feat: initial release

internal/web/client/client.go

@@ -0,0 +1,108 @@
+package client
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"time"
+
+	"git.wzray.com/homelab/mastermind/internal/types"
+	"git.wzray.com/homelab/mastermind/internal/web/middleware"
+)
+
+type client struct {
+	http       *http.Client
+	middleware middleware.Middleware
+}
+
+var defaultClient *client
+const timeout = time.Duration(2) * time.Second
+
+func (c *client) makeRequest(method string, host string, path types.Path, data any, out any) error {
+	var body io.Reader
+	if data != nil {
+		raw, err := json.Marshal(data)
+		if err != nil {
+			return fmt.Errorf("marshal body: %w", err)
+		}
+		body = bytes.NewReader(raw)
+	}
+
+	uri := (&url.URL{
+		Scheme: "http",
+		Host:   host,
+		Path:   path.String(),
+	}).String()
+
+	r, err := http.NewRequest(method, uri, body)
+	if err != nil {
+		return fmt.Errorf("build http request: %w", err)
+	}
+
+	if body != nil {
+		r.Header.Set("Content-Type", "application/json; charset=utf-8")
+	}
+
+	if err := c.middleware.Client(r); err != nil {
+		return fmt.Errorf("apply middleware: %w", err)
+	}
+
+	resp, err := c.http.Do(r)
+	if err != nil {
+		return fmt.Errorf("send request: %w", err)
+	}
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		b, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("http %d: %s", resp.StatusCode, string(b))
+	}
+
+	defer resp.Body.Close()
+	if out != nil {
+		if err := json.NewDecoder(resp.Body).Decode(out); err != nil {
+			return fmt.Errorf("decode body: %w", err)
+		}
+	}
+
+	io.Copy(io.Discard, resp.Body)
+	return nil
+}
+
+func Init(mw middleware.Middleware) {
+	if defaultClient != nil {
+		panic("web.client: Init called twice")
+	}
+
+	defaultClient = &client{
+		http:       &http.Client{
+			Timeout: timeout,
+		},
+		middleware: mw,
+	}
+}
+
+func request[Out any, In any](method string, host string, path types.Path, data In) (*Out, error) {
+	out := &types.Response[Out]{}
+	err := defaultClient.makeRequest(method, host, path, data, out)
+	if err != nil {
+		return nil, err
+	}
+
+	if !out.Ok {
+		return nil, errors.New(out.Err)
+	}
+
+	return &out.Data, err
+}
+
+func Get[Out any](host string, path types.Path) (*Out, error) { // TODO: out should not be a pointer
+	return request[Out, any](http.MethodGet, host, path, nil)
+}
+
+func Post[Out any, In any](host string, path types.Path, data In) (*Out, error) {
+	return request[Out](http.MethodPost, host, path, data)
+}