issues with example?

[DrYSG]

platform: windows 10 Dune: version 2.1.2 Cygwin: CYGWIN_NT-10.0 YSG4206 3.1.2(0.340/5/3) 2019-12-21 15:25 x86_64 Cygwin

$ git clone https://github.com/andreas/ocaml-graphql-server.git
$ cd ocaml-graphql-server
$ dune exec examples/server.exe
ocaml-crunch graphql-cohttp/src/assets.ml (exit 1)
(cd _build/default/graphql-cohttp/src && D:\cygwin64\home\ysg4206\.opam
\ocaml-variants.4.07.1+mingw64c\bin\ocaml-crunch.exe -m plain assets -o assets.m
l)
Generating assets.ml
ocaml-crunch: internal error, uncaught exception:
              End_of_file

[andreas]

Thanks for reporting this @DrYSG 😄 What version of crunch do you have installed? Check with:

opam info crunch

I suspect it could be an issue of portability with crunch. Could you please try the following and reply with the output (OCAMLRUNPARAM=b enables backtraces):

$ export OCAMLRUNPARAM=b
$ dune exec examples/server.exe

[DrYSG]

This might be OBE, I found the this project, which uses esy, and it builds fine:

https://github.com/anmonteiro/reason-graphql-fullstack

opam info crunch

$ opam info crunch

<><> crunch: information on all versions ><><><><><><><><><><><><><><><><><><><>
name         crunch
all-versions 1.0.1  1.1.0  1.1.1  1.1.2  1.2.0  1.2.1  1.2.2  1.2.3  1.3.0  1.4.0  1.4.1  2.0.0  2.1.0  2.2.0  3.0.0
             3.1.0  3.2.0

<><> Version-specific details <><><><><><><><><><><><><><><><><><><><><><><><><>
version       3.2.0
repository    default
url.src:      "https://github.com/mirage/ocaml-crunch/releases/download/v3.2.0/crunch-v3.2.0.tbz"
url.checksum:
          "sha256=0a1a4ebb86ab643dd193b5c0046e4d168c6e1cb41e6e5e5b6fbd3b7492e8c6de"
          "sha512=8666e4081c96b7e0820c621197cb02de2238ddc911e4e95f439c69a685a5791dd4f874ba1084f56c9b44d3d579b877b1ed1f7
b0421cd56d3f36ad39c669ee4eb"
homepage:     "https://github.com/mirage/ocaml-crunch"
bug-reports:  "https://github.com/mirage/ocaml-crunch/issues"
dev-repo:     "git+https://github.com/mirage/ocaml-crunch.git"
authors:      "Anil Madhavapeddy" "Thomas Gazagnaire" "Stefanie Schirmer" "Hannes Mehnert"
maintainer:   "MirageOS team"
license:      "ISC"
tags:         "org:mirage" "org:xapi-project"
depends:      "ocaml" {>= "4.05.0"}
              "cmdliner"
              "ptime"
              "dune" {>= "1.0"}
              "lwt" {with-test}
              "mirage-kv" {with-test & >= "3.0.0"}
              "mirage-kv-mem" {with-test & >= "3.0.0"}
conflicts:    "mirage-kv" {< "3.0.0"}
synopsis      Convert a filesystem into a static OCaml module
description   `ocaml-crunch` takes a directory of files and compiles them into a standalone
              OCaml module which serves the contents directly from memory.  This can be
              convenient for libraries that need a few embedded files (such as a web server)
              and do not want to deal with all the trouble of file configuration.

output with backtraces:

$ dune exec examples/server.exe
ocaml-crunch graphql-cohttp/src/assets.ml (exit 1)
(cd _build/default/graphql-cohttp/src && D:\cygwin64\home\ysg4206\.opam\ocaml-variants.4.07.1+mingw64c\bin\oca
ml-crunch.exe -m plain assets -o assets.ml)
Generating assets.ml
ocaml-crunch: internal error, uncaught exception:
              End_of_file
              Raised at file "buffer.ml", line 189, characters 18-35
              Called from file "src/crunch.ml", line 87, characters 2-33
              Called from file "src/crunch.ml", line 49, characters 30-54
              Called from file "src/crunch.ml", line 53, characters 17-25
              Called from file "list.ml", line 117, characters 24-34
              Called from file "src/main.ml", line 50, characters 4-113
              Called from file "cmdliner_term.ml", line 25, characters 19-24
              Called from file "cmdliner.ml", line 117, characters 32-39

ysg4206@YSG4206 /cygdrive/d/crime/ocaml-graphql-server

[emillon]

Since there's only one static file, it's pretty easy to use dune to generate assets.ml instead of crunch.

Can you try with the following branch:

git clone https://github.com/emillon/ocaml-graphql-server.git -b crunch-dune

If that fixes the problem I'll open a PR.

[DrYSG]

$ dune build
File "graphql-async/src/dune", line 7, characters 20-32:
7 |  (libraries graphql async_kernel))
                        ^^^^^^^^^^^^
Error: Library "async_kernel" not found.
Hint: try: dune external-lib-deps --missing @@default

ysg4206@YSG4206 /cygdrive/d/crime/ocaml-graphql-server
$ dune install
Error: The following <package>.install are missing:
- _build/default/graphql-async.install
Hint: try running: dune build @install

ysg4206@YSG4206 /cygdrive/d/crime/ocaml-graphql-server
$ dune build @install
File "graphql-async/src/dune", line 7, characters 20-32:
7 |  (libraries graphql async_kernel))
                        ^^^^^^^^^^^^
Error: Library "async_kernel" not found.
Hint: try: dune external-lib-deps --missing @install

ysg4206@YSG4206 /cygdrive/d/crime/ocaml-graphql-server
$ opam install async_kernel
[ERROR] No switch is currently set. Please use 'opam switch' to set or install
        a switch

ysg4206@YSG4206 /cygdrive/d/crime/ocaml-graphql-server
$

I removed the opam switch, since I tend to use esy, and the switch compiler with dune was causing issues.

[andreas]

@DrYSG Please try dune exec examples/server.exe instead of dune build et al 😄

[DrYSG]

Yes. that branch works fine. Thank you.

[DrYSG]

I spoke too soon.

$ dune clean

$ dune exec examples/server.exe
listening on http://localhost:8080/graphql
Unhandled exception: End_of_file
Unhandled exception: End_of_file
Unhandled exception: End_of_file
Unhandled exception: End_of_file