46 lines
865 B
Go
46 lines
865 B
Go
package main
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import (
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"encoding/json"
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"log"
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"math/big"
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"net"
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"protohackers/pkg/conn"
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)
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var (
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malformedResponse = []byte("malformed\n")
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trueResponse = []byte(`{"method":"isPrime","prime":true}` + "\n")
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falseResponse = []byte(`{"method":"isPrime","prime":false}` + "\n")
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)
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type data struct {
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Method string `json:"method"`
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Number *float64 `json:"number"`
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}
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func main() {
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err := conn.StartSimpleTCP(primetime)
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if err != nil {
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log.Fatalln(err)
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}
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}
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func primetime(c net.Conn) {
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if err := conn.ReadAndRespond(c, process); err != nil {
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log.Fatalln(err)
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}
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}
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func process(buf []byte) []byte {
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var in data
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err := json.Unmarshal(buf, &in)
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if err != nil || in.Method != "isPrime" || in.Number == nil {
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return malformedResponse
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} else if big.NewInt(int64(*in.Number)).ProbablyPrime(0) {
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return trueResponse
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}
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return falseResponse
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}
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