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I got five results from five API-Calls using HttpS...
# replication-ask-ai
k
I got five results from five API-Calls using HttpStream. Now I need to use each of these results in request_bodies for 5 further API-Calls from another path of the base_url, can anybody help with that? I wanna keep using HttpStream. Can I do that in the same source.py file?
k
Yes, you can achieve this by using the concept of Nested Streams and Caching in Airbyte. This allows you to cache data from a stream onto a temporary file on disk, which can then be used in subsequent API calls. This is especially useful when dealing with streams that depend on the results of another stream. Here's how you can do it: 1. First, make your initial API calls using the 
HttpStream
class in your 
source.py
file. Ensure that you override the 
use_cache
property of the 
HttpStream
class to return 
True
. This will enable caching of the results of these API calls.
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python class InitialApiCalls(HttpStream):    ...  @property    def use_cache(self) -> bool:    return True
2. Next, create another class that inherits from the 
HttpSubStream
class. This class will make the subsequent API calls. The 
HttpSubStream
class overrides the 
stream_slices
method that returns a generator of all parent entries, allowing you to use the results of the initial API calls in your subsequent API calls.
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python class SubsequentApiCalls(HttpSubStream):    ...
3. In the 
SubsequentApiCalls
class, you can access the cached results of the initial API calls and use them in the request bodies of your subsequent API calls. Remember, all of this can be done in the same 
source.py
file. For more information, you can refer to the [Airbyte documentation on HTTP Streams](https://docs.airbyte.com/connector-development/cdk-python/http-streams).
k
@kapa.ai How do I populate the HttpSubStream Class? What are necessary methods?
@kapa.ai can you give me an example?
k
A message from kapa.ai
I'm sorry, but the provided extracts do not contain a specific example of populating the HttpSubStream Class. However, I can provide an example of how to populate the HTTPStream class based on the information given in the extracts. Here's a basic example of how to define an HTTPStream class:
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python class ExchangeRates(HttpStream):     url_base = "<http://api.exchangeratesapi.io/v1/>"     ...
In this example, the 
url_base
property is set to the base URL of the API endpoint. You would also need to implement methods like 
path
, 
parse_response
, and potentially others depending on your use case. For example, the 
path
function could be implemented to return the specific path of the API endpoint, and the 
parse_response
function would instruct the stream how to parse the API response. Please note that this is a simplified example and your actual implementation may require additional methods and properties. For more detailed information, please refer to the [HTTP Streams documentation](https://docs.airbyte.com/connector-development/cdk-python/http-streams).
k
@kapa.ai Does the same count for SubStreams?
k
A message from kapa.ai
Yes, the 
HttpSubStream
class inherits from the 
HttpStream
class, so it would require similar inputs and methods. However, the 
HttpSubStream
class is specifically designed for handling streams that depend on the results of another stream. One key difference is that the 
HttpSubStream
class overrides the 
stream_slices
method to return a generator of all parent entries. This is particularly useful when dealing with nested streams or when you want to cache data from a parent stream onto a temporary file on disk. Here's an example of how you might use caching in a parent/child relationship with 
HttpStream
and `HttpSubStream`:
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python class Employees(HttpStream):       ...       @property       def use_cache(self) -> bool:           return True      class EmployeeDetails(HttpSubStream):       ...
In this example, caching is enabled for the parent stream (
Employees
) by overriding the 
use_cache
property to return 
True
. The child stream (
EmployeeDetails
) inherits from the 
HttpSubStream
class. Please note that this is a simplified example and your actual implementation may require additional methods and properties. For more detailed information, please refer to the [HTTP Streams documentation](https://docs.airbyte.com/connector-development/cdk-python/http-streams).
k
@kapa.ai So does the HttpSubStream require an init function as well as an url_base etc.?
k
A message from kapa.ai
Yes, the 
HttpSubStream
class would typically require an 
__init__
function, similar to the 
HttpStream
class. The 
__init__
function is used to initialize the stream object with any necessary parameters. The 
url_base
property is also required for 
HttpSubStream
, as it is for 
HttpStream
. This property is used to set the base URL for the API endpoint. Here's a simplified example of how you might define an 
HttpSubStream
class:
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python class ChildStream(HttpSubStream):     def __init__(self, parent_stream: HttpStream):         super().__init__(parent_stream=parent_stream)      url_base = "<http://api.example.com/v1/>"     ...
In this example, the 
__init__
function is used to initialize the 
ChildStream
object with a reference to the parent stream. The 
url_base
property is set to the base URL of the API endpoint. Please note that this is a simplified example and your actual implementation may require additional methods and properties. For more detailed information, please refer to the [HTTP Streams documentation](https://docs.airbyte.com/connector-development/cdk-python/http-streams).
k
@kapa.ai How does the subStream access the caches result of the parent stream?
k
A message from kapa.ai
The 
HttpSubStream
class accesses the cached results of the parent stream through the 
stream_slices
method. This method returns a generator of all parent entries, which are the cached results of the parent stream. When the 
HttpSubStream
synchronizes, it uses the data written to the cache file by the parent stream, rather than performing a full HTTP request again. This is particularly useful when dealing with nested streams or streams that depend on the results of another stream. Here's a simplified example of how you might use caching in a parent/child relationship with 
HttpStream
and `HttpSubStream`:
Copy code
python class Employees(HttpStream):       ...       @property       def use_cache(self) -> bool:           return True      class EmployeeDetails(HttpSubStream):       ...
In this example, caching is enabled for the parent stream (
Employees
) by overriding the 
use_cache
property to return 
True
. The child stream (
EmployeeDetails
) inherits from the 
HttpSubStream
class and can access the cached results of the parent stream. Please note that this is a simplified example and your actual implementation may require additional methods and properties. For more detailed information, please refer to the [HTTP Streams documentation](https://docs.airbyte.com/connector-development/cdk-python/http-streams).
k
@kapa.ai give me the complete class EmployeeDetails(HttpSubStream)
k
A message from kapa.ai
@Karsten Bruns That's a great question, but unfortunately I am only capable of responding to a maximum of five questions per thread. Don't hesitate to create a new thread for any further questions you have though. I'm here to help!
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