ocaml-aws

ocaml-aws is an Amazon Web Services SDK for OCaml. Its source distribution includes a core runtime API and a code generation tool that generates individual libraries from botocore service descriptions.

Development

You can install the core library and its dependencies by pinning:

opam pin add aws .

After pinning, you can install to the latest development version by checking out the commit and running:

opam update aws

Code Generation

To generate service libaries during development and in preparation for release, first configure the build to enable code generation and run the gen target of the Makefile. Note that the code generation tool has its own set of dependencies that must be installed in order for the build to succeed. In addition, the Makefile is written for GNU make. Some platforms such as OS X and FreeBSD do not have a GNU-compatible make installed by default. If you get strage error messages at this stage of the build, check your make. The following commands will configure the build for code generation and regenerate the libraries from the current definitions:

# Compile code generator
make gen

# Compile generated libraries
make

Release

To generate a release to opam requires dune-release to be installed, then run:

make opam-release

Example

Here's how you use the library and EC2 bindings to retrieve a list of regions from AWS and print them to stdout. This example uses the Async runtime, but the equivalent lwt example is identical in structure.

open Async.Std
open Core.Std
open Aws_ec2

let to_result = function
  | `Ok x    -> Result.Ok x
  | `Error e -> Result.Error (Aws.Error.format Errors.to_string e)

let main () =
  Aws_async.Runtime.run_request
    ~region:"us-east-1" ~access_key:"<...>" ~secret_key:"<...>"
    (module DescribeRegions)
    (Types.DescribeRegionsRequest.make ())
  >>| to_result >>| Option.value_exn
  >>|? List.iter ~f:(fun x -> Printf.printf "%s\n%!" x.Types.Region.region_name)
  >>> function
    | Result.Ok ()   -> exit 0
    | Result.Error e -> Printf.eprintf "%s\n%!" e; exit 1
;;

Scheduler.go_main ~main ()

FreeBSD

In order to install the library dependencies—specifically zarith which is a transitive dependency of nocrypto—you must first make the following modifications to your system and environment:

# zarith asusmes an installation of gcc
sudo ln /usr/bin/cc /usr/local/bin/gcc

# libgmp-associated files are installed in /usr/local, which is not in the
# default search path for clang.
export CLFAGS=-I/usr/local/include
export LDFLAGS=-L/usr/local/lib

License

BSD3, see LICENSE file for its text.