update doc

* COMMENT -*- mode: org -*-

#+Date: 2018-05-04

Time-stamp: <2018-05-10>

Time-stamp: <2018-05-11>

#+STARTUP: content

* notes                                                               :entry:

** 2018-05-09 how to release latest code on PyPI?

  env HOST=127.0.1.1 PORT=abc stack exec rd-api -- --host=127.0.0.1 --port=8060

  env WORKER=1 stack exec rd-api

  v1.1.1.0 all works.

  but I don't like the code in updateRDConfigFromEnvPure

  it's unpleasant code.

  error handling shouldn't be this complicated.

- check how other people handle env variable.

  - envparse, this is similar to ~/haskell/env-var-parser/

  - envy

    https://www.stackage.org/lts-10.3/package/envy-1.3.0.2

    based on the doc. I can see why updateRDConfigFromEnvPure is too

    complex. it is trying to do too many things.

    the applicative style should be used to create values.

    just find another way to do the merge on two value of the same type. or

    update the runParser to support it.

    envy also support infer env var from record field name, by using

    GHC.Generics. So you no longer need to write a parser.

    - check how envy works.

      ~/haskell/testing/handle-params/app/Main.hs

      TODO envy doesn't handle Bool well.

      only True is accepted as true.

      yes, true, on, 1 not accepted as true.

  - read-env-var, this is a simple wrapper on lookupEnv and

    Text.Read.readMaybe. Not what I need.

** 2018-05-05 utf-8 character not working well in path.

curl http://localhost:8082/rd/%E4%B8%AD%E6%96%87%E6%96%87%E4%BB%B6%E5%90%8D.rar

{"ok":true,"path":"中"}

I remember there are tools that can simulate packet loss.

policy in ovs can do it.

- 2018-05-11 tcp - Simulate delayed and dropped packets on Linux - Stack Overflow

  https://stackoverflow.com/questions/614795/simulate-delayed-and-dropped-packets-on-linux

  test this in vbox VM. stretch01

  see stretch01 daylog.

* done                                                                :entry:

** 2018-05-08 rd-api, allow serve static file without redis-server.

--disable-rd-api