lambda-zig/lambdabuild.zig

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const std = @import("std");
const builtin = @import("builtin");
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const Package = @import("lambdabuild/Package.zig");
const Iam = @import("lambdabuild/Iam.zig");
const Deploy = @import("lambdabuild/Deploy.zig");
const Invoke = @import("lambdabuild/Invoke.zig");
fn fileExists(file_name: []const u8) bool {
const file = std.fs.openFileAbsolute(file_name, .{}) catch return false;
defer file.close();
return true;
}
fn addArgs(allocator: std.mem.Allocator, original: []const u8, args: [][]const u8) ![]const u8 {
var rc = original;
for (args) |arg| {
rc = try std.mem.concat(allocator, u8, &.{ rc, " ", arg });
}
return rc;
}
/// lambdaBuildSteps will add four build steps to the build (if compiling
/// the code on a Linux host):
///
/// * awslambda_package: Packages the function for deployment to Lambda
/// (dependencies are the zip executable and a shell)
/// * 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)
/// * awslambda_deploy: Deploys the lambda function to a live AWS environment
/// (dependencies are the AWS CLI, and a shell)
/// * awslambda_run: Runs the lambda function in a live AWS environment
/// (dependencies are the AWS CLI, and a shell)
///
/// awslambda_run depends on deploy
/// awslambda_deploy depends on iam and package
///
/// iam and package do not have any dependencies
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
//
// It is likely that much of this will work on other Unix-like OSs, but
// we will work this out later
//
// TODO: support other host OSs
if (builtin.os.tag != .linux) return;
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@import("aws").aws.globalLogControl(.info, .warn, .info, false);
const package_step = Package.create(b, .{ .exe = exe });
const step = b.step("awslambda_package", "Package the function");
step.dependOn(&package_step.step);
package_step.step.dependOn(b.getInstallStep());
// Doing this will require that the aws dependency be added to the downstream
// build.zig.zon
// const lambdabuild = b.addExecutable(.{
// .name = "lambdabuild",
// .root_source_file = .{
// // we use cwd_relative here because we need to compile this relative
// // to whatever directory this file happens to be. That is likely
// // in a cache directory, not the base of the build.
// .cwd_relative = try std.fs.path.join(b.allocator, &[_][]const u8{
// std.fs.path.dirname(@src().file).?,
// "lambdabuild/src/main.zig",
// }),
// },
// .target = b.host,
// });
// const aws_dep = b.dependency("aws", .{
// .target = b.host,
// .optimize = lambdabuild.root_module.optimize orelse .Debug,
// });
// const aws_module = aws_dep.module("aws");
// lambdabuild.root_module.addImport("aws", aws_module);
//
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]",
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) orelse "lambda_basic_execution_blah2";
const iam_role_arn = b.option(
[]const u8,
"function-arn",
"Preexisting IAM role arn for function",
);
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const iam = Iam.create(b, .{
.role_name = iam_role_name,
.role_arn = iam_role_arn,
});
const iam_step = b.step("awslambda_iam", "Create/Get IAM role for function");
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iam_step.dependOn(&iam.step);
const region = try b.allocator.create(@import("lambdabuild/Region.zig"));
region.* = .{
.allocator = b.allocator,
.specified_region = b.option([]const u8, "region", "Region to use [default is autodetect from environment/config]"),
};
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// Deployment
const deploy = Deploy.create(b, .{
.name = function_name,
.arch = exe.root_module.resolved_target.?.result.cpu.arch,
.iam_step = iam,
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.package_step = package_step,
.region = region,
});
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const deploy_step = b.step("awslambda_deploy", "Deploy the function");
deploy_step.dependOn(&deploy.step);
const payload = b.option([]const u8, "payload", "Lambda payload [{\"foo\":\"bar\", \"baz\": \"qux\"}]") orelse
\\ {"foo": "bar", "baz": "qux"}"
;
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const invoke = Invoke.create(b, .{
.name = function_name,
.payload = payload,
.region = region,
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});
invoke.step.dependOn(&deploy.step);
const run_step = b.step("awslambda_run", "Run the app in AWS lambda");
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run_step.dependOn(&invoke.step);
}
// AWS_CONFIG_FILE (default is ~/.aws/config
// AWS_DEFAULT_REGION
fn findRegionFromSystem(allocator: std.mem.Allocator) ![]const u8 {
const env_map = try std.process.getEnvMap(allocator);
if (env_map.get("AWS_DEFAULT_REGION")) |r| return r;
const config_file_path = env_map.get("AWS_CONFIG_FILE") orelse
try std.fs.path.join(allocator, &[_][]const u8{
env_map.get("HOME") orelse env_map.get("USERPROFILE").?,
".aws",
"config",
});
const config_file = try std.fs.openFileAbsolute(config_file_path, .{});
defer config_file.close();
const config_bytes = try config_file.readToEndAlloc(allocator, 1024 * 1024);
const profile = env_map.get("AWS_PROFILE") orelse "default";
var line_iterator = std.mem.split(u8, config_bytes, "\n");
var in_profile = false;
while (line_iterator.next()) |line| {
const trimmed = std.mem.trim(u8, line, " \t\r");
if (trimmed.len == 0 or trimmed[0] == '#') continue;
if (!in_profile) {
if (trimmed[0] == '[' and trimmed[trimmed.len - 1] == ']') {
// this is a profile directive!
// std.debug.print("profile: {s}, in file: {s}\n", .{ profile, trimmed[1 .. trimmed.len - 1] });
if (std.mem.eql(u8, profile, trimmed[1 .. trimmed.len - 1])) {
in_profile = true;
}
}
continue; // we're only looking for a profile at this point
}
// look for our region directive
if (trimmed[0] == '[' and trimmed[trimmed.len - 1] == ']')
return error.RegionNotFound; // we've hit another profile without getting our region
if (!std.mem.startsWith(u8, trimmed, "region")) continue;
var equalityiterator = std.mem.split(u8, trimmed, "=");
_ = equalityiterator.next() orelse return error.RegionNotFound;
const raw_val = equalityiterator.next() orelse return error.RegionNotFound;
return try allocator.dupe(u8, std.mem.trimLeft(u8, raw_val, " \t"));
}
return error.RegionNotFound;
}