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import Adapter from 'interface/adapter';
import NotFoundError from 'http/error/not-found';
import FieldValue, { PrimitiveValue } from 'type/field-value';
interface NodeCache {
[key: string]: Node;
}
interface AccountIds {
[key: string]: string;
}
class MemoryAdapter implements Adapter {
private cache: NodeCache;
private account_ids: AccountIds;
public constructor() {
this.cache = {};
this.account_ids = {};
}
public async fetchNode(node_key: string): Promise<Node | undefined> {
const cache = this.getCache();
const node = cache[node_key];
return Promise.resolve(node);
}
public storeNode(node_key: string, node: Node): Promise<Node> {
const cache = this.getCache();
cache[node_key] = node;
return Promise.resolve(node);
}
public async setField(
node_key: string,
field_key: string,
value: FieldValue
): Promise<Node> {
const node = await this.fetchNodeUnsafe(node_key);
const updated_node = {
...node,
[field_key]: value
};
return this.storeNode(node_key, updated_node);
}
public async addValueToSet(
node_key: string,
field_key: string,
value: PrimitiveValue
): Promise<Node> {
const node = await this.fetchNodeUnsafe(node_key);
const set_field = this.getArrayField(node, field_key);
if (set_field.includes(value)) {
return Promise.resolve(node);
}
const updated_set = [...set_field, value];
const updated_node = {
...node,
[field_key]: updated_set
};
return this.storeNode(node_key, updated_node);
}
public async removeValueFromSet(
node_key: string,
field_key: string,
value: PrimitiveValue
): Promise<Node> {
const node = await this.fetchNodeUnsafe(node_key);
const set_field = this.getArrayField(node, field_key);
if (!set_field.includes(value)) {
return Promise.resolve(node);
}
const updated_set = set_field.filter((existing_value) => {
return existing_value !== value;
});
const updated_node = {
...node,
[field_key]: updated_set
};
return this.storeNode(node_key, updated_node);
}
public async addValueToList(
node_key: string,
field_key: string,
value: PrimitiveValue,
position?: number
): Promise<Node> {
const node = await this.fetchNodeUnsafe(node_key);
const list_field = this.getArrayField(node, field_key);
if (position === undefined) {
position = list_field.length;
}
const updated_list = [];
const max_index = Math.max(position + 1, list_field.length);
let index = 0;
while (index < max_index) {
if (index === position) {
updated_list.push(value);
}
const current_value = list_field[index];
if (current_value !== undefined) {
updated_list.push(current_value);
} else if (index !== position) {
updated_list.push(null);
}
index++;
}
const updated_node = {
...node,
[field_key]: updated_list
};
return this.storeNode(node_key, updated_node);
}
public async removeValueFromList(
node_key: string,
field_key: string,
value: PrimitiveValue,
position?: number
): Promise<Node> {
const node = await this.fetchNodeUnsafe(node_key);
const list_field = this.getArrayField(node, field_key);
if (position === undefined) {
position = list_field.lastIndexOf(value);
}
if (position === -1) {
return Promise.resolve(node);
}
const target_value = list_field[position];
if (target_value !== value) {
throw new Error(
`Expected to see ${value} at index ${position}, but saw ${target_value}`
);
}
const updated_list = [
...list_field.slice(0, position),
...list_field.slice(position + 1)
];
const updated_node = {
...node,
[field_key]: updated_list
};
return this.storeNode(node_key, updated_node);
}
public fetchAccountId(
username: string,
password: string
): Promise<string | undefined> {
const serialized_credentials = `${username}:${password}`;
const account_ids = this.getAccountIds();
const account_id = account_ids[serialized_credentials];
return Promise.resolve(account_id);
}
public storeAccountId(
username: string,
password: string,
account_id: string
): Promise<void> {
const serialized_credentials = `${username}:${password}`;
const account_ids = this.getAccountIds();
account_ids[serialized_credentials] = account_id;
return Promise.resolve();
}
private async fetchNodeUnsafe(node_key: string): Promise<Node> {
const node = await this.fetchNode(node_key);
if (node === undefined) {
throw new NotFoundError();
}
return node;
}
private getArrayField(node: Node, field_key: string): PrimitiveValue[] {
const field = node[field_key];
if (field === undefined) {
throw new Error(`Unable to find field for key: ${field_key}`);
}
if (!Array.isArray(field)) {
throw new Error(`Field key ${field_key} did not point to an array`);
}
return field as PrimitiveValue[];
}
private getCache(): NodeCache {
return this.cache;
}
private getAccountIds(): AccountIds {
return this.account_ids;
}
}
export default MemoryAdapter;
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