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EstimateEnergy gRPC Method

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Updated on
May 13, 2025

EstimateEnergy gRPC Method

Parameters

from
string
REQUIRED
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contractAddress
string
REQUIRED
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method
string
REQUIRED
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jsonString
string
REQUIRED
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tAmount
integer
REQUIRED
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tTokenID
string
REQUIRED
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tTokenAmount
integer
REQUIRED
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Returns

result
object
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result
boolean
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code
string
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message
string
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energy_required
integer
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Request
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package main
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import (
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   "context"
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   "crypto/tls"
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   "encoding/json"
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   "fmt"
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   "github.com/fbsobreira/gotron-sdk/pkg/client"
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   "google.golang.org/grpc"
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   "google.golang.org/grpc/credentials"
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)
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// Quicknode endpoints consist of two crucial components: the endpoint name and the corresponding token
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// For eg: QN Endpoint: https://docs-demo.tron-mainnet.quiknode.pro/abcde123456789
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// endpoint will be: docs-demo.tron-mainnet.quiknode.pro:50051  {50051 is the port number for Tron gRPC}
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// token will be : abcde123456789
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var token = "YOUR_TOKEN"
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var endpoint = "YOUR_ENDPOINT:50051"
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type auth struct {
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   token string
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}
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func (a *auth) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
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   return map[string]string{
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      "x-token": a.token,
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   }, nil
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}
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func (a *auth) RequireTransportSecurity() bool {
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   return false
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}
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func main() {
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   opts := []grpc.DialOption{
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      grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})),
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      grpc.WithPerRPCCredentials(&auth{token}),
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   }
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   conn := client.NewGrpcClient(endpoint)
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   if err := conn.Start(opts...); err != nil {
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      panic(err)
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   }
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   defer conn.Conn.Close()
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   from := "TTGhREx2pDSxFX555NWz1YwGpiBVPvQA7e"
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   contractAddress := "TVSvjZdyDSNocHm7dP3jvCmMNsCnMTPa5W"
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   method := "transfer(address,uint256)"
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   jsonString := `[{"address": "TE4c73WubeWPhSF1nAovQDmQytjcaLZyY9"},{"uint256": "100"}]`
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   tAmount := int64(0)
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   tTokenID := ""
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   tTokenAmount := int64(0)
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   fmt.Println("Estimating energy for contract call...")
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   energy, err := conn.EstimateEnergy(
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      from,            // Caller's address
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      contractAddress, // Contract address
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      method,          // Function selector
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      jsonString,      // Parameters in JSON format
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      tAmount,         // TRX value to send
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      tTokenID,        // Token ID (if applicable)
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      tTokenAmount,    // Token value (if applicable)
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   )
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   if err != nil {
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      fmt.Printf("Error estimating energy: %v\n", err)
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      return
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   }
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   fmt.Println("Energy estimation successful! Results:")
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   jsonData, _ := json.MarshalIndent(energy, "", "  ")
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   fmt.Println(string(jsonData))
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   if !energy.Result.Result {
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      fmt.Println("Energy estimation failed!")
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      if len(energy.Result.Message) > 0 {
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         fmt.Printf("Error message: %s\n", energy.Result.Message)
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      }
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      return
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   }
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   energyRequired := energy.EnergyRequired
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   energyBuffer := energyRequired / 5 // Add 20% buffer
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   recommendedFeeLimit := (energyRequired + energyBuffer) * 420
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   fmt.Printf("\nEstimated energy required: %d\n", energyRequired)
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   fmt.Printf("Recommended fee limit (with 20%% buffer): %d SUN\n", recommendedFeeLimit)
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   fmt.Println("\nYou can use this fee limit when making the actual transaction.")
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}
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