/
api.go
103 lines (83 loc) · 1.67 KB
/
api.go
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package lotuscli
import (
"bytes"
"encoding/json"
"io"
"net/http"
logging "github.com/ipfs/go-log/v2"
"golang.org/x/xerrors"
)
var log = logging.Logger("lotus")
// ChainHead lotus ChainHead api
func ChainHead(url string) (uint64, error) {
req := request{
Jsonrpc: "2.0",
Method: "Filecoin.ChainHead",
Params: nil,
ID: 1,
}
rsp, err := requestLotus(url, req)
if err != nil {
return 0, err
}
b, err := json.Marshal(rsp.Result)
if err != nil {
return 0, err
}
var ts TipSet
err = json.Unmarshal(b, &ts)
if err != nil {
return 0, err
}
return ts.Height(), nil
}
// ChainGetTipSetByHeight lotus ChainGetTipSetByHeight api
func ChainGetTipSetByHeight(url string, height int64) (*TipSet, error) {
serializedParams := params{
height, nil,
}
req := request{
Jsonrpc: "2.0",
Method: "Filecoin.ChainGetTipSetByHeight",
Params: serializedParams,
ID: 1,
}
rsp, err := requestLotus(url, req)
if err != nil {
return nil, err
}
b, err := json.Marshal(rsp.Result)
if err != nil {
return nil, err
}
var ts TipSet
err = json.Unmarshal(b, &ts)
if err != nil {
return nil, err
}
return &ts, nil
}
func requestLotus(url string, req request) (*response, error) {
jsonData, err := json.Marshal(req)
if err != nil {
return nil, err
}
resp, err := http.Post(url, "application/json", bytes.NewBuffer(jsonData))
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
var rsp response
err = json.Unmarshal(body, &rsp)
if err != nil {
return nil, err
}
if rsp.Error != nil {
return nil, xerrors.New(rsp.Error.Message)
}
return &rsp, nil
}