Load WSDL files from the cache

[jonrober-80]

Description

We discussed with @raymondfeng the idea of being able to load WSDL files from memory into strong-soap (as opposed to from a file system or a url). Reymond suggested making use of the existing loading structure (as used by WSDL.open(...) ), which can be described as:

1. Read the contents of the file form the file system/url.
2. Create a WSDL object using the var wsdl = new WSDL(definition....) constructor.
3. Perform a load() on this object to process the contents of the wsdl, using wsdl.load(....)

There are 2 usecases that this PR is aiming to cover.

1. Load a single wsdl file from memory.
2. Load a multipart wsdl (a collection of wsdls and xsd files) from memory.

Usecase 1) could be achieved by the current strong-soap functionality, so to achieve this all this PR does it to add a new test to demonstrate it.

Usecase 2) could technically be achieved by the current strong-soap functionality by reading the files from the file system, creating WSDL objects from them, loading each object into options.WSDL_CACHE, then calling load(). The problem was that the order these objects were loaded in was important and the load would fail if they were done in the wrong order. The implication of this was the in order to be able to dynamically load a multipart wsdl into strong-soap, the user would be required to parse the tree structure then call load() in the correct order (which is one of the jobs that strong-soap was already doing for free).

As a result this PR makes some small updates to the loading processes in order to recognize WSDLs which have been added to the cache, but not had load() called against them. If any of these are found then load() will be called. This is done by the introduction of an isLoaded flag which will get set in the objects load() function.

The files used in the tests are ones already present in this repository, however, in order to keep this test self contained, they have been copied to the directory wsdl/from-memory

Related issues

Checklist

• New tests added or existing tests modified to cover all changes
• Code conforms with the style
  guide

[slnode]

Can one of the admins verify this patch? To accept patch and trigger a build add comment ".ok\W+to\W+test."

[raymondfeng]

@jonrober-80 Thank you for the patch. I'll take a look soon.

[raymondfeng]

Released as strong-soap@1.11.0