// New creates a new Telegraph instance
func New(userHash string, hostnames []string, checkInterval time.Duration,
maxConnectionCount int, keyPair cryptochain.KeyPair, debug bool) (Telegraph, error) {
cc := cryptochain.NewCryptoChain(userHash, keyPair)
// Protocol input will be used to process Newton protocol messages.
pi := make(chan store.ProtocolInput)
// Dispatcher routes messages and runs appropriate functions to process messages correctly.
dp, err := dispatcher.New(userHash, hostnames, checkInterval, maxConnectionCount, cc, pi, debug)
if err != nil {
return nil, err
}
l := logger.New("telegraph")
// Get a message store
ms := store.NewMessageStore(1000 * time.Millisecond)
t := &telegraph{
dispatcher: dp,
pool: dp.GetPool(),
log: l,
protocolOutput: make(chan ProtocolMessage, 100),
protocolInput: pi,
messageStore: ms,
cryptoChain: cc,
waitGroup: &sync.WaitGroup{},
done: make(chan struct{}),
}
t.waitGroup.Add(3)
go t.processCryptoOutput()
go t.processProtocolOutput()
go t.processProtocolInput()
return t, nil
}
func NewMessageStore(checkInterval time.Duration) MessageStore {
m := make(map[int]chan ProtocolInput)
pq := &PriorityQueue{}
heap.Init(pq)
l := logger.New("message-store")
ms := messageStore{
m: m,
checkInterval: checkInterval,
done: make(chan struct{}),
pq: pq,
log: l,
}
go ms.expireObsoleteMessages()
return &ms
}
// New returns a new Dispatcher instade
func New(userHash string, hostnames []string, checkInterval time.Duration, maxConnectionCount int,
cc *cryptochain.CryptoChain, protocolInput chan store.ProtocolInput, debug bool) (Dispatcher, error) {
p, err := pool.New(userHash, hostnames, checkInterval, maxConnectionCount, cc.ConnectionStore, debug)
if err != nil {
return nil, err
}
// Create a new logger
l := logger.New("dispatcher")
//if debug {
// logger.SetLogLevel(log.DEBUG)
//}
d := &dispatcher{
Pool: p,
log: l,
cryptoChain: cc,
protocolInput: protocolInput,
}
go d.dispatchIncomingMessages()
return d, nil
}
// New returns a new Pool instance.
func New(userHash string, hostnames []string, checkInterval time.Duration, maxConnectionCount int,
cs *cryptochain.ConnectionStore, debug bool) (Pool, error) {
hc := len(hostnames)
if hc == 0 {
return nil, errors.New("We need hosts to run.")
}
hs := &hosts{
h: map[string]struct{}{},
}
for _, host := range hostnames {
hs.h[host] = struct{}{}
}
cn := &connections{
c: make(map[string]*connection),
}
// Create a new logger
l := logger.New("pool")
if debug {
logger.SetLogLevel(log.DEBUG)
}
p := &pool{
maxConnectionCount: maxConnectionCount,
checkInterval: checkInterval,
hosts: hs,
connections: cn,
incomingMessages: make(chan []byte, 100),
log: l,
userHash: userHash,
done: make(chan struct{}),
cs: cs,
}
// Here we select hosts randomly to connect.
// We must use unique hosts
u := make(map[int]struct{})
// Determine the host limit
limit := 0
if hc < maxConnectionCount {
limit = hc
} else {
limit = maxConnectionCount
}
// Select the hosts
c := 0
for {
if len(hostnames) == 0 {
return nil, ErrNoAvailableHost
}
r := rand.Intn(hc)
if _, ok := u[r]; !ok {
host := hostnames[r]
// start a new newton connection
// if it fails, the system tries to keep the number
// at a constant value after initialization.
err := p.newConnection(host)
if err != nil {
p.log.Error("Connection failed. Skipping:", err)
hostnames = append(hostnames[:r], hostnames[r+1:]...)
continue
}
u[r] = struct{}{}
c++
if c >= limit {
break
}
}
}
// Check existing connections periodically and keep the number at maximum
go p.checkConnections()
return p, nil
}