uplook 1.1.1

什么？

一个固执己见的python模块，用于处理配置值，并支持 外部数据源。

怎么做？

uplook类接受任意数量的键/值。这些变量 作为常规对象属性存储和访问。类型值 <；<；dict>；>；可以以点格式访问。

值也可以是查找函数，方法是使用特殊语法：

    +-> The name of the funtion.  1 tilde means the function is a static lookup.
    |   2 tildes means a lookup is done every time the attribute is accessed.
    |
    |         +------------+------> An optional pair of values.  The first value is the <key>
    |         |         |           to lookup.  The second value is a default value to return
    |         |         |           in case the key lookup fails.
~~function("key", "default value")
                     |
                     |
                     +-> The default value can also be JSON.  In that case you should not use
                         quotes around the value.

实际示例如下：

>>>>u=UpLook(servers='~~consul("first", [])')

为此，您首先需要注册负责 正在检索数据。取决于查找所需值所需的内容 您可以为函数提供一个<；键>；值。

一个（愚蠢的）示例查找函数如下：

defshow_members(cluster_name):ifcluster_name=="first"return["one","two","three"]else:raiseException("Unknown cluster")>>>>u.registerLookup("consul",show_members)

访问值u.value.server将触发注册的lookup 函数并返回其值：

>>>>u.value.servers["one","two","three"]

当注册的函数返回异常时，将返回默认值：

>>>>u=UpLook(servers='~~consul("blahblahblah", [])')>>>>u.value.servers[]

备注

• 当执行查找函数失败且默认值为 已定义，不会引发错误并返回默认值。
• 当执行查找函数失败并且no默认值 定义引发错误。
• 当默认值在单引号或双引号之间时，将返回 真的。当默认值是not在引号之间时，它是 被认为是json。当json无效时，返回一个错误。

更多示例

>>>>fromuplookimportUpLook>>>>u=UpLook(one=1,two=2)>>>>uUpLook({'two':2,'one':1})>>>>u.value.one1

>>>>fromuplookimportUpLook>>>>u=UpLook(levels={"level1":{"level2":{"level3":"hello"}}})>>>>uUpLook({'levels':{'level1':{'level2':{'level3':'hello'}}}})>>>>u.value.levels.level1.level2.level3'hello'

>>>>fromuplookimportUpLook>>>>u=UpLook(one=1,two=2)>>>>uUpLook({'two':2,'one':1})>>>>data=u.get()>>>>data.one1

>>>>fromuplookimportUpLook>>>>u=UpLook(one=1,two=2)>>>>uUpLook({'two':2,'one':1})>>>>data=u.dump(){'two':2,'one':1}

>>>>fromuplookimportUpLook>>>>u=UpLook(one=1,two=2)>>>>uUpLook({'two':2,'one':1})>>>>forkey,valueinu.get():....print"key: %s, value: %s"%(key,value)....key:two,value:2key:one,value:1

外部查找值

fromuplookimportUpLookfromuplook.errorsimportNoSuchValuedefsomeLookupFunction(key):data={"value.number.one":"hi","value.number.two":"this","value.number.three":"is","value.number.four":"a","value.number.five":"silly","value.number.six":"demo"}try:returndata[key]exceptKeyError:raiseNoSuchValue("%s is an unknown value."%(key))defrandomInt(max):returnrandom.randint(0,max)

>>>instance=UpLook(static='~fubar("value.number.one", "unknown")',>>>dynamic='~~random(100)',>>>normal='hello')

>>>forfunctionininstance.listfunctions():printfunctionfubarrandom>>>

>>>instance.registerLookup("fubar",someLookupFunction)>>>instance.registerLookup("random",randomInt)

>>>printtest.value.statichi>>>printtest.value.statichi

>>>printtest.value.dynamic>>>81>>>printtest.value.dynamic>>>16