File download

To Download the file, you need to provide the unique hash of the data(Fid), which will be returned to you when the data is uploaded successfully.

Here is the sample code to retrieve the data:

package main

import (
	"context"
	"fmt"

	cess "github.com/CESSProject/cess-go-sdk"
)

// Substrate well-known mnemonic:
//
//	https://github.com/substrate-developer-hub/substrate-developer-hub.github.io/issues/613
var MY_MNEMONIC = "bottom drive obey lake curtain smoke basket hold race lonely fit walk"

var RPC_ADDRS = []string{
	"wss://testnet-rpc0.cess.cloud/ws/",
	"wss://testnet-rpc1.cess.cloud/ws/",
	"wss://testnet-rpc2.cess.cloud/ws/",
}

const oss_url = "http://deoss-pub-gateway.cess.cloud/"
const file_hash = "c158d7008e94d3af61033b6861aa4f35a4c2b829c7e97224fcbb54618de55945"

func main() {
	sdk, err := cess.New(
		context.Background(),
		cess.ConnectRpcAddrs(RPC_ADDRS),
		cess.Mnemonic(MY_MNEMONIC),
	)
	if err != nil {
		panic(err)
	}
	// download file
	fmt.Println(sdk.RetrieveFile(oss_url, file_hash, "download_file"))
}