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Implementation of Go server. #1

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3 changes: 3 additions & 0 deletions go.mod
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
module implementation.go

go 1.22.3
38 changes: 38 additions & 0 deletions main.go
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package main

import (
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
)

func calculateSum(number int) int {
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@ckousik ckousik Jul 19, 2024

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This is not needed. Instead, create an endpoint which can accept an (id, SDP) pair (for now you can simulate SDP using any string), and return the SDP when it is queried.
eg.
Build two endpoints:

  1. POST / which accepts a JSON object which contains the id and an SDP string.
  2. GET /<id> which returns the SDP stored with id or 404 if not found.

sum := 0
for i := 1; i <= number; i++ {
sum += i
}
return sum
}
func hello(w http.ResponseWriter, req *http.Request) {
myURL := "https://localhost:8090/?n=10"
parsedURL, err := url.Parse(myURL)
if err != nil {
fmt.Println("Can't parse URL", err)
return
}
Comment on lines +19 to +24
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@ckousik ckousik Jul 19, 2024 •
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This will never fail. Also, this parses a constant string. You should be using the URL from the request. It should already be in a parsed state.

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@Chandanyadav2025 Chandanyadav2025 Jul 19, 2024

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How can we make the value of n in url as variable value.
and how can we also parse more than two input value in raw query ?

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@ckousik ckousik Jul 19, 2024

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Please take a look at the request type: https://pkg.go.dev/net/http#Request
The incoming request is already parsed, so you can fetch a query value from there.

Secondly, the request Body can also contain data.

parts := strings.Split(parsedURL.RawQuery, "=")
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@ckousik ckousik Jul 19, 2024

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There should be a parsed query object. You shouldn't have to split here. https://pkg.go.dev/net/url#URL.Query

n, err := strconv.Atoi(parts[1])
if err != nil {
fmt.Println("number is not found", err)
return
}
var res int = calculateSum(n)
fmt.Fprintf(w, "The sum from 1 to %d is: %d", n, res)
}

func main() {
http.HandleFunc("/", hello)
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@ckousik ckousik Jul 19, 2024

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While this works, you should really create an http.Server object.

http.ListenAndServe(":8090", nil)
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@ckousik ckousik Jul 19, 2024

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You should look into the differences of binding to a port with just ":8090" vs "localhost:8090", "127.0.0.1:8090", your local network (192.168.x.x), and "0.0.0.0:8090". It is also trivial to make the port configurable here using an environment variable.

}