N2O is an embeddable message protocol loop library for WebSocket, HTTP, MQTT and TCP servers. It provides basic features, such as process management, virtual nodes ring for request processing, sessions, frame encoding, and unified API for external mq and caching services.
- Purpose: High performance protocol relay
- Endpoints: WebSockets, MQTT, TCP
- Codebase: 700 LOC (Erlang), 500 LOC (JavaScript)
- Dialyzer: REBAR, REBAR3, MAD, MIX
- Hosts: BANDIT, COWBOY, EMQ, MOCHIWEB, RING, TCP, UDP
- PubSub: GPROC, SYN, PG2
- Formatters: JSON, BERT, ASN.1
- Templates: DTL, NITRO
- Abstract Database Layer KVS: FS, MNESIA, ROCKSDB, RIAK, REDIS
- Business Processes: BPE (BPMN 2.0), SCM, ERP, CRM
- HTTP API: REST (proplist/JSON)
- ACTIVE Reloading: GNU/Linux, Windows, macOS
- Online Client Bank: BANK (8041)
- Instant Messaging: CHAT (8042)
- Product Lifecycle Management: PLM (8043)
N2O was created to bring clarity and sanity to software development. The distribution model is per file basis with ISC license.
The core modules provide OTP start and N2O entry point.
- n2o — N2O OTP Supervisor and Application
- n2o_pi — N2O Processes
- n2o_proto — N2O Loop
- n2o_ring — N2O Ring
N2O Loop is directly connected and ran inside context of WebSocket handler.
Usually in Erlang we use syn or gproc OTP message buses.
As such buses are optional in MQTT setup we include bus drivers in WebSocket package.
- n2o_ws — N2O WebSocket Virtual Node
- n2o_heart — PING protocol
- n2o_cowboy — COWBOY API
- n2o_gproc — GPROC bus backend
- n2o_syn — SYN bus backend
git clone git@github.com:synrc/sample && cd sample
rebar3 shell
open http://localhost:8001/app/login.htmN2O ships with 3 optional protocols.
- n2o_ftp — N2O File protocol
- n2o_heart — N2O Heart protocol
- nitro_n2o — Nitrogen Web Framework protocol
- bpe_n2o — Business Process Engine protocol
Formatters, Sessions, etc. Optional.
- n2o_bert — BERT encoder/decoder
- n2o_json — JSON encoder/decoder
- n2o_secret — AES/GCM-256 encoder/decoder
- n2o_session — ETS session storage