func resolveUsingResolver(cluster *riak.Cluster) error {
// Note: a more sophisticated resolver would
// look into the objects to pick one, or perhaps
// present the list to a user to choose
cr := &FirstSiblingResolver{}
cmd, err := riak.NewFetchValueCommandBuilder().
WithBucketType("siblings").
WithBucket("nickelodeon").
WithKey("best_character").
WithConflictResolver(cr).
Build()
if err != nil {
return err
}
err = cluster.Execute(cmd)
if err != nil {
return err
}
fcmd := cmd.(*riak.FetchValueCommand)
// Test that the resolver just returned one riak.Object
vlen := len(fcmd.Response.Values)
if vlen != 1 {
return fmt.Errorf("expected 1 object, got %v", vlen)
}
obj := fcmd.Response.Values[0]
return storeObject(cluster, obj)
}
func (dao *LogIndexRiakDAO) fetch(userId string) *riak.FetchValueResponse {
cmd, _ := riak.NewFetchValueCommandBuilder().
WithBucket(dao.IndexBucket).
WithNotFoundOk(true).
WithKey(userId).
WithConflictResolver(dao.Resolver).
Build()
if err := dao.Cluster.Execute(cmd); err != nil {
logErr("Fetching timeline for "+userId, err)
return nil
}
fvc := cmd.(*riak.FetchValueCommand)
return fvc.Response
}
func fetchChampion(cluster *riak.Cluster) {
cmd, err := riak.NewFetchValueCommandBuilder().
WithBucketType("sports").
WithBucket("nba").
WithKey("champion").
Build()
if err != nil {
fmt.Println(err.Error())
return
}
if err := cluster.Execute(cmd); err != nil {
fmt.Println(err.Error())
return
}
fvc := cmd.(*riak.FetchValueCommand)
rsp := fvc.Response
var obj *riak.Object
if len(rsp.Values) > 0 {
obj = rsp.Values[0]
} else {
obj = &riak.Object{
ContentType: "text/plain",
Charset: "utf-8",
ContentEncoding: "utf-8",
Value: nil,
}
}
obj.Value = []byte("Harlem Globetrotters")
cmd, err = riak.NewStoreValueCommandBuilder().
WithBucketType("sports").
WithBucket("nba").
WithContent(obj).
Build()
if err != nil {
fmt.Println(err.Error())
return
}
if err := cluster.Execute(cmd); err != nil {
fmt.Println(err.Error())
return
}
}
func (dao *LogRecordRiakDao) GetLogRecord(logId string) (string, error) {
cmd, _ := riak.NewFetchValueCommandBuilder().
WithBucket(dao.LogBucket).
WithNotFoundOk(true).
WithKey(logId).
Build()
if err := dao.Cluster.Execute(cmd); err != nil {
logErr("Fetching log record for "+logId, err)
return "", err
}
fvc := cmd.(*riak.FetchValueCommand)
if fvc.Response == nil || fvc.Response.IsNotFound || len(fvc.Response.Values) == 0 {
return "", nil
}
return string(fvc.Response.Values[0].Value), nil
}
func doSearchRequest(cluster *riak.Cluster) error {
cmd, err := riak.NewSearchCommandBuilder().
WithIndexName("famous").
WithQuery("name_s:Lion*").
Build()
if err != nil {
return err
}
if err := cluster.Execute(cmd); err != nil {
return err
}
if err := printDocs(cmd, "Search Request Documents:"); err != nil {
return err
}
sc := cmd.(*riak.SearchCommand)
doc := sc.Response.Docs[0] // NB: SearchDoc struct type
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucketType(doc.BucketType).
WithBucket(doc.Bucket).
WithKey(doc.Key).
Build()
if err != nil {
return err
}
if err := cluster.Execute(cmd); err != nil {
return err
}
fc := cmd.(*riak.FetchValueCommand)
if json, jerr := json.MarshalIndent(fc.Response, "", " "); jerr != nil {
return jerr
} else {
fmt.Println(string(json))
}
return nil
}
func resolveChoosingFirst(cluster *riak.Cluster) error {
cmd, err := riak.NewFetchValueCommandBuilder().
WithBucketType("siblings").
WithBucket("nickelodeon").
WithKey("best_character").
Build()
if err != nil {
return err
}
err = cluster.Execute(cmd)
if err != nil {
return err
}
fcmd := cmd.(*riak.FetchValueCommand)
obj := fcmd.Response.Values[0]
return storeObject(cluster, obj)
}
func readSiblings(cluster *riak.Cluster) error {
cmd, err := riak.NewFetchValueCommandBuilder().
WithBucketType("siblings").
WithBucket("nickelodeon").
WithKey("best_character").
Build()
if err != nil {
return err
}
err = cluster.Execute(cmd)
if err != nil {
return err
}
fcmd := cmd.(*riak.FetchValueCommand)
fmt.Printf("[DevUsingConflictRes] nickelodeon/best_character has '%v' siblings\n", len(fcmd.Response.Values))
return nil
}
func fetchRufus(cluster *riak.Cluster) {
cmd, err := riak.NewFetchValueCommandBuilder().
WithBucketType("animals").
WithBucket("dogs").
WithKey("rufus").
Build()
if err != nil {
fmt.Println(err.Error())
return
}
if err := cluster.Execute(cmd); err != nil {
fmt.Println(err.Error())
return
}
fvc := cmd.(*riak.FetchValueCommand)
rsp := fvc.Response
fmt.Println(rsp.IsNotFound)
}
func updateCoach(cluster *riak.Cluster, team, newCoach string) error {
var cmd riak.Command
var err error
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucketType("siblings").
WithBucket("coaches").
WithKey(team).
Build()
if err != nil {
return err
}
if err := cluster.Execute(cmd); err != nil {
return err
}
fvc := cmd.(*riak.FetchValueCommand)
obj := fvc.Response.Values[0]
obj.Value = []byte(newCoach)
cmd, err = riak.NewStoreValueCommandBuilder().
WithBucketType("siblings").
WithBucket("coaches").
WithKey(team).
WithContent(obj).
Build()
if err != nil {
return err
}
if err := cluster.Execute(cmd); err != nil {
return err
}
return nil
}
func resolveViaOverwrite(cluster *riak.Cluster) error {
cmd, err := riak.NewFetchValueCommandBuilder().
WithBucketType("siblings").
WithBucket("nickelodeon").
WithKey("best_character").
Build()
if err != nil {
return err
}
err = cluster.Execute(cmd)
if err != nil {
return err
}
fcmd := cmd.(*riak.FetchValueCommand)
obj := fcmd.Response.Values[0]
// This overwrites the value and provides the canonical one
obj.Value = []byte("Stimpy")
return storeObject(cluster, obj)
}
func main() {
var err error
// un-comment-out to enable debug logging
// riak.EnableDebugLogging = true
o := &riak.NewClientOptions{
RemoteAddresses: []string{util.GetRiakAddress()},
}
var c *riak.Client
c, err = riak.NewClient(o)
if err != nil {
util.ErrExit(err)
}
defer func() {
if err := c.Stop(); err != nil {
util.ErrExit(err)
}
}()
val1 := uint32(1)
val1buf := make([]byte, 4)
binary.LittleEndian.PutUint32(val1buf, val1)
val2 := "two"
val3 := struct{ MyValue int }{3} // NB: ensure that members are exported (i.e. capitalized)
var val3json []byte
val3json, err = json.Marshal(val3)
if err != nil {
util.ErrExit(err)
}
bucket := "test"
util.Log.Println("Creating Objects In Riak...")
objs := []*riak.Object{
{
Bucket: bucket,
Key: "one",
ContentType: "application/octet-stream",
Value: val1buf,
},
{
Bucket: bucket,
Key: "two",
ContentType: "text/plain",
Value: []byte(val2),
},
{
Bucket: bucket,
Key: "three",
ContentType: "application/json",
Value: val3json,
},
}
var cmd riak.Command
wg := &sync.WaitGroup{}
for _, o := range objs {
cmd, err = riak.NewStoreValueCommandBuilder().
WithContent(o).
Build()
if err != nil {
util.ErrLog.Println(err)
continue
}
a := &riak.Async{
Command: cmd,
Wait: wg,
}
if err := c.ExecuteAsync(a); err != nil {
util.ErrLog.Println(err)
}
}
wg.Wait()
util.Log.Println("Reading Objects From Riak...")
d := make(chan riak.Command, len(objs))
for _, o := range objs {
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucket(bucket).
WithKey(o.Key).
Build()
if err != nil {
util.ErrLog.Println(err)
continue
}
a := &riak.Async{
Command: cmd,
Wait: wg,
Done: d,
}
if err := c.ExecuteAsync(a); err != nil {
util.ErrLog.Println(err)
}
}
wg.Wait()
close(d)
var obj3 *riak.Object
for done := range d {
f := done.(*riak.FetchValueCommand)
/* un-comment to dump fetched object as JSON
if json, jerr := json.MarshalIndent(f.Response, "", " "); err != nil {
util.ErrLog.Println(jerr)
} else {
util.Log.Println("fetched value: ", string(json))
}
*/
obj := f.Response.Values[0]
switch obj.Key {
case "one":
if actual, expected := binary.LittleEndian.Uint32(obj.Value), val1; actual != expected {
util.ErrLog.Printf("key: %s, actual %v, expected %v", obj.Key, actual, expected)
}
case "two":
if actual, expected := string(obj.Value), val2; actual != expected {
util.ErrLog.Printf("key: %s, actual %v, expected %v", obj.Key, actual, expected)
}
case "three":
obj3 = obj
val3.MyValue = 0
if jerr := json.Unmarshal(obj.Value, &val3); jerr != nil {
util.ErrLog.Println(jerr)
} else {
if actual, expected := val3.MyValue, int(3); actual != expected {
util.ErrLog.Printf("key: %s, actual %v, expected %v", obj.Key, actual, expected)
}
}
default:
util.ErrLog.Printf("unrecognized key: %s", obj.Key)
}
}
util.Log.Println("Updating Object Three In Riak...")
val3.MyValue = 42
obj3.Value, err = json.Marshal(val3)
if err != nil {
util.ErrExit(err)
}
cmd, err = riak.NewStoreValueCommandBuilder().
WithContent(obj3).
WithReturnBody(true).
Build()
if err != nil {
util.ErrLog.Println(err)
} else {
if err := c.Execute(cmd); err != nil {
util.ErrLog.Println(err)
}
}
svcmd := cmd.(*riak.StoreValueCommand)
svrsp := svcmd.Response
obj3 = svrsp.Values[0]
val3.MyValue = 0
if jerr := json.Unmarshal(obj3.Value, &val3); jerr != nil {
util.ErrLog.Println(jerr)
} else {
if actual, expected := val3.MyValue, int(42); actual != expected {
util.ErrLog.Printf("key: %s, actual %v, expected %v", obj3.Key, actual, expected)
}
}
util.Log.Println("updated object key: ", obj3.Key)
util.Log.Println("updated object value: ", val3.MyValue)
book := &Book{
ISBN: "1111979723",
Title: "Moby Dick",
Author: "Herman Melville",
Body: "Call me Ishmael. Some years ago...",
CopiesOwned: 3,
}
var jbook []byte
jbook, err = json.Marshal(book)
if err != nil {
util.ErrExit(err)
}
bookObj := &riak.Object{
Bucket: "books",
Key: book.ISBN,
ContentType: "application/json",
Value: jbook,
}
cmd, err = riak.NewStoreValueCommandBuilder().
WithContent(bookObj).
WithReturnBody(false).
Build()
if err != nil {
util.ErrLog.Println(err)
} else {
if err := c.Execute(cmd); err != nil {
util.ErrLog.Println(err)
}
}
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucket("books").
WithKey(book.ISBN).
Build()
if err != nil {
util.ErrExit(err)
}
if err := c.Execute(cmd); err != nil {
util.ErrLog.Println(err)
}
fcmd := cmd.(*riak.FetchValueCommand)
bookObj = fcmd.Response.Values[0]
util.Log.Println("serialized object: ", string(bookObj.Value))
util.Log.Println("Deleting Objects From Riak...")
objs = append(objs, bookObj)
for _, o := range objs {
cmd, err = riak.NewDeleteValueCommandBuilder().
WithBucket(o.Bucket).
WithKey(o.Key).
Build()
if err != nil {
util.ErrLog.Println(err)
continue
}
a := &riak.Async{
Command: cmd,
Wait: wg,
}
if err := c.ExecuteAsync(a); err != nil {
util.ErrLog.Println(err)
}
}
wg.Wait()
}
func main() {
var err error
var customerId string
util.Log.Println("Creating Data")
var cd time.Time
cd, err = time.Parse(timeFmt, "2013-10-01 14:30:26")
if err != nil {
util.ErrExit(err)
}
customer := &Customer{
Name: "John Smith",
Address: "123 Main Street",
City: "Columbus",
State: "Ohio",
Zip: "43210",
Phone: "+1-614-555-5555",
CreatedDate: cd,
}
util.Log.Printf("customer: %v", customer)
util.Log.Println("Starting Client")
// un-comment-out to enable debug logging
// riak.EnableDebugLogging = true
o := &riak.NewClientOptions{
RemoteAddresses: []string{util.GetRiakAddress()},
}
var c *riak.Client
c, err = riak.NewClient(o)
if err != nil {
util.ErrExit(err)
}
defer func() {
if err := c.Stop(); err != nil {
util.ErrExit(err)
}
}()
util.Log.Println("Storing Customer")
var cmd riak.Command
var customerJson []byte
customerJson, err = json.Marshal(customer)
if err != nil {
util.ErrExit(err)
}
obj := &riak.Object{
Bucket: customersBucket,
ContentType: "application/json",
Value: customerJson,
}
cmd, err = riak.NewStoreValueCommandBuilder().
WithContent(obj).
WithReturnBody(true).
Build()
if err != nil {
util.ErrExit(err)
}
if eerr := c.Execute(cmd); eerr != nil {
util.ErrExit(eerr)
}
svc := cmd.(*riak.StoreValueCommand)
customerId = svc.Response.GeneratedKey
if customerId == "" {
util.ErrExit(errors.New("expected generated customer Id"))
} else {
util.Log.Println("Customer ID:", customerId)
}
util.Log.Println("Storing Data")
var orders []*Order
orders, err = createOrders(customerId)
if err != nil {
util.ErrExit(err)
}
var orderSummary *OrderSummary
var orderSummaryJson []byte
orderSummary = createOrderSummary(customerId, orders)
ccmds := 1 + len(orders)
cmds := make([]riak.Command, ccmds)
// command to store OrderSummary
orderSummaryJson, err = json.Marshal(orderSummary)
if err != nil {
util.ErrExit(err)
}
obj = &riak.Object{
Bucket: orderSummariesBucket,
Key: customerId,
ContentType: "application/json",
Value: orderSummaryJson,
}
cmds[0], err = riak.NewStoreValueCommandBuilder().
WithContent(obj).
Build()
if err != nil {
util.ErrExit(err)
}
for i, order := range orders {
// command to store Order
var orderJson []byte
orderJson, err = json.Marshal(order)
if err != nil {
util.ErrExit(err)
}
obj = &riak.Object{
Bucket: ordersBucket,
Key: order.Id,
ContentType: "application/json",
Value: orderJson,
}
cmds[i+1], err = riak.NewStoreValueCommandBuilder().
WithContent(obj).
Build()
if err != nil {
util.ErrExit(err)
}
}
errored := false
wg := &sync.WaitGroup{}
for _, cmd := range cmds {
a := &riak.Async{
Command: cmd,
Wait: wg,
}
if eerr := c.ExecuteAsync(a); eerr != nil {
errored = true
util.ErrLog.Println(eerr)
}
}
wg.Wait()
if errored {
util.ErrExit(errors.New("error, exiting!"))
}
util.Log.Println("Fetching related data by shared key")
cmds = cmds[:0]
// fetch customer
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucket(customersBucket).
WithKey(customerId).
Build()
if err != nil {
util.ErrExit(err)
}
cmds = append(cmds, cmd)
// fetch OrderSummary
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucket(orderSummariesBucket).
WithKey(customerId).
Build()
if err != nil {
util.ErrExit(err)
}
cmds = append(cmds, cmd)
doneChan := make(chan riak.Command)
errored = false
for _, cmd := range cmds {
a := &riak.Async{
Command: cmd,
Done: doneChan,
}
if eerr := c.ExecuteAsync(a); eerr != nil {
errored = true
util.ErrLog.Println(eerr)
}
}
if errored {
util.ErrExit(errors.New("error, exiting!"))
}
for i := 0; i < len(cmds); i++ {
select {
case d := <-doneChan:
if fv, ok := d.(*riak.FetchValueCommand); ok {
obj := fv.Response.Values[0]
switch obj.Bucket {
case customersBucket:
util.Log.Printf("Customer 1: %v", string(obj.Value))
case orderSummariesBucket:
util.Log.Printf("OrderSummary 1: %v", string(obj.Value))
}
} else {
util.ErrExit(fmt.Errorf("unknown response command type: %v", reflect.TypeOf(d)))
}
case <-time.After(5 * time.Second):
util.ErrExit(errors.New("fetch operations took too long"))
}
}
util.Log.Println("Adding Index Data")
// fetch orders to add index data
cmds = cmds[:0]
for _, order := range orders {
cmd, err = riak.NewFetchValueCommandBuilder().
WithBucket(ordersBucket).
WithKey(order.Id).
Build()
if err != nil {
util.ErrExit(err)
}
cmds = append(cmds, cmd)
}
errored = false
for _, cmd := range cmds {
a := &riak.Async{
Command: cmd,
Done: doneChan,
}
if eerr := c.ExecuteAsync(a); eerr != nil {
errored = true
util.ErrLog.Println(eerr)
}
}
if errored {
util.ErrExit(errors.New("error, exiting!"))
}
errored = false
for i := 0; i < len(cmds); i++ {
select {
case d := <-doneChan:
if fv, ok := d.(*riak.FetchValueCommand); ok {
obj := fv.Response.Values[0]
switch obj.Key {
case "1":
obj.AddToIntIndex("SalespersonId_int", 9000)
obj.AddToIndex("OrderDate_bin", "2013-10-01")
case "2":
obj.AddToIntIndex("SalespersonId_int", 9001)
obj.AddToIndex("OrderDate_bin", "2013-10-15")
case "3":
obj.AddToIntIndex("SalespersonId_int", 9000)
obj.AddToIndex("OrderDate_bin", "2013-11-03")
}
scmd, serr := riak.NewStoreValueCommandBuilder().
WithContent(obj).
Build()
if serr != nil {
util.ErrExit(serr)
}
a := &riak.Async{
Command: scmd,
Wait: wg,
}
if eerr := c.ExecuteAsync(a); eerr != nil {
errored = true
util.ErrLog.Println(eerr)
}
} else {
util.ErrExit(fmt.Errorf("unknown response command type: %v", reflect.TypeOf(d)))
}
case <-time.After(5 * time.Second):
util.ErrExit(errors.New("fetch operations took too long"))
}
}
if errored {
util.ErrExit(errors.New("error, exiting!"))
}
wg.Wait()
close(doneChan)
util.Log.Println("Index Queries")
cmd, err = riak.NewSecondaryIndexQueryCommandBuilder().
WithBucket(ordersBucket).
WithIndexName("SalespersonId_int").
WithIndexKey("9000").
Build()
if err != nil {
util.ErrExit(err)
}
if eerr := c.Execute(cmd); eerr != nil {
util.ErrExit(eerr)
}
qcmd := cmd.(*riak.SecondaryIndexQueryCommand)
for _, rslt := range qcmd.Response.Results {
util.Log.Println("Jane's Orders, key: ", string(rslt.ObjectKey))
}
cmd, err = riak.NewSecondaryIndexQueryCommandBuilder().
WithBucket(ordersBucket).
WithIndexName("OrderDate_bin").
WithRange("2013-10-01", "2013-10-31").
Build()
if err != nil {
util.ErrExit(err)
}
if eerr := c.Execute(cmd); eerr != nil {
util.ErrExit(eerr)
}
qcmd = cmd.(*riak.SecondaryIndexQueryCommand)
for _, rslt := range qcmd.Response.Results {
util.Log.Println("October's Orders, key: ", string(rslt.ObjectKey))
}
}