Split application orchestration by responsibility

tests/application-boundaries.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+for module in \
+  src/Nuthatch/Http/Server.hs \
+  src/Nuthatch/Http/Auth.hs \
+  src/Nuthatch/Browse.hs \
+  src/Nuthatch/Transfer.hs \
+  src/Nuthatch/Mutation/Service.hs \
+  src/Nuthatch/Mutation/Recovery.hs \
+  src/Nuthatch/Mutation/Effects.hs; do
+  test -f "$module"
+done
+
+test "$(wc -l <src/Nuthatch/App.hs)" -le 40
+
+if grep -Eq 'Servant|Nuthatch\.Http' \
+    src/Nuthatch/Mutation/Service.hs \
+    src/Nuthatch/Mutation/Recovery.hs \
+    src/Nuthatch/Mutation/Effects.hs; then
+  printf '%s\n' "Mutation protocol services depend on HTTP" >&2
+  exit 1
+fi
+
+grep -F 'Nuthatch.Mutation.Service' src/Nuthatch/Transfer.hs >/dev/null
+grep -F 'Nuthatch.Mutation.Service' src/Nuthatch/Http/Server.hs >/dev/null
+grep -F 'Nuthatch.Mutation.Service' src/Nuthatch/Mutation/Recovery.hs >/dev/null
+
+if grep -Eq 'recoverOnce|recoverOne|finalizeRecovered|observeObjectWithRetry' \
+    src/Nuthatch/App.hs src/Nuthatch/Http/*.hs; then
+  printf '%s\n' "Recovery implementation leaked into HTTP composition" >&2
+  exit 1
+fi
+
+printf '%s\n' "Application responsibility boundaries passed"