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converter_api.py
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673 lines (564 loc) · 23.7 KB
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from fastapi import FastAPI, Form, HTTPException, Response
from typing import Optional
import typing as t
import uvicorn
import re
import os
import json
import sqlglot
import logging
from datetime import datetime
from log_collector import setup_logger, log_records
import pyarrow.parquet as pq
import pyarrow.fs as fs
from sqlglot.optimizer.qualify_columns import quote_identifiers
from sqlglot import parse_one
from guardrail.main import StorageServiceClient
from guardrail.main import extract_sql_components_per_table_with_alias, get_table_infos
from guardrail.rules_validator import validate_queries
from apis.utils.helpers import (
strip_comment,
unsupported_functionality_identifiers,
extract_functions_from_query,
categorize_functions,
add_comment_to_query,
replace_struct_in_query,
ensure_select_from_values,
extract_udfs,
load_supported_functions,
extract_db_and_Table_names,
extract_joins_from_query,
extract_cte_n_subquery_list,
normalize_unicode_spaces,
transform_table_part,
transform_catalog_schema_only,
set_cte_names_case_sensitively,
)
from formatting_utils import preserve_formatting
if t.TYPE_CHECKING:
from sqlglot._typing import E
setup_logger()
ENABLE_GUARDRAIL = os.getenv("ENABLE_GUARDRAIL", "False")
STORAGE_ENGINE_URL = os.getenv("STORAGE_ENGINE_URL", "localhost") # cops-beta1-storage-storage-blue
STORAGE_ENGINE_PORT = os.getenv("STORAGE_ENGINE_PORT", 9005)
SKIP_COMMENT = "True" # Always strip multi-line comments
storage_service_client = None
app = FastAPI()
logger = logging.getLogger(__name__)
if ENABLE_GUARDRAIL.lower() == "true":
logger.info("Storage Engine URL: ", STORAGE_ENGINE_URL)
logger.info("Storage Engine Port: ", STORAGE_ENGINE_PORT)
storage_service_client = StorageServiceClient(host=STORAGE_ENGINE_URL, port=STORAGE_ENGINE_PORT)
logger.info("Storage Service Client is created")
def escape_unicode(s: str) -> str:
"""
Turn every non-ASCII (including all Unicode spaces) into \\uXXXX,
so even “invisible” characters become visible in logs.
"""
return s.encode("unicode_escape").decode("ascii")
@app.post("/convert-query")
async def convert_query(
query: str = Form(...),
query_id: Optional[str] = Form("NO_ID_MENTIONED"),
from_sql: str = Form(...),
to_sql: Optional[str] = Form("e6"),
feature_flags: Optional[str] = Form(None),
):
timestamp = datetime.now().isoformat()
to_sql = to_sql.lower()
flags_dict = {}
if feature_flags:
try:
flags_dict = json.loads(feature_flags)
except json.JSONDecodeError as je:
return HTTPException(status_code=500, detail=str(je))
if not query or not query.strip():
logger.info(
"%s AT %s FROM %s — Empty query received, returning empty result",
query_id,
timestamp,
from_sql.upper(),
)
return {"converted_query": ""}
try:
logger.info(
"%s AT %s FROM %s — Original:\n%s",
query_id,
timestamp,
from_sql.upper(),
escape_unicode(query),
)
query = normalize_unicode_spaces(query)
logger.info(
"%s AT %s FROM %s — Normalized (escaped):\n%s",
query_id,
timestamp,
from_sql.upper(),
escape_unicode(query),
)
# Always strip comment from query, but only re-add if SKIP_COMMENT is false
if SKIP_COMMENT.lower() == "true":
query, comment = strip_comment(query)
tree = sqlglot.parse_one(query, read=from_sql, error_level=None)
if flags_dict.get("USE_TWO_PHASE_QUALIFICATION_SCHEME", False):
# Check if we should only transform catalog.schema without full transpilation
if flags_dict.get("SKIP_E6_TRANSPILATION", False):
transformed_query = transform_catalog_schema_only(query, from_sql)
# transformed_query = add_comment_to_query(transformed_query, comment)
logger.info(
"%s AT %s FROM %s — Catalog.Schema Transformed Query:\n%s",
query_id,
timestamp,
from_sql.upper(),
transformed_query,
)
return {"converted_query": transformed_query}
tree = transform_table_part(tree)
tree2 = quote_identifiers(tree, dialect=to_sql)
values_ensured_ast = ensure_select_from_values(tree2)
cte_names_equivalence_checked_ast = set_cte_names_case_sensitively(values_ensured_ast)
double_quotes_added_query = cte_names_equivalence_checked_ast.sql(
dialect=to_sql, from_dialect=from_sql, pretty=flags_dict.get("PRETTY_PRINT", True)
)
double_quotes_added_query = replace_struct_in_query(double_quotes_added_query)
# Preserve original formatting if enabled via feature flag
if flags_dict.get("PRESERVE_FORMATTING", False):
double_quotes_added_query = preserve_formatting(
query, double_quotes_added_query, from_sql, to_sql
)
# double_quotes_added_query = add_comment_to_query(double_quotes_added_query, comment)
logger.info(
"%s AT %s FROM %s — Transpiled Query:\n%s",
query_id,
timestamp,
from_sql.upper(),
double_quotes_added_query,
)
return {"converted_query": double_quotes_added_query}
except Exception as e:
logger.error(
"%s AT %s FROM %s — Error:\n%s",
query_id,
timestamp,
from_sql.upper(),
str(e),
exc_info=True,
)
raise HTTPException(status_code=500, detail=str(e))
@app.get("/health")
def health_check():
return Response(status_code=200)
@app.post("/guardrail")
async def gaurd(
query: str = Form(...),
schema: str = Form(...),
catalog: str = Form(...),
):
try:
if storage_service_client is not None:
parsed = sqlglot.parse(query, error_level=None)
queries, tables = extract_sql_components_per_table_with_alias(parsed)
# tables = client.get_table_names(catalog_name="hive", db_name="tpcds_1000")
table_map = get_table_infos(tables, storage_service_client, catalog, schema)
logger.info("table info is ", table_map)
violations_found = validate_queries(queries, table_map)
if violations_found:
return {"action": "deny", "violations": violations_found}
else:
return {"action": "allow", "violations": []}
else:
detail = (
"Storage Service Not Initialized. Guardrail service status: " + ENABLE_GUARDRAIL
)
logger.error(detail)
raise HTTPException(status_code=500, detail=detail)
except Exception as e:
logger.error(f"Error in guardrail API: {e}")
raise HTTPException(status_code=500, detail=str(e))
@app.post("/transpile-guardrail")
async def Transgaurd(
query: str = Form(...),
schema: str = Form(...),
catalog: str = Form(...),
from_sql: str = Form(...),
to_sql: Optional[str] = Form("e6"),
):
to_sql = to_sql.lower()
try:
if storage_service_client is not None:
# This is the main method will which help in transpiling to our e6data SQL dialects from other dialects
converted_query = sqlglot.transpile(query, read=from_sql, write=to_sql, identify=False)[
0
]
# This is additional steps to replace the STRUCT(STRUCT()) --> {{}}
converted_query = replace_struct_in_query(converted_query)
converted_query_ast = parse_one(converted_query, read=to_sql)
double_quotes_added_query = quote_identifiers(converted_query_ast, dialect=to_sql).sql(
dialect=to_sql
)
# ------------------------#
# GuardRail Application
parsed = sqlglot.parse(double_quotes_added_query, error_level=None)
# now lets validate the query
queries, tables = extract_sql_components_per_table_with_alias(parsed)
table_map = get_table_infos(tables, storage_service_client, catalog, schema)
violations_found = validate_queries(queries, table_map)
if violations_found:
return {"action": "deny", "violations": violations_found}
else:
return {"action": "allow", "violations": []}
else:
detail = (
"Storage Service Not Initialized. Guardrail service status: " + ENABLE_GUARDRAIL
)
raise HTTPException(status_code=500, detail=detail)
except Exception as e:
raise HTTPException(status_code=500, detail=str(e))
@app.post("/statistics")
async def stats_api(
query: str = Form(...),
query_id: Optional[str] = Form("NO_ID_MENTIONED"),
from_sql: str = Form(...),
to_sql: Optional[str] = Form("e6"),
feature_flags: Optional[str] = Form(None),
):
"""
API endpoint to extract supported and unsupported SQL functions from a query.
"""
timestamp = datetime.now().isoformat()
to_sql = to_sql.lower()
logger.info(f"{query_id} AT start time: {timestamp} FROM {from_sql.upper()}")
flags_dict = {}
if feature_flags:
try:
flags_dict = json.loads(feature_flags)
except json.JSONDecodeError as je:
return HTTPException(status_code=500, detail=str(je))
try:
supported_functions_in_e6 = load_supported_functions(to_sql)
# Functions treated as keywords (no parentheses required)
functions_as_keywords = [
"LIKE",
"ILIKE",
"RLIKE",
"AT TIME ZONE",
"||",
"DISTINCT",
"QUALIFY",
]
# Exclusion list for words that are followed by '(' but are not functions
exclusion_list = [
"AS",
"AND",
"THEN",
"OR",
"ELSE",
"WHEN",
"WHERE",
"FROM",
"JOIN",
"OVER",
"ON",
"ALL",
"NOT",
"BETWEEN",
"UNION",
"SELECT",
"BY",
"GROUP",
"EXCEPT",
"SETS",
]
# Regex patterns
function_pattern = r"\b([A-Za-z_][A-Za-z0-9_]*)\s*\("
keyword_pattern = (
r"\b(?:" + "|".join([re.escape(func) for func in functions_as_keywords]) + r")\b"
)
if not query.strip():
logger.info("Query is empty or only contains comments!")
return {
"supported_functions": [],
"unsupported_functions": [],
"udf_list": [],
"converted-query": "Query is empty or only contains comments.",
"unsupported_functions_after_transpilation": [],
"executable": "NO",
"error": True,
"log_records": log_records,
}
query, comment = strip_comment(query)
# Extract functions from the query
all_functions = extract_functions_from_query(
query, function_pattern, keyword_pattern, exclusion_list
)
supported, unsupported = categorize_functions(
all_functions, supported_functions_in_e6, functions_as_keywords
)
from_dialect_function_list = load_supported_functions(from_sql)
udf_list, unsupported = extract_udfs(unsupported, from_dialect_function_list)
# --------------------------
# HANDLING PARSING ERRORS
# --------------------------
executable = "YES"
error_flag = False
try:
# ------------------------------
# Step 1: Parse the Original Query
# ------------------------------
original_ast = parse_one(query, read=from_sql)
tables_list = extract_db_and_Table_names(original_ast)
supported, unsupported = unsupported_functionality_identifiers(
original_ast, unsupported, supported
)
values_ensured_ast = ensure_select_from_values(original_ast)
cte_names_equivalence_ast = set_cte_names_case_sensitively(values_ensured_ast)
query = cte_names_equivalence_ast.sql(from_sql)
# ------------------------------
# Step 2: Transpile the Query
# ------------------------------
tree = sqlglot.parse_one(query, read=from_sql, error_level=None)
tree2 = quote_identifiers(tree, dialect=to_sql)
double_quotes_added_query = tree2.sql(
dialect=to_sql, from_dialect=from_sql, pretty=flags_dict.get("PRETTY_PRINT", True)
)
double_quotes_added_query = replace_struct_in_query(double_quotes_added_query)
# Preserve original formatting if enabled via feature flag
if flags_dict.get("PRESERVE_FORMATTING", False):
double_quotes_added_query = preserve_formatting(
query, double_quotes_added_query, from_sql, to_sql
)
double_quotes_added_query = add_comment_to_query(double_quotes_added_query, comment)
logger.info("Got the converted query!!!!")
all_functions_converted_query = extract_functions_from_query(
double_quotes_added_query, function_pattern, keyword_pattern, exclusion_list
)
supported_functions_in_converted_query, unsupported_functions_in_converted_query = (
categorize_functions(
all_functions_converted_query, supported_functions_in_e6, functions_as_keywords
)
)
double_quote_ast = parse_one(double_quotes_added_query, read=to_sql)
supported_in_converted, unsupported_in_converted = (
unsupported_functionality_identifiers(
double_quote_ast,
unsupported_functions_in_converted_query,
supported_functions_in_converted_query,
)
)
joins_list = extract_joins_from_query(original_ast)
cte_values_subquery_list = extract_cte_n_subquery_list(original_ast)
if unsupported_in_converted:
executable = "NO"
logger.info(
f"{query_id} executed in {(datetime.now() - datetime.fromisoformat(timestamp)).total_seconds()} seconds FROM {from_sql.upper()}\n"
"-----------------------\n"
"--- Original query ---\n"
"-----------------------\n"
f"{query}"
"-----------------------\n"
"--- Transpiled query ---\n"
"-----------------------\n"
f"{double_quotes_added_query}"
)
except Exception as e:
logger.info(
f"{query_id} executed in {(datetime.now() - datetime.fromisoformat(timestamp)).total_seconds()} seconds FROM {from_sql.upper()}\n"
"-----------------------\n"
"--- Original query ---\n"
"-----------------------\n"
f"{query}"
"-----------------------\n"
"-------- Error --------\n"
"-----------------------\n"
f"{str(e)}"
)
error_message = f"{str(e)}"
error_flag = True
double_quotes_added_query = error_message
tables_list = []
joins_list = []
cte_values_subquery_list = []
unsupported_in_converted = []
executable = "NO"
return {
"supported_functions": supported,
"unsupported_functions": set(unsupported),
"udf_list": set(udf_list),
"converted-query": double_quotes_added_query, # Will contain error message if error_flag is True
"unsupported_functions_after_transpilation": set(unsupported_in_converted),
"executable": executable,
"tables_list": set(tables_list),
"joins_list": joins_list,
"cte_values_subquery_list": cte_values_subquery_list,
"error": error_flag,
"log_records": log_records,
}
except Exception as e:
logger.error(
f"{query_id} occurred at time {datetime.now().isoformat()} with processing time {(datetime.now() - datetime.fromisoformat(timestamp)).total_seconds()} FROM {from_sql.upper()}\n"
"-----------------------\n"
"--- Original query ---\n"
"-----------------------\n"
f"{query}"
"-----------------------\n"
"-------- Error --------\n"
"-----------------------\n"
f"{str(e)}"
)
return {
"supported_functions": [],
"unsupported_functions": [],
"udf_list": [],
"converted-query": f"Internal Server Error: {str(e)}",
"unsupported_functions_after_transpilation": [],
"executable": "NO",
"tables_list": [],
"joins_list": [],
"cte_values_subquery_list": [],
"error": True,
"log_records": log_records,
}
@app.post("/guardstats")
async def guardstats(
query: str = Form(...),
from_sql: str = Form(...),
to_sql: Optional[str] = Form("e6"),
schema: str = Form(...),
catalog: str = Form(...),
):
to_sql = to_sql.lower()
try:
supported_functions_in_e6 = load_supported_functions(to_sql)
# Functions treated as keywords (no parentheses required)
functions_as_keywords = [
"LIKE",
"ILIKE",
"RLIKE",
"AT TIME ZONE",
"||",
"DISTINCT",
"QUALIFY",
]
# Exclusion list for words that are followed by '(' but are not functions
exclusion_list = [
"AS",
"AND",
"THEN",
"OR",
"ELSE",
"WHEN",
"WHERE",
"FROM",
"JOIN",
"OVER",
"ON",
"ALL",
"NOT",
"BETWEEN",
"UNION",
"SELECT",
"BY",
"GROUP",
"EXCEPT",
]
# Regex patterns
function_pattern = r"\b([A-Za-z_][A-Za-z0-9_]*)\s*\("
keyword_pattern = (
r"\b(?:" + "|".join([re.escape(func) for func in functions_as_keywords]) + r")\b"
)
query, comment = strip_comment(query)
# Extract functions from the query
all_functions = extract_functions_from_query(
query, function_pattern, keyword_pattern, exclusion_list
)
supported, unsupported = categorize_functions(
all_functions, supported_functions_in_e6, functions_as_keywords
)
logger.info(f"supported: {supported}\n\nunsupported: {unsupported}")
original_ast = parse_one(query, read=from_sql)
tables_list = extract_db_and_Table_names(original_ast)
supported, unsupported = unsupported_functionality_identifiers(
original_ast, unsupported, supported
)
values_ensured_ast = ensure_select_from_values(original_ast)
query = values_ensured_ast.sql(dialect=from_sql)
tree = sqlglot.parse_one(query, read=from_sql, error_level=None)
tree2 = quote_identifiers(tree, dialect=to_sql)
double_quotes_added_query = tree2.sql(dialect=to_sql, from_dialect=from_sql)
double_quotes_added_query = replace_struct_in_query(double_quotes_added_query)
# Note: PRESERVE_FORMATTING not available here as no flags_dict
# Can be added if needed by adding feature_flags parameter to this endpoint
double_quotes_added_query = add_comment_to_query(double_quotes_added_query, comment)
all_functions_converted_query = extract_functions_from_query(
double_quotes_added_query, function_pattern, keyword_pattern, exclusion_list
)
supported_functions_in_converted_query, unsupported_functions_in_converted_query = (
categorize_functions(
all_functions_converted_query, supported_functions_in_e6, functions_as_keywords
)
)
double_quote_ast = parse_one(double_quotes_added_query, read=to_sql)
supported_in_converted, unsupported_in_converted = unsupported_functionality_identifiers(
double_quote_ast,
unsupported_functions_in_converted_query,
supported_functions_in_converted_query,
)
from_dialect_func_list = load_supported_functions(from_sql)
udf_list, unsupported = extract_udfs(unsupported, from_dialect_func_list)
executable = "NO" if unsupported_in_converted else "YES"
if storage_service_client is not None:
parsed = sqlglot.parse(double_quotes_added_query, error_level=None)
queries, tables = extract_sql_components_per_table_with_alias(parsed)
# tables = client.get_table_names(catalog_name="hive", db_name="tpcds_1000")
table_map = get_table_infos(tables, storage_service_client, catalog, schema)
logger.info("table info is ", table_map)
violations_found = validate_queries(queries, table_map)
joins_list = extract_joins_from_query(original_ast)
cte_values_subquery_list = extract_cte_n_subquery_list(original_ast)
if violations_found:
return {
"supported_functions": supported,
"unsupported_functions": unsupported,
"udf_list": udf_list,
"converted-query": double_quotes_added_query,
"unsupported_functions_after_transpilation": unsupported_in_converted,
"executable": executable,
"tables_list": tables_list,
"joins_list": joins_list,
"cte_values_subquery_list": cte_values_subquery_list,
"action": "deny",
"violations": violations_found,
"log_records": log_records,
}
else:
return {
"supported_functions": supported,
"unsupported_functions": unsupported,
"converted-query": double_quotes_added_query,
"unsupported_functions_after_transpilation": unsupported_in_converted,
"udf_list": udf_list,
"executable": executable,
"tables_list": tables_list,
"joins_list": joins_list,
"cte_values_subquery_list": cte_values_subquery_list,
"action": "allow",
"violations": [],
"log_records": log_records,
}
else:
detail = (
"Storage Service Not Initialized. Guardrail service status: " + ENABLE_GUARDRAIL
)
raise HTTPException(status_code=500, detail=detail)
except Exception as e:
raise HTTPException(status_code=500, detail=str(e))
if __name__ == "__main__":
import multiprocessing
# Calculate optimal workers based on CPU cores
cpu_cores = multiprocessing.cpu_count()
# Formula: (2 × CPU_cores) + 1, with min 2 and max 20
optimal_workers = min(max((2 * cpu_cores) + 1, 2), 20)
# Allow override via environment variable
workers = int(os.getenv("UVICORN_WORKERS", optimal_workers))
logger.info(f"Detected {cpu_cores} CPU cores, using {workers} workers")
uvicorn.run("converter_api:app", host="0.0.0.0", port=8100, proxy_headers=True, workers=workers)