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refactor iam

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This commit is contained in:
Emil Lerch 2023-09-18 14:46:54 -07:00
parent 1014f89d3d
commit 12c09b291d
Signed by: lobo
GPG key ID: A7B62D657EF764F8
1 changed files with 44 additions and 32 deletions
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76
src/lambdabuild.zig
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@ -74,52 +74,64 @@ pub fn configureBuild(b: *std.build.Builder, exe: *std.Build.Step.Compile) !void
// Deployment
const deploy_step = b.step("awslambda_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;
}
}
}
// TODO: Allow custom lambda role names
var iam_role: []u8 = &.{};
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";
var 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);
}
}
break :blk try std.fmt.allocPrint(b.allocator, "--role \"$(cat {s})\"", .{iam_role_file});
};
const function_name = b.option([]const u8, "function-name", "Function name for Lambda [zig-fn]") orelse "zig-fn";
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";