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invoke.go
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invoke.go
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package hlfsdk
import (
"fmt"
"github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config"
"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
"os"
"strings"
)
func Invoke(user string, connectionProfilePath string, channelName string, chaincodeName string, fcn string, args string) (string, error) {
var payload string
var error error
fmt.Println(user)
if _, err := os.Stat(connectionProfilePath); os.IsNotExist(err) {
error = fmt.Errorf("file does not exist %v", err);
} else {
c := config.FromFile(connectionProfilePath)
// Create a fabric sdk client
sdk, err := fabsdk.New(c)
if err != nil { // If the sdk conection with the fabric network was not successful
error = fmt.Errorf("could not create sdk: %v", err)
sdk.Close()
} else {
defer sdk.Close() // We defer the closing of the connection to later
// We create a context to communicate with the channel
clientChannelContext := sdk.ChannelContext(channelName, fabsdk.WithUser(user))
// We create the channel client
client, err := channel.New(clientChannelContext)
if err != nil { // If channel client creation not successful
error = fmt.Errorf("could not create channel client: %v", err)
} else {
// We split the args string into array of strings and convert them to a byte of byte array
argArr := strings.Split(args, ",")
for i := range argArr {
argArr[i] = strings.TrimSpace(argArr[i])
}
queryArgs := make([][]byte, len(argArr))
for i, v := range argArr {
queryArgs[i] = []byte(v)
}
response, err := client.Execute(channel.Request{
ChaincodeID: chaincodeName,
Fcn: fcn,
Args: queryArgs,
})
if err != nil {
error = fmt.Errorf("query execution failed: %v", err)
} else {
payload = string(response.Payload)
}
}
}
}
return payload, error
}