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376 lines
11 KiB
376 lines
11 KiB
package core
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import (
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"context"
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"fmt"
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"time"
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"github.com/pkg/errors"
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abci "github.com/tendermint/tendermint/abci/types"
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mempl "github.com/tendermint/tendermint/mempool"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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rpctypes "github.com/tendermint/tendermint/rpc/lib/types"
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"github.com/tendermint/tendermint/types"
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)
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//-----------------------------------------------------------------------------
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// NOTE: tx should be signed, but this is only checked at the app level (not by Tendermint!)
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// Returns right away, with no response. Does not wait for CheckTx nor
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// DeliverTx results.
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//
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// If you want to be sure that the transaction is included in a block, you can
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// subscribe for the result using JSONRPC via a websocket. See
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// https://tendermint.com/docs/app-dev/subscribing-to-events-via-websocket.html
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// If you haven't received anything after a couple of blocks, resend it. If the
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// same happens again, send it to some other node. A few reasons why it could
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// happen:
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//
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// 1. malicious node can drop or pretend it had committed your tx
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// 2. malicious proposer (not necessary the one you're communicating with) can
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// drop transactions, which might become valid in the future
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// (https://github.com/tendermint/tendermint/issues/3322)
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// 3. node can be offline
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//
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// Please refer to
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// https://tendermint.com/docs/tendermint-core/using-tendermint.html#formatting
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// for formatting/encoding rules.
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//
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//
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// ```shell
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// curl 'localhost:26657/broadcast_tx_async?tx="123"'
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// ```
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//
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// ```go
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// client := client.NewHTTP("tcp://0.0.0.0:26657", "/websocket")
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// err := client.Start()
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// if err != nil {
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// // handle error
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// }
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// defer client.Stop()
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// result, err := client.BroadcastTxAsync("123")
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "error": "",
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// "result": {
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// "hash": "E39AAB7A537ABAA237831742DCE1117F187C3C52",
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// "log": "",
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// "data": "",
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// "code": "0"
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// },
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// "id": "",
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// "jsonrpc": "2.0"
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// }
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// ```
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//
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// ### Query Parameters
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//
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// | Parameter | Type | Default | Required | Description |
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// |-----------+------+---------+----------+-----------------|
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// | tx | Tx | nil | true | The transaction |
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func BroadcastTxAsync(ctx *rpctypes.Context, tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
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err := mempool.CheckTx(tx, nil, mempl.TxInfo{})
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if err != nil {
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return nil, err
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}
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return &ctypes.ResultBroadcastTx{Hash: tx.Hash()}, nil
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}
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// Returns with the response from CheckTx. Does not wait for DeliverTx result.
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//
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// If you want to be sure that the transaction is included in a block, you can
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// subscribe for the result using JSONRPC via a websocket. See
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// https://tendermint.com/docs/app-dev/subscribing-to-events-via-websocket.html
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// If you haven't received anything after a couple of blocks, resend it. If the
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// same happens again, send it to some other node. A few reasons why it could
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// happen:
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//
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// 1. malicious node can drop or pretend it had committed your tx
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// 2. malicious proposer (not necessary the one you're communicating with) can
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// drop transactions, which might become valid in the future
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// (https://github.com/tendermint/tendermint/issues/3322)
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//
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// Please refer to
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// https://tendermint.com/docs/tendermint-core/using-tendermint.html#formatting
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// for formatting/encoding rules.
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//
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// ```shell
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// curl 'localhost:26657/broadcast_tx_sync?tx="456"'
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// ```
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//
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// ```go
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// client := client.NewHTTP("tcp://0.0.0.0:26657", "/websocket")
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// err := client.Start()
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// if err != nil {
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// // handle error
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// }
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// defer client.Stop()
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// result, err := client.BroadcastTxSync("456")
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "jsonrpc": "2.0",
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// "id": "",
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// "result": {
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// "code": "0",
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// "data": "",
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// "log": "",
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// "hash": "0D33F2F03A5234F38706E43004489E061AC40A2E"
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// },
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// "error": ""
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// }
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// ```
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//
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// ### Query Parameters
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//
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// | Parameter | Type | Default | Required | Description |
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// |-----------+------+---------+----------+-----------------|
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// | tx | Tx | nil | true | The transaction |
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func BroadcastTxSync(ctx *rpctypes.Context, tx types.Tx) (*ctypes.ResultBroadcastTx, error) {
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resCh := make(chan *abci.Response, 1)
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err := mempool.CheckTx(tx, func(res *abci.Response) {
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resCh <- res
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}, mempl.TxInfo{})
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if err != nil {
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return nil, err
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}
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res := <-resCh
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r := res.GetCheckTx()
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return &ctypes.ResultBroadcastTx{
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Code: r.Code,
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Data: r.Data,
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Log: r.Log,
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Hash: tx.Hash(),
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}, nil
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}
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// Returns with the responses from CheckTx and DeliverTx.
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//
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// IMPORTANT: use only for testing and development. In production, use
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// BroadcastTxSync or BroadcastTxAsync. You can subscribe for the transaction
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// result using JSONRPC via a websocket. See
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// https://tendermint.com/docs/app-dev/subscribing-to-events-via-websocket.html
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//
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// CONTRACT: only returns error if mempool.CheckTx() errs or if we timeout
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// waiting for tx to commit.
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//
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// If CheckTx or DeliverTx fail, no error will be returned, but the returned result
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// will contain a non-OK ABCI code.
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//
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// Please refer to
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// https://tendermint.com/docs/tendermint-core/using-tendermint.html#formatting
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// for formatting/encoding rules.
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//
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//
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// ```shell
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// curl 'localhost:26657/broadcast_tx_commit?tx="789"'
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// ```
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//
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// ```go
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// client := client.NewHTTP("tcp://0.0.0.0:26657", "/websocket")
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// err := client.Start()
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// if err != nil {
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// // handle error
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// }
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// defer client.Stop()
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// result, err := client.BroadcastTxCommit("789")
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "error": "",
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// "result": {
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// "height": "26682",
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// "hash": "75CA0F856A4DA078FC4911580360E70CEFB2EBEE",
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// "deliver_tx": {
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// "log": "",
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// "data": "",
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// "code": "0"
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// },
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// "check_tx": {
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// "log": "",
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// "data": "",
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// "code": "0"
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// }
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// },
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// "id": "",
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// "jsonrpc": "2.0"
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// }
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// ```
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//
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// ### Query Parameters
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//
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// | Parameter | Type | Default | Required | Description |
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// |-----------+------+---------+----------+-----------------|
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// | tx | Tx | nil | true | The transaction |
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func BroadcastTxCommit(ctx *rpctypes.Context, tx types.Tx) (*ctypes.ResultBroadcastTxCommit, error) {
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subscriber := ctx.RemoteAddr()
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if eventBus.NumClients() >= config.MaxSubscriptionClients {
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return nil, fmt.Errorf("max_subscription_clients %d reached", config.MaxSubscriptionClients)
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} else if eventBus.NumClientSubscriptions(subscriber) >= config.MaxSubscriptionsPerClient {
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return nil, fmt.Errorf("max_subscriptions_per_client %d reached", config.MaxSubscriptionsPerClient)
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}
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// Subscribe to tx being committed in block.
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subCtx, cancel := context.WithTimeout(ctx.Context(), SubscribeTimeout)
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defer cancel()
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q := types.EventQueryTxFor(tx)
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deliverTxSub, err := eventBus.Subscribe(subCtx, subscriber, q)
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if err != nil {
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err = errors.Wrap(err, "failed to subscribe to tx")
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logger.Error("Error on broadcast_tx_commit", "err", err)
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return nil, err
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}
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defer eventBus.Unsubscribe(context.Background(), subscriber, q)
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// Broadcast tx and wait for CheckTx result
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checkTxResCh := make(chan *abci.Response, 1)
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err = mempool.CheckTx(tx, func(res *abci.Response) {
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checkTxResCh <- res
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}, mempl.TxInfo{})
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if err != nil {
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logger.Error("Error on broadcastTxCommit", "err", err)
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return nil, fmt.Errorf("Error on broadcastTxCommit: %v", err)
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}
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checkTxResMsg := <-checkTxResCh
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checkTxRes := checkTxResMsg.GetCheckTx()
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if checkTxRes.Code != abci.CodeTypeOK {
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return &ctypes.ResultBroadcastTxCommit{
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CheckTx: *checkTxRes,
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DeliverTx: abci.ResponseDeliverTx{},
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Hash: tx.Hash(),
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}, nil
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}
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// Wait for the tx to be included in a block or timeout.
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select {
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case msg := <-deliverTxSub.Out(): // The tx was included in a block.
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deliverTxRes := msg.Data().(types.EventDataTx)
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return &ctypes.ResultBroadcastTxCommit{
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CheckTx: *checkTxRes,
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DeliverTx: deliverTxRes.Result,
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Hash: tx.Hash(),
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Height: deliverTxRes.Height,
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}, nil
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case <-deliverTxSub.Cancelled():
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var reason string
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if deliverTxSub.Err() == nil {
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reason = "Tendermint exited"
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} else {
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reason = deliverTxSub.Err().Error()
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}
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err = fmt.Errorf("deliverTxSub was cancelled (reason: %s)", reason)
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logger.Error("Error on broadcastTxCommit", "err", err)
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return &ctypes.ResultBroadcastTxCommit{
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CheckTx: *checkTxRes,
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DeliverTx: abci.ResponseDeliverTx{},
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Hash: tx.Hash(),
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}, err
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case <-time.After(config.TimeoutBroadcastTxCommit):
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err = errors.New("Timed out waiting for tx to be included in a block")
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logger.Error("Error on broadcastTxCommit", "err", err)
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return &ctypes.ResultBroadcastTxCommit{
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CheckTx: *checkTxRes,
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DeliverTx: abci.ResponseDeliverTx{},
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Hash: tx.Hash(),
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}, err
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}
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}
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// Get unconfirmed transactions (maximum ?limit entries) including their number.
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//
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// ```shell
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// curl 'localhost:26657/unconfirmed_txs'
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// ```
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//
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// ```go
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// client := client.NewHTTP("tcp://0.0.0.0:26657", "/websocket")
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// err := client.Start()
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// if err != nil {
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// // handle error
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// }
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// defer client.Stop()
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// result, err := client.UnconfirmedTxs()
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "result" : {
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// "txs" : [],
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// "total_bytes" : "0",
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// "n_txs" : "0",
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// "total" : "0"
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// },
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// "jsonrpc" : "2.0",
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// "id" : ""
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// }
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// ```
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//
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// ### Query Parameters
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//
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// | Parameter | Type | Default | Required | Description |
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// |-----------+------+---------+----------+--------------------------------------|
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// | limit | int | 30 | false | Maximum number of entries (max: 100) |
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// ```
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func UnconfirmedTxs(ctx *rpctypes.Context, limit int) (*ctypes.ResultUnconfirmedTxs, error) {
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// reuse per_page validator
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limit = validatePerPage(limit)
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txs := mempool.ReapMaxTxs(limit)
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return &ctypes.ResultUnconfirmedTxs{
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Count: len(txs),
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Total: mempool.Size(),
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TotalBytes: mempool.TxsBytes(),
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Txs: txs}, nil
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}
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// Get number of unconfirmed transactions.
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//
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// ```shell
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// curl 'localhost:26657/num_unconfirmed_txs'
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// ```
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//
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// ```go
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// client := client.NewHTTP("tcp://0.0.0.0:26657", "/websocket")
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// err := client.Start()
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// if err != nil {
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// // handle error
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// }
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// defer client.Stop()
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// result, err := client.UnconfirmedTxs()
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "jsonrpc" : "2.0",
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// "id" : "",
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// "result" : {
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// "n_txs" : "0",
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// "total_bytes" : "0",
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// "total" : "0"
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// "txs" : null,
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// }
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// }
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// ```
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func NumUnconfirmedTxs(ctx *rpctypes.Context) (*ctypes.ResultUnconfirmedTxs, error) {
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return &ctypes.ResultUnconfirmedTxs{
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Count: mempool.Size(),
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Total: mempool.Size(),
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TotalBytes: mempool.TxsBytes()}, nil
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}
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