github.com/fozzysec/SiaPrime@v0.0.0-20190612043147-66c8e8d11fe3/cmd/spc/consensuscmd.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"time"
     6  
     7  	"github.com/spf13/cobra"
     8  
     9  	"SiaPrime/types"
    10  )
    11  
    12  var (
    13  	consensusCmd = &cobra.Command{
    14  		Use:   "consensus",
    15  		Short: "Print the current state of consensus",
    16  		Long:  "Print the current state of consensus such as current block, block height, and target.",
    17  		Run:   wrap(consensuscmd),
    18  	}
    19  )
    20  
    21  // consensuscmd is the handler for the command `siac consensus`.
    22  // Prints the current state of consensus.
    23  func consensuscmd() {
    24  	cg, err := httpClient.ConsensusGet()
    25  	if err != nil {
    26  		die("Could not get current consensus state:", err)
    27  	}
    28  	if cg.Synced {
    29  		fmt.Printf(`Synced: %v
    30  Block:      %v
    31  Height:     %v
    32  Target:     %v
    33  Difficulty: %v
    34  `, yesNo(cg.Synced), cg.CurrentBlock, cg.Height, cg.Target, cg.Difficulty)
    35  	} else {
    36  		estimatedHeight := estimatedHeightAt(time.Now())
    37  		estimatedProgress := float64(cg.Height) / float64(estimatedHeight) * 100
    38  		if estimatedProgress > 100 {
    39  			estimatedProgress = 100
    40  		}
    41  		fmt.Printf(`Synced: %v
    42  Height: %v
    43  Progress (estimated): %.1f%%
    44  `, yesNo(cg.Synced), cg.Height, estimatedProgress)
    45  	}
    46  }
    47  
    48  // estimatedHeightAt returns the estimated block height for the given time.
    49  // Block height is estimated by calculating the minutes since a known block in
    50  // the past and dividing by 10 minutes (the block time).
    51  func estimatedHeightAt(t time.Time) types.BlockHeight {
    52  	block5kTimestamp := time.Unix(1543958696, 0)
    53  	blockTime := float64(9) // overestimate block time for better UX
    54  	diff := t.Sub(block5kTimestamp)
    55  	estimatedHeight := 5000 + (diff.Minutes() / blockTime)
    56  	return types.BlockHeight(estimatedHeight + 0.5) // round to the nearest block
    57  }