updates

python/introduction/part-5.database.redis/customers.json

@@ -0,0 +1,37 @@
+{
+  "a": {
+    "customerID": "a",
+    "firstName": "James",
+    "lastName": "Baker"
+  },
+  "b": {
+    "customerID": "b",
+    "firstName": "Jonathan",
+    "lastName": "D"
+  },
+  "c": {
+    "customerID": "c",
+    "firstName": "Aleem",
+    "lastName": "Janmohamed"
+  },
+  "d": {
+    "customerID": "d",
+    "firstName": "Ivo",
+    "lastName": "Galic"
+  },
+  "e": {
+    "customerID": "e",
+    "firstName": "Joel",
+    "lastName": "Griffiths"
+  },
+  "f": {
+    "customerID": "f",
+    "firstName": "Michael",
+    "lastName": "Spinks"
+  },
+  "g": {
+    "customerID": "g",
+    "firstName": "Victor",
+    "lastName": "Savkov"
+  }
+}

python/introduction/part-5.database.redis/requirements.txt

@@ -1,2 +1,2 @@
 Flask == 2.0.2
-Redis == 3.5.3
+redis == 3.5.3

python/introduction/part-5.database.redis/src/app.py

@@ -1,99 +1,101 @@
-import os.path
+import os.path
-import csv
+import csv
-import os
+import json
-import json
+import time
-import time
+from flask import Flask
-from flask import Flask
+from flask import request
-from flask import request
+import os
-import redis
+from redis.sentinel import Sentinel
-from redis.sentinel import Sentinel
+
-
+dataPath = "./customers.json"
-redis_sentinels = os.environ.get('REDIS_SENTINELS')
+
-redis_master_name = os.environ.get('REDIS_MASTER_NAME')
+redis_sentinels = os.environ.get('REDIS_SENTINELS')
-redis_password = os.environ.get('REDIS_PASSWORD')
+redis_master_name = os.environ.get('REDIS_MASTER_NAME')
-
+redis_password = os.environ.get('REDIS_PASSWORD')
-class Customer:
+
-  def __init__(self, c="",f="",l=""):
+def redis_command(command, *args):
-    self.customerID = c
+  max_retries = 3
-    self.firstName  = f
+  count = 0
-    self.lastName   = l
+  backoffSeconds = 5
-  def fullName(self):
+  while True:
-    return self.firstName + " " + self.lastName
+    try:
-
+      return command(*args)
-def redis_command(command, *args):
+    except (redis.exceptions.ConnectionError, redis.exceptions.TimeoutError):
-  max_retries = 3
+      count += 1
-  count = 0
+      if count > max_retries:
-  backoffSeconds = 5
+        raise
-  while True:
+      print('Retrying in {} seconds'.format(backoffSeconds))
-    try:
+      time.sleep(backoffSeconds)
-      return command(*args)
+
-    except (redis.exceptions.ConnectionError, redis.exceptions.TimeoutError):
+class Customer:
-      count += 1
+  def __init__(self, c="",f="",l=""):
-      if count > max_retries:
+    self.customerID = c
-        raise
+    self.firstName  = f
-    print('Retrying in {} seconds'.format(backoffSeconds))
+    self.lastName   = l
-    time.sleep(backoffSeconds)
+  def fullName(self):
-
+    return self.firstName + " " + self.lastName
-def getCustomers():
+
-  customers = {}
+def getCustomers():
-  customerIDs = redis_command(redis_master.scan_iter, "*")
+  customers = {}
-  for customerID in customerIDs:
+  customerIDs = redis_command(redis_master.scan_iter, "*")
-    customer = getCustomer(customerID)
+  for customerID in customerIDs:
-    customers[customer["customerID"]] = customer
+    customer = getCustomer(customerID)
-  
+    customers[customer["customerID"]] = customer
-  return customers
+  return customers
-
+
-def getCustomer(customerID):
+def getCustomer(customerID):
-  customer = redis_command(redis_master.get, customerID)
+  customer = redis_command(redis_master.get, customerID)
-  
+  
-  if customer == None:
+  if customer == None:
-    return {}
+    return {}
-  else:
+  else:
-    c = str(customer, 'utf-8')
+    c = str(customer, 'utf-8')
-    return json.loads(c)
+    return json.loads(c)
-
+
-def updateCustomer(customer):
+def updateCustomer(customer):
-  redis_command(redis_master.set, customer.customerID, json.dumps(customer.__dict__))
+  redis_command(redis_master.set,customer.customerID, json.dumps(customer.__dict__) )
-
+
-def updateCustomers(customers):
+def updateCustomers(customers):
-  for customer in customers:
+  for customer in customers:
-    updateCustomer(customer)
+    updateCustomer(customer)
-  
+
-app = Flask(__name__)
+app = Flask(__name__)
-
+
-sentinels = []
+sentinels = []
-
+
-for s in redis_sentinels.split(","):
+for s in redis_sentinels.split(","):
-  sentinels.append((s.split(":")[0], s.split(":")[1]))
+  sentinels.append((s.split(":")[0], s.split(":")[1]))
-
+
-redis_sentinel = Sentinel(sentinels, socket_timeout=5)
+redis_sentinel = Sentinel(sentinels, socket_timeout=5)
-redis_master = redis_sentinel.master_for(redis_master_name,password = redis_password, socket_timeout=5)
+redis_master = redis_sentinel.master_for(redis_master_name,password = redis_password, socket_timeout=5)
-
+
-@app.route("/", methods=['GET'])
+
-def get_customers():
+@app.route("/", methods=['GET'])
-  customers = getCustomers()
+def get_customers():
-  return json.dumps(customers)
+    customers = getCustomers()
-
+    return json.dumps(customers)
-@app.route("/get/<string:customerID>", methods=['GET'])
+
-def get_customer(customerID):
+@app.route("/get/<string:customerID>", methods=['GET'])
-    customer = getCustomer(customerID)
+def get_customer(customerID):
-
+    customer = getCustomer(customerID)
-    if customer == {}:
+
-      return {}, 404
+    if customer == {}:
-    else:
+      return {}, 404
-      return customer
+    else:
-
+      return customer
-@app.route("/set", methods=['POST'])
+
-def add_customer():
+@app.route("/set", methods=['POST'])
-    jsonData = request.json
+def add_customer():
-
+  jsonData = request.json
-    if "customerID" not in jsonData:
+
-      return "customerID required", 400
+  if "customerID" not in jsonData:
-    if "firstName" not in jsonData:
+      return "customerID required", 400
-      return "firstName required", 400
+  if "firstName" not in jsonData:
-    if "lastName" not in jsonData:
+      return "firstName required", 400
-      return "lastName required", 400
+  if "lastName" not in jsonData:
-    
+      return "lastName required", 400
-    customer = Customer( jsonData["customerID"], jsonData["firstName"], jsonData["lastName"])
+
-    updateCustomer(customer)
+  customer = Customer( jsonData["customerID"], jsonData["firstName"], jsonData["lastName"])
-    return "success", 200
+  updateCustomer(customer)
+  return "success", 200
+