Created
September 11, 2018 10:37
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/* | |
NewNode creates a new Chord node. Returns error if node already | |
exists in the chord ring | |
*/ | |
func NewNode(cnf *Config, joinNode *internal.Node) (*Node, error) { | |
if err := cnf.Validate(); err != nil { | |
return nil, err | |
} | |
node := &Node{ | |
Node: new(internal.Node), | |
shutdownCh: make(chan struct{}), | |
cnf: cnf, | |
storage: NewMapStore(cnf.Hash), | |
} | |
var nID string | |
if cnf.Id != "" { | |
nID = cnf.Id | |
} else { | |
nID = cnf.Addr | |
} | |
id, err := node.hashKey(nID) | |
if err != nil { | |
return nil, err | |
} | |
aInt := (&big.Int{}).SetBytes(id) | |
fmt.Printf("new node id %d, \n", aInt) | |
node.Node.Id = id | |
node.Node.Addr = cnf.Addr | |
// Populate finger table | |
node.fingerTable = newFingerTable(node.Node, cnf.HashSize) | |
// Start RPC server | |
transport, err := NewGrpcTransport(cnf) | |
if err != nil { | |
return nil, err | |
} | |
node.transport = transport | |
internal.RegisterChordServer(transport.server, node) | |
node.transport.Start() | |
if err := node.join(joinNode); err != nil { | |
return nil, err | |
} | |
// Peridoically stabilize the node. | |
go func() { | |
ticker := time.NewTicker(1 * time.Second) | |
for { | |
select { | |
case <-ticker.C: | |
node.stabilize() | |
case <-node.shutdownCh: | |
ticker.Stop() | |
return | |
} | |
} | |
}() | |
// Peridoically fix finger tables. | |
go func() { | |
next := 0 | |
ticker := time.NewTicker(100 * time.Millisecond) | |
for { | |
select { | |
case <-ticker.C: | |
next = node.fixFinger(next) | |
case <-node.shutdownCh: | |
ticker.Stop() | |
return | |
} | |
} | |
}() | |
// Peridoically checkes whether predecessor has failed. | |
go func() { | |
ticker := time.NewTicker(10 * time.Second) | |
for { | |
select { | |
case <-ticker.C: | |
node.checkPredecessor() | |
case <-node.shutdownCh: | |
ticker.Stop() | |
return | |
} | |
} | |
}() | |
return node, nil | |
} |
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