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Fast endpoint implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| package webfile | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| ) | ||
|
|
||
| var ErrRequest = fmt.Errorf("request failed") | ||
|
|
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| //https://raw.githubusercontent.com/flashbots/dowg/main/builder-registrations.json | ||
|
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| type Fetcher struct { | ||
| url string | ||
| cl http.Client | ||
| } | ||
|
|
||
| func NewFetcher(url string) *Fetcher { | ||
| return &Fetcher{url: url, cl: http.Client{}} | ||
| } | ||
|
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| func (f *Fetcher) Fetch(ctx context.Context) ([]byte, error) { | ||
| //execute http request and load bytes | ||
| httpReq, err := http.NewRequestWithContext(ctx, http.MethodGet, f.url, nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| resp, err := f.cl.Do(httpReq) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| bts, err := io.ReadAll(resp.Body) | ||
| resp.Body.Close() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if resp.StatusCode >= 400 { | ||
| return nil, fmt.Errorf("err: %w status code %d", ErrRequest, resp.StatusCode) | ||
| } | ||
| return bts, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package webfile | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/http" | ||
| "testing" | ||
| ) | ||
|
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| func TestFetch(t *testing.T) { | ||
| f := Fetcher{ | ||
| url: "https://raw.githubusercontent.com/flashbots/dowg/main/builder-registrations.json", | ||
| cl: http.Client{}, | ||
| } | ||
| bts, err := f.Fetch(context.Background()) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| fmt.Println(string(bts)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| package application | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "strings" | ||
| "time" | ||
|
|
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| "github.com/ethereum/go-ethereum/log" | ||
| ) | ||
|
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| type BuilderInfo struct { | ||
| Name string `json:"name"` | ||
| RPC string `json:"rpc"` | ||
| SupportedApis []string `json:"supported-apis"` | ||
| } | ||
| type Fetcher interface { | ||
| Fetch(ctx context.Context) ([]byte, error) | ||
| } | ||
| type BuilderInfoService struct { | ||
| fetcher Fetcher | ||
| builderInfos []BuilderInfo | ||
| } | ||
|
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| func StartBuilderInfoService(ctx context.Context, fetcher Fetcher, fetchInterval time.Duration) (*BuilderInfoService, error) { | ||
| bis := BuilderInfoService{ | ||
| fetcher: fetcher, | ||
| } | ||
| if fetcher != nil { | ||
| err := bis.fetchBuilderInfo(ctx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| go bis.syncLoop(fetchInterval) | ||
|
|
||
| } | ||
| return &bis, nil | ||
| } | ||
| func (bis *BuilderInfoService) Builders() []BuilderInfo { | ||
| return bis.builderInfos | ||
| } | ||
|
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| func (bis *BuilderInfoService) BuilderNames() []string { | ||
| var names = make([]string, 0, len(bis.builderInfos)) | ||
| for _, builderInfo := range bis.builderInfos { | ||
| names = append(names, strings.ToLower(builderInfo.Name)) | ||
| } | ||
| return names | ||
| } | ||
|
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| func (bis *BuilderInfoService) syncLoop(fetchInterval time.Duration) { | ||
| ticker := time.NewTicker(fetchInterval) | ||
| for range ticker.C { | ||
| ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second) | ||
| err := bis.fetchBuilderInfo(ctx) | ||
| if err != nil { | ||
| //TODO: probably panic on multiple consequent errors, though it's not critical in nature | ||
| log.Error("failed to fetch builder info", "err", err) | ||
| } | ||
| cancel() | ||
| } | ||
| } | ||
|
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| func (bis *BuilderInfoService) fetchBuilderInfo(ctx context.Context) error { | ||
| bts, err := bis.fetcher.Fetch(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| var builderInfos []BuilderInfo | ||
| err = json.Unmarshal(bts, &builderInfos) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| bis.builderInfos = builderInfos | ||
| return nil | ||
| } |
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