feat: add go

Makefile

@@ -1,7 +1,7 @@
 
 .PHONY: build prepare up all test
 
-up: 
+up: build 
 	docker compose up
 
 prepare:

evaluator/README.md

@@ -2,3 +2,14 @@
 
 Can be run with `cargo build` and `cargo run`. Do note that it currently
 requires root priviledges, since it edits cgroups.
+
+## Language nuances
+
+Some languages (their compilers or interpreters) have some nuances that need to be taken into account.
+
+### Go
+
+Go needs `GOCACHE` to be set to a folder.
+The compiler then caches some files there.
+
+For each Go version, we create a folder in `/opt/evaluator/compilers/go/<version>/.gocache` and run `go build std` for each version. The /opt/evaluator folder is mounted as RW volume, which is enough for the cache.

evaluator/config/config.yaml

@@ -88,3 +88,17 @@
   commands:
     - cp ${SOURCE_FILE} source.mjl
     - ${EXECUTOR} interpret source.mjl
+
+- name: go
+  compilers:
+  - name: 1.25.1
+    path: /opt/evaluator/compilers/go/1.25.1/bin/go
+  - name: 1.24.7
+    path: /opt/evaluator/compilers/go/1.24.7/bin/go
+  - name: 1.23.12
+    path: /opt/evaluator/compilers/go/1.23.12/bin/go
+  commands:
+    - cp ${SOURCE_FILE} source.go
+    - GOCACHE="/opt/evaluator/compilers/go/${COMPILER_NAME}/.gocache" ${COMPILER} build -o source ${COMPILER_ARGS} source.go
+    - rm source.go
+    - ./source ${SOURCE_ARGS}

evaluator/config/userspace.cfg

@@ -30,7 +30,7 @@ gidmap {
 detect_cgroupv2: true
 
 cgroup_mem_max: 1073741824 # 1GB
-cgroup_pids_max: 16 # Haskell needs at least this much.
+cgroup_pids_max: 256 # Before Go, 16 was enough...
 cgroup_cpu_ms_per_sec: 200
 
 # create dummy user, some programs (racket) need it

evaluator/infra/languages/config.toml

@@ -6,3 +6,6 @@ image = "rust:1.79-bookworm"
 
 [racket]
 image = "gcc:13.2-bookworm"
+
+[go]
+image = "debian:bookworm-slim"

evaluator/infra/languages/go/setup.sh

@@ -0,0 +1,22 @@
+#!/bin/bash -e
+
+apt-get update
+apt-get install -y wget
+
+COMPILERS_DIR="/opt/evaluator/compilers/go"
+
+setup_go_version() {
+    GO_VERSION=$1
+    echo "Setting up go version $GO_VERSION"
+    GO_FTP="https://go.dev/dl/go${GO_VERSION}.linux-amd64.tar.gz"
+    echo "Downloading $GO_FTP"
+    wget "${GO_FTP}"
+    tar -xzf "go${GO_VERSION}.linux-amd64.tar.gz"
+    mkdir -p "${COMPILERS_DIR}"
+    mv go "${COMPILERS_DIR}/${GO_VERSION}"
+    GOCACHE="${COMPILERS_DIR}/${GO_VERSION}/.gocache" "${COMPILERS_DIR}/${GO_VERSION}/bin/go" build -v std
+}
+
+setup_go_version "1.25.1"
+setup_go_version "1.24.7"
+setup_go_version "1.23.12"

evaluator/src/eval.rs

@@ -172,6 +172,7 @@ async fn execute(spec: &RunSpec, payload: &RequestPayload, eval_id: &str) -> Res
             .iter()
             .find(|c| c.name == *compiler)
             .with_context(|| format!("Compiler '{}' not found", compiler))?;
+        command = str::replace(&command, "${COMPILER_NAME}", &compiler_spec.name);
         let compiler_path = match &compiler_spec.path {
             Some(path) => path.to_owned(),
             None => format!("{}/{}/{}", *COMPILERS_PATH, spec.name, compiler_spec.name),

integration_tests/evaluator_tests/test_go.py

@@ -0,0 +1,22 @@
+import requests
+
+EVALUATOR_ADDRESS = "http://evaluator:7800/api/v1/evaluate"
+
+def generate_python(code: str):
+    return {"language": "go", "code": code, "compiler": "1.25.1"}
+
+def test_simple_python():
+    payload = generate_python("""
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("Hello, World!")
+}
+""")
+    response = requests.post(EVALUATOR_ADDRESS, json=payload, headers={"X-Forwarded-For": "1.1.1.1"})
+    assert response.status_code == 200
+    values = response.json()
+    assert values["stdout"] == "Hello, World!\n"
+    assert values["stderr"] == ""

website/src/lib/constants.ts

@@ -36,6 +36,13 @@ export const languages: { [key in LangKey]: ILanguage } = {
     text: "Bash",
     executors: ["bash-bookworm"],
   },
+  go: {
+    name: "go",
+    server_name: "go",
+    editor_name: "go",
+    text: "Go",
+    compilers: ["1.25.1", "1.24.7", "1.23.12"],
+  },
   c: {
     name: "c",
     server_name: "c",

website/src/lib/defaultPrograms.ts

@@ -45,6 +45,25 @@ export const defaultPrograms: IPrograms = {
     "print(fact(5))",
   ].join("\n"),
   shell: ["#!/bin/bash", "", "echo 'Hello, World!'"].join("\n"),
+  go: [
+    "package main",
+    "",
+    "import (",
+    '    "fmt"',
+    ")",
+    "",
+    "func fact(n int) int {",
+    "    if n == 0 {",
+    "        return 1",
+    "    } else {",
+    "        return n * fact(n - 1)",
+    "    }",
+    "}",
+    "",
+    "func main() {",
+    "    fmt.Println(fact(5))",
+    "}",
+  ].join("\n"),
   c: [
     "#include <stdio.h>",
     "",

website/src/lib/types.ts

@@ -41,6 +41,7 @@ export type LangKey =
   | "python3"
   | "racket"
   | "bash"
+  | "go"
   | "c"
   | "cpp"
   | "rust"