Heroku もかつては使えなかった WebSocket。Deis も v1 の最初期は使えなかったようだが、比較的早い時期にパッチが当たったらしい¹。

さて、Deis は v2 になって、下層が Fleet から K8s へ変更になった。
しかし、PaaS を構成するコンテナ群には大きな変更はなく、同様に WebSocket 対応されているはず。
でも、未確認で作業を始めたあとに「実は未対応でした」となると手戻りが大きいので、試してみる。

結論から言うと、対応している。

作業ログは下記の通り。
(Heroku で Websockets with Node.js をはじめるためのメモを参考にした。)

$ git clone https://github.com/heroku-examples/node-ws-test.git
Cloning into 'node-ws-test'...
remote: Counting objects: 41, done.
remote: Total 41 (delta 0), reused 0 (delta 0), pack-reused 41
Unpacking objects: 100% (41/41), done.
Checking connectivity... done.

$ cd node-ws-test/

$ deis create node-ws-test
Creating Application... done, created node-ws-test
Git remote deis added
remote available at ssh://git@deis-builder.deis.mo*****:2222/node-ws-test.git

$ git add .

$ git commit -m "Ready to deploy"
On branch master
Your branch is up-to-date with 'origin/master'.

nothing to commit, working directory clean

$ git push deis master
Counting objects: 41, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (39/39), done.
Writing objects: 100% (41/41), 5.24 KiB | 0 bytes/s, done.
Total 41 (delta 17), reused 0 (delta 0)
Starting build... but first, coffee!
-----> Node.js app detected

-----> Creating runtime environment

       NPM_CONFIG_LOGLEVEL=error
       NPM_CONFIG_PRODUCTION=true
       NODE_ENV=production
       NODE_MODULES_CACHE=true

-----> Installing binaries
       engines.node (package.json):  0.10.x
       engines.npm (package.json):   unspecified (use default)

       Resolving node version 0.10.x via semver.io...
       Downloading and installing node 0.10.46...
       Using default npm version: 2.15.1

-----> Restoring cache
       Skipping cache restore (new runtime signature)

-----> Building dependencies
       Pruning any extraneous modules
       Installing node modules (package.json)

       > ws@0.4.32 install /tmp/build/node_modules/ws
       > (node-gyp rebuild 2> builderror.log) || (exit 0)

       make: Entering directory `/tmp/build/node_modules/ws/build'
       CXX(target) Release/obj.target/bufferutil/src/bufferutil.o
       SOLINK_MODULE(target) Release/obj.target/bufferutil.node
       COPY Release/bufferutil.node
       CXX(target) Release/obj.target/validation/src/validation.o
       SOLINK_MODULE(target) Release/obj.target/validation.node
       COPY Release/validation.node
       make: Leaving directory `/tmp/build/node_modules/ws/build'
       express@4.14.0 node_modules/express
       ├── escape-html@1.0.3
       ├── array-flatten@1.1.1
       ├── utils-merge@1.0.0
       ├── cookie-signature@1.0.6
       ├── merge-descriptors@1.0.1
       ├── methods@1.1.2
       ├── fresh@0.3.0
       ├── path-to-regexp@0.1.7
       ├── vary@1.1.0
       ├── encodeurl@1.0.1
       ├── range-parser@1.2.0
       ├── parseurl@1.3.1
       ├── content-type@1.0.2
       ├── etag@1.7.0
       ├── cookie@0.3.1
       ├── content-disposition@0.5.1
       ├── serve-static@1.11.1
       ├── depd@1.1.0
       ├── qs@6.2.0
       ├── on-finished@2.3.0 (ee-first@1.1.1)
       ├── finalhandler@0.5.0 (unpipe@1.0.0, statuses@1.3.0)
       ├── debug@2.2.0 (ms@0.7.1)
       ├── proxy-addr@1.1.2 (forwarded@0.1.0, ipaddr.js@1.1.1)
       ├── send@0.14.1 (destroy@1.0.4, ms@0.7.1, statuses@1.3.0, mime@1.3.4, http-errors@1.5.0)
       ├── accepts@1.3.3 (negotiator@0.6.1, mime-types@2.1.11)
       └── type-is@1.6.13 (media-typer@0.3.0, mime-types@2.1.11)

       ws@0.4.32 node_modules/ws
       ├── tinycolor@0.0.1
       ├── commander@2.1.0
       ├── options@0.0.6
       └── nan@1.0.0

-----> Caching build
       Clearing previous node cache
       Saving 2 cacheDirectories (default):
       - node_modules
       - bower_components (nothing to cache)

-----> Build succeeded!
       ├── express@4.14.0
       └── ws@0.4.32

-----> Discovering process types
       Default process types for Node.js -> web
-----> Compiled slug size is 7.3M
Build complete.
Launching App...
...
...
...
...
Done, node-ws-test:v2 deployed to Deis

Use 'deis open' to view this application in your browser

To learn more, use 'deis help' or visit https://deis.com/

To ssh://git@deis-builder.deis.mo*****:2222/node-ws-test.git
 * [new branch]      master -> master

$

Deis v1 での動作は未確認。 ↩