Go Programming Blueprints reading notes (talked about NSQ/MGO processing data persistence, but the business logic is not complex enough)

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Go Programming Blueprints

2. http. Handle ("/", &templatehandler{filename: "chat.html"});
   1. http. Handle static method?
   2. function object parameters with parameters? It's an ordinary struct--. Why don't you need new?
4. Go get Github.com/gorilla/websocket (Easy package dependent management!) ）
6. Go statement not required; end of Tag
8. TDD: Assuming that a type struct is already present before it is defined?
10. Control Flow: This is similar to Swift,if/for no need to add ()
12. Initialization/Assignment (: =) vs (<-) Chan stream as output right input (to left can be considered a unit operation?) ）
14. Special syntax for the map type: Map[keytype]valuetype---you can only think that the map in go is treated as a built-in type
    1. Therefore, it is not necessary to define the Equals/hashcode method of the Key object class like Java, but also to implement the Map container class as a template library (non-language feature).
    2. Can Chan type also be considered as such?
    3. Put Chan/map in front of the type, a bit of Haskell style?
16. What Chan can think of as a conduit for message communication between go routine? Must the same type be said in each of the Chan's messages?
    1. The definition within the struct is join Chan *client, but is used for {select {case client: = <-r.join: ...}}, the programming style is too weird.
       1. Can only think of the * in go inside the pointer type, should be understood as a reference? and access its members using. Instead of
       2. The for-select here seems to draw on the idiomatic approach of Erlang
    2. Create Chan:make (chan []byte)//not called New call make~
18. Any parameter: a ... interface{}
20. Define a (Member) method for a struct? It feels like a objective-c.
22. Certification: Handler wrapper (design mode)
24. Processing file uploads: filename, header, err: = req. Formfile ("Avatarfile")//where is the file saved? Multipart. File interface type?
    1. Data, err: = Ioutil. ReadAll (file)
    2. The more generic the interface, the better-but does the standard library ensure that all the common ones are defined?
26. Net/http the file server that is built into the package:
    1. http. Handle ("/avatars/", http. Stripprefix ("/avatars/", http. Fileserver (http. Dir ("./avatars"))))
28. Bufio
    1. S: = Bufio. Newscanner (OS. Stdin)//may be scanned using regular expressions?
    2. For S.scan () {...}//Let me always think of the Java StringTokenizer class
30. OS/EXEC: Connecting multiple processes with pipelines
    1. Exec.Command:nextCmd.Stdin = Thiscmd.stdoutpipe (), then call the start () method of the Cmd object and Wait ()
32. NSQ
    1. Install driver: Go get github.com/bitly/go-nsq
    2. Install MongoDB driver: Go get gopkg.in/mgo.v2
       1. Mongod--dbpath./db
       2. ITER: = db. DB ("ballots"). C ("polls"). Find (nil). Iter ()
34. TCP Long connections
    1. NETC, err: = Net. Dialtimeout (NETW, addr, 5*time. Second)//go The name of the real TM heck, dial?
    2. HttpClient = &http. client{

       Transport: &http. transport{

       dial:dial,//Use the custom Dial method (? )

       },}

36. Environment variables: ' env: ' sp_twitter_key,required '
38. Fmt. Println (reflect. TypeOf(struct{}{}). Size ())//=0
40. Stopchan <-chan struct{}//Only accepted channel? This syntax is so weird that the operator can be part of a type signature
42. Capturing OS Signals
    1. Termchan: = Make (chan os. Signal, 1)
    2. Signal. Notify (Termchan, Syscall. SIGINT, Syscall. SIGTERM, Syscall. SIGHUP)
44. Implementing RESTful APIs
    1. var vars map[*http. request]map[string]interface{}
    2. var varslock sync. Rwmutex//go The use of read-write locks inside, performance is not a problem?
    3. See also Wrapper:func Withapikey (fn http. Handlerfunc) http. Handlerfunc {...//the high-order function has been used here (Python adorner?). ）
       1. Withcors (Withvars (withdata (DB, Withapikey (handlepolls))))
46. The facade interface exposes a single public method, which would return the public view of a struct
48. Q.lat, _ = StrConv. Parsefloat (req. Url. Query (). Get ("Lat"), 64)//library API designed to be concise
50. var ZIP archiver = (*zipper) (nil)//compiler performs interface type consistency check
    1. var _ Interface = (*implementation) (nil)
    2. If err: = os. Mkdirall(filepath. Dir (dest), 0777); Err! = Nil {...
    3. Dirhash: Essentially converting a directory to a key string object, using a comparison of strings instead of a comparison of the directory attributes (decoupled)
52. Case <-Time. after (time. Duration (*interval) * time. Second): ...//hmm? Returns a channel that will send the specified timeout message
54. Gopath//equivalent to the repo concept in Maven, or Java_home?
    1. Go get code.google.com/p/go.tools/cmd/goimports//hmm? Why not built-in

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