gifs/api
2014-08-27
Child:eb450538f079
gifs/api/usage.go
Spike out functionality and tests. Create our interfaces around storing data and retrieving it. Create an in-memory implementation of our interfaces, for testing and rapid dev purposes. Begin sketching out what our unit tests look like. Create our Google Cloud Storage datastore implementation. Sketch out an idea for a usage collection process to keep track of which users are actually using stuff.
1 package api
3 import (
4 "sync"
5 )
7 func NewUsageTracker() *UsageTracker {
8 return &UsageTracker{
9 usages: make(map[string]*Usage),
10 }
11 }
13 type UsageTracker struct {
14 usages map[string]*Usage
15 sync.Mutex
16 }
18 func (u *UsageTracker) TrackUploads(id string) (bytes, requests chan int64) {
19 u.Lock()
20 defer u.Unlock()
21 if _, ok := u.usages[id]; !ok {
22 u.usages[id] = &Usage{
23 UploadBytesChan: make(chan int64),
24 DownloadBytesChan: make(chan int64),
25 UploadRequestsChan: make(chan int64),
26 DownloadRequestsChan: make(chan int64),
27 }
28 go u.usages[id].collect()
29 }
30 return u.usages[id].UploadBytesChan, u.usages[id].UploadRequestsChan
31 }
33 func (u *UsageTracker) TrackDownloads(id string) (bytes, requests chan int64) {
34 u.Lock()
35 defer u.Unlock()
36 if _, ok := u.usages[id]; !ok {
37 u.usages[id] = &Usage{
38 UploadBytesChan: make(chan int64),
39 DownloadBytesChan: make(chan int64),
40 UploadRequestsChan: make(chan int64),
41 DownloadRequestsChan: make(chan int64),
42 }
43 go u.usages[id].collect()
44 }
45 return u.usages[id].DownloadBytesChan, u.usages[id].DownloadRequestsChan
46 }
48 type Usage struct {
49 UploadedBytes int64
50 UploadBytesChan chan int64
51 DownloadedBytes int64
52 DownloadBytesChan chan int64
53 UploadRequests int64
54 UploadRequestsChan chan int64
55 DownloadRequests int64
56 DownloadRequestsChan chan int64
57 }
59 func (u *Usage) collect() {
60 for {
61 select {
62 case b, ok := <-u.UploadBytesChan:
63 if !ok {
64 u.UploadBytesChan = nil
65 }
66 u.UploadedBytes += b
67 case r, ok := <-u.UploadRequestsChan:
68 if !ok {
69 u.UploadRequestsChan = nil
70 }
71 u.UploadRequests += r
72 case b, ok := <-u.DownloadBytesChan:
73 if !ok {
74 u.DownloadBytesChan = nil
75 }
76 u.DownloadedBytes += b
77 case r, ok := <-u.DownloadRequestsChan:
78 if !ok {
79 u.DownloadRequestsChan = nil
80 }
81 u.DownloadRequests += r
82 }
83 if u.UploadBytesChan == nil && u.UploadRequestsChan == nil && u.DownloadBytesChan == nil && u.DownloadRequestsChan == nil {
84 break
85 }
86 }
87 }