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grpc_client.go
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grpc_client.go
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package client
import (
"context"
"fmt"
"github.com/pkg/errors"
messagev1 "github.com/xmtp/proto/v3/go/message_api/v1"
"google.golang.org/grpc"
"google.golang.org/protobuf/proto"
)
type grpcClient struct {
grpc messagev1.MessageApiClient
}
func NewGRPCClient(ctx context.Context, dialFn func(context.Context) (*grpc.ClientConn, error)) (*grpcClient, error) {
conn, err := dialFn(ctx)
if err != nil {
return nil, err
}
return &grpcClient{
grpc: messagev1.NewMessageApiClient(conn),
}, nil
}
func (c *grpcClient) Close() error {
return nil
}
func (c *grpcClient) Subscribe(ctx context.Context, r *messagev1.SubscribeRequest) (Stream, error) {
ctx, cancel := context.WithCancel(ctx)
sub, err := c.grpc.Subscribe(ctx, r)
if err != nil {
cancel()
return nil, err
}
stream := &grpcStream{
cancel: cancel,
stream: sub,
}
// Wait for subscribe confirmation.
env, err := stream.Next(ctx)
cancel()
if err != nil {
if err == context.Canceled {
return nil, err
}
return nil, errors.Wrap(err, "waiting for subscribe confirmation")
}
if !proto.Equal(env, &messagev1.Envelope{}) {
return nil, fmt.Errorf("invalid subscribe confirmation: %s", env)
}
return stream, nil
}
func (c *grpcClient) SubscribeAll(ctx context.Context) (Stream, error) {
ctx, cancel := context.WithCancel(ctx)
stream, err := c.grpc.SubscribeAll(ctx, &messagev1.SubscribeAllRequest{})
if err != nil {
cancel()
return nil, err
}
return &grpcStream{
cancel: cancel,
stream: stream,
}, nil
}
func (c *grpcClient) Publish(ctx context.Context, r *messagev1.PublishRequest) (*messagev1.PublishResponse, error) {
return c.grpc.Publish(ctx, r)
}
func (c *grpcClient) Query(ctx context.Context, q *messagev1.QueryRequest) (*messagev1.QueryResponse, error) {
return c.grpc.Query(ctx, q)
}
func (c *grpcClient) BatchQuery(ctx context.Context, q *messagev1.BatchQueryRequest) (*messagev1.BatchQueryResponse, error) {
return c.grpc.BatchQuery(ctx, q)
}