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hyperledger-fabric - 如何从另一个渠道获取查询结果

问题描述

当我想在我的结构中获取查询结果时遇到了麻烦。我有 2 个频道，频道 1 存储帐户数据，频道 2 存储一些内容及其成本。我在频道1，我想在频道2中查询一个内容的费用，然后在频道1中“购买”它。例如，频道1有一个帐户A，他有20美元，频道2有一个电影费用9美元，A想查询电影的成本，然后“购买”它，所以 A 现在只有 11 美元。但现在我不知道如何从 channel2 获得“$9”。我该怎么做？

标签： hyperledger-fabric

解决方案

Fabric 使用通道作为一种隔离形式。如何使用“InvokeChaincode”API 调用另一个链码。

// InvokeChaincode locally calls the specified chaincode `Invoke` using the
    // same transaction context; that is, chaincode calling chaincode doesn't
    // create a new transaction message.
    // If the called chaincode is on the same channel, it simply adds the called
    // chaincode read set and write set to the calling transaction.
    // If the called chaincode is on a different channel,
    // only the Response is returned to the calling chaincode; any PutState calls
    // from the called chaincode will not have any effect on the ledger; that is,
    // the called chaincode on a different channel will not have its read set
    // and write set applied to the transaction. Only the calling chaincode's
    // read set and write set will be applied to the transaction. Effectively
    // the called chaincode on a different channel is a `Query`, which does not
    // participate in state validation checks in subsequent commit phase.
    // If `channel` is empty, the caller's channel is assumed.
    InvokeChaincode(chaincodeName string, args [][]byte, channel string) pb.Response

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