Google Cloud Spanner 错误：会话池无效

Question

我有以下使用 Spanner 库的 Go 代码：

package main

import (
    "log/slog"
    "log"
    "fmt"
    "context"

    "cloud.google.com/go/spanner"
)


func createClient(ctx context.Context, db string) (*spanner.Client, error) {
    sessionPoolConfig := spanner.SessionPoolConfig{
        TrackSessionHandles: true,
        InactiveTransactionRemovalOptions: spanner.InactiveTransactionRemovalOptions{
            ActionOnInactiveTransaction: spanner.WarnAndClose,
        },
    }
    dataClient, err := spanner.NewClientWithConfig(
        ctx, db, spanner.ClientConfig{SessionPoolConfig: sessionPoolConfig},
    )
        if err != nil {
        slog.Error("failed to create the spanner client", "err", err)
                return nil, err
        }
        defer dataClient.Close()

        _ = dataClient

        return dataClient, nil
}

var dbLink = "projects/PROJECT_NAME/instances/INSTANCE_NAME/databases/DATABASE_NAME"

func main() {
    ctx := context.Background()

    snapperClient, err := createClient(ctx, dbLink)
    if err != nil {
        log.Fatalf("failed to create a spanner client, error=%s", err.Error())
}

    row, err := spannerClient.Single().ReadRow(ctx, "DATA_TABLE", spanner.Key{THE_KEY}, []string{"THE_COLUMN"})
    if err != nil {
        slog.Error("failed to get the DATA from spanner", "error", err.Error())
        return nil, err
}
...
}

这会导致以下错误日志：

2023/11/30 22:40:03 ERROR failed to get the DATA from spanner id=4 error="spanner: code = \"InvalidArgument\", desc = \"invalid session pool\""

我不相信该服务器甚至到达了 Google Cloud Spanner 指定的数据库，但我没有收到 Spanner 客户端创建错误。我该如何修复这个

invalid session pool

错误？

Answer 1

在返回之前，您将在

createClient

内关闭客户端。删除

defer dataClient.Close()

，它应该按您的预期工作。

func createClient(ctx context.Context, db string) (*spanner.Client, error) {
    sessionPoolConfig := spanner.SessionPoolConfig{
        TrackSessionHandles: true,
        InactiveTransactionRemovalOptions: spanner.InactiveTransactionRemovalOptions{
            ActionOnInactiveTransaction: spanner.WarnAndClose,
        },
    }
    dataClient, err := spanner.NewClientWithConfig(
        ctx, db, spanner.ClientConfig{SessionPoolConfig: sessionPoolConfig},
    )
    if err != nil {
        slog.Error("failed to create the spanner client", "err", err)
        return nil, err
    }
    // Remove this
    defer dataClient.Close()
    // Also this isn't doing anything
    _ = dataClient

    return dataClient, nil
}