func (self *FrontServer) Following(who string) ([]string, error) {
_, e := self.findUser(who)
if e != nil {
return nil, e
}
client := self.storageClient.Bin(who)
followingUsers := trib.List{L: []string{}}
if e := client.ListGet("Followings", &followingUsers); e != nil {
return nil, e
}
followingUsers.L = removeDuplicates(followingUsers.L)
return followingUsers.L, nil
}
func (self *ReplicaClient) Get(key string, value *string) error {
newkey := colon.Escape(self.name) + "::" + key + "valu" // <- key should escape as well! NVM
var mylist trib.List
mylist.L = make([]string, 0)
// get the list of logs of the key
for index, ad := range self.addr {
tempclient := &client{ad}
err1 := tempclient.ListGet(newkey, &mylist)
if err1 == nil {
break
} else if index < len(self.addr)-1 {
continue
} else {
return err1
}
}
s := ""
if len(mylist.L) == 0 {
*value = s
return nil
}
// add dedup
mylist.L = removeDuplicates(mylist.L)
loglist := make(LogSlice, len(mylist.L))
// decode the logs
for index, l := range mylist.L {
loglist[index] = DecodeLog(l)
}
sort.Sort(loglist)
index := len(loglist) - 1
result := loglist[index].Val
*value = result
return nil
}
func (self *client) ListGet(key string, list *trib.List) error {
// connect to the server
conn, e := rpc.DialHTTP("tcp", self.addr)
if e != nil {
return e
}
// perform the call
list.L = nil
e = conn.Call("Storage.ListGet", key, list)
if e != nil {
conn.Close()
return e
}
if list.L == nil {
list.L = []string{}
}
// close the connection
return conn.Close()
}
func (self *Storage) ListGet(key string, ret *trib.List) error {
self.listLock.Lock()
defer self.listLock.Unlock()
if lst, found := self.lists[key]; !found {
ret.L = []string{}
} else {
ret.L = make([]string, 0, lst.Len())
for i := lst.Front(); i != nil; i = i.Next() {
ret.L = append(ret.L, i.Value.(string))
}
}
if Logging {
log.Printf("ListGet(%q) => %d", key, len(ret.L))
for i, s := range ret.L {
log.Printf(" %d: %q", i, s)
}
}
return nil
}
func (self *FrontServer) Home(user string) ([]*trib.Trib, error) {
self.lock.Lock()
defer self.lock.Unlock()
_, e := self.findUser(user)
if e != nil {
return nil, e
}
followingUsers, e := self.Following(user)
if e != nil {
return nil, e
}
followingUsers = append(followingUsers, user)
wholeRawList := trib.List{L: []string{}}
for _, followed := range followingUsers {
client := self.storageClient.Bin(followed)
rawList := trib.List{L: []string{}}
if e := client.ListGet("Tribs", &rawList); e != nil {
return nil, e
}
wholeRawList.L = append(wholeRawList.L, rawList.L...)
}
size := len(wholeRawList.L)
tribList := make([]*trib.Trib, size)
for i, entry := range wholeRawList.L {
if e := json.Unmarshal([]byte(entry), &tribList[i]); e != nil {
return nil, e
}
}
// sort by logic clock
sort.Sort(byClock(tribList))
l := len(tribList)
start := 0
if l > trib.MaxTribFetch {
start = l - trib.MaxTribFetch
}
return tribList[start:], nil
}
func (self *Storage) ListKeys(p *trib.Pattern, r *trib.List) error {
self.listLock.Lock()
defer self.listLock.Unlock()
ret := make([]string, 0, len(self.lists))
for k := range self.lists {
if p.Match(k) {
ret = append(ret, k)
}
}
r.L = ret
if Logging {
log.Printf("ListKeys(%q, %q) => %d", p.Prefix, p.Suffix, len(r.L))
for i, s := range r.L {
log.Printf(" %d: %q", i, s)
}
}
return nil
}
func (self *ReplicaClient) ListKeys(p *trib.Pattern, list *trib.List) error {
// escape colon
binName := colon.Escape(self.name)
p.Prefix = binName + "::" + p.Prefix
p.Suffix = p.Suffix + "list"
// RPC call
// get the list of logs of the key
// a list used as temp storage
tmpList := trib.List{make([]string, 0)}
for index, ad := range self.addr {
tempclient := &client{ad}
err1 := tempclient.ListKeys(p, &tmpList)
if err1 == nil {
break
} else if index < len(self.addr)-1 {
continue
} else {
return err1
}
}
blockCh := make(chan string, len(tmpList.L))
for _, str := range tmpList.L {
go func(str string) {
tmpList2 := trib.List{make([]string, 0)}
s1 := colon.Escape(self.name) + "::"
s2 := "list"
str = strings.TrimPrefix(str, s1)
str = strings.TrimSuffix(str, s2)
_ = self.ListGet(str, &tmpList2) // ignore this err?
if len(tmpList2.L) != 0 {
blockCh <- str
} else {
blockCh <- ""
}
}(str)
}
list.L = make([]string, 0, len(tmpList.L))
for _ = range tmpList.L {
result := <-blockCh
if result != "" {
list.L = append(list.L, result)
}
}
// unescape and trim
if len(list.L) > 0 {
for i, str := range list.L {
//str = colon.Unescape(str)
s1 := colon.Escape(self.name) + "::"
s2 := "valu"
str = strings.TrimPrefix(str, s1)
str = strings.TrimSuffix(str, s2)
list.L[i] = str
}
}
return nil
}
func (self *ReplicaClient) ListGet(key string, list *trib.List) error {
newkey := colon.Escape(self.name) + "::" + key + "list"
var mylist trib.List
mylist.L = make([]string, 0)
// get the list of logs of the key
for index, ad := range self.addr {
tempclient := &client{ad}
err1 := tempclient.ListGet(newkey, &mylist)
if err1 == nil {
break
} else if index < len(self.addr)-1 {
continue
} else {
return err1
}
}
if len(mylist.L) == 0 {
list.L = make([]string, 0)
return nil
}
// add dedup
mylist.L = removeDuplicates(mylist.L)
loglist := make(LogSlice, len(mylist.L))
// decode the logs
for index, l := range mylist.L {
loglist[index] = DecodeLog(l)
}
sort.Sort(loglist)
var templist trib.List
//get the real list
for _, log := range loglist {
if log.Op == "append" {
templist.L = append(templist.L, log.Val)
} else { // remove?
newList := trib.List{[]string{}}
for _, entry := range templist.L {
if log.Val != entry {
newList.L = append(newList.L, entry)
}
}
templist.L = newList.L
/*i := 0
for _, l := range templist.L{
if l == log.Val {
if i < len(templist.L) {
templist.L = append(templist.L[:i], templist.L[i+1:]...)
} else {
templist.L = templist.L[:i]
}
} else {
i++
}
}*/
}
}
*list = templist
return nil
}