github.com/nitinawathare/ethereumassignment3@v0.0.0-20211021213010-f07344c2b868/go-ethereum/cmd/swarm/global-store/global_store.go (about)

     1  // Copyright 2019 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"io"
    21  	"net"
    22  	"net/http"
    23  	"os"
    24  
    25  	"github.com/ethereum/go-ethereum/log"
    26  	"github.com/ethereum/go-ethereum/rpc"
    27  	"github.com/ethereum/go-ethereum/swarm/storage/mock"
    28  	"github.com/ethereum/go-ethereum/swarm/storage/mock/db"
    29  	"github.com/ethereum/go-ethereum/swarm/storage/mock/mem"
    30  	cli "gopkg.in/urfave/cli.v1"
    31  )
    32  
    33  // startHTTP starts a global store with HTTP RPC server.
    34  // It is used for "http" cli command.
    35  func startHTTP(ctx *cli.Context) (err error) {
    36  	server, cleanup, err := newServer(ctx)
    37  	if err != nil {
    38  		return err
    39  	}
    40  	defer cleanup()
    41  
    42  	listener, err := net.Listen("tcp", ctx.String("addr"))
    43  	if err != nil {
    44  		return err
    45  	}
    46  	log.Info("http", "address", listener.Addr().String())
    47  
    48  	return http.Serve(listener, server)
    49  }
    50  
    51  // startWS starts a global store with WebSocket RPC server.
    52  // It is used for "websocket" cli command.
    53  func startWS(ctx *cli.Context) (err error) {
    54  	server, cleanup, err := newServer(ctx)
    55  	if err != nil {
    56  		return err
    57  	}
    58  	defer cleanup()
    59  
    60  	listener, err := net.Listen("tcp", ctx.String("addr"))
    61  	if err != nil {
    62  		return err
    63  	}
    64  	origins := ctx.StringSlice("origins")
    65  	log.Info("websocket", "address", listener.Addr().String(), "origins", origins)
    66  
    67  	return http.Serve(listener, server.WebsocketHandler(origins))
    68  }
    69  
    70  // newServer creates a global store and starts a chunk explorer server if configured.
    71  // Returned cleanup function should be called only if err is nil.
    72  func newServer(ctx *cli.Context) (server *rpc.Server, cleanup func(), err error) {
    73  	log.PrintOrigins(true)
    74  	log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(ctx.Int("verbosity")), log.StreamHandler(os.Stdout, log.TerminalFormat(false))))
    75  
    76  	cleanup = func() {}
    77  	var globalStore mock.GlobalStorer
    78  	dir := ctx.String("dir")
    79  	if dir != "" {
    80  		dbStore, err := db.NewGlobalStore(dir)
    81  		if err != nil {
    82  			return nil, nil, err
    83  		}
    84  		cleanup = func() {
    85  			if err := dbStore.Close(); err != nil {
    86  				log.Error("global store: close", "err", err)
    87  			}
    88  		}
    89  		globalStore = dbStore
    90  		log.Info("database global store", "dir", dir)
    91  	} else {
    92  		globalStore = mem.NewGlobalStore()
    93  		log.Info("in-memory global store")
    94  	}
    95  
    96  	server = rpc.NewServer()
    97  	if err := server.RegisterName("mockStore", globalStore); err != nil {
    98  		cleanup()
    99  		return nil, nil, err
   100  	}
   101  
   102  	shutdown, err := serveChunkExplorer(ctx, globalStore)
   103  	if err != nil {
   104  		cleanup()
   105  		return nil, nil, err
   106  	}
   107  	if shutdown != nil {
   108  		cleanup = func() {
   109  			shutdown()
   110  
   111  			if c, ok := globalStore.(io.Closer); ok {
   112  				if err := c.Close(); err != nil {
   113  					log.Error("global store: close", "err", err)
   114  				}
   115  			}
   116  		}
   117  	}
   118  
   119  	return server, cleanup, nil
   120  }