Add EDSM & Elite Status api

[irongut]

Port GalNet EDSM & Elite Status api from EliteALD. Add more EDSM api methods. Allow new services consuming code to add new EDSM api methods.

Elite Status

Docs

• [X] Change service to a singleton that caches & returns the data.
• [X] Allow variable cache time.
• [X] Documentation.

Requires:

• Models/EliteStatus.cs
• Services/EDSMService.cs
• Services/EliteStatusService.cs
• Cache (for DownloadService) #2
• DownloadService #4

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Systems

Docs

System Info

Provides system coords, star info, permit requirement and basic system info.

Systems

Provides info for a list of systems from a list of system names.

Systems in Sphere

Lists systems within a radius of a given system, can include all the details from System info.

Systems in Cube

Lists systems within a cube centered on a given system, can include all the details from System info.

• [x] System Info
• [x] Systems
• [x] Systems in Sphere
• [x] Systems in Cube
• [x] Rework memory cache
• [x] Rework storage cache #31
• [x] Documentation

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System

Docs

Stations

Provides information about the stations in a system.

Market

Provides market information from a market id or system name & station name.

Shipyard

Provides shipyard information from a market id or system name & station name.

Outfitting

Provides outfitting information from a market id or system name & station name.

Factions

Provides BGS information for the factions in a system.

• [x] Stations
• [x] Market
• [x] Shipyard
• [x] Outfitting
• [x] Factions
• [x] Documentation

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Cache Rework

Memory Cache

Cache last result and options. Return cached result if parameters (e.g. system name) & options match and the data has not expired.

Storage Cache

Currently handled at the lowest level by DownloadService.

Ideas

1. Add a method to DownloadService that downloads without caching and move caching to EdsmService. This would be significantly different to the other APIs in the library.
2. Add a method to DownloadService that implements the new cache strategy and use where relevant. This would keep the caching code in the same class.
3. Replace the current caching code in DownloadService with the new strategy & use it everywhere. Method calls will change & EliteALD will lose any cached data after upgrade to the new code but all apis would be consistent.

Strategy

Cache result & last updated using the method parameters (EdsmService) or request URL (DownloadService) in the key names. Return cached result if keys exist and have not expired.

Concerns

• The method parameters or request URL can be quite long and could exceed the maximum length of a key name in the cache provided by the consuming app. Using a hash of the parameters / URL should prevent that while still being unique. SHA256 should be performant & reliable on all platforms.
• Storage will eventually fill with expired results that have not been requested again. Consuming apps will need to periodically flush the cache of expired results.