Add a statediff streamer

This commit is contained in:
Elizabeth Engelman 2019-07-02 07:34:27 -05:00
parent 34f8e16c11
commit 9de631f3a7
3 changed files with 88 additions and 0 deletions

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// Copyright 2019 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package streamer
import (
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/statediff"
"github.com/vulcanize/vulcanizedb/pkg/core"
)
type Streamer interface {
Stream(chan statediff.Payload) (*rpc.ClientSubscription, error)
}
type StateDiffStreamer struct {
client core.RpcClient
}
func (streamer *StateDiffStreamer) Stream(payloadChan chan statediff.Payload) (*rpc.ClientSubscription, error) {
return streamer.client.Subscribe("statediff", payloadChan, "stream")
}
func NewStateDiffStreamer(client core.RpcClient) StateDiffStreamer {
return StateDiffStreamer{
client: client,
}
}

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// Copyright 2019 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package streamer_test
import (
"github.com/ethereum/go-ethereum/statediff"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/vulcanize/vulcanizedb/libraries/shared/streamer"
"github.com/vulcanize/vulcanizedb/pkg/fakes"
)
var _ = Describe("StateDiff Streamer", func() {
It("subscribes to the geth statediff service", func() {
client := &fakes.MockRpcClient{}
streamer := streamer.NewStateDiffStreamer(client)
payloadChan := make(chan statediff.Payload)
_, err := streamer.Stream(payloadChan)
Expect(err).NotTo(HaveOccurred())
client.AssertSubscribeCalledWith("statediff", payloadChan, []interface{}{"stream"})
})
})

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package streamer_test
import (
"testing"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
func TestStreamer(t *testing.T) {
RegisterFailHandler(Fail)
RunSpecs(t, "Streamer Suite")
}