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138 lines
4.4 KiB
138 lines
4.4 KiB
package abciclient
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import (
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"context"
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"fmt"
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"sync"
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"github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/libs/service"
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)
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const (
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dialRetryIntervalSeconds = 3
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echoRetryIntervalSeconds = 1
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)
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//go:generate ../../scripts/mockery_generate.sh Client
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// Client defines an interface for an ABCI client.
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//
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// All `Async` methods return a `ReqRes` object and an error.
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// All `Sync` methods return the appropriate protobuf ResponseXxx struct and an error.
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//
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// NOTE these are client errors, eg. ABCI socket connectivity issues.
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// Application-related errors are reflected in response via ABCI error codes
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// and logs.
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type Client interface {
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service.Service
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SetResponseCallback(Callback)
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Error() error
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// Asynchronous requests
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FlushAsync(context.Context) (*ReqRes, error)
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CheckTxAsync(context.Context, types.RequestCheckTx) (*ReqRes, error)
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// Synchronous requests
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Flush(context.Context) error
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Echo(ctx context.Context, msg string) (*types.ResponseEcho, error)
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Info(context.Context, types.RequestInfo) (*types.ResponseInfo, error)
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CheckTx(context.Context, types.RequestCheckTx) (*types.ResponseCheckTx, error)
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Query(context.Context, types.RequestQuery) (*types.ResponseQuery, error)
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Commit(context.Context) (*types.ResponseCommit, error)
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InitChain(context.Context, types.RequestInitChain) (*types.ResponseInitChain, error)
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PrepareProposal(context.Context, types.RequestPrepareProposal) (*types.ResponsePrepareProposal, error)
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ProcessProposal(context.Context, types.RequestProcessProposal) (*types.ResponseProcessProposal, error)
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ExtendVote(context.Context, types.RequestExtendVote) (*types.ResponseExtendVote, error)
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VerifyVoteExtension(context.Context, types.RequestVerifyVoteExtension) (*types.ResponseVerifyVoteExtension, error)
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FinalizeBlock(context.Context, types.RequestFinalizeBlock) (*types.ResponseFinalizeBlock, error)
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ListSnapshots(context.Context, types.RequestListSnapshots) (*types.ResponseListSnapshots, error)
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OfferSnapshot(context.Context, types.RequestOfferSnapshot) (*types.ResponseOfferSnapshot, error)
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LoadSnapshotChunk(context.Context, types.RequestLoadSnapshotChunk) (*types.ResponseLoadSnapshotChunk, error)
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ApplySnapshotChunk(context.Context, types.RequestApplySnapshotChunk) (*types.ResponseApplySnapshotChunk, error)
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}
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//----------------------------------------
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// NewClient returns a new ABCI client of the specified transport type.
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// It returns an error if the transport is not "socket" or "grpc"
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func NewClient(logger log.Logger, addr, transport string, mustConnect bool) (client Client, err error) {
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switch transport {
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case "socket":
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client = NewSocketClient(logger, addr, mustConnect)
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case "grpc":
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client = NewGRPCClient(logger, addr, mustConnect)
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default:
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err = fmt.Errorf("unknown abci transport %s", transport)
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}
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return
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}
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type Callback func(*types.Request, *types.Response)
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type ReqRes struct {
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*types.Request
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*types.Response // Not set atomically, so be sure to use WaitGroup.
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mtx sync.Mutex
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signal chan struct{}
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cb func(*types.Response) // A single callback that may be set.
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}
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func NewReqRes(req *types.Request) *ReqRes {
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return &ReqRes{
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Request: req,
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Response: nil,
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signal: make(chan struct{}),
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cb: nil,
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}
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}
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// Sets sets the callback. If reqRes is already done, it will call the cb
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// immediately. Note, reqRes.cb should not change if reqRes.done and only one
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// callback is supported.
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func (r *ReqRes) SetCallback(cb func(res *types.Response)) {
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r.mtx.Lock()
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select {
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case <-r.signal:
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r.mtx.Unlock()
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cb(r.Response)
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default:
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r.cb = cb
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r.mtx.Unlock()
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}
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}
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// InvokeCallback invokes a thread-safe execution of the configured callback
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// if non-nil.
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func (r *ReqRes) InvokeCallback() {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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if r.cb != nil {
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r.cb(r.Response)
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}
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}
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// GetCallback returns the configured callback of the ReqRes object which may be
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// nil. Note, it is not safe to concurrently call this in cases where it is
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// marked done and SetCallback is called before calling GetCallback as that
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// will invoke the callback twice and create a potential race condition.
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//
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// ref: https://github.com/tendermint/tendermint/issues/5439
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func (r *ReqRes) GetCallback() func(*types.Response) {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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return r.cb
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}
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// SetDone marks the ReqRes object as done.
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func (r *ReqRes) SetDone() {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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close(r.signal)
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}
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