feat: add remote NodeService client backed by the HTTP API

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

service/api_client.go

@@ -0,0 +1,122 @@
+package service
+
+import (
+	"axolotl/models"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+)
+
+type apiClient struct {
+	base string
+	user string
+	http *http.Client
+}
+
+func (c *apiClient) User() string { return c.user }
+
+func (c *apiClient) do(method, path string, body any) (*http.Response, error) {
+	var buf bytes.Buffer
+	if body != nil {
+		if err := json.NewEncoder(&buf).Encode(body); err != nil {
+			return nil, err
+		}
+	}
+	req, err := http.NewRequest(method, c.base+path, &buf)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("X-Ax-User", c.user)
+	if body != nil {
+		req.Header.Set("Content-Type", "application/json")
+	}
+	return c.http.Do(req)
+}
+
+func apiDecode[T any](resp *http.Response) (T, error) {
+	var v T
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		var e struct{ Error string }
+		json.NewDecoder(resp.Body).Decode(&e)
+		return v, fmt.Errorf("%s", e.Error)
+	}
+	return v, json.NewDecoder(resp.Body).Decode(&v)
+}
+
+func (c *apiClient) GetByID(id string) (*models.Node, error) {
+	resp, err := c.do("GET", "/nodes/"+id, nil)
+	if err != nil {
+		return nil, err
+	}
+	return apiDecode[*models.Node](resp)
+}
+
+func (c *apiClient) List(filter ListFilter) ([]*models.Node, error) {
+	q := url.Values{}
+	for _, r := range filter.Rels {
+		if r.Target == "" {
+			q.Add("rel", string(r.Type))
+		} else {
+			q.Add("rel", string(r.Type)+":"+r.Target)
+		}
+	}
+	path := "/nodes"
+	if len(q) > 0 {
+		path += "?" + q.Encode()
+	}
+	resp, err := c.do("GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	return apiDecode[[]*models.Node](resp)
+}
+
+func (c *apiClient) Add(input AddInput) (*models.Node, error) {
+	resp, err := c.do("POST", "/nodes", input)
+	if err != nil {
+		return nil, err
+	}
+	return apiDecode[*models.Node](resp)
+}
+
+func (c *apiClient) Update(id string, input UpdateInput) (*models.Node, error) {
+	resp, err := c.do("PATCH", "/nodes/"+id, input)
+	if err != nil {
+		return nil, err
+	}
+	return apiDecode[*models.Node](resp)
+}
+
+func (c *apiClient) Delete(id string) error {
+	resp, err := c.do("DELETE", "/nodes/"+id, nil)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode >= 400 {
+		var e struct{ Error string }
+		json.NewDecoder(resp.Body).Decode(&e)
+		return fmt.Errorf("%s", e.Error)
+	}
+	return nil
+}
+
+func (c *apiClient) ListUsers() ([]*models.Node, error) {
+	resp, err := c.do("GET", "/users", nil)
+	if err != nil {
+		return nil, err
+	}
+	return apiDecode[[]*models.Node](resp)
+}
+
+func (c *apiClient) AddUser(name string) (*models.Node, error) {
+	resp, err := c.do("POST", "/users", map[string]string{"name": name})
+	if err != nil {
+		return nil, err
+	}
+	return apiDecode[*models.Node](resp)
+}
+