-
Notifications
You must be signed in to change notification settings - Fork 28
/
normalizeResponse.js
161 lines (149 loc) · 6.46 KB
/
normalizeResponse.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
import mergeStores from './mergeStores';
import separateArgs from './separateArgs';
import {getSubReqAST} from './getSubReqAST';
import {
ensureRootType,
CACHED,
getRegularArgsKey,
isObject,
getFieldSchema,
NORM_DELIMITER,
FULL,
FRONT,
BACK,
TYPENAME,
getVariableValue,
parseCachedType
} from '../utils';
import {VARIABLE} from 'graphql/language/kinds';
import {TypeKind} from 'graphql/type/introspection';
const {UNION} = TypeKind;
const mapResponseToResult = (nestedResult, response, fieldSchema, reqASTArgs, context) => {
if (!fieldSchema.args) return response;
const {paginationWords, variables} = context;
const {regularArgs, paginationArgs} = separateArgs(fieldSchema, reqASTArgs, paginationWords, variables);
if (paginationArgs) {
const {first, last} = paginationArgs;
const arrName = first !== undefined ? FRONT : last !== undefined ? BACK : FULL;
response = {[arrName]: response};
}
if (regularArgs === false) {
return response;
} else {
const regularArgsString = getRegularArgsKey(regularArgs);
const resultObj = {[regularArgsString]: response};
return (isObject(nestedResult) && !Array.isArray(nestedResult)) ? mergeStores(nestedResult, resultObj) : resultObj;
}
};
const visitObject = (bag, subResponse, reqAST, subSchema, context) => {
const keys = Object.keys(subResponse);
const reduction = {};
const typenameField = reqAST && reqAST.selectionSet.selections.find(field => field.name.value === TYPENAME);
const typenameAlias = typenameField && typenameField.alias && typenameField.alias.value || TYPENAME;
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
if (key === typenameAlias) continue;
if (reqAST) {
const subReqAST = getSubReqAST(key, reqAST, subResponse[typenameAlias]);
const name = subReqAST.name.value;
const cachedDirective = subReqAST.directives.find(d => d.name.value === CACHED);
if (cachedDirective) {
const typeArg = cachedDirective.arguments.find(arg => arg.name.value === 'type');
const typeName = getVariableValue(typeArg, context.variables);
const {type} = parseCachedType(typeName);
const typeSchema = context.schema.types[type];
visit(bag, subResponse[key], subReqAST, typeSchema, context);
} else {
const fieldSchema = getFieldSchema(subReqAST, subSchema, context.schema);
const fieldType = ensureRootType(fieldSchema.type);
// handle first recursion where things are stored in the query (sloppy)
const typeSchema = context.schema.types[fieldType.name] || subSchema.types[fieldType.name];
const normalizedResponse = visit(bag, subResponse[key], subReqAST, typeSchema, context);
reduction[name] = mapResponseToResult(reduction[name], normalizedResponse, fieldSchema, subReqAST.arguments, context);
}
} else {
// this is for subscriptions, since we don't explicitly have a request AST
const fieldSchema = subSchema.fields[key];
const fieldType = ensureRootType(fieldSchema.type);
const typeSchema = context.schema.types[fieldType.name];
reduction[key] = visit(bag, subResponse[key], undefined, typeSchema, context);
}
}
return reduction;
};
const visitEntity = (bag, subResponse, reqAST, subSchema, context, id) => {
const entityKey = subSchema.name;
bag[entityKey] = bag[entityKey] || {};
bag[entityKey][id] = bag[entityKey][id] || {};
let normalized = visitObject(bag, subResponse, reqAST, subSchema, context);
bag[entityKey][id] = mergeStores(bag[entityKey][id], normalized);
return `${entityKey}${NORM_DELIMITER}${id}`;
};
const visitIterable = (bag, subResponse, reqAST, subSchema, context) => {
const normalizedSubResponse = subResponse.map(res => visit(bag, res, reqAST, subSchema, context));
if (reqAST && reqAST.arguments && reqAST.arguments.length) {
const {first, last} = context.paginationWords;
const paginationFlags = [{word: first, flag: 'EOF'}, {word: last, flag: 'BOF'}];
for (let i = 0; i < paginationFlags.length; i++) {
const {word, flag} = paginationFlags[i];
const count = reqAST.arguments.find(arg => arg.name.value === word);
// allow count === 0
if (count !== undefined) {
let countVal;
if (count.value.kind === VARIABLE) {
const variableDefName = count.value.name.value;
countVal = +context.variables[variableDefName];
// pass the count onto the normalized response to perform a slice during the state merge
normalizedSubResponse.count = subResponse.count;
// MUTATES CONTEXT VARIABLES. update the difference in the variables (passed on to redux state)
context.variables[variableDefName] = subResponse.length;
// MUTATES ORIGINAL DENORMALIZED RESPONSE. kinda ugly, but saves an additional tree walk.
subResponse.count = subResponse.length;
} else {
countVal = +count.value.value;
}
if (normalizedSubResponse.length < countVal) {
normalizedSubResponse[flag] = true;
}
break;
}
}
}
return normalizedSubResponse
};
const visitUnion = (bag, subResponse, reqAST, subSchema, context) => {
const typenameField = reqAST.selectionSet.selections.find(field => field.name.value === TYPENAME);
const typenameAlias = typenameField.alias && typenameField.alias.value || TYPENAME;
const concreteSubScema = context.schema.types[subResponse[typenameAlias]];
return visit(bag, subResponse, reqAST, concreteSubScema, context);
};
const visit = (bag, subResponse, reqAST, subSchema, context) => {
if (!isObject(subResponse) || subResponse instanceof Date) {
return subResponse;
}
if (Array.isArray(subResponse)) {
return visitIterable(bag, subResponse, reqAST, subSchema, context);
}
if (subSchema.kind === UNION) {
return visitUnion(bag, subResponse, reqAST, subSchema, context);
}
const {idFieldName} = context;
if (subSchema.fields[idFieldName]) {
const id = subResponse[idFieldName];
return visitEntity(bag, subResponse, reqAST, subSchema, context, id);
}
return visitObject(bag, subResponse, reqAST, subSchema, context);
};
export default (response, context, isSubscription) => {
const entities = {};
let result;
if (isSubscription) {
result = visitEntity(entities, response, null, context.typeSchema, context, response[context.idFieldName]);
} else {
result = visitObject(entities, response, context.operation, context.schema.querySchema, context);
}
return {
entities,
result
};
};