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package main
import (
"encoding/json"
"fmt"
"net/http"
"os"
"strings"
)
func main() {
db := getInitializedDatabase()
http.HandleFunc("/zip/", func(w http.ResponseWriter, r *http.Request) {
handleZipcodeRequest(w, r, db)
})
http.ListenAndServe(getListeningAddress(), nil)
}
func getInitializedDatabase() *ZipcodeDatabase {
db := NewZipcodeDatabase()
err := db.LoadFromCSV("./zips.csv")
if err != nil {
fmt.Printf("%s\n", err)
}
return db
}
func getListeningAddress() string {
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
return strings.Join([]string{
":",
port,
}, "")
}
func handleZipcodeRequest(response http.ResponseWriter, request *http.Request, db *ZipcodeDatabase) {
zip := zipcodeForRequest(request)
if details := db.Find(zip); details == nil {
http.Error(response, "", 404)
} else {
setResponseHeaders(response)
sendZipcodeDetails(details, response)
}
}
func setResponseHeaders(response http.ResponseWriter) {
response.Header().Set("Access-Control-Allow-Origin", "*")
response.Header().Set("Content-Type", "application/json")
}
func zipcodeForRequest(request *http.Request) string {
return request.URL.Path[len("/zip/"):]
}
func sendZipcodeDetails(details *ZipcodeDetails, response http.ResponseWriter) {
data, _ := json.MarshalIndent(details, "", " ")
fmt.Fprintf(response, string(data))
}
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