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refactor: Remove global variables and complex import relationships
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,134 @@ | ||
| package fetch | ||
|
|
||
| import ( | ||
| "crypto/sha1" | ||
| "encoding/hex" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "net/url" | ||
| "path" | ||
| "time" | ||
|
|
||
| "github.com/gabe565/nightscout-menu-bar/internal/config" | ||
| "github.com/gabe565/nightscout-menu-bar/internal/nightscout" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrHttp = errors.New("unexpected HTTP error") | ||
| ErrNotModified = errors.New("not modified") | ||
| ) | ||
|
|
||
| func NewFetch(conf *config.Config) *Fetch { | ||
| return &Fetch{ | ||
| config: conf, | ||
| client: &http.Client{ | ||
| Timeout: time.Minute, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| type Fetch struct { | ||
| config *config.Config | ||
| client *http.Client | ||
| url *url.URL | ||
| tokenChecksum string | ||
| etag string | ||
| } | ||
|
|
||
| func (f *Fetch) Do() (*nightscout.Properties, error) { | ||
| if f.url == nil { | ||
| if err := f.UpdateUrl(); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| // Fetch JSON | ||
| req, err := http.NewRequest("GET", f.url.String(), nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if f.etag != "" { | ||
| req.Header.Set("If-None-Match", f.etag) | ||
| } | ||
|
|
||
| if f.tokenChecksum != "" { | ||
| req.Header.Set("Api-Secret", f.tokenChecksum) | ||
| } | ||
|
|
||
| resp, err := f.client.Do(req) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer func() { | ||
| _, _ = io.Copy(io.Discard, resp.Body) | ||
| _ = resp.Body.Close() | ||
| }() | ||
|
|
||
| switch resp.StatusCode { | ||
| case http.StatusNotModified: | ||
| return nil, ErrNotModified | ||
| case http.StatusOK: | ||
| // Decode JSON | ||
| var properties nightscout.Properties | ||
| if err := json.NewDecoder(resp.Body).Decode(&properties); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| f.etag = resp.Header.Get("etag") | ||
| return &properties, nil | ||
| default: | ||
| f.etag = "" | ||
| return nil, fmt.Errorf("%w: %d", ErrHttp, resp.StatusCode) | ||
| } | ||
| } | ||
|
|
||
| func (f *Fetch) UpdateUrl() error { | ||
| u, err := BuildUrl(f.config) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| u.Path = path.Join(u.Path, "api", "v2", "properties", "bgnow,buckets,delta,direction") | ||
| f.url = u | ||
|
|
||
| if token := f.config.Token; token != "" { | ||
| rawChecksum := sha1.Sum([]byte(token)) | ||
| f.tokenChecksum = hex.EncodeToString(rawChecksum[:]) | ||
| } else { | ||
| f.tokenChecksum = "" | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (f *Fetch) Reset() { | ||
| f.url = nil | ||
| f.tokenChecksum = "" | ||
| f.etag = "" | ||
| } | ||
|
|
||
| func BuildUrl(conf *config.Config) (*url.URL, error) { | ||
| if conf.URL == "" { | ||
| return nil, errors.New("please configure your Nightscout URL") | ||
| } | ||
|
|
||
| return url.Parse(conf.URL) | ||
| } | ||
|
|
||
| func BuildUrlWithToken(conf *config.Config) (*url.URL, error) { | ||
| u, err := BuildUrl(conf) | ||
| if err != nil { | ||
| return u, err | ||
| } | ||
|
|
||
| if token := conf.Token; token != "" { | ||
| query := u.Query() | ||
| query.Set("token", conf.Token) | ||
| u.RawQuery = query.Encode() | ||
| } | ||
|
|
||
| return u, nil | ||
| } |
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