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Add dir with some small projects
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55 changed files with 12 additions and 1212 deletions
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"""
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Interview note:
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This is a client "stub", here for demonstration and documentation
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purposes only.
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In a real production environment, this client would send requests over
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the network to a product detail backend service.
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The product detail backend service is responsible for retrieving product
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detail records from its datastore (e.g., a mysql database), and
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returning them to callers.
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"""
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class ProductDetailClient:
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def lookup(product_token):
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"""
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Given a product token, makes a blocking call to the lookup endpoint of
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the product detail backend service,
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and returns a corresponding product detail record, if found.
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If no record is found, returns None.
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Example result:
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{"token": "AAA",
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"description": "Red Bike",
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"price_cents": 45000}
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"""
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pass
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def batch_lookup(product_tokens):
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"""
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Given a list of product tokens, makes a blocking call to the
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batch lookup endpoint of the product detail backend service,
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and returns a map of product token to product detail record, for all
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that are found.
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Any records that cannot be found are ommitted from the result.
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Example result:
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{"AAA": {
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"token": "AAA",
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"description": "Red Bike",
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"price_cents": 45000},
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"BBB": {
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"token": "BBB",
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"description": "Blue Bike",
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"price_cents": 37500}}
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"""
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pass
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"""
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Interview note:
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This is a client "stub", here for demonstration and documentation
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purposes only.
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In a real production environment, this client would send requests over
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the network to a product search backend service.
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The product search backend service is responsible for performing lookups
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against a product search index (e.g., elasticsearch) and returning product
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tokens that are search result "hits".
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"""
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class ProductSearchClient:
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def search_for_all_in_price_range(lower_cents, upper_cents, start_record, num_records):
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"""
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Given a price range plus pagination information,
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returns a list of product tokens of products
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whose price falls in the range.
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The price range is inclusive - that is,
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a given price "p" matches if:
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upper_cents >= p >= lower_cents
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If no products have prices in the price range,
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returns an empty list.
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Product tokens are ordered by price, from lowest to highest.
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Out of the total list of possible product tokens,
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only the "page" of product tokens starting at the list position
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start_record, and ending at start_record+num_records, are returned.
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If start_record+num_records is greater than the number of actual
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result records, the resulting list size will be (accordingly)
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smaller than num_records.
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Example result:
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["AAA",
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"BBB"]
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"""
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pass
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43
small-projects/maze-puzzle/src/service.py
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43
small-projects/maze-puzzle/src/service.py
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import re
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TOKEN_REGEX = re.compile("^[0-9A-F-]+$")
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class Service:
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def __init__(self, product_detail_client, product_search_client):
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self.product_detail_client = product_detail_client
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self.product_search_client = product_search_client
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def lookup(self, product_token):
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"""
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Given a valid product token,
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lookup product detail information from the product detail backend service.
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- Results in Bad Request if the token is invalid
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- Results in Not Found if the product is unknown to the backend service
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"""
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if not TOKEN_REGEX.match(product_token):
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return {"status": 400}
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lookup_result = self.product_detail_client.lookup(product_token)
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if lookup_result:
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return {"status": 200, "product": lookup_result}
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else:
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return {"status": 404}
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def search_by_price_range(self, lower_cents, upper_cents, start_record, num_records):
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page_of_product_tokens = \
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self.product_search_client.search_for_all_in_price_range(
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lower_cents,
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upper_cents,
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start_record,
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num_records)
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product_detail_results = []
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for product_token in page_of_product_tokens:
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product_detail_results.append(self.lookup(product_token)["product"])
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return {"status": 200, "products": product_detail_results}
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if __name__ == "__main__":
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a = Service()
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print(a.lookup('aaa'))
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