ipld-eth-server/cmd/proxy.go

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package cmd
import (
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/ethereum/go-ethereum/rpc"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"github.com/vulcanize/gap-filler/pkg/mux"
"github.com/vulcanize/gap-filler/pkg/qlservices"
)
var ErrNoRpcEndpoints = errors.New("no rpc endpoints is available")
// proxyCmd represents the proxy command
var proxyCmd = &cobra.Command{
Use: "proxy",
Short: "serve chain data from PG-IPFS or proxy geths",
Long: `This command configures a VulcanizeDB ipld-eth-server graphql server.
`,
Run: func(cmd *cobra.Command, args []string) {
subCommand = cmd.CalledAs()
logWithCommand = *logrus.WithField("SubCommand", subCommand)
proxy()
},
}
func proxy() {
gqlDefaultAddr, err := url.Parse(viper.GetString("gql.default"))
if err != nil {
logWithCommand.Fatal(err)
}
gqlTracingAPIAddr, err := url.Parse(viper.GetString("gql.tracing"))
if err != nil {
logWithCommand.Fatal(err)
}
rpcClients, err := parseRpcAddresses(viper.GetString("rpc.eth"))
if err != nil {
logrus.Error("bad rpc.eth addresses")
logWithCommand.Fatal(err)
}
rpcBalancer, err := qlservices.NewBalancer(rpcClients)
if err != nil {
logWithCommand.Fatal(err)
}
tracingClients, err := parseRpcAddresses(viper.GetString("rpc.tracing"))
if err != nil {
logrus.Error("bad rpc.tracing addresses")
logWithCommand.Fatal(err)
}
tracingBalancer, err := qlservices.NewBalancer(tracingClients)
if err != nil {
logWithCommand.Fatal(err)
}
router, err := mux.NewServeMux(&mux.Options{
BasePath: viper.GetString("http.path"),
EnableGraphiQL: viper.GetBool("gql.gui"),
Postgraphile: mux.PostgraphileOptions{
Default: gqlDefaultAddr,
TracingAPI: gqlTracingAPIAddr,
},
RPC: mux.RPCOptions{
DefaultBalancer: rpcBalancer,
TracingBalancer: tracingBalancer,
},
})
if err != nil {
logWithCommand.Fatal(err)
}
addr := fmt.Sprintf("%s:%s", viper.GetString("http.host"), viper.GetString("http.port"))
if err := http.ListenAndServe(addr, router); err != nil {
logWithCommand.Fatal(err)
}
}
func parseRpcAddresses(value string) ([]*rpc.Client, error) {
rpcAddresses := strings.Split(value, ",")
rpcClients := make([]*rpc.Client, 0, len(rpcAddresses))
for _, address := range rpcAddresses {
rpcClient, err := rpc.Dial(address)
if err != nil {
logWithCommand.Errorf("couldn't connect to %s. Error: %s", address, err)
continue
}
rpcClients = append(rpcClients, rpcClient)
}
if len(rpcClients) == 0 {
logWithCommand.Error(ErrNoRpcEndpoints)
return nil, ErrNoRpcEndpoints
}
return rpcClients, nil
}
func init() {
rootCmd.AddCommand(proxyCmd)
// flags
proxyCmd.PersistentFlags().String("http-host", "127.0.0.1", "http host")
proxyCmd.PersistentFlags().String("http-port", "8080", "http port")
proxyCmd.PersistentFlags().String("http-path", "/", "http base path")
proxyCmd.PersistentFlags().String("rpc-eth", "http://127.0.0.1:8545", "comma separated ethereum rpc addresses. Example http://127.0.0.1:8545,http://127.0.0.2:8545")
proxyCmd.PersistentFlags().String("rpc-tracing", "http://127.0.0.1:8000", "comma separated traicing api addresses")
proxyCmd.PersistentFlags().String("gql-default", "http://127.0.0.1:5020/graphql", "postgraphile address")
proxyCmd.PersistentFlags().String("gql-tracing", "http://127.0.0.1:5020/graphql", "tracing api postgraphile address")
proxyCmd.PersistentFlags().Bool("gql-gui", false, "enable graphiql interface")
// and their .toml config bindings
viper.BindPFlag("http.host", proxyCmd.PersistentFlags().Lookup("http-host"))
viper.BindPFlag("http.port", proxyCmd.PersistentFlags().Lookup("http-port"))
viper.BindPFlag("http.path", proxyCmd.PersistentFlags().Lookup("http-path"))
viper.BindPFlag("rpc.eth", proxyCmd.PersistentFlags().Lookup("rpc-eth"))
viper.BindPFlag("rpc.tracing", proxyCmd.PersistentFlags().Lookup("rpc-tracing"))
viper.BindPFlag("gql.default", proxyCmd.PersistentFlags().Lookup("gql-default"))
viper.BindPFlag("gql.tracing", proxyCmd.PersistentFlags().Lookup("gql-tracing"))
viper.BindPFlag("gql.gui", proxyCmd.PersistentFlags().Lookup("gql-gui"))
}