helium-blockchain-exporter/heliumapi/block.go

package heliumapi

import (
	"encoding/json"
	"fmt"
	"time"
)

// query https://docs.helium.com/api/blockchain/blocks/#height
func GetHeight(maxTime *time.Time) (int, error) {
	// TODO: the result of this query could be cached
	path := "/v1/blocks/height"
	params := map[string]string{}
	if maxTime != nil {
		params["max_time"] = maxTime.UTC().Format(time.RFC3339)
	}

	// query the api
	respBody, err := getHeliumApi(path, &params)
	if err != nil {
		return -1, err
	}

	// unmarshal the response
	respobject := HeightResp{}
	err = json.Unmarshal(respBody, &respobject)
	if err != nil {
		return -1, fmt.Errorf("failed to unmarshal response from %v: %v", path, err)
	}

	return respobject.Data.Height, nil
}