move handshake to state, use Handshaker, more tests

state/errors.go

@@ -0,0 +1,55 @@
+package state
+
+import (
+	. "github.com/tendermint/go-common"
+)
+
+type (
+	ErrInvalidBlock error
+	ErrProxyAppConn error
+
+	ErrUnknownBlock struct {
+		height int
+	}
+
+	ErrBlockHashMismatch struct {
+		coreHash []byte
+		appHash  []byte
+		height   int
+	}
+
+	ErrAppBlockHeightTooHigh struct {
+		coreHeight int
+		appHeight  int
+	}
+
+	ErrLastStateMismatch struct {
+		height int
+		core   []byte
+		app    []byte
+	}
+
+	ErrStateMismatch struct {
+		got      *State
+		expected *State
+	}
+)
+
+func (e ErrUnknownBlock) Error() string {
+	return Fmt("Could not find block #%d", e.height)
+}
+
+func (e ErrBlockHashMismatch) Error() string {
+	return Fmt("App block hash (%X) does not match core block hash (%X) for height %d", e.appHash, e.coreHash, e.height)
+}
+
+func (e ErrAppBlockHeightTooHigh) Error() string {
+	return Fmt("App block height (%d) is higher than core (%d)", e.appHeight, e.coreHeight)
+}
+func (e ErrLastStateMismatch) Error() string {
+	return Fmt("Latest tendermint block (%d) LastAppHash (%X) does not match app's AppHash (%X)", e.height, e.core, e.app)
+}
+
+func (e ErrStateMismatch) Error() string {
+	return Fmt("State after replay does not match saved state. Got ----\n%v\nExpected ----\n%v\n", e.got, e.expected)
+}