Fix #60

Basic policy

• Make a module of echo.rs in interledger-service-util crate
• Insert the service into node.rs

Must-learn Specs

• ilp-prepare.ts
• echo.ts

Brief Spec

• echo service responds to the address of the connector
• throws error when the data size of ILP packet is less than 17 bytes
  • 17 bytes = ECHOECHOECHOECHO + type(0)
• throws error when the data does not start with ECHOECHOECHOECHO

ILP Packet handling in ilp-connector

• index.ts
  • creates App and listen
• app.ts
  • createApp loads accounts from env or config, and adds it to Accounts
  • listen
    • adminApi.listen()
    • backend.connect()
    • middlewareManager.setup()
    • accounts.loadIlpAddress()
    • accounts.connect()
    • middlewareManager.startup()
• middleware-manager.ts
  • constructor adds BUILTIN_MIDDLEWARES
    • error-handler, throughput, etc...
    • error-handler is inserted first, and called first covering all the exceptions
  • setup adds plug-ins for each account, and sets up Pipelines
  • startup calls startup handlers of each account

memo

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