dione/rpc/filecoin/filecoin.go

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package filecoin
import (
"bytes"
"encoding/json"
"fmt"
ftypes "github.com/Secured-Finance/dione/rpc/filecoin/types"
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"github.com/Secured-Finance/dione/rpc/types"
"github.com/filecoin-project/go-address"
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"github.com/sirupsen/logrus"
"github.com/valyala/fasthttp"
)
var filecoinURL = "https://api.node.glif.io/"
// client implements the `Client` interface.
type LotusClient struct {
host string
httpClient *fasthttp.Client
}
// NewClient returns a new client.
func NewLotusClient() *LotusClient {
return &LotusClient{
host: filecoinURL,
httpClient: &fasthttp.Client{},
}
}
func (c *LotusClient) GetBlock(cid string) ([]byte, error) {
i := ftypes.NewCidParam(cid)
return c.HandleRequest("Filecoin.ChainGetBlock", i)
}
func (c *LotusClient) GetTipSetByHeight(chainEpoch int64) ([]byte, error) {
i := make([]interface{}, 0)
i = append(i, chainEpoch, nil)
return c.HandleRequest("Filecoin.ChainGetTipSetByHeight", i)
}
// func (c *LotusClient) GetTransaction(cid string) (string, error) {
// i := ftypes.NewCidParam(cid)
// resp, err := c.HandleRequest("Filecoin.ChainGetMessage", i)
// return string(resp), err
// }
func (c *LotusClient) GetNodeVersion() ([]byte, error) {
return c.HandleRequest("Filecoin.Version", nil)
}
func (c *LotusClient) GetChainHead() ([]byte, error) {
return c.HandleRequest("Filecoin.ChainHead", nil)
}
func (c *LotusClient) VerifyCid(cid string) ([]byte, error) {
i := ftypes.NewCidParam(cid)
return c.HandleRequest("Filecoin.ChainHasObj", i)
}
// Gets signed transaction from Filecoin and returns SignedTransaction struct in byte slice
func (c *LotusClient) GetTransaction(cid string) ([]byte, error) {
i := ftypes.NewCidParam(cid)
bodyBytes, err := c.HandleRequest("Filecoin.ChainReadObj", i)
if err != nil {
return nil, fmt.Errorf("Failed to get object information %v", err)
}
var response types.RPCResponseBody
err = json.Unmarshal(bodyBytes, &response)
if err != nil {
return nil, fmt.Errorf("Failed to unmarshal response body %v", err)
}
var msg ftypes.SignedMessage
if err := msg.UnmarshalCBOR(bytes.NewReader(response.Result)); err != nil {
if err := msg.Message.UnmarshalCBOR(bytes.NewReader(response.Result)); err != nil {
return nil, err
}
}
switch msg.Message.From.Protocol() | msg.Message.To.Protocol() {
case address.BLS:
msg.Type = ftypes.MessageTypeBLS
case address.SECP256K1:
msg.Type = ftypes.MessageTypeSecp256k1
default:
return nil, fmt.Errorf("Address has unsupported protocol %v", err)
}
b := new(bytes.Buffer)
if err := msg.MarshalCBOR(b); err != nil {
return nil, err
}
return b.Bytes(), nil
}
// HandleRequest implements the `Client` interface.
func (c *LotusClient) HandleRequest(method string, params []interface{}) ([]byte, error) {
req := fasthttp.AcquireRequest()
req.SetRequestURI(c.host)
req.Header.SetMethod("POST")
req.Header.SetContentType("application/json")
requestBody := types.NewRPCRequestBody(method)
requestBody.Params = append(requestBody.Params, params...)
body, err := json.Marshal(requestBody)
if err != nil {
return nil, fmt.Errorf("Failed to marshal request body %v", err)
}
req.AppendBody(body)
resp := fasthttp.AcquireResponse()
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if err = c.httpClient.Do(req, resp); err != nil {
logrus.Warn("Failed to construct filecoin node rpc request", err)
return nil, err
}
bodyBytes := resp.Body()
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logrus.Tracef("Filecoin RPC reply: %v", string(bodyBytes))
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return bodyBytes, nil
}