node: sketch of debug node logic

node/debug.go

@@ -0,0 +1,78 @@
+package node
+
+import (
+	"net"
+
+	"github.com/tendermint/tendermint/config"
+	cfg "github.com/tendermint/tendermint/config"
+	"github.com/tendermint/tendermint/libs/log"
+	"github.com/tendermint/tendermint/libs/service"
+	rpccore "github.com/tendermint/tendermint/rpc/core"
+	sm "github.com/tendermint/tendermint/state"
+	"github.com/tendermint/tendermint/store"
+	"github.com/tendermint/tendermint/types"
+)
+
+// Debug is a type useful for debugging tendermint problems.
+// Tendermint nodes will shutdown if a divergent hash is detected. Once in this
+// state, they will not start up again. Debug runs just an RPC server on the
+// tendermint data stores without running any other components. This way a user
+// can query the RPC server to diagnose the issue that caused a crash to begin with.
+type Debug struct {
+	service.BaseService
+
+	blockStore sm.BlockStore
+	stateStore sm.Store
+
+	rpcConfig *cfg.RPCConfig
+	listeners []net.Listener
+}
+
+func NewDebugFromConfig(cfg *config.Config) (*Debug, error) {
+	blockStoreDB, err := config.DefaultDBProvider(&config.DBContext{ID: _blockStoreID, Config: cfg})
+	if err != nil {
+		return nil, err
+	}
+	blockStore := store.NewBlockStore(blockStoreDB)
+	stateDB, err := config.DefaultDBProvider(&config.DBContext{ID: _stateStoreID, Config: cfg})
+	stateStore := sm.NewStore(stateDB)
+
+	return NewDebug(cfg.RPC, blockStore, stateStore), nil
+}
+
+func NewDebug(rpcConfig *cfg.RPCConfig, blockStore sm.BlockStore, stateStore sm.Store) *Debug {
+	return &Debug{
+		blockStore: blockStore,
+		stateStore: stateStore,
+		rpcConfig:  rpcConfig,
+	}
+}
+
+func NewDefaultDebug() (*Debug, error) {
+	cfg := config.Config{
+		BaseConfig: config.DefaultBaseConfig(),
+		RPC:        config.DefaultRPCConfig(),
+	}
+	return NewDebugFromConfig(&cfg)
+}
+
+func (debug *Debug) OnStart() error {
+	rpcCoreEnv := rpccore.Environment{
+		StateStore: debug.stateStore,
+		BlockStore: debug.blockStore,
+	}
+	routes := rpcCoreEnv.InfoRoutes()
+	l := log.MustNewDefaultLogger(log.LogFormatPlain, log.LogLevelInfo, false)
+	listeners, err := startHTTPRPCServer(debug.rpcConfig, l, routes, types.NopEventBus{})
+	if err != nil {
+		return err
+	}
+	debug.listeners = listeners
+	return nil
+}
+
+func (debug *Debug) OnStop() {
+	for _, listener := range debug.listeners {
+		listener.Close()
+	}
+}