Still have not got my head around a proper binding.
I want to write bindings for https://github.com/awslabs/aws-mobile-appsync-sdk-js to use it in Reason. Anyone feel like a pair programming session to grind it out together or teach me the proper way? It would be greatly appreciated.
Thank you.
Have you seen this post? Posting there and sharing what you have so far in code may get you more help. I am pretty new to writing bindings as well. Good luck!
@idkjs I don’t use AWS AppSync but this should work
[@bs.module "aws-appsync"] [@bs.new]
external makeAWSAppSyncClient :
{
.
"url": Js.Nullable.t(string),
"region": Js.Nullable.t(string),
"auth":
Js.Nullable.t(
{
.
"type": string,
"apiKey": string,
},
),
} =>
'a =
"AWSAppSyncClient";
let createAWSAppSyncClient = (~url=?, ~region=?, ~auth=?, ()) => {
let appSyncClientOptions = {
"url": Js.Nullable.fromOption(url),
"region": Js.Nullable.fromOption(region),
"auth": Js.Nullable.fromOption(auth),
};
makeAWSAppSyncClient(appSyncClientOptions);
};@drejohnson you know where I’m going with this…reason-apollo. Anything that would stop this from working with that? I’m guessing we would just pass the created client to the ReasonApollo Provider. About to try.
I dont think I have my syntax right here.
//AppSyncConfig.re
type config = {
.
"graphqlEndpoint": string,
"region": string,
"authenticationType": string,
"apiKey": string,
};
let config = {
"graphqlEndpoint": "https://h25cvu6lonfilcrryg7xo5fjne.appsync-api.eu-west-1.amazonaws.com/graphql",
"region": "eu-west-1",
"authenticationType": "API_KEY",
"apiKey": "da2-2ajoq2qmsvgspdw6hljfdj2lb4",
};
Creating the client:
//Client.re
open AppSyncConfig;
let auth = {"type": config.authenticationType, "apiKey": config.apiKey};
let client =
AWS.AppSync.createAWSAppSyncClient({
"url": config.graphqlEndpoint,
"region": config.region,
"auth": auth,
});
Seems like a basic misunderstanding on records here: Why is The record field authenticationType can't be found. when its clearly defined?
Error:
/Users/prisc_000/code/APPSYNC/re-aws/src/aws/Client.re 4:28-45
2 │ open AppSyncConfig;
3 │
4 │ let auth = {"type": config.authenticationType, "apiKey": config.apiKey}
;
5 │
6 │ let client =
The record field authenticationType can't be found.
If it's defined in another module or file, bring it into scope by:
- Annotating it with said module name: let baby = {myModule.age: 3}
- Or specifying its type: let baby: MyModule.person = {age: 3}
ninja: build stopped: subcommand failed.
>>>> Finish compiling(exit: 1)
The AppSync binding
/// AWS.re
module AppSync = {
[@bs.module "aws-appsync"] [@bs.new]
external makeAWSAppSyncClient :
{
.
"url": Js.Nullable.t(string),
"region": Js.Nullable.t(string),
"auth":
Js.Nullable.t(
{
.
"type": string,
"apiKey": string,
},
),
} =>
'a =
"AWSAppSyncClient";
let createAWSAppSyncClient = (~url=?, ~region=?, ~auth=?, ()) => {
let appSyncClientOptions = {
"url": Js.Nullable.fromOption(url),
"region": Js.Nullable.fromOption(region),
"auth": Js.Nullable.fromOption(auth),
};
makeAWSAppSyncClient(appSyncClientOptions);
};
};
Your instantiation of the client should look like this
let client =
createAWSAppSyncClient(
~url=config##graphqlEndpoint,
~region=config##region,
~auth={
"type": config##authenticationType,
"apiKey": config##apiKey,
},
(),
);
Any ## and Js.t are deprecated in favor of bs.deriving abstract btw
@chenglou do the docs reflect this yet?
So trying to apply bs.deriving abstract. This is what I have:
//AWS.re
module AppSyncConfig = {
[@bs.deriving abstract]
type auth = {
type_: string,
apiKey: string,
};
[@bs.deriving abstract]
type t = {
url: string,
region: string,
auth,
};
let make = t;
};
module AppSync = {
[@bs.module "aws-appsync"] [@bs.new]
external makeAWSAppSyncClient : AppSyncConfig.t => 'a = "AWSAppSyncClient";
let createAWSAppSyncClient = (~url, ~region, ~auth, ()) => {
let appSyncClientOptions = AppSyncConfig.t(~url, ~region, ~auth);
makeAWSAppSyncClient(appSyncClientOptions);
};
};
Then in Client.re
//Client.re
open AWS.AppSyncConfig;
let auth = auth(~type_="API_KEY", ~apiKey="da2-2ajoq2qmsvgspdw6hljfdj2lb4");
let config =
AWS.AppSyncConfig.t(
~url=
"https://h25cvu6lonfilcrryg7xo5fjne.appsync-api.eu-west-1.amazonaws.com/graphql",
~region="eu-west-1",
~auth,
(),
);
let client = AWS.AppSync.createAWSAppSyncClient(config, ());
Sidenote:
The reason I the auth variable is that I cant figure out the syntax for passing directly like this:
...
~auth=auth(~type_="API_KEY", ~apiKey="da2-2ajoq2qmsvgspdw6hljfdj2lb4"),
How do we do that?
End Sidenote
At any rate, running the above produced the following error which I am not understanding what it means and how to fix it:
We've found a bug for you!
/Users/prisc_000/code/APPSYNC/re-aws-events-demo/src/AWS/Client.re 3:24-32
1 │ open AWS.AppSyncConfig;
2 │
3 │ let auth = auth(~type_="API_KEY", ~apiKey="da2-2ajoq2qmsvgspdw6hljfdj2l
b4");
4 │
5 │ let config =
The function applied to this argument has type
AWS.AppSyncConfig.t => AWS.AppSyncConfig.auth
This argument cannot be applied with label ~type_
My understanding is that im defining auth as of type AppSyncConfig.auth which has the ~type_ and ~apiKey properties. So what does it mean that the argument can not be applied with label ~type_?
Thanks for the guidance?
How is this coming along? I am wondering if ~type_ is not a valid field. Maybe it needs to be [@bs.as "type"] type_: string,.
Hello idkjs
I used your bindings from IceCreamSearch and it seems to work.
The only thing is I need to pass a authorization header further down the chain (the graphql api makes a call to a rest API needing the JWT).
Do you have any idea how to pass this JWT from reasonreact through appsync?
Thanks for your work 
I have to think about it a sec. Do you have some code I could look at to get me going in the right direction?