json - Hyperledger Fabric JSON 响应有反斜杠
问题描述
我目前正在测试一个 Hyperledger Fabric 应用程序,但我收到了意外的 JSON 响应。为什么响应中的每个对象之间都有额外的反斜杠?
result, err := json.Marshal(history)
logger.Debug(string(result))
if err != nil {
message := fmt.Sprintf("unable to marshal the result: %s", err.Error())
logger.Error(message)
return shim.Error(message)
}
logger.Info("SimpleChaincode.getHistory exited successfully")
return shim.Success(result)
实际 CLI 输出:
Chaincode invoke successful. result: status:200 payload:"[{\"type\":\"history\",\"key\":\"key\",\"values\":[{\"tx_id\":\"723a398362282d92f7b05b821fc8f835736b6068e5d1b72d105fc86d6e57d64e\",\"value\":\"initial_value\",\"is_delete\":false}]}]"
预期的 CLI 结果:
Chaincode invoke successful.
result: status:200
payload:
[
{
"type":"history",
"key":"key",
"values":[
{
"tx_id":"723a398362282d92f7b05b821fc8f835736b6068e5d1b72d105fc86d6e57d64e",
"value":"initial_value",
"is_delete":false
}
]
}
]
码头工人日志:
2020-08-19 14:40:18.823 UTC [SimpleChaincode] Debug -> DEBU 015 [{"type":"history","key":"key","values":[{"tx_id":"723a398362282d92f7b05b821fc8f835736b6068e5d1b72d105fc86d6e57d64e","value":"initial_value","is_delete":false}]}]
2020-08-19 14:40:18.823 UTC [SimpleChaincode] Info -> INFO 016 SimpleChaincode.getHistory exited successfully
解决方案
记录格式
peer 和 orderer 命令的日志格式是通过 FABRIC_LOGGING_FORMAT 环境变量控制的。这个可以设置成格式字符串,比如默认
"%{color}%{time:2006-01-02 15:04:05.000 MST} [%{module}] %{shortfunc} -> %{level:.4s} %{id:03x}%{color:reset} %{message}"
以人类可读的控制台格式打印日志。也可以设置为 json 以 JSON 格式输出日志。
链接:https ://hyperledger-fabric.readthedocs.io/en/release-2.2/logging-control.html#logging-format
您可以更新 core.yaml,也可以在 docker compose 文件中使用“FABRIC_LOGGING_FORMAT”。
下面给出了 core.yaml 的示例:
# Logging section for the chaincode container
logging:
# Default level for all loggers within the chaincode container
level: info
# Override default level for the 'shim' logger
shim: warning
# Format for the chaincode container logs
format: json
您可以在“fabric-samples/config”目录中找到 core.yaml。
链接:https ://github.com/hyperledger/fabric/blob/master/sampleconfig/core.yaml
如果您下载最新的 Fabric 示例,您可以在“fabric-samples/config”目录中找到示例 core.yaml。
下面给出了 docker compose 文件中带有“FABRIC_LOGGING_FORMAT”的示例:您必须使用“-FABRIC_LOGGING_FORMAT=json”编辑 cli 容器的环境
cli:
container_name: cli
image: hyperledger/fabric-tools:$IMAGE_TAG
tty: true
stdin_open: true
environment:
- GOPATH=/opt/gopath
- CORE_VM_ENDPOINT=unix:///host/var/run/docker.sock
#- FABRIC_LOGGING_SPEC=DEBUG
- FABRIC_LOGGING_FORMAT=json
- FABRIC_LOGGING_SPEC=INFO
- CORE_PEER_ID=cli
- CORE_PEER_ADDRESS=peer0.org1.example.com:7051
- CORE_PEER_LOCALMSPID=Org1MSP
- CORE_PEER_TLS_ENABLED=true
- CORE_PEER_TLS_CERT_FILE=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/server.crt
- CORE_PEER_TLS_KEY_FILE=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/server.key
- CORE_PEER_TLS_ROOTCERT_FILE=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt
- CORE_PEER_MSPCONFIGPATH=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp
working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
command: /bin/bash
volumes:
- /var/run/:/host/var/run/
- ./../chaincode/:/opt/gopath/src/github.com/hyperledger/fabric-samples/chaincode
- ./crypto-config:/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/
- ./scripts:/opt/gopath/src/github.com/hyperledger/fabric/peer/scripts/
- ./channel-artifacts:/opt/gopath/src/github.com/hyperledger/fabric/peer/channel-artifacts
depends_on:
- orderer.example.com
- peer0.org1.example.com
- peer1.org1.example.com
- peer0.org2.example.com
- peer1.org2.example.com
networks:
- byfn
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