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Functions without FDK

Fn (OCI Functions) の Function を FDK を使わずに作成する方法

  • HTTP Server over Unix Domain Socket を実装する
  • POST /call で呼び出される、これをハンドルする
  • bind する ファイルのパスは環境変数 FN_LISTENER で渡される
    例: /tmp/iofs/lsnr.sock
    • 直接 bind せずに 指定されたパスと同一ディレクトリの別のファイル名で bind する
      例: /tmp/iofs/YvzDu6m9_lsnr.sock
    • このファイルに rw-rw-rw- のアクセス権限を設定する
    • これに相対パスのシンボリックリンクを張る
    • 結果、実行時にはこんなファイル構成となっている 
      $ ls -l /tmp/iofs
lrwxrwxrwx. 1 root root 17 Mar  3 17:45 lsnr.sock -> YvzDu6m9_lsnr.sock
srw-rw-rw-. 1 root root  0 Mar  3 17:45 YvzDu6m9_lsnr.sock

How to create an Fn (OCI Functions) Function without FDK

  • Implement HTTP Server over Unix Domain Socket
  • Handle POST /call
  • The file name to be bound is passed via the environment variable FN_LISTENER
    example: /tmp/iofs/lsnr.sock
    • Bind socket to another file which is different from ${FN_LISTENER} located in the same directory
      example: /tmp/iofs/YvzDu6m9_lsnr.sock
    • Set rw-rw-rw- permission to this file
    • Create a symbolic link named ${FN_LISTENER} which is linked to the bound file as a relative path
    • As a result, the placement of files is like this 
      $ ls -l /tmp/iofs
lrwxrwxrwx. 1 root root 17 Mar  3 17:45 lsnr.sock -> YvzDu6m9_lsnr.sock
srw-rw-rw-. 1 root root  0 Mar  3 17:45 YvzDu6m9_lsnr.sock

実装

つまり Unix Domain Socket に対応した HTTP Server フレームワークを使うのが手っ取り早い
ということで、今回は netty と reactor-netty で実装してみた

netty 使用時の実装 tips

  • netty は Unix Domain Socket を扱うための native library (.so) が必要で、デフォルトでは実行時にダイナミックにファイルを配置するようで、Dockerコンテナ内で動作させるとうまく動作しない模様
    → imageのビルド時に特定のディレクトリに native library を配置して、起動オプションで -Djava.library.path=xxx を指定することによってこの問題を回避した、本来はちゃんと原因追及するべき...
  • OCI Functions のメモリー量の指定に気をつける (128 では小さくて何も吐かずに勝手に落ちた)

ビルド & 実行

環境変数 mainClass は最初にセットしておく

# netty 版
$ export mainClass=org.example.netty.FnServer
# reactor-netty 版
$ export mainClass=org.example.reactor.FnServer

  • ローカルでビルド & 実行

    # build
$ mvn clean package

# run server
$ java -cp target/fn-netty.jar $mainClass

# call function
$ curl --unix-socket /tmp/fnlsnr.sock -X POST -d 'Hello World!' http:/call

  • Docker imageを作成 & 実行

    # build
$ docker build --build-arg mainClass=$mainClass -t fn-netty:0.0.1 .

# run server
$ docker run --rm -it --name fn-netty -v /tmp:/tmp fn-netty:0.0.1

# call function
$ curl --unix-socket /tmp/fnlsnr.sock -X POST -d 'Hello World!' http:/call

  • ローカル Fn Server で実行

    Fn CLIはインストール済みという前提で

    # start Fn server
$ fn start

# setup Fn CLI
$ fn use context default

# create app
$ fn create app funcapp

# deploy function
$ fn deploy -app funcapp --build-arg mainClass=$mainClass --local --no-bump -v

# call function
$ echo -n 'Hello World!' | fn invoke funcapp fn-netty

  • OCI Functions にデプロイ & 実行

    OCI Functionsで アプリケーション funcapp が作成されている前提で

    # setup Fn CLI
$ fn use context XXXXXX

# deploy function
$ fn deploy -app funcapp --build-arg mainClass=$mainClass --no-bump -v

# call functions
$ echo -n 'Hello World!' | fn invoke funcapp fn-netty

デモ

  • Local 環境

    $ curl --unix-socket /tmp/fnlsnr.sock -X POST -d 'Hello World!' http:/call
FN-NETTY (REACTOR) SERVER
===================================
VERSION: HTTP/1.1
HOSTNAME: http
REQUEST_URI: /call

HEADER: User-Agent = curl/7.29.0
HEADER: Host = http
HEADER: Accept = */*
HEADER: Content-Length = 12
HEADER: Content-Type = application/x-www-form-urlencoded

CONTENT: Hello World!
END OF CONTENT

  • Local Fn Server

    $ echo -n 'Hello World!' | fn invoke funcapp fn-netty
FN-NETTY (REACTOR) SERVER
===================================
VERSION: HTTP/1.1
HOSTNAME: localhost
REQUEST_URI: /call

HEADER: Host = localhost
HEADER: User-Agent = Go-http-client/1.1
HEADER: Transfer-Encoding = chunked
HEADER: Accept-Encoding = gzip
HEADER: Content-Type = text/plain
HEADER: Fn-Call-Id = 01F0MT4Q21NG8G00GZJ0000005
HEADER: Fn-Deadline = 2021-03-13T03:35:10Z

CONTENT: Hello World!
END OF CONTENT

  • OCI Functions (trace=ON)

    $ echo -n 'Hello World!' | fn invoke funcapp fn-netty
FN-NETTY (REACTOR) SERVER
===================================
VERSION: HTTP/1.1
HOSTNAME: localhost
REQUEST_URI: /call

HEADER: Host = localhost
HEADER: User-Agent = Go-http-client/1.1
HEADER: Transfer-Encoding = chunked
HEADER: Accept-Encoding = gzip
HEADER: Content-Type = application/json
HEADER: Date = Fri, 30 Jul 2021 20:53:55 GMT
HEADER: Fn-Call-Id = 01FBWK3SVZ1BT0H18ZJ000MVYQ
HEADER: Fn-Deadline = 2021-07-30T20:58:53Z
HEADER: Oci-Subject-Compartment-Id = ocid1.tenancy.oc1..xxxxxx
HEADER: Oci-Subject-Id = ocid1.user.oc1..xxxxxx
HEADER: Oci-Subject-Tenancy-Id = ocid1.tenancy.oc1..xxxxxx
HEADER: Oci-Subject-Type = user
HEADER: Opc-Compartment-Id = ocid1.compartment.oc1..xxxxxx
HEADER: Opc-Request-Id = /01FBWK3ST90000000000015JDG/01FBWK3ST90000000000015JDH
HEADER: X-B3-Spanid = 4d52a9209c1ea317
HEADER: X-B3-Traceid = 4d52a9209c1ea317
HEADER: X-Content-Sha256 = f4OxZX/x/FO5LcGBSKHWXfwtSx+j1ncoSt3SABJtkGk=

CONTENT: Hello World!
END OF CONTENT

    OCI Functions Content-Type: application/json になってる...

  • OCI API Gateway -> OCI Functions (trace=ON)

    $curl -X POST -d "[]" -H "Content-Type: application/json" \
  https://xxxxxx.apigateway.us-ashburn-1.oci.customer-oci.com/fn-netty/

FN-NETTY (REACTOR) SERVER
===================================
VERSION: HTTP/1.1
HOSTNAME: localhost
REQUEST_URI: /call

HEADER: Host = localhost
HEADER: User-Agent = lua-resty-http/0.14 (Lua) ngx_lua/10019
HEADER: Transfer-Encoding = chunked
HEADER: Content-Type = application/json
HEADER: Date = Fri, 30 Jul 2021 20:26:32 GMT
HEADER: Fn-Call-Id = 01FBWHHP481BT0J1GZJ000PM8T
HEADER: Fn-Deadline = 2021-07-30T20:31:43Z
HEADER: Fn-Http-H-Accept = */*
HEADER: Fn-Http-H-Cdn-Loop = fdJfCZhy618AGmi5huTgzQ
HEADER: Fn-Http-H-Content-Length = 2
HEADER: Fn-Http-H-Content-Type = application/json
HEADER: Fn-Http-H-Forwarded = for=xxx.xxx.xxx.xxx
HEADER: Fn-Http-H-Host = xxxxxx.apigateway.us-ashburn-1.oci.customer-oci.com
HEADER: Fn-Http-H-User-Agent = curl/7.29.0
HEADER: Fn-Http-H-X-Forwarded-For = xxx.xxx.xxx.xxx
HEADER: Fn-Http-H-X-Real-Ip = zzz.zzz.zzz.zzz
HEADER: Fn-Http-Method = POST
HEADER: Fn-Http-Request-Url = /fn-netty/
HEADER: Fn-Intent = httprequest
HEADER: Fn-Invoke-Type = sync
HEADER: Oci-Subject-Compartment-Id = ocid1.compartment.oc1..xxxxxx
HEADER: Oci-Subject-Id = ocid1.apigateway.oc1.iad.xxxxxx
HEADER: Oci-Subject-Tenancy-Id = ocid1.tenancy.oc1..xxxxxx
HEADER: Oci-Subject-Type = resource
HEADER: Opc-Request-Id = /6997BF9ED7E80B78B3834B7EB7054184/01FBWHHP3X0000000000019C89
HEADER: X-B3-Spanid = 5642ee33c9d0c82c
HEADER: X-B3-Traceid = 5642ee33c9d0c82c
HEADER: X-Content-Sha256 = T1PNoYwrqgwDVLtfmj7L5e0Sq02OEbqHPC8RFhICuUU=
HEADER: Accept-Encoding = gzip

CONTENT: []
END OF CONTENT

    Fn-Http-xxx でAPI Gatewayが受けっとったHTTPリクエストの内容が転送されているのが分かる

  • OCI API Gateway -> OCI Functions (trace=ON)
    Functions の config で PRINT_ENV=TRUE に設定して環境変数も出力

FN-NETTY (REACTOR) SERVER
===================================
ENV: FN_FN_NAME=fn-netty
ENV: PATH=/usr/local/openjdk-8/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
ENV: OCI_RESOURCE_PRINCIPAL_RPST=/.oci-credentials/rpst
ENV: JAVA_HOME=/usr/local/openjdk-8
ENV: FN_APP_ID=ocid1.fnapp.oc1.iad.xxxxxx
ENV: FN_CPUS=125m
ENV: LANG=C.UTF-8
ENV: OCI_TRACE_COLLECTOR_URL=https://xxxxxx.apm-agt.us-ashburn-1.oci.oraclecloud.com/20200101/observations/public-span?dataFormat=zipkin&dataFormatVersion=2&dataKey=xxxxxx
ENV: FN_MEMORY=256
ENV: FN_LOGFRAME_NAME=01FD180P0F0000000000001CGW
ENV: PRINT_ENV=true
ENV: JAVA_VERSION=8u282
ENV: FN_LOGFRAME_HDR=Opc-Request-Id
ENV: OCI_REGION_METADATA={"realmDomainComponent":"oraclecloud.com","realmKey":"oc1","regionIdentifier":"us-ashburn-1","regionKey":"IAD"}
ENV: FN_TYPE=sync
ENV: OCI_TRACING_ENABLED=1
ENV: OCI_RESOURCE_PRINCIPAL_VERSION=2.2
ENV: OCI_RESOURCE_PRINCIPAL_REGION=us-ashburn-1
ENV: OCI_RESOURCE_PRINCIPAL_PRIVATE_PEM=/.oci-credentials/private.pem
ENV: FN_FN_ID=ocid1.fnfunc.oc1.iad.xxxxxx
ENV: FN_APP_NAME=funcapp
ENV: HOSTNAME=308cc78a5d83
ENV: FN_FORMAT=http-stream
ENV: FN_LISTENER=unix:/tmp/iofs/lsnr.sock
ENV: HOME=/

VERSION: HTTP/1.1
HOSTNAME: localhost
REQUEST_URI: /call

HEADER: Host = localhost
HEADER: User-Agent = lua-resty-http/0.14 (Lua) ngx_lua/10019
HEADER: Transfer-Encoding = chunked
HEADER: Content-Type = application/json
HEADER: Date = Sat, 14 Aug 2021 02:34:49 GMT
HEADER: Fn-Call-Id = 01FD1862RF1BT0J4GZJ000TGF8
HEADER: Fn-Deadline = 2021-08-14T02:39:47Z
HEADER: Fn-Http-H-Accept = */*
HEADER: Fn-Http-H-Cdn-Loop = fdJfCZhy618AGmi5huTgzQ
HEADER: Fn-Http-H-Content-Length = 2
HEADER: Fn-Http-H-Content-Type = application/json
HEADER: Fn-Http-H-Forwarded = for=xxx.xxx.xxx.xxx
HEADER: Fn-Http-H-Host = xxxxxx.apigateway.us-ashburn-1.oci.customer-oci.com
HEADER: Fn-Http-H-User-Agent = curl/7.29.0
HEADER: Fn-Http-H-X-Forwarded-For = xxx.xxx.xxx.xxx
HEADER: Fn-Http-H-X-Real-Ip = zzz.zzz.zzz.zzz
HEADER: Fn-Http-Method = POST
HEADER: Fn-Http-Request-Url = /fn-netty/
HEADER: Fn-Intent = httprequest
HEADER: Fn-Invoke-Type = sync
HEADER: Oci-Subject-Compartment-Id = ocid1.compartment.oc1..xxxxxx
HEADER: Oci-Subject-Id = ocid1.apigateway.oc1.iad.xxxxxx
HEADER: Oci-Subject-Tenancy-Id = ocid1.tenancy.oc1..xxxxxx
HEADER: Oci-Subject-Type = resource
HEADER: Opc-Request-Id = /A22D916112C989A90997B447C703F90A/01FD1862QW000000000001G0XG
HEADER: X-B3-Spanid = 3ebf93f7eca825ec
HEADER: X-B3-Traceid = 3ebf93f7eca825ec
HEADER: X-Content-Sha256 = T1PNoYwrqgwDVLtfmj7L5e0Sq02OEbqHPC8RFhICuUU=
HEADER: Accept-Encoding = gzip

CONTENT: []
END OF CONTENT

ちなみに trace=OFF にすると、
ENV: OCI_TRACE_COLLECTOR_URL=
ENV: OCI_TRACING_ENABLED=0
となる