如何理解Fabric SDK开发中的resmgmt，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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resmgmt支持在Fabric网络上创建和更新资源。resmgmt允许管理员创建、更新通道，并允许Peer节点加入通道。管理员还可以在Peer节点上执行与链码相关的操作，例如安装，实例化和升级链码。
官方文档：
https://godoc.org/github.com/hyperledger/fabric-sdk-go/pkg/client/resmgmt
resmgmt使用基本流程如下：
A、准备客户端上下文
B、创建资源管理客户端
C、创建新通道
D、将Peer节点加入通道
E、将链码安装到Peer节点的文件系统
F、在通道上实例化链码
G、查询通道上的Peer节点，已安装/实例化的链码等
使用示例：
// Create new resource management client
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
// Read channel configuration
r, err := os.Open(channelConfig)
if err != nil {
fmt.Printf("failed to open channel config: %s\n", err)
}
defer r.Close()
// Create new channel 'mychannel'
_, err = c.SaveChannel(SaveChannelRequest{ChannelID: "mychannel", ChannelConfig: r})
if err != nil {
fmt.Printf("failed to save channel: %s\n", err)
}
peer := mockPeer()
// Peer joins channel 'mychannel'
err = c.JoinChannel("mychannel", WithTargets(peer))
if err != nil {
fmt.Printf("failed to join channel: %s\n", err)
}
// Install example chaincode to peer
installReq := InstallCCRequest{Name: "ExampleCC", Version: "v0", Path: "path", Package: &resource.CCPackage{Type: 1, Code: []byte("bytes")}}
_, err = c.InstallCC(installReq, WithTargets(peer))
if err != nil {
fmt.Printf("failed to install chaincode: %s\n", err)
}
// Instantiate example chaincode on channel 'mychannel'
ccPolicy := cauthdsl.SignedByMspMember("Org1MSP")
instantiateReq := InstantiateCCRequest{Name: "ExampleCC", Version: "v0", Path: "path", Policy: ccPolicy}
_, err = c.InstantiateCC("mychannel", instantiateReq, WithTargets(peer))
if err != nil {
fmt.Printf("failed to install chaincode: %s\n", err)
}
fmt.Println("Network setup completed")
// output:
// Network setup completed定义链码提案类型
type chaincodeProposalType int // Define chaincode proposal types const ( InstantiateChaincode chaincodeProposalType = iota UpgradeChaincode )
定义安装链码请求
// InstallCCRequest contains install chaincode request parameters
type InstallCCRequest struct {
Name string
Path string
Version string
Package *resource.CCPackage
}定义安装链码响应
// InstallCCResponse contains install chaincode response status
type InstallCCResponse struct {
Target string
Status int32
Info string
}定义实例化链码请求
// InstantiateCCRequest contains instantiate chaincode request parameters
type InstantiateCCRequest struct {
Name string
Path string
Version string
Args [][]byte
Policy *common.SignaturePolicyEnvelope
CollConfig []*common.CollectionConfig
}定义实例化链码响应
// InstantiateCCResponse contains response parameters for instantiate chaincode
type InstantiateCCResponse struct {
TransactionID fab.TransactionID
}定义升级链码请求
// UpgradeCCRequest contains upgrade chaincode request parameters
type UpgradeCCRequest struct {
Name string
Path string
Version string
Args [][]byte
Policy *common.SignaturePolicyEnvelope
CollConfig []*common.CollectionConfig
}定义升级链码响应
// UpgradeCCResponse contains response parameters for upgrade chaincode
type UpgradeCCResponse struct {
TransactionID fab.TransactionID
}定义创建通道请求
//SaveChannelRequest holds parameters for save channel request
type SaveChannelRequest struct {
ChannelID string
ChannelConfig io.Reader // ChannelConfig data source
ChannelConfigPath string // Convenience option to use the named file as ChannelConfig reader
SigningIdentities []msp.SigningIdentity // Users that sign channel configuration
}定义创建通道响应
// SaveChannelResponse contains response parameters for save channel
type SaveChannelResponse struct {
TransactionID fab.TransactionID
}func MarshalConfigSignature(signature *common.ConfigSignature) ([]byte, error)
MarshalConfigSignature为由[]byte级联的给定客户端打包一个ConfigSignature(配置签名)。func UnmarshalConfigSignature(reader io.Reader) (*common.ConfigSignature, error)
UnmarshalConfigSignature将从reader读取1个ConfigSignature为[]byte并将其解码。
type Client struct {
ctx context.Client
filter fab.TargetFilter
localCtxProvider context.LocalProvider
}
func New(ctxProvider context.ClientProvider, opts ...ClientOption) (*Client, error)New返回资源管理客户端实例。
使用示例：
ctx := mockClientProvider()
c, err := New(ctx)
if err != nil {
fmt.Println("failed to create client")
}
if c != nil {
fmt.Println("resource management client created")
}
// output:
// resource management client createdfunc (rc *Client) CreateConfigSignature(signer msp.SigningIdentity, channelConfigPath string) (*common.ConfigSignature, error)
CreateConfigSignature为指定的客户端、自定义签名者、channelConfigPath参数的通道配置创建一个签名。
返回由SDK在内部签名的ConfigSignature对象，可以传递给WithConfigSignatures（）选项。func (rc *Client) CreateConfigSignatureData(signer msp.SigningIdentity, channelConfigPath string) (signatureHeaderData resource.ConfigSignatureData, e error)
CreateConfigSignatureData将准备一个SignatureHeader和用于签名通道配置的完整签名数据。
一旦SigningBytes在外部签名（使用OpenSSL等外部工具签署signatureHeaderData.SigningBytes），需要执行以下操作：
A、创建一个common.ConfigSignature {}实例
B、使用返回的字段'signatureHeaderData.signatureHeader'为其SignatureHeader字段赋值。
C、使用外部工具生成的'signatureHeaderData.signingBytes'签名为其Signature字段赋值。
D、然后使用WithConfigSignatures（）选项传递此新实例以进行通道更新
func (rc *Client) InstallCC(req InstallCCRequest, options ...RequestOption) ([]InstallCCResponse, error)
InstallCC允许管理员将链代码安装到Peer节点的文件系统上。如果未在选项中指定Peer节点，默认属于管理员MSP的所有Peer节点。
参数:
req包含必备的链码名称，路径，版本和背书策略的相关信息
options包含可选的请求选项
返回：Peer回复的安装链码提案的响应
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
req := InstallCCRequest{Name: "ExampleCC", Version: "v0", Path: "path", Package: &resource.CCPackage{Type: 1, Code: []byte("bytes")}}
responses, err := c.InstallCC(req, WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to install chaincode: %s\n", err)
}
if len(responses) > 0 {
fmt.Println("Chaincode installed")
}
// output:
// Chaincode installedfunc (rc *Client) InstantiateCC(channelID string, req InstantiateCCRequest, options ...RequestOption) (InstantiateCCResponse, error)
InstantiateCC使用可选的自定义选项（指定Peer节点，过滤的Peer节点，超时）实例化链码。如果未在选项中指定Peer节点，则默认为所有通道Peer。
参数:
channelID是必备的通道名称
req包含必备的链码名称，路径，版本和背书策略的相关信息
options包含可选的请求选项
返回：带有交易ID的实例化链码响应
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
ccPolicy := cauthdsl.SignedByMspMember("Org1MSP")
req := InstantiateCCRequest{Name: "ExampleCC", Version: "v0", Path: "path", Policy: ccPolicy}
resp, err := c.InstantiateCC("mychannel", req)
if err != nil {
fmt.Printf("failed to install chaincode: %s\n", err)
}
if resp.TransactionID == "" {
fmt.Println("Failed to instantiate chaincode")
}
fmt.Println("Chaincode instantiated")
// output:
// Chaincode instantiatedfunc (rc *Client) JoinChannel(channelID string, options ...RequestOption) error
JoinChannel允许Peer节点使用可选的自定义选项（指定Peer节点，已过滤的Peer节点）加入现有通道。如果未在选项中指定Peer节点，则将默认为属于客户端MSP的所有Peer节点。
参数:
channelID是必备的通道名称
options包含可选的请求选项
返回：如果加入通道失败，返回错误
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
err = c.JoinChannel("mychannel", WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to join channel: %s\n", err)
}
fmt.Println("Joined channel")
// output:
// Joined channelfunc (rc *Client) QueryChannels(options ...RequestOption) (*pb.ChannelQueryResponse, error)
QueryChannels查询Peer节点已加入的所有通道的名称。
参数:
options包含可选的请求选项，注意，必须使用WithTargetURLs或WithTargets请求选项指定一个目标Peer节点。
返回：Peer节点加入的所有通道
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
response, err := c.QueryChannels(WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to query channels: %s\n", err)
}
if response != nil {
fmt.Println("Retrieved channels")
}
// output:
// Retrieved channelsfunc (rc *Client) QueryConfigFromOrderer(channelID string, options ...RequestOption) (fab.ChannelCfg, error)
QueryConfigFromOrderer从orderer节点返回通道配置。如果没有使用选项提供orderer节点，则将默认为通道的orderer节点（如果已配置）或随机从配置中选取orderer节点。
参数:
channelID是必备的通道ID
options包含可选的请求选项
返回通道的配置
func (rc *Client) QueryInstalledChaincodes(options ...RequestOption) (*pb.ChaincodeQueryResponse, error)
QueryInstalledChaincodes查询Peer节点上已安装的链码。
参数:
options包含可选的请求选项。注意，必须使用WithTargetURLs或WithTargets请求选项指定一个目标Peer节点。
返回：指定Peer节点上已安装的链码列表
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
response, err := c.QueryInstalledChaincodes(WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to query installed chaincodes: %s\n", err)
}
if response != nil {
fmt.Println("Retrieved installed chaincodes")
}
// output:
// Retrieved installed chaincodesfunc (rc *Client) QueryInstantiatedChaincodes(channelID string, options ...RequestOption) (*pb.ChaincodeQueryResponse, error)
QueryInstantiatedChaincodes在指定的通道的Peer节点上的查询实例化链码。如果没有在选项中指定Peer节点，则将在此通道上随机查询一个Peer节点。
参数:
channelID是必填通道名称
options包含可选的请求选项
返回实例化链码列表
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
response, err := c.QueryInstantiatedChaincodes("mychannel", WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to query instantiated chaincodes: %s\n", err)
}
if response != nil {
fmt.Println("Retrieved instantiated chaincodes")
}
// output:
// Retrieved instantiated chaincodesfunc (rc *Client) SaveChannel(req SaveChannelRequest, options ...RequestOption) (SaveChannelResponse, error)
SaveChannel创建或更新通道。
参数:
req包含必备的通道名称和配置的相关信息
options包含可选的请求选项
如果选项有签名（WithConfigSignatures（）或1个或多个WithConfigSignature（）调用），则SaveChannel将使用选项的签名而不是为req中找到的SigningIdentities创建一个签名。
确保req.ChannelConfigPath / req.ChannelConfig具有与签名匹配的通道配置。
返回带有交易ID的保存通道响应
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Printf("failed to create client: %s\n", err)
}
r, err := os.Open(channelConfig)
if err != nil {
fmt.Printf("failed to open channel config: %s\n", err)
}
defer r.Close()
resp, err := c.SaveChannel(SaveChannelRequest{ChannelID: "mychannel", ChannelConfig: r})
if err != nil {
fmt.Printf("failed to save channel: %s\n", err)
}
if resp.TransactionID == "" {
fmt.Println("Failed to save channel")
}
fmt.Println("Saved channel")
// output:
// Saved channel使用WithOrdererEndpoint
c, err := New(mockClientProvider())
if err != nil {
fmt.Printf("failed to create client: %s\n", err)
}
r, err := os.Open(channelConfig)
if err != nil {
fmt.Printf("failed to open channel config: %s\n", err)
}
defer r.Close()
resp, err := c.SaveChannel(SaveChannelRequest{ChannelID: "mychannel", ChannelConfig: r}, WithOrdererEndpoint("example.com"))
if err != nil {
fmt.Printf("failed to save channel: %s\n", err)
}
if resp.TransactionID == "" {
fmt.Println("Failed to save channel")
}
fmt.Println("Saved channel")
// output:
// Saved channelfunc (rc *Client) UpgradeCC(channelID string, req UpgradeCCRequest, options ...RequestOption) (UpgradeCCResponse, error)
UpgradeCC使用可选的自定义选项（指定Peer节点，过滤的Peer节点，超时）升级链码。如果没有在选项中指定Peer节点，则将默认为通道的所有Peer节点。
参数:
channelID是必备的通道名称
req包含必备的链码名称，路径，版本和背书策略的相关信息
options包含可选的请求选项
返回带有交易ID的升级链码响应
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
ccPolicy := cauthdsl.SignedByMspMember("Org1MSP")
req := UpgradeCCRequest{Name: "ExampleCC", Version: "v1", Path: "path", Policy: ccPolicy}
resp, err := c.UpgradeCC("mychannel", req, WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to upgrade chaincode: %s\n", err)
}
if resp.TransactionID == "" {
fmt.Println("Failed to upgrade chaincode")
}
fmt.Println("Chaincode upgraded")
// output:
// Chaincode upgradedtype ClientOption func(*Client) error // WithDefaultTargetFilter option to configure default target filter per client func WithDefaultTargetFilter(filter fab.TargetFilter) ClientOption
WithDefaultTargetFilter选项为每个客户端配置默认目标过滤器
使用示例：
ctx := mockClientProvider()
c, err := New(ctx, WithDefaultTargetFilter(&urlTargetFilter{url: "example.com"}))
if err != nil {
fmt.Println("failed to create client")
}
if c != nil {
fmt.Println("resource management client created with url target filter")
}
// output:
// resource management client created with url target filter//RequestOption func for each Opts argument
type RequestOption func(ctx context.Client, opts *requestOptions) error
type requestOptions struct {
Targets []fab.Peer // target peers
TargetFilter fab.TargetFilter // target filter
Orderer fab.Orderer // use specific orderer
Timeouts map[fab.TimeoutType]time.Duration //timeout options for resmgmt operations
ParentContext reqContext.Context //parent grpc context for resmgmt operations
Retry retry.Opts
// signatures for channel configurations, if set, this option will take precedence over signatures of SaveChannelRequest.SigningIdentities
Signatures []*common.ConfigSignature
}
func WithConfigSignatures(signatures ...*common.ConfigSignature) RequestOptionWithConfigSignatures允许为resmgmt客户端的SaveChannel调用提供预定义的签名。func WithOrderer(orderer fab.Orderer) RequestOption
WithOrderer允许为请求指定一个orderer节点。func WithOrdererEndpoint(key string) RequestOption
WithOrdererEndpoint允许为请求指定一个orderer节点。orderer将根据key参数查找。key参数可以是名称或url。func WithParentContext(parentContext reqContext.Context) RequestOption
WithParentContext封装了grpc父对象上下文
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
clientContext, err := mockClientProvider()()
if err != nil {
fmt.Println("failed to return client context")
return
}
// get parent context and cancel
parentContext, cancel := sdkCtx.NewRequest(clientContext, sdkCtx.WithTimeout(20*time.Second))
defer cancel()
channels, err := c.QueryChannels(WithParentContext(parentContext), WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to query for blockchain info: %s\n", err)
}
if channels != nil {
fmt.Println("Retrieved channels that peer belongs to")
}
// output:
// Retrieved channels that peer belongs tofunc WithRetry(retryOpt retry.Opts) RequestOption
WithRetry设置重试选项func WithTargets(targets ...fab.Peer) RequestOption
WithTargets允许覆盖请求的目标Peer节点。
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
response, err := c.QueryChannels(WithTargets(mockPeer()))
if err != nil {
fmt.Printf("failed to query channels: %s\n", err)
}
if response != nil {
fmt.Println("Retrieved channels")
}
// output:
// Retrieved channelsfunc WithTargetEndpoints(keys ...string) RequestOption
WithTargetEndpoints允许覆盖请求的目标Peer节点。目标由名称或URL指定，SDK将创建底层Peer节点对象。func WithTargetFilter(targetFilter fab.TargetFilter) RequestOption
WithTargetFilter为请求启用目标过滤器。
使用示例：
c, err := New(mockClientProvider())
if err != nil {
fmt.Println("failed to create client")
}
ccPolicy := cauthdsl.SignedByMspMember("Org1MSP")
req := InstantiateCCRequest{Name: "ExampleCC", Version: "v0", Path: "path", Policy: ccPolicy}
resp, err := c.InstantiateCC("mychannel", req, WithTargetFilter(&urlTargetFilter{url: "http://peer1.com"}))
if err != nil {
fmt.Printf("failed to install chaincode: %s\n", err)
}
if resp.TransactionID == "" {
fmt.Println("Failed to instantiate chaincode")
}
fmt.Println("Chaincode instantiated")
// output:
// Chaincode instantiatedfunc WithTimeout(timeoutType fab.TimeoutType, timeout time.Duration) RequestOption
WithTimeout封装了超时类型、超时时间的键值对到选项，如果未提供，则使用config的默认超时配置。
var (
sdk *fabsdk.FabricSDK
org = "org1"
user = "Admin"
)
// 区块链管理
func manageBlockchain() {
// 表明身份
ctx := sdk.Context(fabsdk.WithOrg(org), fabsdk.WithUser(user))
cli, err := resmgmt.New(ctx)
if err != nil {
panic(err)
}
// 具体操作
cli.SaveChannel(resmgmt.SaveChannelRequest{}, resmgmt.WithOrdererEndpoint("orderer.example.com"), resmgmt.WithTargetEndpoints())
}看完上述内容，你们掌握如何理解Fabric SDK开发中的resmgmt的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
