Simpler lambda invoke example with AWS SAM cli

[brainstorm]

Try to simplify the DX further by using SAM cli. TL;DR is:

$ aws sso login (or whatever way you have to load your AWS your creds)
(edit `event.json` to your liking)
$ cp ./target/x86_64-unknown-linux-musl/release/bootstrap .
$ sam local invoke -e event.json

Enjoy!

[andrewpatto]

How does foo bind to the right handler? Or is this value essentially unused for Rust?

[brainstorm]

That's a really good question! I guess that for the provided runtime the handler might not matter because it just goes straight to bootstrap and then that binary's ELF entrypoint (entry0?)... just guessing though and haven not tested deploy, just local invoke... perhaps it does matter in the former?

[brainstorm]

Right now it prints bytes instead of target_names... the to_hashmap() is giving me some headaches w/ serde and serialization... could you give it a quick peek at it @andrewpatto? Namely:

(base) rvalls@umccr s3-rust-htslib-bam % git diff
diff --git a/src/main.rs b/src/main.rs
index b9f54d1..e132432 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -34,7 +34,7 @@ async fn bam_header(event: Value, _: Context) -> Result<Value, Error> {

     // Get some lowlevel libcurl action on hfile_curl/s3 from htslib and fetch the header
     let bam = bam::Reader::from_url(&s3_url).unwrap();
-    let header = bam::Header::from_template(bam.header()).to_bytes();
+    let header = bam::Header::from_template(bam.header()).to_hashmap();

     // and return the array as a JSON object
     Ok(json!(header))

After that, this PR is totally mergeable and super easy to deploy, thanks a lot for all the effort and attention :)

[andrewpatto]

This is relatively simple and kind of at least gives the returned JSON object some structure thats meaningful

[andrewpatto]

There appears to be a bug in to_hashmap() for the CRAM files in the example (from a brief look I think the COmment lines are failing to match the expected format in the to_hashmap() regex)

"@co\tFASTQ=ERR009378_1.fastq.gz"

For the sake of the example I've just changed it to split the header by lines which should be fine as an example..

[brainstorm]

Thanks a ton for this @andrewpatto :)