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package abcicli
import (
"fmt"
"sync"
"github.com/tendermint/tendermint/abci/types"
cmn "github.com/tendermint/tendermint/libs/common"
)
const (
dialRetryIntervalSeconds = 3
echoRetryIntervalSeconds = 1
)
// Client defines an interface for an ABCI client.
// All `Async` methods return a `ReqRes` object.
// All `Sync` methods return the appropriate protobuf ResponseXxx struct and an error.
// Note these are client errors, eg. ABCI socket connectivity issues.
// Application-related errors are reflected in response via ABCI error codes and logs.
type Client interface {
cmn.Service
SetResponseCallback(Callback)
Error() error
FlushAsync() *ReqRes
EchoAsync(msg string) *ReqRes
InfoAsync(types.RequestInfo) *ReqRes
SetOptionAsync(types.RequestSetOption) *ReqRes
DeliverTxAsync(tx []byte) *ReqRes
CheckTxAsync(tx []byte) *ReqRes
QueryAsync(types.RequestQuery) *ReqRes
CommitAsync() *ReqRes
InitChainAsync(types.RequestInitChain) *ReqRes
BeginBlockAsync(types.RequestBeginBlock) *ReqRes
EndBlockAsync(types.RequestEndBlock) *ReqRes
FlushSync() error
EchoSync(msg string) (*types.ResponseEcho, error)
InfoSync(types.RequestInfo) (*types.ResponseInfo, error)
SetOptionSync(types.RequestSetOption) (*types.ResponseSetOption, error)
DeliverTxSync(tx []byte) (*types.ResponseDeliverTx, error)
CheckTxSync(tx []byte) (*types.ResponseCheckTx, error)
QuerySync(types.RequestQuery) (*types.ResponseQuery, error)
CommitSync() (*types.ResponseCommit, error)
InitChainSync(types.RequestInitChain) (*types.ResponseInitChain, error)
BeginBlockSync(types.RequestBeginBlock) (*types.ResponseBeginBlock, error)
EndBlockSync(types.RequestEndBlock) (*types.ResponseEndBlock, error)
}
//----------------------------------------
// NewClient returns a new ABCI client of the specified transport type.
// It returns an error if the transport is not "socket" or "grpc"
func NewClient(addr, transport string, mustConnect bool) (client Client, err error) {
switch transport {
case "socket":
client = NewSocketClient(addr, mustConnect)
case "grpc":
client = NewGRPCClient(addr, mustConnect)
default:
err = fmt.Errorf("Unknown abci transport %s", transport)
}
return
}
//----------------------------------------
type Callback func(*types.Request, *types.Response)
//----------------------------------------
type ReqRes struct {
*types.Request
*sync.WaitGroup
*types.Response // Not set atomically, so be sure to use WaitGroup.
mtx sync.Mutex
done bool // Gets set to true once *after* WaitGroup.Done().
cb func(*types.Response) // A single callback that may be set.
}
func NewReqRes(req *types.Request) *ReqRes {
return &ReqRes{
Request: req,
WaitGroup: waitGroup1(),
Response: nil,
done: false,
cb: nil,
}
}
// Sets the callback for this ReqRes atomically.
// If reqRes is already done, calls cb immediately.
// NOTE: reqRes.cb should not change if reqRes.done.
// NOTE: only one callback is supported.
func (reqRes *ReqRes) SetCallback(cb func(res *types.Response)) {
reqRes.mtx.Lock()
if reqRes.done {
reqRes.mtx.Unlock()
cb(reqRes.Response)
return
}
defer reqRes.mtx.Unlock()
reqRes.cb = cb
}
func (reqRes *ReqRes) GetCallback() func(*types.Response) {
reqRes.mtx.Lock()
defer reqRes.mtx.Unlock()
return reqRes.cb
}
// NOTE: it should be safe to read reqRes.cb without locks after this.
func (reqRes *ReqRes) SetDone() {
reqRes.mtx.Lock()
reqRes.done = true
reqRes.mtx.Unlock()
}
func waitGroup1() (wg *sync.WaitGroup) {
wg = &sync.WaitGroup{}
wg.Add(1)
return
}