feat: Environment Configuration and Logging Baseline

.env.example

@@ -2,10 +2,10 @@
 
 MASTODON_BASE_URL=https://mastodon.example
 MASTODON_ACCESS_TOKEN=replace-me
-MASTODON_VISIBILITY=public
+VISIBILITY=public
 SITE_URL=https://blog.example.com
 HASHTAGS=#throwback,#10backward
-THROWBACK_PREFIX=Throwback:
+THROWNBACK_PREFIX=Throwback:
-RETRY_COUNT=3
+MAX_RETRIES=3
 RUN_AT=09:00
 TZ=Europe/Berlin

build.sh

@@ -2,6 +2,13 @@
 set -euo pipefail
 export DEBIAN_FRONTEND=noninteractive
 
+SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+cd "${SCRIPT_DIR}"
+
+if [ -w /usr/local/bin ] && [ ! -e /usr/local/bin/build.sh ]; then
+    ln -s "${SCRIPT_DIR}/build.sh" /usr/local/bin/build.sh || true
+fi
+
 apt-get update
 apt-get install -y --no-install-recommends \
     bash \

docker-compose.yml

@@ -11,11 +11,11 @@ services:
     environment:
       MASTODON_BASE_URL: ${MASTODON_BASE_URL:-https://mastodon.example}
       MASTODON_ACCESS_TOKEN: ${MASTODON_ACCESS_TOKEN:-replace-me}
-      MASTODON_VISIBILITY: ${MASTODON_VISIBILITY:-public}
+      VISIBILITY: ${VISIBILITY:-public}
       SITE_URL: ${SITE_URL:-https://blog.example.com}
       HASHTAGS: ${HASHTAGS:-#throwback,#10backward}
-      THROWBACK_PREFIX: ${THROWBACK_PREFIX:-Throwback:}
+      THROWNBACK_PREFIX: ${THROWNBACK_PREFIX:-Throwback:}
-      RETRY_COUNT: ${RETRY_COUNT:-3}
+      MAX_RETRIES: ${MAX_RETRIES:-3}
       RUN_AT: ${RUN_AT:-09:00}
       TZ: ${TZ:-Europe/Berlin}
     volumes:

entrypoint.sh

@@ -11,9 +11,13 @@ fi
 required_vars=(
     MASTODON_BASE_URL
     MASTODON_ACCESS_TOKEN
+    VISIBILITY
     SITE_URL
     HASHTAGS
+    THROWNBACK_PREFIX
+    MAX_RETRIES
     RUN_AT
+    TZ
 )
 
 missing=()

src/tenbackward/config.py

@@ -4,6 +4,8 @@ import os
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Optional
+from urllib.parse import urlparse
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from dotenv import dotenv_values, load_dotenv
 
@@ -11,27 +13,29 @@ from dotenv import dotenv_values, load_dotenv
 REQUIRED_KEYS = (
     "MASTODON_BASE_URL",
     "MASTODON_ACCESS_TOKEN",
+    "VISIBILITY",
     "SITE_URL",
     "HASHTAGS",
+    "THROWNBACK_PREFIX",
+    "MAX_RETRIES",
     "RUN_AT",
-)
-
-OPTIONAL_KEYS = (
-    "MASTODON_VISIBILITY",
-    "THROWBACK_PREFIX",
-    "RETRY_COUNT",
     "TZ",
 )
 
+OPTIONAL_KEYS: tuple[str, ...] = ()
+
 DEFAULTS = {
-    "MASTODON_VISIBILITY": "public",
+    "VISIBILITY": "public",
-    "THROWBACK_PREFIX": "Throwback:",
+    "THROWNBACK_PREFIX": "Throwback:",
-    "RETRY_COUNT": "3",
+    "MAX_RETRIES": "3",
     "TZ": "Europe/Berlin",
     "RUN_AT": "09:00",
 }
 
 
+ALLOWED_VISIBILITY = frozenset({"public", "unlisted"})
+
+
 class ConfigError(ValueError):
     """Raised when required configuration is missing or invalid."""
 
@@ -40,11 +44,11 @@ class ConfigError(ValueError):
 class Config:
     mastodon_base_url: str
     mastodon_access_token: str
-    mastodon_visibility: str
+    visibility: str
     site_url: str
     hashtags: str
     throwback_prefix: str
-    retry_count: int
+    max_retries: int
     run_at: str
     tz: str
     data_dir: Path = field(default_factory=lambda: Path("/app/data"))
@@ -104,11 +108,11 @@ def load_config(dotenv_path: Optional[Path] = None) -> Config:
     return Config(
         mastodon_base_url=merged["MASTODON_BASE_URL"],
         mastodon_access_token=merged["MASTODON_ACCESS_TOKEN"],
-        mastodon_visibility=merged["MASTODON_VISIBILITY"],
+        visibility=merged["VISIBILITY"],
         site_url=merged["SITE_URL"],
         hashtags=merged["HASHTAGS"],
-        throwback_prefix=merged["THROWBACK_PREFIX"],
+        throwback_prefix=merged["THROWNBACK_PREFIX"],
-        retry_count=_parse_retry_count(merged["RETRY_COUNT"]),
+        max_retries=_parse_max_retries(merged["MAX_RETRIES"]),
         run_at=merged["RUN_AT"],
         tz=merged["TZ"],
         data_dir=data_dir,
@@ -122,25 +126,47 @@ def apply_defaults(values: dict[str, str]) -> None:
 
 
 def validate_config(values: dict[str, str]) -> None:
-    missing = [k for k in REQUIRED_KEYS if not values.get(k)]
+    errors: list[str] = []
-    if missing:
+
-        raise ConfigError(
+    for key in REQUIRED_KEYS:
-            "missing required configuration key(s): " + ", ".join(missing)
+        raw = values.get(key, "")
-        )
+        if not raw:
+            errors.append(f"missing required configuration key: {key}")
 
     run_at = values.get("RUN_AT", "")
-    if not _is_valid_hhmm(run_at):
+    if run_at and not _is_valid_hhmm(run_at):
-        raise ConfigError(
+        errors.append(f"RUN_AT={run_at!r} must be in HH:MM (24-hour) format")
-            f"RUN_AT={run_at!r} must be in HH:MM (24-hour) format"
+
+    base_url = values.get("MASTODON_BASE_URL", "")
+    if base_url and not _is_valid_url(base_url):
+        errors.append(f"MASTODON_BASE_URL={base_url!r} must be a valid http(s) URL")
+
+    site_url = values.get("SITE_URL", "")
+    if site_url and not _is_valid_url(site_url):
+        errors.append(f"SITE_URL={site_url!r} must be a valid http(s) URL")
+
+    visibility = values.get("VISIBILITY", "")
+    if visibility and not _is_valid_visibility(visibility):
+        errors.append(
+            f"VISIBILITY={visibility!r} must be one of: {sorted(ALLOWED_VISIBILITY)}"
         )
 
-    try:
+    tz = values.get("TZ", "")
-        _parse_retry_count(values.get("RETRY_COUNT", ""))
+    if tz and not _is_valid_tz(tz):
-    except ConfigError as exc:
+        errors.append(f"TZ={tz!r} must be a valid IANA timezone")
-        raise ConfigError(str(exc)) from exc
+
+    max_retries = values.get("MAX_RETRIES", "")
+    if max_retries:
+        try:
+            _parse_max_retries(max_retries)
+        except ConfigError as exc:
+            errors.append(str(exc))
+
+    if errors:
+        raise ConfigError("; ".join(errors))
 
 
-def _is_valid_hhmm(value: str) -> bool:
+def _is_valid_hhmm(value) -> bool:
     if not isinstance(value, str):
         return False
     parts = value.split(":")
@@ -156,11 +182,39 @@ def _is_valid_hhmm(value: str) -> bool:
     return 0 <= h <= 23 and 0 <= m <= 59
 
 
-def _parse_retry_count(value: str) -> int:
+def _is_valid_url(value: str) -> bool:
+    if not isinstance(value, str) or not value:
+        return False
+    try:
+        parsed = urlparse(value)
+    except (TypeError, ValueError):
+        return False
+    return parsed.scheme in {"http", "https"} and bool(parsed.netloc)
+
+
+def _is_valid_visibility(value: str) -> bool:
+    return isinstance(value, str) and value in ALLOWED_VISIBILITY
+
+
+def _is_valid_tz(value: str) -> bool:
+    if not isinstance(value, str) or not value:
+        return False
+    try:
+        ZoneInfo(value)
+    except ZoneInfoNotFoundError:
+        return False
+    except Exception:
+        return False
+    return True
+
+
+def _parse_max_retries(value) -> int:
+    if isinstance(value, bool):
+        raise ConfigError(f"MAX_RETRIES={value!r} must be a non-negative integer")
     try:
         count = int(value)
     except (TypeError, ValueError):
-        raise ConfigError(f"RETRY_COUNT={value!r} must be a positive integer")
+        raise ConfigError(f"MAX_RETRIES={value!r} must be a non-negative integer")
     if count < 0:
-        raise ConfigError(f"RETRY_COUNT={value!r} must be >= 0")
+        raise ConfigError(f"MAX_RETRIES={value!r} must be >= 0")
     return count

src/tenbackward/logging_setup.py

@@ -0,0 +1,155 @@
+from __future__ import annotations
+
+import json
+import logging
+from datetime import datetime, timezone
+from typing import Any
+
+from .config import ConfigError
+
+_SECRET_KEYS = frozenset(
+    {
+        "token",
+        "access_token",
+        "mastodon_access_token",
+        "password",
+        "secret",
+        "authorization",
+        "api_key",
+    }
+)
+
+_LOGGER_NAME = "tenbackward"
+
+
+class JsonFormatter(logging.Formatter):
+    """Emit one JSON object per log record.
+
+    Reserved record attributes are mapped to top-level keys; anything passed
+    via ``extra=`` is merged into the same object. Keys whose name appears in
+    ``_SECRET_KEYS`` are redacted before formatting.
+    """
+
+    _RESERVED = {
+        "name",
+        "msg",
+        "args",
+        "levelname",
+        "levelno",
+        "pathname",
+        "filename",
+        "module",
+        "exc_info",
+        "exc_text",
+        "stack_info",
+        "lineno",
+        "funcName",
+        "created",
+        "msecs",
+        "relativeCreated",
+        "thread",
+        "threadName",
+        "processName",
+        "process",
+        "message",
+        "asctime",
+    }
+
+    def format(self, record: logging.LogRecord) -> str:  # noqa: A003
+        message = record.getMessage()
+        payload: dict[str, Any] = {
+            "ts": datetime.fromtimestamp(record.created, tz=timezone.utc).isoformat(),
+            "level": record.levelname,
+            "logger": record.name,
+            "message": message,
+        }
+
+        for key, value in record.__dict__.items():
+            if key in self._RESERVED or key.startswith("_"):
+                continue
+            if key in _SECRET_KEYS:
+                payload[key] = "[REDACTED]"
+            else:
+                payload[key] = value
+
+        if record.exc_info:
+            payload["exc_type"] = record.exc_info[0].__name__ if record.exc_info[0] else None
+
+        return json.dumps(payload, default=str, sort_keys=False)
+
+
+def configure_json_logging(level: int = logging.INFO) -> None:
+    """Install the JSON formatter on the root logger.
+
+    Idempotent: safe to call multiple times (replaces any existing handler).
+    """
+    handler = logging.StreamHandler()
+    handler.setFormatter(JsonFormatter())
+    handler.setLevel(level)
+
+    root = logging.getLogger()
+    root.setLevel(level)
+    for existing in list(root.handlers):
+        root.removeHandler(existing)
+    root.addHandler(handler)
+
+
+def _redact_dict(fields: dict[str, Any]) -> dict[str, Any]:
+    cleaned: dict[str, Any] = {}
+    for key, value in fields.items():
+        if key.lower() in _SECRET_KEYS:
+            cleaned[key] = "[REDACTED]"
+        else:
+            cleaned[key] = value
+    return cleaned
+
+
+def log_run_summary(
+    scanned: int,
+    matched: int,
+    posted: int,
+    skipped: int,
+    posted_ids: list[str],
+) -> None:
+    """Emit a single structured info line on successful completion.
+
+    A run with no matching posts is silent — no log line is emitted.
+    """
+    if scanned == 0 and matched == 0 and posted == 0 and skipped == 0 and not posted_ids:
+        return
+
+    fields = _redact_dict(
+        {
+            "event": "run_complete",
+            "scanned": scanned,
+            "matched": matched,
+            "posted": posted,
+            "skipped": skipped,
+            "posted_ids": list(posted_ids),
+        }
+    )
+    logging.getLogger(_LOGGER_NAME).info("run complete", extra=fields)
+
+
+def log_error(event: str, *, exc: BaseException | None = None, **fields: Any) -> None:
+    """Emit a single structured error line, redacting any secret-shaped keys."""
+    payload = _redact_dict({"event": event, **fields})
+    if exc is not None:
+        payload["exc_type"] = type(exc).__name__
+    logging.getLogger(_LOGGER_NAME).error(event, extra=payload)
+
+
+def log_startup(**fields: Any) -> None:
+    """Emit a single structured info line at startup."""
+    payload = _redact_dict({"event": "startup", **fields})
+    logging.getLogger(_LOGGER_NAME).info("startup", extra=payload)
+
+
+__all__ = [
+    "ConfigError",
+    "JsonFormatter",
+    "configure_json_logging",
+    "log_error",
+    "log_run_summary",
+    "log_startup",
+]

src/tenbackward/main.py

@@ -1,47 +1,116 @@
 from __future__ import annotations
 
-import logging
 import sys
+import time
+from typing import Iterable
 
 from . import __version__
-from .config import ConfigError, load_config
+from .config import Config, ConfigError, load_config
+from .logging_setup import (
+    configure_json_logging,
+    log_error,
+    log_run_summary,
+    log_startup,
+)
 from .state import load_posted, save_posted
 
 
-log = logging.getLogger("tenbackward")
+def _iter_candidates(config: Config) -> Iterable[str]:
+    """Yield candidate post identifiers.
+
+    This is the extension seam for the future blog-clone + matching
+    pipeline. Job 1083 leaves it empty so the silent-on-no-matches
+    contract is the default behaviour.
+    """
+    return []
+
+
+def _run_once(config: Config) -> tuple[int, int, int, int, list[str]]:
+    """Execute one pipeline pass and return the summary counters.
+
+    Returns ``(scanned, matched, posted, skipped, posted_ids)``.
+    """
+    already_posted = set(load_posted(config.data_dir).keys())
+
+    scanned = 0
+    matched = 0
+    posted = 0
+    skipped = 0
+    posted_ids: list[str] = []
+
+    state = load_posted(config.data_dir)
+
+    for candidate_id in _iter_candidates(config):
+        scanned += 1
+        matched += 1
+        if candidate_id in already_posted:
+            skipped += 1
+            continue
+        posted_ids.append(candidate_id)
+        state[candidate_id] = {"posted_at": _now_iso()}
+        posted += 1
+
+    if posted_ids:
+        save_posted(config.data_dir, state)
+
+    return scanned, matched, posted, skipped, posted_ids
+
+
+def _now_iso() -> str:
+    from datetime import datetime, timezone
+
+    return datetime.now(tz=timezone.utc).isoformat()
+
+
+def _run_with_retry(config: Config) -> tuple[int, int, int, int, list[str]] | None:
+    """Execute the pipeline with retries. Returns the summary counters on
+    success or ``None`` when the retry budget is exhausted."""
+    attempts = max(1, config.max_retries + 1)
+    last_exc: BaseException | None = None
+    for attempt in range(1, attempts + 1):
+        try:
+            return _run_once(config)
+        except Exception as exc:  # noqa: BLE001 — broad on purpose
+            last_exc = exc
+            log_error(
+                "pipeline_error",
+                exc=exc,
+                attempt=attempt,
+                max_attempts=attempts,
+            )
+            if attempt < attempts:
+                time.sleep(0)
+    assert last_exc is not None
+    log_error("pipeline_failed", exc=last_exc, attempts=attempts)
+    return None
 
 
 def main() -> int:
-    logging.basicConfig(
+    configure_json_logging()
-        level=logging.INFO,
-        format="%(asctime)s %(levelname)s %(name)s: %(message)s",
-    )
 
     try:
         config = load_config()
     except ConfigError as exc:
-        log.error("configuration error: %s", exc)
+        log_error("configuration_error", exc=exc)
         return 2
 
     config.data_dir.mkdir(parents=True, exist_ok=True)
 
-    state = load_posted(config.data_dir)
+    log_startup(
-    save_posted(config.data_dir, state)
+        version=__version__,
-
+        site_url=config.site_url,
-    log.info(
+        run_at=config.run_at,
-        "10backward v%s ready (site=%s, run_at=%s, tz=%s, hashtags=%s, prefix=%r)",
+        tz=config.tz,
-        __version__,
+        hashtags=config.hashtags,
-        config.site_url,
+        throwback_prefix=config.throwback_prefix,
-        config.run_at,
-        config.tz,
-        config.hashtags,
-        config.throwback_prefix,
     )
 
-    log.warning(
+    result = _run_with_retry(config)
-        "post pipeline is not yet implemented; this run only validates the scaffold. "
+    if result is None:
-        "Future job will clone the blog and post a throwback via Mastodon.py."
+        return 1
-    )
+
+    scanned, matched, posted, skipped, posted_ids = result
+    log_run_summary(scanned, matched, posted, skipped, posted_ids)
     return 0
 
 

tests/conftest.py

@@ -16,9 +16,13 @@ def env_setup(monkeypatch: pytest.MonkeyPatch) -> None:
     """
     monkeypatch.setenv("MASTODON_BASE_URL", "https://mastodon.example")
     monkeypatch.setenv("MASTODON_ACCESS_TOKEN", "test-token")
+    monkeypatch.setenv("VISIBILITY", "public")
     monkeypatch.setenv("SITE_URL", "https://blog.example.com")
     monkeypatch.setenv("HASHTAGS", "#throwback,#10backward")
+    monkeypatch.setenv("THROWNBACK_PREFIX", "Throwback:")
+    monkeypatch.setenv("MAX_RETRIES", "3")
     monkeypatch.setenv("RUN_AT", "09:00")
+    monkeypatch.setenv("TZ", "Europe/Berlin")
 
 
 @pytest.fixture()

tests/test_config.py

@@ -9,15 +9,30 @@ from tenbackward.config import ConfigError, load_config, validate_config
 
 
 def _populate(env_setup) -> dict[str, str]:
-    return {k: os.environ[k] for k in os.environ if k.startswith(("MASTODON_", "SITE_", "HASHTAGS", "RUN_AT", "THROWBACK_", "RETRY_", "TZ"))}
+    return {k: os.environ[k] for k in os.environ if k.startswith(("MASTODON_", "VISIBILITY", "SITE_", "HASHTAGS", "THROWNBACK_", "MAX_RETRIES", "RUN_AT", "TZ"))}
+
+
+def _full_values() -> dict[str, str]:
+    return {
+        "MASTODON_BASE_URL": "https://mastodon.example",
+        "MASTODON_ACCESS_TOKEN": "x",
+        "VISIBILITY": "public",
+        "SITE_URL": "https://blog.example.com",
+        "HASHTAGS": "#throwback",
+        "THROWNBACK_PREFIX": "Throwback:",
+        "MAX_RETRIES": "3",
+        "RUN_AT": "09:00",
+        "TZ": "Europe/Berlin",
+    }
 
 
 def test_load_config_succeeds_with_complete_env(env_setup) -> None:
     config = load_config()
     assert config.mastodon_base_url == "https://mastodon.example"
     assert config.run_at == "09:00"
-    assert config.retry_count == 3
+    assert config.max_retries == 3
     assert config.throwback_prefix == "Throwback:"
+    assert config.visibility == "public"
 
 
 def test_validate_config_lists_every_missing_key(env_setup, monkeypatch) -> None:
@@ -27,9 +42,13 @@ def test_validate_config_lists_every_missing_key(env_setup, monkeypatch) -> None
     values = {k: os.environ.get(k, "") for k in [
         "MASTODON_BASE_URL",
         "MASTODON_ACCESS_TOKEN",
+        "VISIBILITY",
         "SITE_URL",
         "HASHTAGS",
+        "THROWNBACK_PREFIX",
+        "MAX_RETRIES",
         "RUN_AT",
+        "TZ",
     ]}
 
     with pytest.raises(ConfigError) as excinfo:
@@ -41,30 +60,63 @@ def test_validate_config_lists_every_missing_key(env_setup, monkeypatch) -> None
 
 
 def test_validate_config_rejects_bad_run_at() -> None:
-    values = {
+    values = _full_values()
-        "MASTODON_BASE_URL": "https://mastodon.example",
+    values["RUN_AT"] = "25:99"
-        "MASTODON_ACCESS_TOKEN": "x",
-        "SITE_URL": "https://blog.example.com",
-        "HASHTAGS": "#x",
-        "RUN_AT": "25:99",
-        "MASTODON_VISIBILITY": "public",
-        "THROWBACK_PREFIX": "Throwback:",
-        "RETRY_COUNT": "3",
-        "TZ": "Europe/Berlin",
-    }
     with pytest.raises(ConfigError):
         validate_config(values)
 
 
+def test_validate_config_rejects_invalid_url() -> None:
+    values = _full_values()
+    values["SITE_URL"] = "not-a-url"
+    with pytest.raises(ConfigError, match="SITE_URL"):
+        validate_config(values)
+
+    values = _full_values()
+    values["MASTODON_BASE_URL"] = "ftp://mastodon.example"
+    with pytest.raises(ConfigError, match="MASTODON_BASE_URL"):
+        validate_config(values)
+
+
+def test_validate_config_rejects_invalid_visibility() -> None:
+    for bad in ("private", "direct", "", "PUBLIC"):
+        values = _full_values()
+        values["VISIBILITY"] = bad
+        with pytest.raises(ConfigError, match="VISIBILITY"):
+            validate_config(values)
+
+
+def test_validate_config_rejects_invalid_tz() -> None:
+    values = _full_values()
+    values["TZ"] = "Not/AZone"
+    with pytest.raises(ConfigError, match="TZ"):
+        validate_config(values)
+
+
+def test_validate_config_rejects_negative_max_retries() -> None:
+    values = _full_values()
+    values["MAX_RETRIES"] = "-1"
+    with pytest.raises(ConfigError, match="MAX_RETRIES"):
+        validate_config(values)
+
+
+def test_validate_config_accepts_zero_max_retries() -> None:
+    values = _full_values()
+    values["MAX_RETRIES"] = "0"
+    validate_config(values)
+
+
 def test_load_config_applies_optional_defaults(env_setup, monkeypatch) -> None:
-    monkeypatch.delenv("THROWBACK_PREFIX", raising=False)
+    monkeypatch.delenv("VISIBILITY", raising=False)
-    monkeypatch.delenv("RETRY_COUNT", raising=False)
+    monkeypatch.delenv("THROWNBACK_PREFIX", raising=False)
+    monkeypatch.delenv("MAX_RETRIES", raising=False)
+    monkeypatch.delenv("TZ", raising=False)
 
     config = load_config()
     assert config.throwback_prefix == "Throwback:"
-    assert config.retry_count == 3
+    assert config.max_retries == 3
     assert config.tz == "Europe/Berlin"
-    assert config.mastodon_visibility == "public"
+    assert config.visibility == "public"
 
 
 def test_load_config_reads_dotenv_file(tmp_path: Path, monkeypatch) -> None:
@@ -72,18 +124,35 @@ def test_load_config_reads_dotenv_file(tmp_path: Path, monkeypatch) -> None:
     dotenv.write_text(
         "MASTODON_BASE_URL=https://from-file.example\n"
         "MASTODON_ACCESS_TOKEN=file-token\n"
+        "VISIBILITY=unlisted\n"
         "SITE_URL=https://blog.example.com\n"
         "HASHTAGS=#throwback\n"
+        "THROWNBACK_PREFIX=Werferückblick:\n"
+        "MAX_RETRIES=5\n"
         "RUN_AT=12:34\n"
+        "TZ=Europe/Berlin\n"
     )
 
-    for key in ("MASTODON_BASE_URL", "MASTODON_ACCESS_TOKEN", "SITE_URL", "HASHTAGS", "RUN_AT"):
+    for key in (
+        "MASTODON_BASE_URL",
+        "MASTODON_ACCESS_TOKEN",
+        "VISIBILITY",
+        "SITE_URL",
+        "HASHTAGS",
+        "THROWNBACK_PREFIX",
+        "MAX_RETRIES",
+        "RUN_AT",
+        "TZ",
+    ):
         monkeypatch.delenv(key, raising=False)
 
     config = load_config(dotenv_path=dotenv)
     assert config.mastodon_base_url == "https://from-file.example"
     assert config.mastodon_access_token == "file-token"
     assert config.run_at == "12:34"
+    assert config.visibility == "unlisted"
+    assert config.throwback_prefix == "Werferückblick:"
+    assert config.max_retries == 5
 
 
 def test_env_overrides_dotenv(tmp_path: Path, monkeypatch) -> None:
@@ -94,10 +163,19 @@ def test_env_overrides_dotenv(tmp_path: Path, monkeypatch) -> None:
     for key in (
         "MASTODON_BASE_URL",
         "MASTODON_ACCESS_TOKEN",
+        "VISIBILITY",
         "SITE_URL",
         "HASHTAGS",
+        "THROWNBACK_PREFIX",
+        "MAX_RETRIES",
+        "TZ",
     ):
         monkeypatch.setenv(key, "x")
+    monkeypatch.setenv("MASTODON_BASE_URL", "https://mastodon.example")
+    monkeypatch.setenv("SITE_URL", "https://blog.example.com")
+    monkeypatch.setenv("VISIBILITY", "public")
+    monkeypatch.setenv("TZ", "Europe/Berlin")
+    monkeypatch.setenv("MAX_RETRIES", "3")
 
     config = load_config(dotenv_path=dotenv)
     assert config.run_at == "23:00"

tests/test_cron_render.py

@@ -103,8 +103,11 @@ def test_entrypoint_renders_run_at_into_cron() -> None:
         env = _entrypoint_env({
             "MASTODON_BASE_URL": "https://mastodon.example",
             "MASTODON_ACCESS_TOKEN": "x",
+            "VISIBILITY": "public",
             "SITE_URL": "https://blog.example.com",
             "HASHTAGS": "#throwback",
+            "THROWNBACK_PREFIX": "Throwback:",
+            "MAX_RETRIES": "3",
             "RUN_AT": "09:00",
             "TZ": "Europe/Berlin",
         })

tests/test_entrypoint_validation.py

@@ -39,8 +39,11 @@ def test_entrypoint_rejects_bad_run_at(tmp_path: Path, monkeypatch) -> None:
     env = _clean_env()
     env["MASTODON_BASE_URL"] = "https://mastodon.example"
     env["MASTODON_ACCESS_TOKEN"] = "x"
+    env["VISIBILITY"] = "public"
     env["SITE_URL"] = "https://blog.example.com"
     env["HASHTAGS"] = "#throwback"
+    env["THROWNBACK_PREFIX"] = "Throwback:"
+    env["MAX_RETRIES"] = "3"
     env["RUN_AT"] = "25:99"
     env["TZ"] = "Europe/Berlin"
 
@@ -61,8 +64,11 @@ def test_entrypoint_fails_fast_when_token_missing(tmp_path: Path, monkeypatch) -
     """A missing required var must abort before cron is started."""
     env = _clean_env()
     env["MASTODON_BASE_URL"] = "https://mastodon.example"
+    env["VISIBILITY"] = "public"
     env["SITE_URL"] = "https://blog.example.com"
     env["HASHTAGS"] = "#throwback"
+    env["THROWNBACK_PREFIX"] = "Throwback:"
+    env["MAX_RETRIES"] = "3"
     env["RUN_AT"] = "09:00"
     env["TZ"] = "Europe/Berlin"
     env.pop("MASTODON_ACCESS_TOKEN", None)

tests/test_logging_setup.py

@@ -0,0 +1,93 @@
+from __future__ import annotations
+
+import io
+import json
+import logging
+
+from tenbackward.logging_setup import (
+    JsonFormatter,
+    configure_json_logging,
+    log_error,
+    log_run_summary,
+    log_startup,
+)
+
+
+def _capture(logger: logging.Logger) -> io.StringIO:
+    buf = io.StringIO()
+    handler = logging.StreamHandler(buf)
+    handler.setFormatter(JsonFormatter())
+    logger.handlers = [handler]
+    logger.setLevel(logging.INFO)
+    logger.propagate = False
+    return buf
+
+
+def test_json_formatter_emits_valid_json() -> None:
+    buf = _capture(logging.getLogger("tenbackward.test"))
+    logging.getLogger("tenbackward.test").info("hello", extra={"foo": 1})
+    line = buf.getvalue().strip()
+    payload = json.loads(line)
+    assert payload["message"] == "hello"
+    assert payload["level"] == "INFO"
+    assert payload["logger"] == "tenbackward.test"
+    assert payload["foo"] == 1
+    assert "ts" in payload
+
+
+def test_json_formatter_redacts_secret_keys() -> None:
+    buf = _capture(logging.getLogger("tenbackward.test"))
+    logging.getLogger("tenbackward.test").info(
+        "msg",
+        extra={"access_token": "secret-value", "site_url": "https://x"},
+    )
+    payload = json.loads(buf.getvalue().strip())
+    assert payload["access_token"] == "[REDACTED]"
+    assert payload["site_url"] == "https://x"
+
+
+def test_log_run_summary_emits_one_line_with_counters() -> None:
+    buf = _capture(logging.getLogger("tenbackward"))
+    log_run_summary(3, 2, 1, 1, ["x"])
+    lines = [line for line in buf.getvalue().splitlines() if line.strip()]
+    assert len(lines) == 1
+    payload = json.loads(lines[0])
+    assert payload["message"] == "run complete"
+    assert payload["event"] == "run_complete"
+    assert payload["scanned"] == 3
+    assert payload["matched"] == 2
+    assert payload["posted"] == 1
+    assert payload["skipped"] == 1
+    assert payload["posted_ids"] == ["x"]
+
+
+def test_log_run_summary_silent_when_no_matches() -> None:
+    buf = _capture(logging.getLogger("tenbackward"))
+    log_run_summary(0, 0, 0, 0, [])
+    assert buf.getvalue() == ""
+
+
+def test_log_startup_emits_single_info_line() -> None:
+    buf = _capture(logging.getLogger("tenbackward"))
+    log_startup(version="0.1.0", site_url="https://x", run_at="09:00", tz="Europe/Berlin")
+    payload = json.loads(buf.getvalue().strip())
+    assert payload["event"] == "startup"
+    assert payload["version"] == "0.1.0"
+
+
+def test_log_error_redacts_secret_keys_and_exposes_exc_type() -> None:
+    buf = _capture(logging.getLogger("tenbackward"))
+    log_error("boom", exc=RuntimeError("x"), access_token="abc")
+    payload = json.loads(buf.getvalue().strip())
+    assert payload["level"] == "ERROR"
+    assert payload["event"] == "boom"
+    assert payload["access_token"] == "[REDACTED]"
+    assert payload["exc_type"] == "RuntimeError"
+
+
+def test_configure_json_logging_is_idempotent() -> None:
+    configure_json_logging()
+    configure_json_logging()
+    root = logging.getLogger()
+    json_handlers = [h for h in root.handlers if isinstance(h.formatter, JsonFormatter)]
+    assert len(json_handlers) == 1

tests/test_run_logging.py

@@ -0,0 +1,117 @@
+from __future__ import annotations
+
+import io
+import json
+import logging
+import os
+from pathlib import Path
+
+import pytest
+
+from tenbackward import main as main_module
+from tenbackward.logging_setup import JsonFormatter
+from tenbackward.main import main
+
+
+@pytest.fixture()
+def capture_logger() -> io.StringIO:
+    buf = io.StringIO()
+    handler = logging.StreamHandler(buf)
+    handler.setFormatter(JsonFormatter())
+    target = logging.getLogger("tenbackward")
+    target.handlers = [handler]
+    target.setLevel(logging.INFO)
+    target.propagate = False
+    return buf
+
+
+def _run_lines(buf: io.StringIO) -> list[dict]:
+    return [json.loads(line) for line in buf.getvalue().splitlines() if line.strip()]
+
+
+def _seed_state(data_dir: Path, ids: list[str]) -> None:
+    from tenbackward.state import save_posted
+
+    state = {pid: {"posted_at": "2024-01-01T00:00:00+00:00"} for pid in ids}
+    save_posted(data_dir, state)
+
+
+def test_run_emits_one_info_summary_on_success(env_setup, data_dir, capture_logger, monkeypatch) -> None:
+    monkeypatch.setenv("DATA_DIR", str(data_dir))
+
+    monkeypatch.setattr(main_module, "_iter_candidates", lambda config: ["new-1", "already-1"])
+
+    _seed_state(data_dir, ["already-1"])
+
+    rc = main()
+    assert rc == 0
+
+    lines = _run_lines(capture_logger)
+    summary = [line for line in lines if line.get("event") == "run_complete"]
+    assert len(summary) == 1
+    payload = summary[0]
+    assert payload["scanned"] == 2
+    assert payload["matched"] == 2
+    assert payload["posted"] == 1
+    assert payload["skipped"] == 1
+    assert payload["posted_ids"] == ["new-1"]
+
+    from tenbackward.state import load_posted
+
+    state = load_posted(data_dir)
+    assert "new-1" in state
+    assert "already-1" in state
+
+
+def test_run_silent_when_no_matches(env_setup, data_dir, capture_logger, monkeypatch) -> None:
+    monkeypatch.setenv("DATA_DIR", str(data_dir))
+    monkeypatch.setattr(main_module, "_iter_candidates", lambda config: [])
+
+    rc = main()
+    assert rc == 0
+
+    lines = _run_lines(capture_logger)
+    summary = [line for line in lines if line.get("event") == "run_complete"]
+    assert summary == []
+
+
+def test_run_returns_nonzero_on_pipeline_error(env_setup, data_dir, capture_logger, monkeypatch) -> None:
+    monkeypatch.setenv("DATA_DIR", str(data_dir))
+    monkeypatch.setenv("MAX_RETRIES", "1")
+
+    def _boom(config):
+        raise RuntimeError("boom-token-should-not-appear")
+
+    monkeypatch.setattr(main_module, "_iter_candidates", _boom)
+
+    rc = main()
+    assert rc == 1
+
+    lines = _run_lines(capture_logger)
+    summary = [line for line in lines if line.get("event") == "run_complete"]
+    assert summary == []
+
+    error_lines = [line for line in lines if line.get("level") == "ERROR"]
+    assert any("exc_type" in line for line in error_lines)
+    assert "boom-token-should-not-appear" not in capture_logger.getvalue()
+
+
+def test_run_distinguishes_posted_from_skipped_via_ids(env_setup, data_dir, capture_logger, monkeypatch) -> None:
+    monkeypatch.setenv("DATA_DIR", str(data_dir))
+    monkeypatch.setattr(
+        main_module,
+        "_iter_candidates",
+        lambda config: ["alpha", "beta", "gamma"],
+    )
+    _seed_state(data_dir, ["beta"])
+
+    rc = main()
+    assert rc == 0
+
+    summary = [line for line in _run_lines(capture_logger) if line.get("event") == "run_complete"]
+    assert len(summary) == 1
+    payload = summary[0]
+    assert set(payload["posted_ids"]) == {"alpha", "gamma"}
+    assert "beta" not in payload["posted_ids"]
+    assert payload["skipped"] == 1
+    assert payload["posted"] == 2