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Backend.ts
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Backend.ts
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import * as cryptly from "cryptly"
import * as isoly from "isoly"
import * as cosmos from "@cfworker/cosmos"
import { check } from "./checkDate"
import { Document } from "./Document"
export class Backend<T> {
constructor(private client: cosmos.CosmosClient) {}
async get(document: { key: cryptly.Identifier; shard: string }): Promise<Document<T> | undefined> {
return this.fromResponse(
await this.client.getDocument<Document<T> & cosmos.Document>({
docId: document.key,
partitionKey: document.shard,
})
)
}
async create(document: { key: cryptly.Identifier; shard: string; value: T; lock?: string }) {
const response = await this.client.createDocument<Document<T> & cosmos.Document>({
partitionKey: document.shard,
document: {
id: document.key,
shard: document.shard,
value: document.value,
lock: document.lock,
} as cosmos.Resource,
})
return this.fromResponse(response)
}
async set(document: {
key: cryptly.Identifier
shard: string
value: T
lock?: string
}): Promise<Document<T> | undefined> {
return this.fromResponse(
await this.client.createDocument<Document<T> & cosmos.Document>({
partitionKey: document.shard,
document: {
id: document.key,
shard: document.shard,
value: document.value,
lock: document.lock,
} as cosmos.Resource,
isUpsert: true,
})
)
}
async list(
document: { shard: string },
start?: isoly.Date | isoly.DateTime,
end?: isoly.Date | isoly.DateTime,
limit?: number,
continuation?: string,
timeProperty = "created"
): Promise<{ data: Document<T>[]; continuation?: string } | undefined> {
;({ start, end } = check(start, end))
const result: Document<T>[] = []
let response: cosmos.FeedResponse<Document<T> & cosmos.Document> | undefined
const parameters = [
...(start ? [{ name: "@start", value: start, operator: ">=" }] : []),
...(end ? [{ name: "@end", value: end, operator: "<=" }] : []),
]
const query = `SELECT * FROM ROOT a ${
parameters.length
? `WHERE ${parameters.map(c => `a["value"]["${timeProperty}"] ${c.operator} ${c.name}`).join(" AND ")} `
: ""
}ORDER BY a["value"]["${timeProperty}"] DESC`
do {
response = response?.hasNext
? await response?.next()
: await this.client.queryDocuments<Document<T> & cosmos.Document>({
partitionKey: document.shard,
maxItems: limit ?? -1,
continuation,
query,
parameters,
})
result.push(
...((await response.json()) ?? []).map(r => {
return {
key: r.id,
shard: r.shard,
value: r.value,
lock: r.lock,
eTag: JSON.parse(r?._etag),
}
})
)
} while (response.hasNext && !limit && !continuation)
const continuationToken = response.headers.get("x-ms-continuation") || undefined
return result.length == 0 && continuation ? undefined : { data: result, continuation: continuationToken }
}
async replace(document: Document<T>): Promise<Document<T> | undefined> {
return this.fromResponse(
await this.client.replaceDocument<Document<T> & cosmos.Document>({
docId: document.key,
partitionKey: document.shard,
document: {
id: document.key,
shard: document.shard,
value: document.value,
lock: document.lock,
} as cosmos.Resource,
ifMatch: document.eTag,
})
)
}
async delete(document: { key: cryptly.Identifier; shard: string; eTag?: string }): Promise<boolean> {
const response = await this.client.deleteDocument({
docId: document.key,
partitionKey: document.shard,
ifMatch: document.eTag,
})
return response.ok
}
private async fromResponse(
response: cosmos.ItemResponse<Document<T> & cosmos.Document>
): Promise<Document<T> | undefined> {
if (response.status >= 400)
console.log("Transactly Error", response, await response.json())
const result = response.status < 400 ? await response.json() : undefined
return (
result && {
key: result.id,
shard: result.shard,
value: result.value,
lock: result.lock,
eTag: JSON.parse(result?._etag),
}
)
}
static async connect<T>(url: string, secret: string, database: string, collection: string): Promise<Backend<T>> {
const client = new cosmos.CosmosClient({
endpoint: url,
masterKey: secret,
consistencyLevel: "Eventual",
dbId: database,
collId: collection,
})
return new Backend<T>(client)
}
}