pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
if (builtin.os.tag != .linux) return;
// Package step
const package_step = b.step("package", "Package the function");
const package_step = b.step("awslambda_package", "Package the function");
const function_zip = b.getInstallPath(.bin, "function.zip");
// TODO: Avoid use of system-installed zip, maybe using something like
@ -73,61 +73,73 @@ pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
package_step.dependOn(&zip_cmd.step);
// Deployment
const deploy_step = b.step("deploy", "Deploy the function");
var deal_with_iam = true;
if (b.args) |args| {
for (args) |arg| {
if (std.mem.eql(u8, "--role", arg)) {
deal_with_iam = false;
break;
}
}
}
const deploy_step = b.step("awslambda_deploy", "Deploy the function");
// TODO: Allow custom lambda role names
var iam_role: []u8 = &.{};
const iam_step = b.step("iam", "Create/Get IAM role for function");
const iam_role_name = b.option(
[]const u8,
"function-role",
"IAM role name for function (will create if it does not exist) [lambda_basic_execution]",
) orelse "lambda_basic_execution";
const iam_role_arn = b.option(
[]const u8,
"function-arn",
"Preexisting IAM role arn for function",
);
const iam_step = b.step("awslambda_iam", "Create/Get IAM role for function");
deploy_step.dependOn(iam_step); // iam_step will either be a noop or all the stuff below
if (deal_with_iam) {
// if someone adds '-- --role arn...' to the command line, we don't
// need to do anything with the iam role. Otherwise, we'll create/
// get the IAM role and stick the name in a file in our destination
// directory to be used later
const iam_role_name_file = b.getInstallPath(.bin, "iam_role_name");
iam_role = try std.fmt.allocPrint(b.allocator, "--role $(cat {s})", .{iam_role_name_file});
// defer b.allocator.free(iam_role);
if (!fileExists(iam_role_name_file)) {
// Role get/creation command
const iam_role_param: []u8 = blk: {
if (iam_role_arn != null)
break :blk try std.fmt.allocPrint(b.allocator, "--role {s}", .{iam_role_arn.?});
if (iam_role_name.len == 0)
@panic("Either function-role or function-arn must be specified. function-arn will allow deployment without creating a role");
// Now we have an iam role name to use, but no iam role arn. Let's go hunting
// Once this is done once, we'll have a file with the arn in "cache"
// The iam arn will reside in an 'iam_role' file in the bin directory
// Build system command to create the role if necessary and get the role arn
const iam_role_file = b.getInstallPath(.bin, "iam_role");
if (!fileExists(iam_role_file)) {
// std.debug.print("file does not exist", .{});
// Our cache file does not exist on disk, so we'll create/get the role
// arn using the AWS CLI and dump to disk here
const ifstatement_fmt =
\\ 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 '{
\\ if aws iam get-role --role-name {s} 2>&1 |grep -q NoSuchEntity; then aws iam create-role --output text --query Role.Arn --role-name {s} --assume-role-policy-document '{{
\\ "Version": "2012-10-17",
\\ "Statement": [
\\ {
\\ {{
\\ "Sid": "",
\\ "Effect": "Allow",
\\ "Principal": {
\\ "Principal": {{
\\ "Service": "lambda.amazonaws.com"
\\ },
\\ }},
\\ "Action": "sts:AssumeRole"
\\ }
\\ ]}' > /dev/null; fi && \
\\ }}
\\ ]}}' > /dev/null; fi && \
\\ aws iam attach-role-policy --policy-arn arn:aws:iam::aws:policy/AWSLambdaExecute --role-name lambda_basic_execution && \
\\ aws iam get-role --role-name lambda_basic_execution --query Role.Arn --output text >
\\ aws iam get-role --role-name lambda_basic_execution --query Role.Arn --output text > {s}
;
const ifstatement = try std.mem.concat(b.allocator, u8, &[_][]const u8{ ifstatement_fmt, iam_role_name_file });
defer b.allocator.free(ifstatement);
const ifstatement = try std.fmt.allocPrint(
b.allocator,
ifstatement_fmt,
.{ iam_role_name, iam_role_name, iam_role_file },
);
iam_step.dependOn(&b.addSystemCommand(&.{ "/bin/sh", "-c", ifstatement }).step);
}
}
const function_name = b.option([]const u8, "function-name", "Function name for Lambda [zig-fn]") orelse "zig-fn";
break :blk try std.fmt.allocPrint(b.allocator, "--role \"$(cat {s})\"", .{iam_role_file});
};
const function_name_file = b.getInstallPath(.bin, function_name);
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";
// The architectures option was introduced in 2.2.43 released 2021-10-01
// We want to use arm64 here because it is both faster and cheaper for most
// Amazon Linux 2 is the only arm64 supported option
// TODO: This should determine compilation target and use x86_64 if needed
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}";
const not_found_fmt = try std.fmt.allocPrint(b.allocator, not_found, .{ function_name, function_zip, iam_role, function_name_file });
const not_found_fmt = try std.fmt.allocPrint(b.allocator, not_found, .{ function_name, function_zip, iam_role_param, function_name_file });
defer b.allocator.free(not_found_fmt);
const found = "aws lambda update-function-code --function-name {s} --zip-file fileb://{s} && touch {s}";
const found_fmt = try std.fmt.allocPrint(b.allocator, found, .{ function_name, function_zip, function_name_file });
@ -143,7 +155,7 @@ pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
}
const cmd = try std.fmt.allocPrint(b.allocator, ifstatement, .{
function_name_file,
std.fs.path.dirname(exe.root_module.root_source_file.?.path).?,
b.getInstallPath(.bin, exe.out_filename),
function_name_file,
function_name,
not_found_fmt,
@ -156,10 +168,6 @@ pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
deploy_step.dependOn(package_step);
deploy_step.dependOn(&b.addSystemCommand(&.{ "/bin/sh", "-c", cmd }).step);
// TODO: Looks like IquanaTLS isn't playing nicely with payloads this small
// const payload = b.option([]const u8, "payload", "Lambda payload [{\"foo\":\"bar\"}]") orelse
// \\ {"foo": "bar"}"
// ;
const payload = b.option([]const u8, "payload", "Lambda payload [{\"foo\":\"bar\", \"baz\": \"qux\"}]") orelse
\\ {"foo": "bar", "baz": "qux"}"
;
@ -185,6 +193,6 @@ pub fn lambdaBuildOptions(b: *std.Build, exe: *std.Build.Step.Compile) !void {
run_cmd.addArgs(args);
}
const run_step = b.step("remoterun", "Run the app in AWS lambda");
const run_step = b.step("awslambda_run", "Run the app in AWS lambda");
run_step.dependOn(&run_cmd.step);
}