0g-chain/tests/e2e/runner/main.go

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package runner
import (
"fmt"
"log"
"net/http"
"time"
"github.com/cenkalti/backoff/v4"
)
// NodeRunner is responsible for starting and managing docker containers to run a node.
type NodeRunner interface {
StartChains() Chains
Shutdown()
}
// waitForChainStart sets a timeout and repeatedly pings the chains.
// If the chain is successfully reached before the timeout, this returns no error.
func waitForChainStart(chainDetails ChainDetails) error {
// exponential backoff on trying to ping the node, timeout after 30 seconds
b := backoff.NewExponentialBackOff()
b.MaxInterval = 5 * time.Second
b.MaxElapsedTime = 30 * time.Second
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if err := backoff.Retry(func() error { return pingZgChain(chainDetails.RpcUrl) }, b); err != nil {
return fmt.Errorf("failed connect to chain: %s", err)
}
b.Reset()
// the evm takes a bit longer to start up. wait for it to start as well.
if err := backoff.Retry(func() error { return pingEvm(chainDetails.EvmRpcUrl) }, b); err != nil {
return fmt.Errorf("failed connect to chain: %s", err)
}
return nil
}
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func pingZgChain(rpcUrl string) error {
statusUrl := fmt.Sprintf("%s/status", rpcUrl)
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log.Printf("pinging 0g-chain: %s\n", statusUrl)
res, err := http.Get(statusUrl)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode >= 400 {
return fmt.Errorf("ping to status failed: %d", res.StatusCode)
}
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log.Println("successfully started ZgChain!")
return nil
}
func pingEvm(evmRpcUrl string) error {
log.Println("pinging evm...")
res, err := http.Get(evmRpcUrl)
if err != nil {
return err
}
defer res.Body.Close()
// when running, it should respond 405 to a GET request
if res.StatusCode != 405 {
return fmt.Errorf("ping to evm failed: %d", res.StatusCode)
}
log.Println("successfully pinged EVM!")
return nil
}