Can't seem to get link.xml working with AWS SDK

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Hi, having a horribly difficult time here, been trying to fix this for hours...

We're using the AWS SDK and it seems to be getting stripped, specifically a constructor inside one of the assemblies. This is the error we're encountering in Xcode when the games runs on a device:

 MissingMethodException: Method not found: 'Default constructor not found...ctor() of Amazon.Util.Internal.PlatformServices.NetworkReachability'.

I've tried setting up the link.xml file in both of the following ways:

 <linker>
 
 <assembly fullname="AWSSDK.Core" preserve="all"/>
 <assembly fullname="AWSSDK.CognitoIdentity" preserve="all"/>
 <assembly fullname="AWSSDK.SecurityToken" preserve="all"/>
 <assembly fullname="AWSSDK.DynamoDBv2" preserve="all"/>
 
 <assembly fullname="UnityEngine">
     <type fullname="UnityEngine.Experimental.Networking.UnityWebRequest" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.UploadHandlerRaw" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.UploadHandler" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.DownloadHandler" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.DownloadHandlerBuffer" preserve="all" />
 </assembly>
 
 <assembly fullname="mscorlib">
     <namespace fullname="System.Security.Cryptography" preserve="all"/>
 </assembly>
 
 <assembly fullname="System">
     <namespace fullname="System.Security.Cryptography" preserve="all"/>
 </assembly>
 
 </linker>

...and this way...

 <linker>
 
 <assembly fullname="AWSSDK.Core">
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 <assembly fullname="AWSSDK.CognitoIdentity">
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 <assembly fullname="AWSSDK.SecurityToken">
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 <assembly fullname="AWSSDK.DynamoDBv2">
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 
 <assembly fullname="UnityEngine">
     <type fullname="UnityEngine.Experimental.Networking.UnityWebRequest" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.UploadHandlerRaw" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.UploadHandler" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.DownloadHandler" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.DownloadHandlerBuffer" preserve="all" />
 </assembly>
 
 <assembly fullname="mscorlib">
     <namespace fullname="System.Security.Cryptography" preserve="all"/>
 </assembly>
 
 <assembly fullname="System">
     <namespace fullname="System.Security.Cryptography" preserve="all"/>
 </assembly>
 
 </linker>

Neither of them seem to be working. Using the Assembly Browser in Mono and switching between C# and IL, I can see IL is missing the constructor that is clearly present in C#.

Any help would be greatly appreciated, running out of things to try. Thanks!

Answer 1

Answer by Durston88 · Jun 21, 2016 at 09:25 PM

So I did actually figure this out. Eventually I got it working by using the second method and also manually setting the import settings on the libraries from "Any Platform" to "iOS, Android, Editor".

This let it run and connect to DynamoDB, but then it was unable to parse the data (or something), giving the error "Type System.String is unsupported, it cannot be instantiated". This was fixed by reverting the Dynamo assembly line back to the original format. Anyway, if none of that makes sense, this is what it ended up looking like:

 <linker>
 
 <assembly fullname="UnityEngine">
     <type fullname="UnityEngine.Experimental.Networking.UnityWebRequest" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.UploadHandlerRaw" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.UploadHandler" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.DownloadHandler" preserve="all" />
     <type fullname="UnityEngine.Experimental.Networking.DownloadHandlerBuffer" preserve="all" />
 </assembly>
 
 <assembly fullname="mscorlib">
     <namespace fullname="System.Security.Cryptography" preserve="all"/>
 </assembly>
 
 <assembly fullname="System">
     <namespace fullname="System.Security.Cryptography" preserve="all"/>
 </assembly>
 
 
 <assembly fullname="AWSSDK.Core">
     <type fullname="Amazon.Util.Internal.PlatformServices.NetworkReachability" preserve="all"/>
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 <assembly fullname="AWSSDK.CognitoIdentity">
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 <assembly fullname="AWSSDK.SecurityToken">
    <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
 </assembly>
 <assembly fullname="AWSSDK.DynamoDBv2" preserve="all"/>
 
 </linker>

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rself · Jul 09, 2016 at 03:01 PM 0

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Bah, it is escaping the code snippets sorry. Using '[]' ins$$anonymous$$d of '<>'. Hey JumpDog, I am having the same "Type System.String is unsupported, it cannot be instantiated" issue, but reverting that back to the suggested format:

    [assembly fullname="AWSSD$$anonymous$$.DynamoDBv2" preserve="all" /]

didn't work for me. I also tried:

    [assembly fullname="AWSSD$$anonymous$$.DynamoDBv2"]
        [namespace fullname="Amazon.DynamoDBv2.Data$$anonymous$$odel" preserve="all" /]
      [/assembly]

And

    [assembly fullname="AWSSD$$anonymous$$.DynamoDBv2"/]

And

    [assembly fullname="AWSSD$$anonymous$$.DynamoDBv2"]
        [namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all" /]
      [/assembly]

No luck though. Any additional things you can think to try? Thanks!

Durston88 · Jul 10, 2016 at 08:31 PM 0

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Not sure, what I wrote above is what worked for me. I actually tried changing the import setting on those files back to "Any Platform" just now to see if that played a part, to make sure you did that too if so... but doesn't seem like that was part of it after all. If anything comes to $$anonymous$$d I'll post again but you tried what did it for me. Good luck.

rself Durston88 · Jul 15, 2016 at 09:06 PM 0

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@JumpDog no worries thanks for trying. I ended up changing each one to:

  [assembly fullname="AWSSD$$anonymous$$.CognitoIdentity"]
    [type fullname="Amazon.*" preserve="all" /]
    [namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all" /]
  [/assembly]

And that worked for me. Hopefully that helps someone else making the transition.

noamgat · Jul 19, 2016 at 03:31 AM 0

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Thanks guys! This was tremendously helpful. For those wondering WHY this fix is needed:

https://docs.unity3d.com/$$anonymous$$anual/iphone-playerSizeOptimization.html preserve="all" on an assembly only works in IL2CPP builds.

I guess amazon mostly did QA on iPhone, not on anrdoid using the $$anonymous$$ono2X scripting backend...

Answer 2

Answer by scottstephan · Dec 11, 2016 at 04:59 PM

This is a silly question, but where is link.xml meant to be? In /Assets ? Is that the assembly root?

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Durston88 · Dec 11, 2016 at 09:07 PM 1

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Yes, in the base Assets folder.

Answer 3

Answer by RedHatJef · Jul 04, 2019 at 09:55 PM

I ran into this to trying to get GameLift to work. No combination of anything I tried could make this work. The solution was to refer to the example unity project amazon provides with their AWSSDK.

Basically, just include this in the base Assets folder:

https://github.com/aws/aws-sdk-net/blob/master/sdk/test/Unity/Unity3DTests/Assets/link.xml

Once I did this, and rebuilt projects, it just magically worked.

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AdamBebko · Nov 24, 2020 at 08:47 PM 0

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link broken

Answer 4

Had a slightly different link.xml, moved it to the root of the asset folder, really not sure if it was this or changing from IL2CPP to Mono but finally got it working.

  <linker>
  
  <assembly fullname="UnityEngine">
      <type fullname="UnityEngine.Experimental.Networking.UnityWebRequest" preserve="all" />
      <type fullname="UnityEngine.Experimental.Networking.UploadHandlerRaw" preserve="all" />
      <type fullname="UnityEngine.Experimental.Networking.UploadHandler" preserve="all" />
      <type fullname="UnityEngine.Experimental.Networking.DownloadHandler" preserve="all" />
      <type fullname="UnityEngine.Experimental.Networking.DownloadHandlerBuffer" preserve="all" />
  </assembly>
  
  <assembly fullname="mscorlib">
      <namespace fullname="System.Security.Cryptography" preserve="all"/>
  </assembly>
  
  <assembly fullname="System">
      <namespace fullname="System.Security.Cryptography" preserve="all"/>
  </assembly>
  
  <assembly fullname="AWSSDK.Core" preserve="all"/>
  <assembly fullname="AWSSDK.CognitoIdentity" preserve="all"/>
  <assembly fullname="AWSSDK.SecurityToken" preserve="all"/>
  <assembly fullname="log4net" preserve="all"/>
  <assembly fullname="System.Configuration" preserve="all"/>
 
  <assembly fullname="AWSSDK.Core">
      <type fullname="Amazon.Util.Internal.PlatformServices.NetworkReachability" preserve="all"/>
     <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
  </assembly>
  <assembly fullname="AWSSDK.CognitoIdentity">
     <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
  </assembly>
  <assembly fullname="AWSSDK.SecurityToken">
     <namespace fullname="Amazon.Util.Internal.PlatformServices" preserve="all"/>
  </assembly>
  <assembly fullname="AWSSDK.DynamoDBv2" preserve="all"/>
  
  </linker>

Can't seem to get link.xml working with AWS SDK

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