File size: 9,486 Bytes
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S3-triggered Lambda: start a one-shot ECS Fargate task for doc_redaction direct mode.
Upload a job ``.env`` under ENV_PREFIX on the output bucket; the Lambda merges optional
default params, sets RUN_DIRECT_MODE=True, and calls ecs.run_task with container overrides.
"""
import os
import urllib.parse
import boto3
ecs = boto3.client("ecs")
s3 = boto3.client("s3")
OUTPUT_BUCKET = os.environ.get("OUTPUT_BUCKET", "")
CONFIG_BUCKET = os.environ.get("CONFIG_BUCKET", "")
INPUT_PREFIX = os.environ.get("INPUT_PREFIX", "input/")
CONFIG_PREFIX = os.environ.get("CONFIG_PREFIX", "")
ENV_PREFIX = os.environ.get("ENV_PREFIX", f"{INPUT_PREFIX}config/")
ENV_SUFFIX = os.environ.get("ENV_SUFFIX", ".env")
DEFAULT_PARAMS_KEY = os.environ.get("DEFAULT_PARAMS_KEY", "").strip()
CLUSTER = os.environ.get("ECS_CLUSTER", "")
TASK_DEF = os.environ.get("ECS_TASK_DEF", "")
SUBNETS = [s.strip() for s in os.environ.get("SUBNETS", "").split(",") if s.strip()]
SECURITY_GROUPS = [
s.strip() for s in os.environ.get("SECURITY_GROUPS", "").split(",") if s.strip()
]
CONTAINER_NAME = os.environ.get("CONTAINER_NAME", "")
DEFAULT_DIRECT_MODE_TASK = os.environ.get("DEFAULT_DIRECT_MODE_TASK", "redact")
ASSIGN_PUBLIC_IP = os.environ.get("ECS_ASSIGN_PUBLIC_IP", "false").lower() == "true"
APP_CONFIG_ENV_KEY = os.environ.get("APP_CONFIG_ENV_KEY", "app_config.env").strip()
_DEFAULT_INPUT_KEYS = ("DIRECT_MODE_INPUT_FILE",)
_DEFAULT_CONFIG_KEYS = (
"DENY_LIST_PATH",
"ALLOW_LIST_PATH",
"WHOLE_PAGE_REDACTION_LIST_PATH",
"DENY_LIST_FILE",
"ALLOW_LIST_FILE",
"REDACT_WHOLE_PAGE_FILE",
)
S3_PREFIX_INPUT_KEYS = tuple(
k.strip()
for k in os.environ.get(
"S3_PREFIX_INPUT_KEYS", ",".join(_DEFAULT_INPUT_KEYS)
).split(",")
if k.strip()
)
S3_PREFIX_CONFIG_KEYS = tuple(
k.strip()
for k in os.environ.get(
"S3_PREFIX_CONFIG_KEYS", ",".join(_DEFAULT_CONFIG_KEYS)
).split(",")
if k.strip()
)
_TASK_HINTS = (
("combine_review", "combine_review_pdfs"),
("deduplicate", "deduplicate"),
("summarise", "summarise"),
("summarize", "summarise"),
("textract", "textract"),
("redact", "redact"),
)
def _key_matches(key: str) -> bool:
return key.startswith(ENV_PREFIX) and key.endswith(ENV_SUFFIX)
def _s3_uri(bucket: str, prefix: str, relative_path: str) -> str:
rel = relative_path.lstrip("/")
base = prefix or ""
if base and not base.endswith("/"):
base += "/"
return f"s3://{bucket}/{base}{rel}"
def _maybe_prefix_value(key: str, value: str, input_base: str, config_base: str) -> str:
if not value:
return value
if value.strip().upper().startswith("S3://"):
return value
if key in S3_PREFIX_INPUT_KEYS:
if "," in value:
parts = [p.strip() for p in value.split(",") if p.strip()]
return ",".join(
_maybe_prefix_value(key, p, input_base, config_base) for p in parts
)
return input_base + value.lstrip("/")
if key in S3_PREFIX_CONFIG_KEYS:
return config_base + value.lstrip("/")
return value
def _parse_dotenv(
dotenv_bytes: bytes,
output_bucket: str,
input_prefix: str,
config_bucket: str,
config_prefix: str,
) -> dict:
"""Parse a basic .env and apply S3 URI prefixes to configured keys."""
env = {}
text = dotenv_bytes.decode("utf-8", errors="replace")
for raw_line in text.splitlines():
line = raw_line.strip()
if not line or line.startswith("#"):
continue
if line.startswith("export "):
line = line[len("export ") :].strip()
if "=" not in line:
continue
key, value = line.split("=", 1)
key = key.strip()
value = value.strip()
if (value.startswith('"') and value.endswith('"')) or (
value.startswith("'") and value.endswith("'")
):
value = value[1:-1]
env[key] = value
input_base = f"s3://{output_bucket}/{input_prefix}"
config_base = f"s3://{config_bucket}/{config_prefix}"
for key in list(env.keys()):
env[key] = _maybe_prefix_value(key, env[key], input_base, config_base)
return env
def _derive_task_from_key(key: str) -> str | None:
"""Optional: infer DIRECT_MODE_TASK from job filename."""
basename = key.split("/")[-1].lower()
for hint, task in _TASK_HINTS:
if hint in basename:
return task
return None
def _build_environment_array(*env_dicts):
"""Merge dictionaries left→right; later dicts win."""
merged = {}
for d in env_dicts:
if d:
merged.update(d)
return [{"name": k, "value": str(v)} for k, v in merged.items()]
def _load_app_config_env() -> dict:
"""Base app_config.env from the config/logs bucket (replaces ECS environmentFiles)."""
if not APP_CONFIG_ENV_KEY:
return {}
bucket = CONFIG_BUCKET
if not bucket:
return {}
try:
obj = s3.get_object(Bucket=bucket, Key=APP_CONFIG_ENV_KEY)
except s3.exceptions.ClientError as e:
code = e.response.get("Error", {}).get("Code", "")
if code in ("NoSuchKey", "404"):
print(f"app_config env not found at s3://{bucket}/{APP_CONFIG_ENV_KEY}")
return {}
raise
return _parse_dotenv(
obj["Body"].read(),
bucket,
INPUT_PREFIX,
bucket,
CONFIG_PREFIX,
)
def _load_default_env(output_bucket: str) -> dict:
if not DEFAULT_PARAMS_KEY:
return {}
bucket = OUTPUT_BUCKET or output_bucket
if not bucket:
return {}
try:
obj = s3.get_object(Bucket=bucket, Key=DEFAULT_PARAMS_KEY)
except s3.exceptions.ClientError as e:
code = e.response.get("Error", {}).get("Code", "")
if code in ("NoSuchKey", "404"):
print(f"Default params not found at s3://{bucket}/{DEFAULT_PARAMS_KEY}")
return {}
raise
return _parse_dotenv(
obj["Body"].read(),
bucket,
INPUT_PREFIX,
CONFIG_BUCKET or bucket,
CONFIG_PREFIX,
)
def _required_runtime_env(merged: dict) -> dict:
"""Always-on overrides; do not clobber job-specific DIRECT_MODE_TASK."""
runtime = {"RUN_DIRECT_MODE": "True"}
if "DIRECT_MODE_TASK" not in merged:
runtime["DIRECT_MODE_TASK"] = DEFAULT_DIRECT_MODE_TASK
if CONFIG_BUCKET:
runtime["DOCUMENT_REDACTION_BUCKET"] = CONFIG_BUCKET
elif OUTPUT_BUCKET:
runtime["DOCUMENT_REDACTION_BUCKET"] = OUTPUT_BUCKET
return runtime
def lambda_handler(event, context):
runs = []
default_file_env = {}
app_config_env = _load_app_config_env()
if DEFAULT_PARAMS_KEY:
try:
default_file_env = _load_default_env(
event.get("Records", [{}])[0]
.get("s3", {})
.get("bucket", {})
.get("name", OUTPUT_BUCKET)
)
except Exception as exc:
print(f"Could not load default params: {exc}")
for record in event.get("Records", []):
s3rec = record.get("s3", {})
bucket = s3rec.get("bucket", {}).get("name")
raw_key = s3rec.get("object", {}).get("key")
if not bucket or not raw_key:
print("Missing bucket or key in S3 event record, skipping.")
continue
key = urllib.parse.unquote_plus(raw_key)
if not _key_matches(key):
print(f"Key does not match filter: {key}, skipping.")
continue
obj = s3.get_object(Bucket=bucket, Key=key)
file_env = _parse_dotenv(
obj["Body"].read(),
bucket,
INPUT_PREFIX,
CONFIG_BUCKET or bucket,
CONFIG_PREFIX,
)
derived = {}
if "DIRECT_MODE_TASK" not in file_env:
hinted = _derive_task_from_key(key)
if hinted:
derived["DIRECT_MODE_TASK"] = hinted
merged_for_required = {}
for d in (app_config_env, default_file_env, derived, file_env):
if d:
merged_for_required.update(d)
environment = _build_environment_array(
app_config_env,
default_file_env,
derived,
file_env,
_required_runtime_env(merged_for_required),
)
print(
f"Starting batch task for s3://{bucket}/{key} ({len(environment)} env vars)"
)
response = ecs.run_task(
cluster=CLUSTER,
launchType="FARGATE",
taskDefinition=TASK_DEF,
networkConfiguration={
"awsvpcConfiguration": {
"subnets": SUBNETS,
"securityGroups": SECURITY_GROUPS,
"assignPublicIp": "ENABLED" if ASSIGN_PUBLIC_IP else "DISABLED",
}
},
overrides={
"containerOverrides": [
{
"name": CONTAINER_NAME,
"environment": environment,
}
]
},
)
runs.append(
{
"bucket": bucket,
"key": key,
"taskArns": [t["taskArn"] for t in response.get("tasks", [])],
"failures": response.get("failures", []),
"envCount": len(environment),
}
)
return {"runs": runs}
|