From Python to Go… and Back Again!.pdf

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1、FromPythontoGo,BenBangertMozillaOct14,2015MyPaththusFarFromPythontoGoPythonsince2004●WrotethefirstpartofPylons(Routes)in2005●MergedPylonswithrepoze.bfg->Pyramidin2010●Pyramidstillrocks!●MyworkatcompaniesinthistimewasinPython●StartedworkingatMozillain2011LifeatMozilla●FirstProject-Queuey○Not

2、ificationStorageSystematScale○Python+Cassandra○Neverused/deployed○Kazoosupportinglibwas!LifeatMozilla●SecondProject-heka○LearnedGoin2012○Go1.0justlaunched○Simple,fastlanguagetogetstartedin●OtherProjects○Pushsystem(firstprototypeinGo)●CurrentProject○PushSystem(continuingiterations)Goisawesom

3、e!●Simplelanguage●Niceconcurrencyprimitives●Fairlyconcisecode●MuchfasterthanPython●…andwhateverelsetheInternethassaidProblemsinGo-landGoroutineMemoryUse●Ver1.2○8kbstacksize(overoriginal4kb)○Expensiveforstandardsocketmodel■Onereader■OneWriter○RefactorPushtoonlyhavereadersperconn,poolofwriter

4、s●Ver1.4○2kbstacksize(withbettercontiguousstacksizingalgo)○Willrequirelargerefactorofcodetogobacktonewlyoptimalreader/writerperconn○RefactorstillmakessenseduetootherissuesfoundwithwriterpoolDebugging●Mosterrorsarebasicstrings(Add’tlintrospectionrequireserrorcastingtopullouterrors)●Basicstri

5、ngslackcontextoncall-stack●Manylibrariesusesimilarerrorstringsinmultipleplaces●Boilerplateforerrorhandlingistedious●Livedebuggingoptionattimewasgdb,notfun(godebugrecentlyavailablelookslikeagreatimprovement)GoroutineLeaks●Channelsareneat,butdangerous●Deadlockdetectordoesn’tspotgoroutineleaks

6、●Goexpertsstillcan’twriteleak-freecode●Goroutineleaksareannoyingtopin-down●AddingsuitableselectstatementsintroducesmoreboilerplateTesting●Everythingshouldbeaninterface!●Can’tmockanargumentunlessitsaninterface○Manylibrariesdon’tprovideinterfacesforcomplexstructs,soyougettofabricateacomplexin

7、terfacesothewholethingcanbemocked●Extensivesinterfacesneededallover,regardlessofappropriateness●Verylaborintensivetoachievehighdegreeoftesting(andmanyadditionalLoC)AReturntoPythonAquickPythonprototype….●Usedtwisted/Python2.7usingautobahnwebsocketlibrary●