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import { Message, Model, Part, Session, SnapshotFileDiff } from "@opencode-ai/sdk/v2"
import { fn } from "@opencode-ai/core/util/fn"
import { iife } from "@opencode-ai/core/util/iife"
import z from "zod"
import { Storage } from "./storage"
export namespace Share {
export const Info = z.object({
id: z.string(),
secret: z.string(),
sessionID: z.string(),
})
export type Info = z.infer<typeof Info>
export const Data = z.discriminatedUnion("type", [
z.object({
type: z.literal("session"),
data: z.custom<Session>(),
}),
z.object({
type: z.literal("message"),
data: z.custom<Message>(),
}),
z.object({
type: z.literal("part"),
data: z.custom<Part>(),
}),
z.object({
type: z.literal("session_diff"),
data: z.custom<SnapshotFileDiff[]>(),
}),
z.object({
type: z.literal("model"),
data: z.custom<Model[]>(),
}),
])
export type Data = z.infer<typeof Data>
type Snapshot = {
data: Data[]
}
type Compaction = {
event?: string
data: Data[]
}
function key(item: Data) {
switch (item.type) {
case "session":
return "session"
case "message":
return `message/${item.data.id}`
case "part":
return `part/${item.data.messageID}/${item.data.id}`
case "session_diff":
return "session_diff"
case "model":
return "model"
}
}
function merge(...items: Data[][]) {
const map = new Map<string, Data>()
for (const list of items) {
for (const item of list) {
map.set(key(item), item)
}
}
return Array.from(map.entries())
.sort(([a], [b]) => a.localeCompare(b))
.map(([, item]) => item)
}
async function readSnapshot(shareID: string) {
return (await Storage.read<Snapshot>(["share_snapshot", shareID]))?.data
}
async function writeSnapshot(shareID: string, data: Data[]) {
await Storage.write<Snapshot>(["share_snapshot", shareID], { data })
}
async function legacy(shareID: string) {
const compaction: Compaction = (await Storage.read<Compaction>(["share_compaction", shareID])) ?? {
data: [],
event: undefined,
}
const list = await Storage.list({
prefix: ["share_event", shareID],
before: compaction.event,
}).then((x) => x.toReversed())
if (list.length === 0) {
if (compaction.data.length > 0) await writeSnapshot(shareID, compaction.data)
return compaction.data
}
const next = merge(
compaction.data,
await Promise.all(list.map(async (event) => await Storage.read<Data[]>(event))).then((x) =>
x.flatMap((item) => item ?? []),
),
)
await Promise.all([
Storage.write(["share_compaction", shareID], {
event: list.at(-1)?.at(-1),
data: next,
}),
writeSnapshot(shareID, next),
])
return next
}
export const create = fn(z.object({ sessionID: z.string() }), async (body) => {
const isTest = process.env.NODE_ENV === "test" || body.sessionID.startsWith("test_")
const info: Info = {
id: (isTest ? "test_" : "") + body.sessionID.slice(-8),
sessionID: body.sessionID,
secret: crypto.randomUUID(),
}
const exists = await get(info.id)
if (exists) throw new Errors.AlreadyExists(info.id)
await Promise.all([Storage.write(["share", info.id], info), writeSnapshot(info.id, [])])
return info
})
export async function get(id: string) {
return Storage.read<Info>(["share", id])
}
export const remove = fn(Info.pick({ id: true, secret: true }), async (body) => {
const share = await get(body.id)
if (!share) throw new Errors.NotFound(body.id)
if (share.secret !== body.secret) throw new Errors.InvalidSecret(body.id)
await Storage.remove(["share", body.id])
const groups = await Promise.all([
Storage.list({ prefix: ["share_snapshot", body.id] }),
Storage.list({ prefix: ["share_compaction", body.id] }),
Storage.list({ prefix: ["share_event", body.id] }),
Storage.list({ prefix: ["share_data", body.id] }),
])
for (const item of groups.flat()) {
await Storage.remove(item)
}
})
export const sync = fn(
z.object({
share: Info.pick({ id: true, secret: true }),
data: Data.array(),
}),
async (input) => {
const share = await get(input.share.id)
if (!share) throw new Errors.NotFound(input.share.id)
if (share.secret !== input.share.secret) throw new Errors.InvalidSecret(input.share.id)
const data = (await readSnapshot(input.share.id)) ?? (await legacy(input.share.id))
await writeSnapshot(input.share.id, merge(data, input.data))
},
)
export async function data(shareID: string) {
return (await readSnapshot(shareID)) ?? legacy(shareID)
}
export const syncOld = fn(
z.object({
share: Info.pick({ id: true, secret: true }),
data: Data.array(),
}),
async (input) => {
const share = await get(input.share.id)
if (!share) throw new Errors.NotFound(input.share.id)
if (share.secret !== input.share.secret) throw new Errors.InvalidSecret(input.share.id)
const promises = []
for (const item of input.data) {
promises.push(
iife(async () => {
switch (item.type) {
case "session":
await Storage.write(["share_data", input.share.id, "session"], item.data)
break
case "message": {
const data = item.data as Message
await Storage.write(["share_data", input.share.id, "message", data.id], item.data)
break
}
case "part": {
const data = item.data as Part
await Storage.write(["share_data", input.share.id, "part", data.messageID, data.id], item.data)
break
}
case "session_diff":
await Storage.write(["share_data", input.share.id, "session_diff"], item.data)
break
case "model":
await Storage.write(["share_data", input.share.id, "model"], item.data)
break
}
}),
)
}
await Promise.all(promises)
},
)
export const Errors = {
NotFound: class extends Error {
constructor(public id: string) {
super(`Share not found: ${id}`)
}
},
InvalidSecret: class extends Error {
constructor(public id: string) {
super(`Share secret invalid: ${id}`)
}
},
AlreadyExists: class extends Error {
constructor(public id: string) {
super(`Share already exists: ${id}`)
}
},
}
}
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