9-11 tasks done

Author: gyokuro-dev

courses/golang/ex09-tcp-fibonacci/.idea/.gitignore

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+)
+
+func main() {
+	conn, err := net.Dial("tcp", "127.0.0.1:8080")
+	handleError(err)
+
+	defer conn.Close()
+
+	// var resp Response
+	scan := bufio.NewScanner(os.Stdin)
+	for scan.Scan() {
+		input, err := strconv.ParseInt(scan.Text(), 10, 64)
+		handleError(err)
+		request := RequestFib{Number: int(input)}
+
+		encoder := json.NewEncoder(conn)
+		handleError(encoder.Encode(request))
+
+		var resp ResponseFib
+		decoder := json.NewDecoder(conn)
+		handleError(decoder.Decode(&resp))
+
+		fmt.Printf("%s %d\n", resp.Time, resp.Fib)
+	}
+}

courses/golang/ex09-tcp-fibonacci/.idea/ex09-tcp-fibonacci.iml

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"math/big"
+	"time"
+)
+
+type RequestFib struct {
+	Number int
+}
+
+type ResponseFib struct {
+	Number int
+	Fib    *big.Int
+	Time   time.Duration
+}
+
+var fibCache map[int]*big.Int
+
+func fib(num int) *big.Int {
+	if num < 0 {
+		panic("num < 0")
+	}
+
+	if val, ok := fibCache[num]; ok {
+		return val
+	}
+
+	size := len(fibCache)
+	a := fibCache[size-2]
+	b := fibCache[size-1]
+
+	for i := size; i <= num; i++ {
+		a.Add(a, b)
+		fibCache[i] = a
+		a, b = b, a
+	}
+	return b
+}
+
+func handleError(err error) {
+	if err == nil {
+		return
+	}
+	fmt.Println("Error: ", err.Error())
+}

courses/golang/ex09-tcp-fibonacci/.idea/modules.xml

@@ -0,0 +1,11 @@
+module main
+
+go 1.17
+
+require github.com/stretchr/testify v1.7.0
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)

courses/golang/ex09-tcp-fibonacci/.idea/vcs.xml

@@ -0,0 +1,13 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

courses/golang/ex09-tcp-fibonacci/client.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"math/big"
+	"net"
+	"time"
+)
+
+
+
+func main() {
+	fibCache = make(map[int]*big.Int)
+	fibCache[0] = big.NewInt(0)
+	fibCache[1] = big.NewInt(1)
+
+	fmt.Println("Booting up server...")
+	const port string = "8080"
+
+	ln, err := net.Listen("tcp", ":"+port)
+	handleError(err)
+	fmt.Printf("Listening on localhost:%v\n", port)
+	conn, err := ln.Accept()
+	handleError(err)
+
+	for {
+		var request RequestFib
+		decoder := json.NewDecoder(conn)
+		handleError(decoder.Decode(&request))
+
+		start := time.Now()
+		resp := ResponseFib{
+			Number: request.Number,
+			Fib:    fib(request.Number),
+			Time:   time.Since(start),
+		}
+
+		enc := json.NewEncoder(conn)
+		handleError(enc.Encode(resp))
+	}
+}