51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package funker
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import (
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"encoding/json"
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"io/ioutil"
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"net"
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"time"
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)
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// Call a Funker function
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func Call(name string, args interface{}) (interface{}, error) {
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argsJSON, err := json.Marshal(args)
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if err != nil {
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return nil, err
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}
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addr, err := net.ResolveTCPAddr("tcp", name+":9999")
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if err != nil {
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return nil, err
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}
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conn, err := net.DialTCP("tcp", nil, addr)
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if err != nil {
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return nil, err
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}
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// Keepalive is a workaround for docker/docker#29655 .
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// The implementation of FIN_WAIT2 seems weird on Swarm-mode.
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// It seems always refuseing any packet after 60 seconds.
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//
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// TODO: remove this workaround if the issue gets resolved on the Docker side
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if err := conn.SetKeepAlive(true); err != nil {
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return nil, err
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}
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if err := conn.SetKeepAlivePeriod(30 * time.Second); err != nil {
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return nil, err
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}
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if _, err = conn.Write(argsJSON); err != nil {
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return nil, err
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}
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if err = conn.CloseWrite(); err != nil {
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return nil, err
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}
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retJSON, err := ioutil.ReadAll(conn)
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if err != nil {
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return nil, err
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}
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var ret interface{}
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err = json.Unmarshal(retJSON, &ret)
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return ret, err
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}
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