Config server pattern in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the central configuration server URL.

Microservices

configServerUrl = "http://[1]:8888"

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Adatabase

Blocalhost

Cconfig-server

Dservice-registry

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'localhost' instead of the config server name.

Confusing the config server with the service registry.

The config server URL should point to the central configuration server, commonly named 'config-server'.

2fill in blank

medium

Complete the code to fetch configuration from the config server using HTTP GET.

Microservices

response = httpClient.get(f"http://config-server:8888/[1]/default")

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Aservice-name

Benvironment

Cconfig

Dapplication

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'service-name' which is not the standard path segment.

Using 'environment' which is usually a separate path segment.

The config server fetches configuration based on the application name, so 'application' is used in the URL.

3fill in blank

hard

Fix the error in the config client code to reload configuration on startup.

Microservices

def load_config():
    config = fetch_config_from_server()
    if config is None:
        raise [1]("Config not found")
    return config

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ARuntimeError

BValueError

CConfigError

DKeyError

Attempts:

3 left

💡 Hint

Common Mistakes

Using ValueError which is for invalid values, not missing config.

Using KeyError which is for missing dictionary keys.

Raising a RuntimeError is appropriate when configuration loading fails at runtime.

4fill in blank

hard

Fill both blanks to complete the config server's response handling code.

Microservices

if response.status_code == 200:
    config_data = response.[1]()
else:
    log.error("Failed to fetch config: " + response.[2])

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Ajson

Btext

Ccontent

Dstatus_code

Attempts:

3 left

💡 Hint

Common Mistakes

Using content which returns bytes, not parsed data.

Using status_code which is an integer, not a message.

The config data is parsed as JSON, and error messages are read as text from the response.

5fill in blank

hard

Fill all three blanks to complete the microservice config client initialization code.

Microservices

class ConfigClient:
    def __init__(self, [1]):
        self.server_url = [2]
        self.config = self.[3]()

    def fetch_config(self):
        # fetch config logic here
        pass

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Aserver_url

Bload_config

Cconfig_server_url

Dfetch_config

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing parameter and attribute names.

Calling 'fetch_config' instead of 'load_config' in constructor.

The constructor takes 'config_server_url' as parameter, assigns it to 'server_url', and calls 'load_config' to initialize config.