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| Canidynamo = function(Cani, AWS){ return (function(dynamo){
// expect schemas in conf.dynamo to map saves/loads, set indices, confirm permissions properly
var schemas = [];
dynamo.schemas = schemas;
// grab these off the conf object
var tables = [];
dynamo.tables = tables;
var dy; // aws dynamo singleton
var dyconf;
// ------------------------------- config -------------------------------------
var DYCONF = function(conf, provider){
dyconf = conf;
schemas = conf.dynamo.schemas;
Eif('initOn' in conf.dynamo)
conf.dynamo.initOn.map(function(pr){Cani.core.confirm(pr).then(dynamo.init);});
};
// dynamo boot hook
Cani.core.on('config: dynamo', DYCONF);
dynamo.init = function(configPack){
dy = new AWS.DynamoDB(configPack||dyconf.dynamo.awsConfigPack);
dy.listTables(function(err, data){
// maybe parse the meaningless aws error messages?
Iif(err) console.log(err);
dynamo.tables = data.TableNames;
Cani.core.affirm('dynamo', dynamo);
// affirm dy.table foreach table
for(var i=dynamo.tables.length;i-->0;) Cani.core.affirm('dynamo.'+dynamo.tables[i],dynamo);
});
};
// expose save and load functions
// these names need to be fixed to the standard api
//------------------------------------------------------------------------------------------
dynamo.write = function(type){
// in cases where default options are non-EQ queries
return '';
};
//------------------------------------------------------------------------------------------
dynamo.save = function(schemaName, query){
Iif(typeof query === 'undefined') query = {};
query = JSON.parse(JSON.stringify(query));
var deferred = Q.defer(); // deferred.reject to do an error
var schema = schemas[schemaName];
// load the query into an AWS Item pack
var pack = {};
var tableName = schema.table.arn.split('/')[1]; // MIGHT FUCK UP
for(var ff in query){
Iif(query[ff] === '') continue; // no blank strings allowed
Iif(query[ff] === null) continue; // typeof null == 'object'
Iif(ff[0] === '$') continue; // don't write angular fields. also fuck php?
Eif(ff in schema.fields){
// if in schema write to pack with type
pack[ff] = {};
if(schema.fields[ff] === 'N') query[ff] = ''+query[ff];
pack[ff][schema.fields[ff]] = query[ff];
}else{
// do the old style type guessing
var type = dynamoType(query[ff]);
if(type === 'U') continue; // shouldn't happen though
if(type === 'B') type = 'BOOL';
pack[ff] = {};
if(type === 'N') query[ff] = ''+query[ff]; // pass numbers as strings? psh
if(type === 'L'){
// mashu?
}
if(type === 'M'){
// make query[ff] into a map of {"S":"value"} structures?
for(var ii in query[ff]){
var ss = {};
var tt = dynamoType(query[ff][ii]);
if(tt === 'BOOL') ss[tt] = query[ff][ii];
else ss[tt] = ''+query[ff][ii];
query[ff][ii] = ss;
}
}
pack[ff][type] = query[ff];
}
}
// replace this with a stupid USE TABLE FROM SCHEMA system
// maybe check that we have the keys for this index? meh
dy.putItem({TableName:tableName, Item:pack}, function(err, res){
Iif(err){
console.log(err);
// parse aws error msg
deferred.reject(err);
}
deferred.resolve(query);
});
return deferred.promise;
};
//------------------------------------------------------------------------------------------
dynamo.load = function(schemaName, query, options){
var def = Q.defer();
Eif(!options) options = {};
Iif(!query) query = {};
// this doesn't implement options.FilterExpression IndexName Limit
// ProjectionExpression or ScanIndexForward
// or options.Select (count, attribute listables)
// or streams, or RXjs
var schema = schemas[schemaName];
var table = schema.table;
var tableName = table.arn.split('/')[1];
var indexName = options.index;
Iif(indexName)
if(table.indices.indexOf(indexName) === -1)
throw 'index '+indexName+' not available';
Iif(dynamo.tables.indexOf(tableName) === -1) throw 'table '+tableName+' not available';
var pack = {};
pack.TableName = tableName;
// pack.IndexName left empty for default?
// string build a KeyConditionExpression
var hashAtt = table.hashKey;
Iif((table.reservedAttributes||[]).indexOf(table.hashKey)>-1){
pack.ExpressionAttributeNames = {};
pack.ExpressionAttributeNames['#bsd'+table.hashKey] = table.hashKey;
hashAtt = '#bsd'+table.hashKey;
}
// start withe hashKey (ALWAYS EXACT QUERYING)
Iif(!(table.hashKey in query)) throw 'query needs a hashkey ('+table.hashKey+') expression';
pack.KeyConditionExpression = hashAtt + ' = :' + table.hashKey;
// this prev evals the :table.hashKey to the ExpressionAttributeValue next, to check equality
// this dynamoType I think is always S or N?
pack.ExpressionAttributeValues = {};
pack.ExpressionAttributeValues[':'+table.hashKey] = {};
pack.ExpressionAttributeValues[':'+table.hashKey][dynamoType(query[table.hashKey])] =
''+query[table.hashKey];
// now build KeyConditionExpression for the rest of the query
for(var ff in query){
Eif(ff === table.hashKey) continue;
var type = (typeof query[ff])[0].toUpperCase(); // don't change this to dynamoType!
var cOp = '=';
// querying arrays? later
// remember to implement this comparison operator validation!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
if((type === 'O') && ('is an actual comparison operator query')){
cOp = Object.keys(query[ff])[0];
type = dynamoType(query[ff][cOp]);
query[ff] = query[ff][cOp];
// the idea here is to operate as {eq:'value'} or whatever
/*In addition to the usual Boolean comparison operators, you can also use CONTAINS, NOT_CONTAINS, and BEGINS_WITH for string matching, BETWEEN for range checking, and IN to check for membership in a set.
In addition to the QueryFilter, you can also supply a ConditionalOperator. This logical operator (either AND or OR) is used to connect each of the elements in the QueryFilter.
https://aws.amazon.com/blogs/aws/improved-queries-and-updates-for-dynamodb/
*/
}else if(['S','N'].indexOf(type) === -1) continue;
var att = ff;
if((table.reservedAttributes||[]).indexOf(ff)>-1){
pack.ExpressionAttributeNames = pack.ExpressionAttributeNames||{};
pack.ExpressionAttributeNames['#bsd'+ff] = ff;
att = '#bsd'+ff;
}
var expr;
if(cOp !== 'begins_with') expr = att+' '+cOp+' :'+ff;
else expr = 'begins_with('+att+', :'+ff+')';
pack.ExpressionAttributeValues[':'+ff] = {};
pack.ExpressionAttributeValues[':'+ff][type] = ''+query[ff];
if(query[ff] !== '')
pack.KeyConditionExpression += ' and '+expr;
}
// that shit is ugly like a penguin's anus at feeding time!
dy.query(pack, function(err, res){
// implement LastEvaluatedKey element large reads
//defer promise
Iif(err){
console.log(err);
def.reject(err);
}
//unpack the response
var pon = [];
for(var i=0; i<res.Items.length; ++i){
var itm = {};
for(var ff in res.Items[i])
itm[ff] = deref(res.Items[i][ff], Object.keys(res.Items[i][ff])[0]);
pon.push(itm);
}
def.resolve(pon);
});
return def.promise;
};
//------------------------------------------------------------------------------------------
dynamo.erase = function(schemaName, query){
// make a deleteItem request to the table determined by schema
// basically I'm going to require that you have the tableName, hash and range.
// feel free to send me a collection of hash-range (maybe batch delete later)?
var schema = schemas[schemaName];
// autofill table for schemas with only one table
var tableName = schema.table.split('/')[1];
var pack = {
Key: {},
ReturnValues: "ALL_OLD",
TableName: tableName
};
var table = schema.tables[tableName];
var hash = table.hashKey;
var range = table.rangeKey;
pack.Key[hash] = {};
pack.Key[range] = {};
pack.Key[hash][schema.fields[hash]] = pack.Key[hash][schema.fields[hash]] || query[hash];
pack.Key[range][schema.fields[range]] = pack.Key[range][schema.fields[range]] || query[range];
var deferred = Q.defer();
dy.deleteItem(pack, function(err, res){
deferred.resolve(res);
});
return deferred.promise;
};
return dynamo;
function dynamoType(vv){
var t = (typeof vv)[0].toUpperCase();
Iif(t==='B') return 'BOOL'; // this isn't implementing BS (Binary Set) Or NULL typed
else Eif(t!=='O') return t;
if(vv.constructor == Array){
var atype = (typeof vv[0])[0].toUpperCase();
// this is a biscuit. LEARN FROM THIS CODE MOOCHES!
for(var i=1; i<vv.length; ++i)
if((atype = (atype!==(typeof vv[i])[0].toUpperCase())||atype) ===true)
break;
if(atype === true) return 'L'; // can only save as dynamo List
else{
// also here need to check the array for duplicates
// do lists need that check?
return atype + 'S'; // can save as a dynamo array.
}
}else return 'M';
}
function deref(vv, type){
switch(type){
case 'L': return vv;
case'M':
for(var kk in vv.M){
vv.M[kk] = deref(vv.M[kk], Object.keys(vv.M[kk])[0]);
}
return vv.M;
case 'N':
return parseInt(vv[type]);
default:
return vv[type];
}
}
});};
Eif(typeof require === 'function'){
module.exports = Canidynamo;
}else Cani.dynamo = Canidynamo(Cani, AWS)(Cani.dynamo||{});
// this shit works in the browser AND node. I promise!
// but does it work through webpack? no.
// the way to get around that is to make an index.js file to import in webpack
// wherein we export default function(Cani, dep){}
// this task requires going into ALL the modules to rework them for multi-env
// core, google, storage, dynamo, s3, firebase
// later: fb, google, cognito, phonegap+fb, in-the-works
// need to set up for
// es5 (all done) node (dynamo done) and webpack ()
// can just import the files
// but this uses the global scope
// am I enough of an asshole to just tell ppl to use the global scope?
// am I good enough to reserve space on the global browser this?
// yes. I am that awesome. Fuck you.
// should Cani simply run in a web-worker? maybe.
|