From be72c5109ad0793e8d0f7cdece6002b716a57a35 Mon Sep 17 00:00:00 2001
From: Erik Arvstedt <erik.arvstedt@gmail.com>
Date: Wed, 13 Jul 2022 12:44:33 +0200
Subject: [PATCH] backend: Create npm script `package`

This script creates a directory `backend/package` which only contains the
files required by the backend at runtime:
- The contents of `dist`
- `node_modules` minus `typescript` and `@typescript-eslint`.
  These packages are build-only and are larger than the remaining whole package.

By using only `backend/package` in the Docker image,
the backend content size in the image is decreased by 70% to 31M.
This, along with the improved copying in the Dockerfile, reduces the
backend image size by 44% to 200M.
(Step `RUN chown -R 1000:1000 /backend ...` created a layer that effectively
duplicated the backend.)
---
 backend/package.json          |  2 ++
 docker/backend/Dockerfile     | 11 ++++-------
 docker/backend/start.sh       |  2 +-
 docker/backend/wait-for-it.sh |  0
 4 files changed, 7 insertions(+), 8 deletions(-)
 mode change 100644 => 100755 docker/backend/start.sh
 mode change 100644 => 100755 docker/backend/wait-for-it.sh

diff --git a/backend/package.json b/backend/package.json
index 1ba4a8554..3cd05e8ab 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -24,6 +24,8 @@
     "tsc": "./node_modules/typescript/bin/tsc -p tsconfig.build.json",
     "build": "npm run tsc && npm run create-resources",
     "create-resources": "cp ./src/tasks/price-feeds/mtgox-weekly.json ./dist/tasks && node dist/api/fetch-version.js",
+    "package": "npm run build && rm -rf package && mv dist package && mv node_modules package && npm run package-rm-build-deps",
+    "package-rm-build-deps": "(cd package/node_modules; rm -r typescript @typescript-eslint)",
     "start": "node --max-old-space-size=2048 dist/index.js",
     "start-production": "node --max-old-space-size=4096 dist/index.js",
     "test": "./node_modules/.bin/jest --coverage",
diff --git a/docker/backend/Dockerfile b/docker/backend/Dockerfile
index 8d13bc7f4..6b7e7ae19 100644
--- a/docker/backend/Dockerfile
+++ b/docker/backend/Dockerfile
@@ -9,18 +9,15 @@ COPY . .
 RUN apt-get update
 RUN apt-get install -y build-essential python3 pkg-config
 RUN npm install --omit=dev --omit=optional
-RUN npm run build
+RUN npm run package
 
 FROM node:16.16.0-buster-slim
 
 WORKDIR /backend
 
-COPY --from=builder /build/ .
-
-RUN chmod +x /backend/start.sh
-RUN chmod +x /backend/wait-for-it.sh
-
-RUN chown -R 1000:1000 /backend && chmod -R 755 /backend
+RUN chown 1000:1000 ./
+COPY --from=builder --chown=1000:1000 /build/package ./package/
+COPY --from=builder --chown=1000:1000 /build/mempool-config.json /build/start.sh /build/wait-for-it.sh ./
 
 USER 1000
 
diff --git a/docker/backend/start.sh b/docker/backend/start.sh
old mode 100644
new mode 100755
index 8e6a34013..ade739f1f
--- a/docker/backend/start.sh
+++ b/docker/backend/start.sh
@@ -205,4 +205,4 @@ sed -i "s!__LND_REST_API_URL__!${__LND_REST_API_URL__}!g" mempool-config.json
 # CLN
 sed -i "s!__CLN_SOCKET__!${__CLN_SOCKET__}!g" mempool-config.json
 
-node /backend/dist/index.js
+node /backend/package/index.js
diff --git a/docker/backend/wait-for-it.sh b/docker/backend/wait-for-it.sh
old mode 100644
new mode 100755