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package client_test
import (
"bytes"
"context"
"fmt"
"log"
"github.com/tendermint/tendermint/abci/example/kvstore"
rpchttp "github.com/tendermint/tendermint/rpc/client/http"
ctypes "github.com/tendermint/tendermint/rpc/core/types"
rpctest "github.com/tendermint/tendermint/rpc/test"
)
func ExampleHTTP_simple() {
// Start a tendermint node (and kvstore) in the background to test against
app := kvstore.NewApplication()
node := rpctest.StartTendermint(app, rpctest.SuppressStdout, rpctest.RecreateConfig)
defer rpctest.StopTendermint(node)
// Create our RPC client
rpcAddr := rpctest.GetConfig().RPC.ListenAddress
c, err := rpchttp.New(rpcAddr)
if err != nil {
log.Fatal(err) //nolint:gocritic
}
// Create a transaction
k := []byte("name")
v := []byte("satoshi")
tx := append(k, append([]byte("="), v...)...)
// Broadcast the transaction and wait for it to commit (rather use
// c.BroadcastTxSync though in production).
bres, err := c.BroadcastTxCommit(context.Background(), tx)
if err != nil {
log.Fatal(err)
}
if bres.CheckTx.IsErr() || bres.DeliverTx.IsErr() {
log.Fatal("BroadcastTxCommit transaction failed")
}
// Now try to fetch the value for the key
qres, err := c.ABCIQuery(context.Background(), "/key", k)
if err != nil {
log.Fatal(err)
}
if qres.Response.IsErr() {
log.Fatal("ABCIQuery failed")
}
if !bytes.Equal(qres.Response.Key, k) {
log.Fatal("returned key does not match queried key")
}
if !bytes.Equal(qres.Response.Value, v) {
log.Fatal("returned value does not match sent value")
}
fmt.Println("Sent tx :", string(tx))
fmt.Println("Queried for :", string(qres.Response.Key))
fmt.Println("Got value :", string(qres.Response.Value))
// Output:
// Sent tx : name=satoshi
// Queried for : name
// Got value : satoshi
}
func ExampleHTTP_batching() {
// Start a tendermint node (and kvstore) in the background to test against
app := kvstore.NewApplication()
node := rpctest.StartTendermint(app, rpctest.SuppressStdout, rpctest.RecreateConfig)
// Create our RPC client
rpcAddr := rpctest.GetConfig().RPC.ListenAddress
c, err := rpchttp.New(rpcAddr)
if err != nil {
log.Fatal(err)
}
defer rpctest.StopTendermint(node)
// Create our two transactions
k1 := []byte("firstName")
v1 := []byte("satoshi")
tx1 := append(k1, append([]byte("="), v1...)...)
k2 := []byte("lastName")
v2 := []byte("nakamoto")
tx2 := append(k2, append([]byte("="), v2...)...)
txs := [][]byte{tx1, tx2}
// Create a new batch
batch := c.NewBatch()
// Queue up our transactions
for _, tx := range txs {
// Broadcast the transaction and wait for it to commit (rather use
// c.BroadcastTxSync though in production).
if _, err := batch.BroadcastTxCommit(context.Background(), tx); err != nil {
log.Fatal(err) //nolint:gocritic
}
}
// Send the batch of 2 transactions
if _, err := batch.Send(context.Background()); err != nil {
log.Fatal(err)
}
// Now let's query for the original results as a batch
keys := [][]byte{k1, k2}
for _, key := range keys {
if _, err := batch.ABCIQuery(context.Background(), "/key", key); err != nil {
log.Fatal(err)
}
}
// Send the 2 queries and keep the results
results, err := batch.Send(context.Background())
if err != nil {
log.Fatal(err)
}
// Each result in the returned list is the deserialized result of each
// respective ABCIQuery response
for _, result := range results {
qr, ok := result.(*ctypes.ResultABCIQuery)
if !ok {
log.Fatal("invalid result type from ABCIQuery request")
}
fmt.Println(string(qr.Response.Key), "=", string(qr.Response.Value))
}
// Output:
// firstName = satoshi
// lastName = nakamoto
}