golang context 讓程式變髒了

為了解決goroutine間(特別是多層樹狀)取消( cancelation )
在 go 1.7 提供了 context standard library。
https://blog.golang.org/context

雖然提供了方便簡潔的操控goroutine的取消方法，並利用channel自動的通知取消給所有子執行緒。以及讓整顆樹的goroutine都能共享資料。

但官方希望我們不要二次封裝 context，而採用參數方式傳到每一個相關的function裡，連變數名稱都幫我們想好( ctx )，而且還建議放第一個參數。
這.... ，說真的，我不太能接受。

我們原本優雅的程式，讓這 ctx 污了整個code。

func doSomething(...interface{}) {
...
}

硬生生要變成這樣...

func doSomething(ctx context.Context, ...interface{}) {
...
   ctx.Done()
}

context 讓程式變髒了，就為了執行 ctx.Done()，ctx.Value(key)

@@

其實在讀完context的原始碼後，大概能理解原由。
雖然context source code寫得相當精要傳神，但個人認為其還是有許多的改善空間。

golang sqlbuilder

https://github.com/eehsiao/sqlbuilder

sqlbuilder

sqlbuilder is a simple sql query string builder

sqlbuilder its recursive struct call, that you can easy to build sql string

ex: dao.Select().From().Join().Where().Limit()

SqlBuilder functions

• build select :
  • Select(f ...string)
    • f is a fileds list of strings
    • Select("filed1", "filed2", "filed3")
    • Select(lib.Struce4QuerySlice(DaoStructType)...)
      • the library ref : https://github.com/eehsiao/go-models-lib
  • Distinct(b bool)
    • its default in builder is set false
  • Top(i int)
    • only support mssql
  • From(t ...string)
    • t is table name
  • Where(c string)
    • c is condition, ex Where("field1=1 and filed2='b'")
  • WhereAnd(c ...string)
  • WhereOr(c ...string)
  • Limit(i ...int)
    • support 2 parms
    • only support mysql
  • Join(t string, c string)
    • t is table name
    • c is condition
  • InnerJoin(t string, c string)
  • LeftJoin(t string, c string)
  • RightJoin(t string, c string)
  • FullJoin(t string, c string)
  • GroupBy(f ...string)
    • f is a fileds list of strings
  • OrderBy(f ...string)
    • f is a fileds list of strings
  • OrderByAsc(f ...string)
  • OrderByDesc(f ...string)
  • Having(s string)
    • s is having condition string
  • BuildSelectSQL()
    • check and build sql string.
    • you can get sql string via BuildedSQL()
• build update :
  • Set(s map[string]interface{})
  • FromOne(t string)
    • reset the table for only one
  • BuildUpdateSQL()
    • check and build sql string.
    • you can get sql string via BuildedSQL()
• build insert :
  • Into(t string)
    • set the insert table
  • Fields(f ...string)
    • f is a fileds list of strings
  • Values(v ...[]interface{})
    • v is a values list of interface{}
  • BuildInsertSQL()
    • check and build sql string.
    • you can get sql string via BuildedSQL()
• build delete :
  • BuildDeleteSQL()
    • check and build sql string.
    • you can get sql string via BuildedSQL()
• common :
  • ClearBuilder()
    • reset builder
  • BuildedSQL()
    • return the builded sql string, if build success.
  • SetDbName(s string)
  • SetTbName(s string)
  • SwitchPanicToErrorLog(b bool)
  • PanicOrErrorLog(s string)

Inter-Process Communication via websocket (golang)

github : https://github.com/eehsiao/websocket-ipc

websocket-ipc

Inter-Process Communication via websocket

how to be a deamon

install : install into service start : run as a deamon

sudo ./example install
sudo ./example start

how to stop deamon

when the deamon start

sudo ./example stop

how to remove deamon

when the deamon stop

sudo ./example remove

how to Communication

when the deamon start

sudo ./example {any string otherwise commands}