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node_info.go
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node_info.go
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package ping
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/onflow/flow-go/model/flow"
)
func readExtraNodeInfoJSON(jsonFileName string) (map[flow.Identifier]string, error) {
// read the file
byteValue, err := openAndReadFile(jsonFileName)
if err != nil {
return nil, err
}
// unmarshal json data
result, err := unmarshalNodeInfoFromJSONData(byteValue)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal %s: %w", jsonFileName, err)
}
return result, nil
}
func openAndReadFile(fileName string) ([]byte, error) {
//open
jsonFile, err := os.Open(fileName)
if err != nil {
return nil, fmt.Errorf("failed to open %s: %w", fileName, err)
}
defer jsonFile.Close()
// read
byteValue, err := ioutil.ReadAll(jsonFile)
if err != nil {
return nil, fmt.Errorf("failed to read %s: %w", fileName, err)
}
return byteValue, nil
}
func unmarshalNodeInfoFromJSONData(jsonData []byte) (map[flow.Identifier]string, error) {
var result map[flow.Identifier]string
err := json.Unmarshal(jsonData, &result)
if err != nil {
return nil, err
}
return result, nil
}