benvin
e0f54ef320
Add `tomswall agent`: it pulls this device's compiled config from tomswallapi, differentially applies it, and reports the applied generation. It caches the last known-good config and, when the control plane is unreachable, keeps applying that cache — it never fails closed. - internal/agent: rendered-config types, HTTP client (fetch + status report), on-disk cache, on-device DNS resolver for dns sets (honors the device's configured resolver, fail-safe on lookup failure), and the pull-apply-report loop behind a mockable Applier. - Translate the interface-agnostic, address-matched rendered model into native tomswall config using the "all:<cidr>" any-interface source/dest form, reusing the existing differential engine. Named-set members are inlined as concrete addresses (native nft set references are a tracked follow-up). - cmd/tomswall: wire the `agent` subcommand (flags + TOMSWALL_* env, --once). - Unit tests: translation, cache, and the don't-fail-closed fallback loop. - Add DESIGN.md documenting the control-plane architecture.
95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package agent
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"time"
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"gopkg.in/yaml.v3"
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)
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// Client talks to the tomswallapi control plane for one device.
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type Client struct {
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BaseURL string
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Device string
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Token string
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HTTP *http.Client
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}
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// NewClient builds a Client with a sane default timeout.
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func NewClient(baseURL, device, token string) *Client {
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return &Client{
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BaseURL: baseURL,
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Device: device,
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Token: token,
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HTTP: &http.Client{Timeout: 30 * time.Second},
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}
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}
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// FetchConfig retrieves the device's rendered config. It returns both the parsed
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// document and the raw bytes (so callers can cache exactly what was served).
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func (c *Client) FetchConfig(ctx context.Context) (*RenderedConfig, []byte, error) {
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url := fmt.Sprintf("%s/api/v1/devices/%s/config", c.BaseURL, c.Device)
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return nil, nil, err
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}
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req.Header.Set("Authorization", "Bearer "+c.Token)
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req.Header.Set("Accept", "application/yaml")
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resp, err := c.HTTP.Do(req)
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if err != nil {
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return nil, nil, err
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}
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defer resp.Body.Close()
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, nil, err
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}
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if resp.StatusCode != http.StatusOK {
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return nil, nil, fmt.Errorf("fetch config: status %d: %s", resp.StatusCode, bytes.TrimSpace(body))
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}
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cfg, err := ParseRendered(body)
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if err != nil {
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return nil, nil, err
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}
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return cfg, body, nil
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}
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// ParseRendered decodes a rendered config document (YAML, JSON is a subset).
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func ParseRendered(body []byte) (*RenderedConfig, error) {
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var cfg RenderedConfig
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if err := yaml.Unmarshal(body, &cfg); err != nil {
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return nil, fmt.Errorf("parsing rendered config: %w", err)
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}
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return &cfg, nil
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}
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// ReportStatus tells the control plane which generation this device has applied.
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func (c *Client) ReportStatus(ctx context.Context, generation int64) error {
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url := fmt.Sprintf("%s/api/v1/devices/%s/status", c.BaseURL, c.Device)
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payload, _ := json.Marshal(map[string]int64{"generation": generation})
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(payload))
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if err != nil {
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return err
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}
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req.Header.Set("Authorization", "Bearer "+c.Token)
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req.Header.Set("Content-Type", "application/json")
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resp, err := c.HTTP.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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io.Copy(io.Discard, io.LimitReader(resp.Body, 1<<16))
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if resp.StatusCode >= 400 {
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return fmt.Errorf("report status: %d", resp.StatusCode)
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}
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return nil
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}
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