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Merge pull request #4 from sei-protocol/tony-chen-custom-goar
remove goar dependency
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package backends | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "net/url" | ||
| "path" | ||
| "strconv" | ||
| ) | ||
|
|
||
| type TransactionOffset struct { | ||
| Size string `json:"size"` | ||
| Offset string `json:"offset"` | ||
| } | ||
|
|
||
| type TransactionChunk struct { | ||
| Chunk string `json:"chunk"` | ||
| DataPath string `json:"data_path"` | ||
| TxPath string `json:"tx_path"` | ||
| } | ||
|
|
||
| type Client struct { | ||
| client *http.Client | ||
| url string | ||
| } | ||
|
|
||
| func NewClient(nodeUrl string, proxyUrl ...string) *Client { | ||
| httpClient := http.DefaultClient | ||
| // if exist proxy url | ||
| if len(proxyUrl) > 0 { | ||
| pUrl := proxyUrl[0] | ||
| proxyUrl, err := url.Parse(pUrl) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| tr := &http.Transport{Proxy: http.ProxyURL(proxyUrl)} | ||
| httpClient = &http.Client{Transport: tr} | ||
| } | ||
|
|
||
| return &Client{client: httpClient, url: nodeUrl} | ||
| } | ||
|
|
||
| func (c *Client) getTransactionOffset(id string) (*TransactionOffset, error) { | ||
| _path := fmt.Sprintf("tx/%s/offset", id) | ||
| body, statusCode, err := c.httpGet(_path) | ||
| if statusCode != 200 { | ||
| return nil, errors.New("not found tx offset") | ||
| } | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| txOffset := &TransactionOffset{} | ||
| if err := json.Unmarshal(body, txOffset); err != nil { | ||
| return nil, err | ||
| } | ||
| return txOffset, nil | ||
| } | ||
|
|
||
| func (c *Client) httpGet(_path string) (body []byte, statusCode int, err error) { | ||
| u, err := url.Parse(c.url) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| u.Path = path.Join(u.Path, _path) | ||
|
|
||
| resp, err := c.client.Get(u.String()) | ||
| if err != nil { | ||
| return | ||
| } | ||
| defer resp.Body.Close() | ||
|
|
||
| statusCode = resp.StatusCode | ||
| body, err = ioutil.ReadAll(resp.Body) | ||
| return | ||
| } | ||
|
|
||
| func (c *Client) DownloadChunkData(id string) ([]byte, error) { | ||
| offsetResponse, err := c.getTransactionOffset(id) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| size, err := strconv.ParseInt(offsetResponse.Size, 10, 64) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| endOffset, err := strconv.ParseInt(offsetResponse.Offset, 10, 64) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| startOffset := endOffset - size + 1 | ||
| data := make([]byte, 0, size) | ||
| for i := 0; int64(i)+startOffset < endOffset; { | ||
| chunkData, err := c.getChunkData(int64(i) + startOffset) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| data = append(data, chunkData...) | ||
| i += len(chunkData) | ||
| } | ||
| return data, nil | ||
| } | ||
|
|
||
| func (c *Client) getChunkData(offset int64) ([]byte, error) { | ||
| chunk, err := c.getChunk(offset) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return base64.RawURLEncoding.DecodeString(chunk.Chunk) | ||
| } | ||
|
|
||
| func (c *Client) getChunk(offset int64) (*TransactionChunk, error) { | ||
| _path := "chunk/" + strconv.FormatInt(offset, 10) | ||
| body, statusCode, err := c.httpGet(_path) | ||
| if statusCode != 200 { | ||
| return nil, errors.New("not found chunk data") | ||
| } | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| txChunk := &TransactionChunk{} | ||
| if err := json.Unmarshal(body, txChunk); err != nil { | ||
| return nil, err | ||
| } | ||
| return txChunk, nil | ||
| } |
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