fix(retry): retry transient edge answers centrally, fix stale task test (#57)

- Route HTTP helpers (getJSON/formRequest/deleteReq/postJSON/putJSON/
  multipart upload), Query and AuthenticateContext/ensureToken through the
  deterministic 429/502/503/504 retry (retryRaw), so the integration suite
  no longer fails on the shared openresty rate limit under parallel runs.
- Fix stale cmd/office/fetch integration test: loader.TaskFields was
  replaced by loader.DetailForm (broke go vet -tags=integration).
- Add unit tests for Transient/DoRetry.

AGENTS.md

@@ -9,7 +9,7 @@ Canonical Go client for OnlyOffice Workspace (Projects + Calendar + CRM) and the
   - `request.go` — `Request`, `Query`, `Time`, `Token`, `MetaResponse`, `Permissions`.
   - `auth.go` — `Authenticate`, `AuthenticateContext`, `InvalidateToken`, `Auth`, token lifecycle.
   - `http.go` — transport + DRY response decoders (`ResponseArray`/`ResponseObject`/`postFormObject`/`putFormObject`/`deleteObject`).
-  - `projects.go`, `tasks.go`, `users.go`, `calendar.go`, `crm.go`, `files.go`, `files_webdav.go`, `files_stem.go`, `retry.go`, `mails.go`, `invoices.go` — typed / untyped domain methods. **`files.go`** — CRM opportunity upload plus **project/task Documents** (`UpdateFile`, `UploadToFolderReplacing`). **`files_webdav.go`** — Documents module by id (`ListDavFolder`, `MoveDavItems`/`CopyDavItems` with per-operation error surfacing, `ListFileOps`). **`retry.go`** — `DoRetry`: deterministic linear backoff (no jitter) on 429/502/503/504; every bulk tool routes API calls through it. **`mails.go`** — OnlyOffice Workspace Mail. **`invoices.go`** — CRM invoices, PDF regen/cleanup, status. Association rules: [`docs/crm-associations.md`](docs/crm-associations.md).
+  - `projects.go`, `tasks.go`, `users.go`, `calendar.go`, `crm.go`, `files.go`, `files_webdav.go`, `files_stem.go`, `retry.go`, `mails.go`, `invoices.go` — typed / untyped domain methods. **`files.go`** — CRM opportunity upload plus **project/task Documents** (`UpdateFile`, `UploadToFolderReplacing`). **`files_webdav.go`** — Documents module by id (`ListDavFolder`, `MoveDavItems`/`CopyDavItems` with per-operation error surfacing, `ListFileOps`). **`retry.go`** — `DoRetry`: deterministic linear backoff (no jitter) on 429/502/503/504; every bulk tool routes API calls through it, and the HTTP transport + auth (`retryRaw`, `AuthenticateContext`) retry transient answers centrally. **`mails.go`** — OnlyOffice Workspace Mail. **`invoices.go`** — CRM invoices, PDF regen/cleanup, status. Association rules: [`docs/crm-associations.md`](docs/crm-associations.md).
   - **Unified file client (epic #34) — `file_core.go`, `file_rest.go`, `file_dav.go`, `file_pg.go`, `file_es.go`, `file_es_text.go`, `file_text_index.go`, `file_facade.go`.** `file_core.go` — model (`Entry`, `Kind`) + `FileStore`/`Searcher`; `file_rest.go`/`file_dav.go` — REST/WebDAV adapters; `file_pg.go` — **read-only** SQL store (PostgreSQL/MySQL, `ErrReadOnly` on writes); `file_es.go` — OnlyOffice Elasticsearch searcher; `file_es_text.go`/`file_text_index.go` — own PDF/scan index (`oo_docs_text`, PDF attachments via pdfdetach); `file_facade.go` — `FileClient` with read/write/search order and transient fallback. Use `c.Files()` (facade), `c.FileStore("rest"|"dav"|"pg"|"sql")` or `c.SQLFileStore()`; contract and how to add a backend: [`docs/unified-file-client.md`](docs/unified-file-client.md).
   - Pure stdlib + `google/go-querystring`; no UI, no dotenv.
 - **CLI — `cmd/oo/` as `package main`.** Cobra wrapper that loads `.env` via `godotenv` at startup. **Subject-based command tree** mirroring [`tea`](https://gitea.com/gitea/tea):

auth.go

@@ -43,6 +43,11 @@ func (c *Client) Authenticate() error { return c.ensureToken() }
 // cached token is still valid it returns immediately; otherwise it performs
 // a POST to /api/2.0/authentication.json that is cancellable via ctx.
 //
+// Transient answers from the edge (openresty 429/502/503/504) are retried with
+// the same deterministic policy as every other request (see retry.go), because
+// the server rate-limits authentication and the integration suite otherwise
+// fails with a raw HTML 429 page.
+//
 // This is the recommended entry point for long-running syncs (cron,
 // watchers) because it guarantees that a stalled auth call will not block
 // the caller past its deadline.
@@ -50,6 +55,14 @@ func (c *Client) AuthenticateContext(ctx context.Context) error {
 	if c.tokenValid() {
 		return nil
 	}
+	return DoRetry(ctx, DefaultRetryPolicy(), func() error {
+		return c.authenticateOnce(ctx)
+	})
+}
+
+// authenticateOnce performs a single authentication POST. Callers must handle
+// retries; use AuthenticateContext.
+func (c *Client) authenticateOnce(ctx context.Context) error {
 	body, err := json.Marshal(c.credentials)
 	if err != nil {
 		return fmt.Errorf("marshal credentials: %w", err)
@@ -99,17 +112,13 @@ func (c *Client) tokenValid() bool {
 
 // ensureToken refreshes the authentication token when missing or expired.
 // Mirrors the logic inline in Query() but is safe to call from helpers that
-// bypass the typed Request abstraction.
+// bypass the typed Request abstraction. It shares AuthenticateContext so the
+// transient-retry policy applies to every code path.
 func (c *Client) ensureToken() error {
 	if c.tokenValid() {
 		return nil
 	}
-	tok, err := c.Auth(c.credentials)
-	if err != nil {
-		return err
-	}
-	c.token = tok
-	return nil
+	return c.AuthenticateContext(context.Background())
 }
 
 // authHeader returns the value for the Authorization header, ensuring a token.

cmd/office/fetch/task_integration_test.go

@@ -4,7 +4,6 @@ package fetch_test
 
 import (
 	"context"
-	"os"
 	"testing"
 
 	"github.com/eslider/go-onlyoffice/cmd/office/model"
@@ -46,9 +45,6 @@ func TestIntegrationUpdateTaskTitleDescription(t *testing.T) {
 }
 
 func TestIntegrationTaskFieldsFromLiveAPI(t *testing.T) {
-	if os.Getenv("ONLYOFFICE_URL") == "" && os.Getenv("ONLYOFFICE_HOST") == "" {
-		t.Skip("ONLYOFFICE_URL not set")
-	}
 	loader, ctx := liveLoader(t)
 	items, err := loader.List(ctx, model.ListSpec{Subject: model.SubjectTasks})
 	if err != nil {
@@ -57,12 +53,12 @@ func TestIntegrationTaskFieldsFromLiveAPI(t *testing.T) {
 	if len(items) == 0 {
 		t.Skip("no tasks")
 	}
-	title, desc, err := loader.TaskFields(ctx, items[0])
+	fields, err := loader.DetailForm(ctx, items[0])
 	if err != nil {
 		t.Fatal(err)
 	}
-	if title == "" {
+	if fields.Primary == "" {
 		t.Fatal("empty title")
 	}
-	_ = desc
+	_ = fields.Secondary
 }

http.go

@@ -144,8 +144,13 @@ func unmarshalResponseObject(raw json.RawMessage) (map[string]any, error) {
 	}
 }
 
-// getJSON issues an authenticated GET and returns the raw response body.
+// getJSON issues an authenticated GET and returns the raw response body,
+// retrying transient answers (see retryRaw).
 func (c *Client) getJSON(ctx context.Context, path string) (json.RawMessage, error) {
+	return retryRaw(ctx, func() (json.RawMessage, error) { return c.getJSONOnce(ctx, path) })
+}
+
+func (c *Client) getJSONOnce(ctx context.Context, path string) (json.RawMessage, error) {
 	auth, err := c.authHeader()
 	if err != nil {
 		return nil, err
@@ -187,6 +192,12 @@ func (c *Client) deleteForm(ctx context.Context, path string, fields url.Values)
 }
 
 func (c *Client) formRequest(ctx context.Context, method, path string, fields url.Values) (json.RawMessage, error) {
+	return retryRaw(ctx, func() (json.RawMessage, error) {
+		return c.formRequestOnce(ctx, method, path, fields)
+	})
+}
+
+func (c *Client) formRequestOnce(ctx context.Context, method, path string, fields url.Values) (json.RawMessage, error) {
 	auth, err := c.authHeader()
 	if err != nil {
 		return nil, err
@@ -215,6 +226,10 @@ func (c *Client) formRequest(ctx context.Context, method, path string, fields ur
 
 // deleteReq issues an authenticated DELETE.
 func (c *Client) deleteReq(ctx context.Context, path string) (json.RawMessage, error) {
+	return retryRaw(ctx, func() (json.RawMessage, error) { return c.deleteReqOnce(ctx, path) })
+}
+
+func (c *Client) deleteReqOnce(ctx context.Context, path string) (json.RawMessage, error) {
 	auth, err := c.authHeader()
 	if err != nil {
 		return nil, err
@@ -260,6 +275,10 @@ func (c *Client) postJSONObject(ctx context.Context, path string, body any) (map
 
 // postJSON issues an authenticated POST with application/json body.
 func (c *Client) postJSON(ctx context.Context, path string, body any) (json.RawMessage, error) {
+	return retryRaw(ctx, func() (json.RawMessage, error) { return c.postJSONOnce(ctx, path, body) })
+}
+
+func (c *Client) postJSONOnce(ctx context.Context, path string, body any) (json.RawMessage, error) {
 	auth, err := c.authHeader()
 	if err != nil {
 		return nil, err
@@ -303,6 +322,10 @@ func (c *Client) postJSON(ctx context.Context, path string, body any) (json.RawM
 
 // putJSON issues an authenticated PUT with application/json body.
 func (c *Client) putJSON(ctx context.Context, path string, body any) (json.RawMessage, error) {
+	return retryRaw(ctx, func() (json.RawMessage, error) { return c.putJSONOnce(ctx, path, body) })
+}
+
+func (c *Client) putJSONOnce(ctx context.Context, path string, body any) (json.RawMessage, error) {
 	auth, err := c.authHeader()
 	if err != nil {
 		return nil, err
@@ -352,8 +375,15 @@ func (c *Client) uploadMultipart(ctx context.Context, path, fieldName, filePath
 // uploadMultipartMethod sends a single-file multipart request with the given
 // HTTP method. The OnlyOffice Documents API needs PUT for /update (a new
 // version) and POST for /upload (a new file); sending POST to /update answers
-// 500 on current servers.
+// 500 on current servers. The file is re-opened per attempt, so transient
+// answers are retried like every other request.
 func (c *Client) uploadMultipartMethod(ctx context.Context, method, path, fieldName, filePath string) (json.RawMessage, error) {
+	return retryRaw(ctx, func() (json.RawMessage, error) {
+		return c.uploadMultipartOnce(ctx, method, path, fieldName, filePath)
+	})
+}
+
+func (c *Client) uploadMultipartOnce(ctx context.Context, method, path, fieldName, filePath string) (json.RawMessage, error) {
 	auth, err := c.authHeader()
 	if err != nil {
 		return nil, err

request.go

@@ -8,6 +8,7 @@ package onlyoffice
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -49,6 +50,12 @@ func (r Request) GetMethod() string {
 //   - If request.NoAuth is true then no token is fetched — the caller is
 //     responsible for authenticating requests (used internally by Auth()).
 func (c *Client) Query(request Request, result interface{}) error {
+	return DoRetry(context.Background(), DefaultRetryPolicy(), func() error {
+		return c.queryOnce(request, result)
+	})
+}
+
+func (c *Client) queryOnce(request Request, result interface{}) error {
 	url := c.credentials.Url + request.Uri
 
 	if request.Params != nil {
@@ -90,10 +97,17 @@ func (c *Client) Query(request Request, result interface{}) error {
 	}
 	defer resp.Body.Close()
 
+	raw, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+	if resp.StatusCode >= 400 {
+		return fmt.Errorf("%s %s: %d %s", request.GetMethod(), request.Uri, resp.StatusCode, truncate(string(raw), 400))
+	}
 	if result == nil {
 		return nil
 	}
-	return json.NewDecoder(resp.Body).Decode(result)
+	return json.Unmarshal(raw, result)
 }
 
 // requestBodyReader normalises Query() body input into an io.Reader.

retry.go

@@ -2,6 +2,7 @@ package onlyoffice
 
 import (
 	"context"
+	"encoding/json"
 	"regexp"
 	"time"
 )
@@ -58,3 +59,16 @@ func DoRetry(ctx context.Context, p RetryPolicy, fn func() error) error {
 	}
 	return err
 }
+
+// retryRaw runs a transport attempt under the default transient-retry policy
+// and returns its raw payload. All HTTP helpers and Query() go through it, so
+// an openresty 429/502/503/504 is retried exactly like every bulk tool.
+func retryRaw(ctx context.Context, fn func() (json.RawMessage, error)) (json.RawMessage, error) {
+	var raw json.RawMessage
+	err := DoRetry(ctx, DefaultRetryPolicy(), func() error {
+		var e error
+		raw, e = fn()
+		return e
+	})
+	return raw, err
+}

retry_test.go

@@ -0,0 +1,88 @@
+package onlyoffice
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestTransient(t *testing.T) {
+	cases := []struct {
+		err  error
+		want bool
+	}{
+		{nil, false},
+		{errors.New("boom"), false},
+		{errors.New("GET /api/2.0/files/1.json: 429 Too Many Requests"), true},
+		{errors.New("auth: 502 bad gateway"), true},
+		{errors.New("POST /x: 503 service unavailable"), true},
+		{errors.New("PUT /x: 504 gateway timeout"), true},
+		{errors.New("GET /x: 404 not found"), false},
+		{errors.New("GET /x: 4290 not a code"), false},
+	}
+	for _, c := range cases {
+		if got := Transient(c.err); got != c.want {
+			t.Errorf("Transient(%v) = %v, want %v", c.err, got, c.want)
+		}
+	}
+}
+
+func TestDoRetryRetriesTransientThenSucceeds(t *testing.T) {
+	p := RetryPolicy{Attempts: 5, Base: time.Millisecond, Max: 5 * time.Millisecond}
+	attempts := 0
+	err := DoRetry(context.Background(), p, func() error {
+		attempts++
+		if attempts < 3 {
+			return errors.New("GET /x: 429 Too Many Requests")
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatalf("DoRetry: %v", err)
+	}
+	if attempts != 3 {
+		t.Fatalf("attempts = %d, want 3", attempts)
+	}
+}
+
+func TestDoRetryStopsOnPermanentError(t *testing.T) {
+	p := RetryPolicy{Attempts: 5, Base: time.Millisecond, Max: time.Millisecond}
+	attempts := 0
+	err := DoRetry(context.Background(), p, func() error {
+		attempts++
+		return errors.New("GET /x: 404 not found")
+	})
+	if err == nil {
+		t.Fatal("want error")
+	}
+	if attempts != 1 {
+		t.Fatalf("attempts = %d, want 1", attempts)
+	}
+}
+
+func TestDoRetryExhaustsAttemptsOnPersistentTransient(t *testing.T) {
+	p := RetryPolicy{Attempts: 3, Base: time.Millisecond, Max: time.Millisecond}
+	attempts := 0
+	err := DoRetry(context.Background(), p, func() error {
+		attempts++
+		return errors.New("GET /x: 429 Too Many Requests")
+	})
+	if !Transient(err) {
+		t.Fatalf("want transient error, got %v", err)
+	}
+	if attempts != 3 {
+		t.Fatalf("attempts = %d, want 3", attempts)
+	}
+}
+
+func TestDoRetryHonoursContextCancellation(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	err := DoRetry(ctx, RetryPolicy{Attempts: 3, Base: time.Millisecond, Max: time.Millisecond}, func() error {
+		return errors.New("GET /x: 429 Too Many Requests")
+	})
+	if !errors.Is(err, context.Canceled) {
+		t.Fatalf("want context.Canceled, got %v", err)
+	}
+}