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repro: cometbft http rpc client based query client implementation
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,96 @@ | ||
package comet_query | ||
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import ( | ||
"context" | ||
"encoding/json" | ||
"log" | ||
"pocket/pkg/either" | ||
"sync" | ||
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cometclient "github.com/cometbft/cometbft/rpc/client" | ||
comethttp "github.com/cometbft/cometbft/rpc/client/http" | ||
comettypes "github.com/cometbft/cometbft/rpc/core/types" | ||
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"pocket/pkg/client" | ||
"pocket/pkg/observable/channel" | ||
) | ||
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type cometQueryClient struct { | ||
client cometclient.Client | ||
observablesMu sync.Mutex | ||
observables map[string]client.EventsBytesObservable | ||
} | ||
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var _ client.EventsQueryClient = (*cometQueryClient)(nil) | ||
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func NewCometQueryClient(remote, wsEndpoint string) (client.EventsQueryClient, error) { | ||
cometHttpClient, err := comethttp.New(remote, wsEndpoint) | ||
if err != nil { | ||
return nil, err | ||
} | ||
if err := cometHttpClient.Start(); err != nil { | ||
return nil, err | ||
} | ||
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return &cometQueryClient{ | ||
client: cometHttpClient, | ||
observables: make(map[string]client.EventsBytesObservable), | ||
}, nil | ||
} | ||
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func (cClient *cometQueryClient) EventsBytes( | ||
ctx context.Context, | ||
query string, | ||
) (client.EventsBytesObservable, error) { | ||
cClient.observablesMu.Lock() | ||
defer cClient.observablesMu.Unlock() | ||
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if eventsObservable, ok := cClient.observables[query]; ok { | ||
return eventsObservable, nil | ||
} | ||
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cometEventsCh, err := cClient.client.Subscribe(ctx, query, query) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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eventsObservable, eventsProducer := channel.NewObservable[either.Either[[]byte]]() | ||
cClient.observables[query] = eventsObservable | ||
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go cClient.goProduceEvents(cometEventsCh, eventsProducer) | ||
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return eventsObservable, nil | ||
} | ||
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func (cClient *cometQueryClient) goProduceEvents( | ||
eventsCh <-chan comettypes.ResultEvent, | ||
eventsProducer chan<- either.Either[[]byte], | ||
) { | ||
for { | ||
select { | ||
case event, ok := <-eventsCh: | ||
if !ok { | ||
return | ||
} | ||
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eventJson, err := json.MarshalIndent(event, "", " ") | ||
if err != nil { | ||
eventsProducer <- either.Error[[]byte](err) | ||
} | ||
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log.Printf("events channel received, producing: %s", event) | ||
eventsProducer <- either.Success(eventJson) | ||
} | ||
} | ||
} | ||
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func (cClient *cometQueryClient) Close() { | ||
cClient.observablesMu.Lock() | ||
defer cClient.observablesMu.Unlock() | ||
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for _, obsvbl := range cClient.observables { | ||
obsvbl.UnsubscribeAll() | ||
} | ||
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_ = cClient.client.Stop() | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,50 @@ | ||
//go:build integration | ||
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package comet_query | ||
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import ( | ||
"context" | ||
"sync/atomic" | ||
"testing" | ||
"time" | ||
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"github.com/stretchr/testify/assert" | ||
"github.com/stretchr/testify/require" | ||
) | ||
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func TestCometQueryClient_EventsObservable(t *testing.T) { | ||
var ( | ||
newBlockQuery = "tm.event='NewBlock'" | ||
notifyTimeout = 5 * time.Second | ||
observedEventCounter = new(uint64) | ||
ctx = context.Background() | ||
) | ||
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cClient, err := NewCometQueryClient("tcp://localhost:36657", "/websocket") | ||
require.NoError(t, err) | ||
require.NotNil(t, cClient) | ||
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eventsObservable, err := cClient.EventsBytes(ctx, newBlockQuery) | ||
require.NoError(t, err) | ||
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testCtx, testDone := context.WithCancel(context.Background()) | ||
eventsObserver := eventsObservable.Subscribe(ctx) | ||
go func() { | ||
for eitherEvent := range eventsObserver.Ch() { | ||
event, err := eitherEvent.ValueOrError() | ||
assert.NoError(t, err) | ||
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t.Log("received event:") | ||
t.Logf("%s", event) | ||
atomic.AddUint64(observedEventCounter, 1) | ||
testDone() | ||
} | ||
}() | ||
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select { | ||
case <-testCtx.Done(): | ||
require.ErrorIs(t, ctx.Err(), context.Canceled) | ||
case <-time.After(notifyTimeout): | ||
t.Fatal("timeout waiting for error channel to receive") | ||
} | ||
} |