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node: refactor package node (#21105)

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This PR significantly changes the APIs for instantiating Ethereum nodes in
a Go program. The new APIs are not backwards-compatible, but we feel that
this is made up for by the much simpler way of registering services on
node.Node. You can find more information and rationale in the design
document: https://gist.github.com/renaynay/5bec2de19fde66f4d04c535fd24f0775.

There is also a new feature in Node's Go API: it is now possible to
register arbitrary handlers on the user-facing HTTP server. In geth, this
facility is used to enable GraphQL.

There is a single minor change relevant for geth users in this PR: The
GraphQL API is no longer available separately from the JSON-RPC HTTP
server. If you want GraphQL, you need to enable it using the
./geth --http --graphql flag combination.

The --graphql.port and --graphql.addr flags are no longer available.
This commit is contained in:
rene
2020-08-03 19:40:46 +02:00
committed by GitHub
parent b2b14e6ce3
commit c0c01612e9
63 changed files with 2606 additions and 2887 deletions
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29
mobile/geth.go
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@ -175,49 +175,44 @@ func NewNode(datadir string, config *NodeConfig) (stack *Node, _ error) {
ethConf.SyncMode = downloader.LightSync
ethConf.NetworkId = uint64(config.EthereumNetworkID)
ethConf.DatabaseCache = config.EthereumDatabaseCache
if err := rawStack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
return les.New(ctx, &ethConf)
}); err != nil {
lesBackend, err := les.New(rawStack, &ethConf)
if err != nil {
return nil, fmt.Errorf("ethereum init: %v", err)
}
// If netstats reporting is requested, do it
if config.EthereumNetStats != "" {
if err := rawStack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
var lesServ *les.LightEthereum
ctx.Service(&lesServ)
return ethstats.New(config.EthereumNetStats, nil, lesServ)
}); err != nil {
if err := ethstats.New(rawStack, lesBackend.ApiBackend, lesBackend.Engine(), config.EthereumNetStats); err != nil {
return nil, fmt.Errorf("netstats init: %v", err)
}
}
}
// Register the Whisper protocol if requested
if config.WhisperEnabled {
if err := rawStack.Register(func(*node.ServiceContext) (node.Service, error) {
return whisper.New(&whisper.DefaultConfig), nil
}); err != nil {
if _, err := whisper.New(rawStack, &whisper.DefaultConfig); err != nil {
return nil, fmt.Errorf("whisper init: %v", err)
}
}
return &Node{rawStack}, nil
}
// Close terminates a running node along with all it's services, tearing internal
// state doen too. It's not possible to restart a closed node.
// Close terminates a running node along with all it's services, tearing internal state
// down. It is not possible to restart a closed node.
func (n *Node) Close() error {
return n.node.Close()
}
// Start creates a live P2P node and starts running it.
func (n *Node) Start() error {
// TODO: recreate the node so it can be started multiple times
return n.node.Start()
}
// Stop terminates a running node along with all it's services. If the node was
// not started, an error is returned.
// Stop terminates a running node along with all its services. If the node was not started,
// an error is returned. It is not possible to restart a stopped node.
//
// Deprecated: use Close()
func (n *Node) Stop() error {
return n.node.Stop()
return n.node.Close()
}
// GetEthereumClient retrieves a client to access the Ethereum subsystem.