Ods-replication-pg2pg

.github/workflows/docker-pg2pg.yaml

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+name: Push to GHCR
+
+on:
+  push:
+    branches: [ "ods-replication-pg2pg" ]
+
+env:
+  # DF-NOTE: pull ghcr.io/bcgov/nr-dap-ods-trino:main
+  REGISTRY: ghcr.io
+  DOCKERFILE_PATH: shared/ods_replication_pg2pg
+  IMAGE_NAME: ${{ github.repository }}-pg2pg
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@v3.3.0
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
+
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
+        with:
+          # DF-NOTE: to help the action find the Dockerfile to build from
+          context: ${{ env.DOCKERFILE_PATH }}/
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

shared/ods_replication_pg2pg/Dockerfile

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+FROM python:3.11.4-slim-buster
+
+WORKDIR    /app
+
+# PostgreSQL library 
+
+RUN apt-get update \
+    && apt-get -y install libpq-dev gcc \
+    && pip install psycopg2
+
+ADD *.py .
+
+COPY requirements.txt requirements.txt
+
+RUN pip3 install -r requirements.txt
+
+CMD ["python3", "./data_replication_pg2pg.py"]

shared/ods_replication_pg2pg/data_replication_pg2pg.py

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+#!/usr/bin/env python
+# coding: utf-8
+
+# In[1]: Imports
+# refer if block at line 38, some imports are conditional
+import psycopg2
+import psycopg2.pool
+import psycopg2.extras
+from psycopg2.extras import execute_batch
+import configparser
+import time
+import json
+import concurrent.futures
+from datetime import datetime
+import sys
+import os
+import argparse
+
+
+start = time.time()
+
+# In[3]: Retrieve Oracle database configuration
+src_postgres_username = os.environ['DB_USERNAME']
+src_postgres_password = os.environ['DB_PASSWORD']
+src_postgres_host = os.environ['DB_HOST']
+src_postgres_port = os.environ['DB_PORT']
+src_postgres_database = os.environ['DATABASE']
+# In[4]: Retrieve Postgres database configuration
+postgres_username = os.environ['ODS_USERNAME']
+postgres_password = os.environ['ODS_PASSWORD']
+postgres_host = os.environ['ODS_HOST']
+postgres_port = os.environ['ODS_PORT']
+postgres_database = os.environ['ODS_DATABASE']
+# In[5]: Script parameters
+mstr_schema = os.environ['MSTR_SCHEMA']
+app_name = os.environ['APP_NAME']
+concurrent_tasks = int(os.environ['CONCUR_TASKS'])
+audit_table = 'audit_batch_status'
+current_date = datetime.now().strftime('%Y-%m-%d')
+
+#concurrent_tasks = int(concurrent_tasks)    
+#In[5]: Concurrent tasks - number of tables to be replicated in parallel
+#concurrent_tasks = 5
+
+# In[6]: Set up Oracle connection pool
+# In[7]: Setup Postgres Pool 
+
+try:
+    SrcPgresPool = psycopg2.pool.ThreadedConnectionPool(
+        minconn=concurrent_tasks, 
+        maxconn=concurrent_tasks,
+        host=src_postgres_host, 
+        port=src_postgres_port, 
+        dbname=src_postgres_database, 
+        user=src_postgres_username, 
+        password=src_postgres_password
+    )
+    print('Source Postgres Connection Successful')
+    # Exit with code 0 (success) if connection successful
+except Exception as e:
+    print(f'Error connecting to Source PostgreSQL: {e}')
+    # Exit with code 1 (failure) if connection unsuccessful
+    sys.exit(1)
+
+
+# In[7]: Setup Postgres Pool 
+try:
+    PgresPool = psycopg2.pool.ThreadedConnectionPool(
+        minconn=concurrent_tasks, 
+        maxconn=concurrent_tasks,
+        host=postgres_host, 
+        port=postgres_port, 
+        dbname=postgres_database, 
+        user=postgres_username, 
+        password=postgres_password
+    )
+    print('Target Postgres Connection Successful')
+
+except psycopg2.OperationalError as e:
+    print(f'Error connecting to Target PostgreSQL: {e}')
+    # Exit with code 1 (failure) if connection unsuccessful
+    sys.exit(2)
+
+def del_audit_entries_rerun(current_date):
+  postgres_connection  = PgresPool.getconn()  
+  postgres_cursor = postgres_connection.cursor()
+  try:
+    del_sql = f"""
+    DELETE FROM {mstr_schema}.{audit_table} c
+    where application_name='{app_name}' and batch_run_date='{current_date}'
+    """
+    postgres_cursor.execute(del_sql)
+    postgres_connection.commit()
+    postgres_cursor.close()
+    PgresPool.putconn(postgres_connection)
+    print(del_sql)
+    return None
+  except Exception as e:
+      print(f"Failed to delete audit entries for application name {app_name} and date '{current_date}': {str(e)}")
+      sys.exit(3)
+
+# Function to insert the audit batch status entry
+def audit_batch_status_insert(table_name,status):
+  postgres_connection  = PgresPool.getconn()  
+  postgres_cursor = postgres_connection.cursor()
+  try:
+    audit_batch_status_query = f"""INSERT INTO {mstr_schema}.{audit_table} VALUES ('{table_name}','{app_name}','replication','{status}',current_date)"""
+    print(audit_batch_status_query)
+    postgres_cursor.execute(audit_batch_status_query)
+    postgres_connection.commit()
+    print(f"Record inserted into audit batch status table")
+    return None
+  except Exception as e:
+      print(f"Error inserting record into to audit batch status table: {str(e)}")
+      sys.exit(4)
+      return None
+  finally:
+        # Return the connection to the pool
+        if postgres_connection:
+            postgres_cursor.close()
+            PgresPool.putconn(postgres_connection)
+
+# In[8]: Function to get active rows from master table
+def get_active_tables(mstr_schema,app_name):
+  postgres_connection  = PgresPool.getconn()  
+  postgres_cursor = postgres_connection.cursor()
+  list_sql = f"""
+  SELECT application_name,source_schema_name,source_table_name,target_schema_name,target_table_name,truncate_flag,cdc_flag,full_inc_flag,cdc_column,replication_order,customsql_ind,customsql_query
+  from {mstr_schema}.cdc_master_table_list c
+  where  active_ind = 'Y' and application_name='{app_name}'
+  order by replication_order, source_table_name
+  """
+  try:  
+    with postgres_connection.cursor() as curs:
+                curs.execute(list_sql)
+                rows = curs.fetchall()
+    postgres_connection.commit()
+    postgres_cursor.close()
+    PgresPool.putconn(postgres_connection)
+    return rows
+  except Exception as e:
+    print(f"Error selecting record from cdc_master_table_list table: {str(e)}")
+    sys.exit(5)
+    return None
+
+
+# In[9]: Function to extract data from Oracle
+def extract_from_srcpg(table_name,source_schema,customsql_ind,customsql_query):
+    # Acquire a connection from the pool
+    srcpostgres_connection = SrcPgresPool.getconn()
+    srcpostgres_cursor = srcpostgres_connection.cursor()   
+    try:
+        if customsql_ind == "Y":
+            # Use placeholders in the query and bind the table name as a parameter
+            sql_query=customsql_query
+            print(sql_query)
+            srcpostgres_cursor.execute(sql_query)
+            rows = srcpostgres_cursor.fetchall()
+            #OrcPool.release(oracle_connection)
+            return rows  
+        else:
+            sql_query = f'SELECT * FROM {source_schema}.{table_name}'
+            print(sql_query)
+            srcpostgres_cursor.execute(sql_query)
+            rows = srcpostgres_cursor.fetchall()
+            #OrcPool.release(oracle_connection)
+            return rows
+
+    except Exception as e:
+        audit_batch_status_insert(table_name,'failed')
+        print(f"Error extracting data from SrcPostgres: {str(e)}")
+        #OrcPool.release(oracle_connection)  #Temporary change
+        return []
+
+    finally:
+        # Return the connection to the pool
+        if srcpostgres_connection:
+            srcpostgres_cursor.close()
+            SrcPgresPool.putconn(srcpostgres_connection)
+# In[10]: Function to load data into Target PostgreSQL using data from Source Oracle
+def load_into_postgres(table_name, data,target_schema):
+    postgres_connection = PgresPool.getconn()
+    postgres_cursor = postgres_connection.cursor()
+    try:
+        # Delete existing data in the target table
+        delete_query = f'TRUNCATE TABLE {target_schema}.{table_name}'
+        postgres_cursor.execute(delete_query)
+
+        # Build the INSERT query with placeholders
+        insert_query = f'INSERT INTO {target_schema}.{table_name} VALUES ({", ".join(["%s"] * len(data[0]))})'
+        #insert_query = f'INSERT INTO {target_schema}.{table_name} VALUES %s'
+
+        # Use execute_batch for efficient batch insert
+        with postgres_connection.cursor() as cursor:
+            # Prepare the data as a list of tuples
+            data_to_insert = [(tuple(row)) for row in data]
+            execute_batch(cursor, insert_query, data_to_insert)
+            postgres_connection.commit()
+            # Insert record to audit batch table        
+            audit_batch_status_insert(table_name,'success')
+
+
+    except Exception as e:
+        print(f"Error loading data into PostgreSQL: {str(e)}")
+        audit_batch_status_insert(table_name,'failed')
+    finally:
+        # Return the connection to the pool
+        if postgres_connection:
+            postgres_cursor.close()
+            PgresPool.putconn(postgres_connection)
+
+# In[11]: Function to call both extract and load functions
+def load_data_from_src_tgt(table_name,source_schema,target_schema,customsql_ind,customsql_query):
+        # Extract data from Oracle
+        print(f'Source: Thread {table_name} started at ' + datetime.now().strftime("%H:%M:%S"))
+        srcpg_data = extract_from_srcpg(table_name,source_schema,customsql_ind,customsql_query)  # Ensure table name is in uppercase
+        print(f'Source: Extraction for {table_name} completed at ' + datetime.now().strftime("%H:%M:%S"))
+
+        if srcpg_data:
+            # Load data into PostgreSQL
+            load_into_postgres(table_name, srcpg_data, target_schema)
+            print(f"Target: Data loaded into table: {table_name}")
+            print(f'Target: Thread {table_name} ended at ' + datetime.now().strftime("%H:%M:%S"))
+
+def check_failed_tables(mstr_schema,app_name,current_date):
+  postgres_connection  = PgresPool.getconn()  
+  postgres_cursor = postgres_connection.cursor()
+  list_sql = f"""
+  SELECT object_name
+  from {mstr_schema}.audit_batch_status c
+  where application_name='{app_name}' and batch_run_date='{current_date}' and object_execution_status='failed'
+  """
+  try:  
+    with postgres_connection.cursor() as curs:
+                curs.execute(list_sql)
+                rows = curs.fetchall()
+    postgres_connection.commit()
+    postgres_cursor.close()
+    PgresPool.putconn(postgres_connection)
+    return rows
+  except Exception as e:
+    print(f"Error selecting record from cdc_master_table_list table: {str(e)}")
+    sys.exit(6)
+    return None
+
+
+
+# In[12]: Initializing concurrency
+if __name__ == '__main__':
+    # Main ETL process
+    active_tables_rows =get_active_tables(mstr_schema,app_name) 
+    #print(active_tables_rows)
+    tables_to_extract = [(row[2],row[1],row[3],row[10],row[11]) for row in active_tables_rows]
+
+    print(f"tables to extract are {tables_to_extract}")
+    print(f'No of concurrent tasks:{concurrent_tasks}')
+     #Delete audit entries for rerun on same day
+    del_audit_entries_rerun(current_date)
+    # Using ThreadPoolExecutor to run tasks concurrently
+    with concurrent.futures.ThreadPoolExecutor(max_workers=concurrent_tasks) as executor:
+        # Submit tasks to the executor
+        future_to_table = {executor.submit(load_data_from_src_tgt, table[0],table[1],table[2],table[3],table[4]): table for table in tables_to_extract}
+
+        # Wait for all tasks to complete
+        concurrent.futures.wait(future_to_table)
+
+        # Print results
+        for future in future_to_table:
+            table_name = future_to_table[future]
+            try:
+                # Get the result of the task, if any
+                future.result()
+            except Exception as e:
+                # Handle exceptions that occurred during the task
+                print(f"Error replicating {table_name}: {e}")
+                audit_batch_status_insert(table_name[0],'failed')
+
+    get_failed_tables_rows = check_failed_tables(mstr_schema,app_name,current_date)
+
+    if len(get_failed_tables_rows)>0:
+        print("Some of the tables are failed while replication for an application:",{app_name})
+        sys.exit(7)
+    else:
+        print("All the tables have been successfully replicated for an application:",{app_name})
+
+
+    # record end time
+    end = time.time()
+    SrcPgresPool.closeall()
+    PgresPool.closeall()
+
+    print("ETL process completed successfully.")
+    print("The time of execution of the program is:", (end - start) , "secs")
+
+sys.exit(0)

shared/ods_replication_pg2pg/requirements.txt

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+oracledb==1.3.1
+psycopg2==2.9.6
+pandas==2.0.2
+openpyxl==3.1.2
+configparser==6.0.0
+dbt-postgres==1.6.4
+PyYAML==6.0
+pyodbc==4.0.39
+python-dotenv==1.0.0
+boto3==1.28.10
+requests==2.31.0
+XlsxWriter==3.1.2