Implement client and server

2026-03-18 00:32:14 +00:00
parent 922b136c72
commit bc291a6941
3 changed files with 273 additions and 11 deletions
--- a/client/client.go
+++ b/client/client.go
@@ -0,0 +1,130 @@
+package client
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+)
+
+const baseURL = "http://localhost:8080"
+
+var httpClient = &http.Client{}
+
+func doRequest(method, url string, body any) []byte {
+	var reqBody io.Reader
+	if body != nil {
+		data, err := json.Marshal(body)
+		if err != nil {
+			log.Fatalf("Failed to marshal request body: %v", err)
+		}
+		reqBody = bytes.NewReader(data)
+	}
+
+	req, err := http.NewRequest(method, url, reqBody)
+	if err != nil {
+		log.Fatalf("Failed to create request: %v", err)
+	}
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		log.Fatalf("Failed to send request: %v", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalf("Failed to read response body: %v", err)
+	}
+	return respBody
+}
+
+func ListNotes() {
+	body := doRequest(http.MethodGet, baseURL+"/notes", nil)
+	var notes []struct {
+		ID         int       `json:"id"`
+		Content    string    `json:"content"`
+		LastUpdate time.Time `json:"last_update"`
+	}
+	if err := json.Unmarshal(body, &notes); err != nil {
+		log.Fatalf("Failed to parse notes: %v", err)
+	}
+	if len(notes) == 0 {
+		fmt.Println("No notes found.")
+		return
+	}
+
+	// Calculate column widths from headers and content
+	idW, updatedW, contentW := 2, 7, 7 // minimums: "ID", "Updated", "Content"
+	for _, n := range notes {
+		if w := len(fmt.Sprintf("%d", n.ID)); w > idW {
+			idW = w
+		}
+		if w := len(n.LastUpdate.Format("2006-01-02 15:04:05")); w > updatedW {
+			updatedW = w
+		}
+		if w := len(n.Content); w > contentW {
+			contentW = w
+		}
+	}
+
+	row := func(id, updated, content string) {
+		fmt.Printf("| %-*s | %-*s | %-*s |\n", idW, id, updatedW, updated, contentW, content)
+	}
+	sep := fmt.Sprintf("|-%s-|-%s-|-%s-|", strings.Repeat("-", idW), strings.Repeat("-", updatedW), strings.Repeat("-", contentW))
+
+	row("ID", "Updated", "Content")
+	fmt.Println(sep)
+	for _, n := range notes {
+		row(fmt.Sprintf("%d", n.ID), n.LastUpdate.Format("2006-01-02 15:04:05"), n.Content)
+	}
+}
+
+func CreateNote(content string) {
+	body := doRequest(http.MethodPost, baseURL+"/notes", map[string]string{"content": content})
+	var note struct {
+		ID      int    `json:"id"`
+		Content string `json:"content"`
+	}
+	if err := json.Unmarshal(body, &note); err != nil {
+		log.Fatalf("Failed to parse note: %v", err)
+	}
+	fmt.Printf("Created note #%d: %s\n", note.ID, note.Content)
+}
+
+func GetNoteByID(id int) {
+	body := doRequest(http.MethodGet, fmt.Sprintf("%s/note/%d", baseURL, id), nil)
+	var note struct {
+		ID         int       `json:"id"`
+		Content    string    `json:"content"`
+		LastUpdate time.Time `json:"last_update"`
+	}
+	if err := json.Unmarshal(body, &note); err != nil {
+		log.Fatalf("Failed to parse note: %v", err)
+	}
+	fmt.Printf("Note #%d (updated %s):\n  %s\n", note.ID, note.LastUpdate.Format("2006-01-02 15:04:05"), note.Content)
+}
+
+func UpdateNoteByID(id int, content string) {
+	body := doRequest(http.MethodPut, fmt.Sprintf("%s/note/%d", baseURL, id), map[string]string{"content": content})
+	var note struct {
+		ID      int    `json:"id"`
+		Content string `json:"content"`
+	}
+	if err := json.Unmarshal(body, &note); err != nil {
+		log.Fatalf("Failed to parse note: %v", err)
+	}
+	fmt.Printf("Updated note #%d: %s\n", note.ID, note.Content)
+}
+
+func DeleteNoteByID(id int) {
+	doRequest(http.MethodDelete, fmt.Sprintf("%s/note/%d", baseURL, id), nil)
+	fmt.Printf("Deleted note #%d\n", id)
+}