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* filter action list * fetch more than one page at a time
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,58 +1,105 @@ | ||
| package do | ||
|
|
||
| import ( | ||
| "log" | ||
| "fmt" | ||
| "net/url" | ||
| "strconv" | ||
| "sync" | ||
|
|
||
| "github.com/digitalocean/godo" | ||
| "github.com/spf13/viper" | ||
| ) | ||
|
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| const maxFetchPages = 10 | ||
|
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| type paginatedList struct { | ||
| list []interface{} | ||
| mu sync.Mutex | ||
| } | ||
|
|
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| func (pl *paginatedList) append(items ...interface{}) { | ||
| pl.mu.Lock() | ||
| defer pl.mu.Unlock() | ||
|
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| pl.list = append(pl.list, items...) | ||
| } | ||
|
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| // Generator is a function that generates the list to be paginated. | ||
| type Generator func(*godo.ListOptions) ([]interface{}, *godo.Response, error) | ||
|
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| // PaginateResp paginates a Response. | ||
| func PaginateResp(gen Generator) ([]interface{}, error) { | ||
| opt := &godo.ListOptions{Page: 1, PerPage: 200} | ||
| list := []interface{}{} | ||
|
|
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| for { | ||
| items, resp, err := gen(opt) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| for _, i := range items { | ||
| list = append(list, i) | ||
| } | ||
|
|
||
| if resp == nil || resp.Links.Pages == nil { | ||
| break | ||
| } | ||
|
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| if uStr := resp.Links.Pages.Next; len(uStr) > 0 { | ||
| u, err := url.Parse(uStr) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if viper.GetBool("debug") { | ||
| log.Printf("page.current=%v page.per=%v", opt.Page, opt.PerPage) | ||
| } | ||
| pageStr := u.Query().Get("page") | ||
| page, err := strconv.Atoi(pageStr) | ||
| if err != nil { | ||
| return nil, err | ||
| l := paginatedList{} | ||
|
|
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| fetchChan := make(chan int, 5) | ||
|
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| var wg sync.WaitGroup | ||
| for i := 0; i < 4; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| for page := range fetchChan { | ||
| items, err := fetchPage(gen, page) | ||
| if err == nil { | ||
| l.append(items...) | ||
| } | ||
| } | ||
| wg.Done() | ||
| }() | ||
| } | ||
|
|
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| opt.Page = page | ||
| continue | ||
| } | ||
| // fetch first page to get page count (x) | ||
| items, resp, err := gen(opt) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| l.append(items...) | ||
|
|
||
| break | ||
| // find last page | ||
| lp, err := lastPage(resp) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return list, nil | ||
| // start with second page | ||
| for i := 2; i < lp; i++ { | ||
| fetchChan <- i | ||
| } | ||
| close(fetchChan) | ||
|
|
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| wg.Wait() | ||
|
|
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| return l.list, nil | ||
| } | ||
|
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| func fetchPage(gen Generator, page int) ([]interface{}, error) { | ||
| opt := &godo.ListOptions{Page: page, PerPage: 200} | ||
| items, _, err := gen(opt) | ||
| return items, err | ||
| } | ||
|
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||
| func lastPage(resp *godo.Response) (int, error) { | ||
| if resp.Links.Pages == nil { | ||
| // no other pages | ||
| return 1, nil | ||
| } | ||
|
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||
| uStr := resp.Links.Pages.Last | ||
| if uStr == "" { | ||
| return 1, nil | ||
| } | ||
|
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| u, err := url.Parse(uStr) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("could not parse last page: %v", err) | ||
| } | ||
|
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| pageStr := u.Query().Get("page") | ||
| page, err := strconv.Atoi(pageStr) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("could not find page param: %v", err) | ||
| } | ||
|
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| return page, err | ||
| } |