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Add async mode to evaluateJSONataExpression

This commit is contained in:
Nick O'Leary 2018-07-09 15:12:09 +01:00
parent d7adff9a65
commit b2f06b6777
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GPG Key ID: 4F2157149161A6C9
2 changed files with 55 additions and 2 deletions
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33
red/runtime/util.js
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@ -394,15 +394,44 @@ function prepareJSONataExpression(value,node) {
})
expr.registerFunction('clone', cloneMessage, '<(oa)-:o>');
expr._legacyMode = /(^|[^a-zA-Z0-9_'"])msg([^a-zA-Z0-9_'"]|$)/.test(value);
expr._node = node;
return expr;
}
function evaluateJSONataExpression(expr,msg) {
function evaluateJSONataExpression(expr,msg,callback) {
var context = msg;
if (expr._legacyMode) {
context = {msg:msg};
}
return expr.evaluate(context);
var bindings = {};
if (callback) {
// If callback provided, need to override the pre-assigned sync
// context functions to be their async variants
bindings.flowContext = function(val) {
return new Promise((resolve,reject) => {
expr._node.context().flow.get(val, function(err,value) {
if (err) {
reject(err);
} else {
resolve(value);
}
})
});
}
bindings.globalContext = function(val) {
return new Promise((resolve,reject) => {
expr._node.context().global.get(val, function(err,value) {
if (err) {
reject(err);
} else {
resolve(value);
}
})
});
}
}
return expr.evaluate(context, bindings, callback);
}

24
test/red/runtime/util_spec.js
View File

@ -458,6 +458,30 @@ describe("red/util", function() {
var result = util.evaluateJSONataExpression(expr,{payload:"hello"});
should.not.exist(result);
});
it('handles async flow context access', function(done) {
var expr = util.prepareJSONataExpression('$flowContext("foo")',{context:function() { return {flow:{get: function(key,callback) { setTimeout(()=>{callback(null,{'foo':'bar'}[key])},10)}}}}});
util.evaluateJSONataExpression(expr,{payload:"hello"},function(err,value) {
try {
should.not.exist(err);
value.should.eql("bar");
done();
} catch(err2) {
done(err2);
}
});
})
it('handles async global context access', function(done) {
var expr = util.prepareJSONataExpression('$globalContext("foo")',{context:function() { return {global:{get: function(key,callback) { setTimeout(()=>{callback(null,{'foo':'bar'}[key])},10)}}}}});
util.evaluateJSONataExpression(expr,{payload:"hello"},function(err,value) {
try {
should.not.exist(err);
value.should.eql("bar");
done();
} catch(err2) {
done(err2);
}
});
})
});