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watch.go
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watch.go
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// Copyright (C) 2023 Gobalsky Labs Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package commands
import (
"context"
"encoding/json"
"errors"
"fmt"
"code.vegaprotocol.io/vega/core/blockchain/abci"
tmctypes "github.com/cometbft/cometbft/rpc/core/types"
"github.com/jessevdk/go-flags"
)
type watch struct {
Address string `default:"tcp://0.0.0.0:26657" description:"Node address" long:"address" short:"a"`
Positional struct {
Filters []string `positional-arg-name:"<FILTERS>"`
} `positional-args:"true"`
}
func (opts *watch) Execute(_ []string) error {
args := opts.Positional.Filters
if len(args) == 0 {
return errors.New("error: watch requires at least one filter")
}
c, err := abci.NewClient(opts.Address)
if err != nil {
return fmt.Errorf("could not instantiate abci client: %w", err)
}
ctx := context.Background()
fn := func(e tmctypes.ResultEvent) error {
bz, err := json.Marshal(e.Data)
if err != nil {
return err
}
fmt.Printf("%s\n", bz)
return nil
}
if err := c.Subscribe(ctx, fn, args...); err != nil {
return err
}
return nil
}
func Watch(ctx context.Context, parser *flags.Parser) error {
var (
shortDesc = "Watches events from Tendermint"
longDesc = `Events results are encoded in JSON and can be filtered
using a simple query language. You can use one or more filters.
See https://docs.tendermint.com/master/app-dev/subscribing-to-events-via-websocket.html
for more information about the query syntax.
Example:
watch "tm.event = 'NewBlock'" "tm.event = 'Transaction'"`
)
_, err := parser.AddCommand("watch", shortDesc, longDesc, &watch{})
return err
}