browsercode/packages/opencode/src/session/processor.ts at main · code2labgit/browsercode · GitHub

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import { LayerNode } from "@opencode-ai/core/effect/layer-node"

import { PermissionV1 } from "@opencode-ai/core/v1/permission"

import { Image } from "@/image/image"

import { SessionV1 } from "@opencode-ai/core/v1/session"

import { Cause, Deferred, Effect, Exit, Layer, Context, Scope, Schema } from "effect"

import * as Option from "effect/Option"

import * as Stream from "effect/Stream"

import { Agent } from "@/agent/agent"

import { Config } from "@/config/config"

import { Permission } from "@/permission"

import { Plugin } from "@/plugin"

import { Snapshot } from "@/snapshot"

import { Session } from "./session"

import { LLM } from "./llm"

import { MessageV2 } from "./message-v2"

import { isOverflow } from "./overflow"

import { PartID } from "./schema"

import type { SessionID } from "./schema"

import { SessionRetry } from "./retry"

import { SessionStatus } from "./status"

import { SessionSummary } from "./summary"

import type { Provider } from "@/provider/provider"

import { Question } from "@/question"

import { errorMessage } from "@/util/error"

import { isRecord } from "@/util/record"

import { EventV2Bridge } from "@/event-v2-bridge"

import { Database } from "@opencode-ai/core/database/database"

import { Usage, type LLMEvent } from "@opencode-ai/llm"

const DOOM_LOOP_THRESHOLD = 3

function omittedImagesMessage(failures: ReadonlyArray<Image.Error | undefined>) {

const groups = failures.reduce<Map<string, number>>((acc, error) => {

const reason = (() => {

switch (error?._tag) {

case "ImageResizerUnavailableError":

return "image processor unavailable in this runtime"

case "ImageInvalidDataUrlError":

return "attachment URL malformed"

case "ImageDecodeError":

return "could not decode image data"

case "ImageSizeError":

return "could not be resized below the inline image size limit"

default:

return "unknown error"

}

})()

return acc.set(reason, (acc.get(reason) ?? 0) + 1)

}, new Map())

return Array.from(groups.entries())

.map(([reason, count]) => `[${count} image${count === 1 ? "" : "s"} omitted: ${reason}.]`)

.join("\n")

}

export type Result = "compact" | "stop" | "continue"

export interface Handle {

readonly message: SessionV1.Assistant

readonly updateToolCall: (

toolCallID: string,

update: (part: SessionV1.ToolPart) => SessionV1.ToolPart,

) => Effect.Effect<SessionV1.ToolPart | undefined>

readonly completeToolCall: (

toolCallID: string,

output: {

title: string

metadata: Record<string, any>

output: string

attachments?: SessionV1.FilePart[]

) => Effect.Effect<void>

readonly process: (streamInput: LLM.StreamInput) => Effect.Effect<Result>

}

type Input = {

assistantMessage: SessionV1.Assistant

sessionID: SessionID

model: Provider.Model

}

export interface Interface {

readonly create: (input: Input) => Effect.Effect<Handle>

}

type ToolCall = {

partID: SessionV1.ToolPart["id"]

messageID: SessionV1.ToolPart["messageID"]

sessionID: SessionV1.ToolPart["sessionID"]

done: Deferred.Deferred<void>

}

interface ProcessorContext extends Input {

toolcalls: Record<string, ToolCall>

shouldBreak: boolean

snapshot: string | undefined

blocked: boolean

needsCompaction: boolean

currentText: SessionV1.TextPart | undefined

reasoningMap: Record<string, SessionV1.ReasoningPart>

outputLimitUsage: Pick<SessionV1.StepFinishPart, "cost" | "tokens"> | undefined

}

type StreamEvent = LLMEvent

export class Service extends Context.Service<Service, Interface>()("@opencode/SessionProcessor") {}

const layer = Layer.effect(

Service,

Effect.gen(function* () {

const session = yield* Session.Service

const config = yield* Config.Service

const snapshot = yield* Snapshot.Service

const agents = yield* Agent.Service

const llm = yield* LLM.Service

const permission = yield* Permission.Service

const plugin = yield* Plugin.Service

const summary = yield* SessionSummary.Service

const scope = yield* Scope.Scope

const status = yield* SessionStatus.Service

const image = yield* Image.Service

const events = yield* EventV2Bridge.Service

const database = yield* Database.Service

const create = Effect.fn("SessionProcessor.create")(function* (input: Input) {

// Pre-capture snapshot before the LLM stream starts. The AI SDK

// may execute tools internally before emitting start-step events,

// so capturing inside the event handler can be too late.

const initialSnapshot = yield* snapshot.track()

const ctx: ProcessorContext = {

assistantMessage: input.assistantMessage,

sessionID: input.sessionID,

model: input.model,

toolcalls: {},

shouldBreak: false,

snapshot: initialSnapshot,

blocked: false,

needsCompaction: false,

currentText: undefined,

reasoningMap: {},

outputLimitUsage: undefined,

}

let aborted = false

const parse = (e: unknown) =>

MessageV2.fromError(e, {

providerID: input.model.providerID,

aborted,

})

const settleToolCall = Effect.fn("SessionProcessor.settleToolCall")(function* (toolCallID: string) {

const done = ctx.toolcalls[toolCallID]?.done

delete ctx.toolcalls[toolCallID]

if (done) yield* Deferred.succeed(done, undefined).pipe(Effect.ignore)

})

const readToolCall = Effect.fn("SessionProcessor.readToolCall")(function* (toolCallID: string) {

const call = ctx.toolcalls[toolCallID]

if (!call) return undefined

const part = yield* session.getPart({

partID: call.partID,

messageID: call.messageID,

sessionID: call.sessionID,

})

if (!part || part.type !== "tool") {

delete ctx.toolcalls[toolCallID]

return undefined

}

return { call, part }

})

const resetOutputLimit = Effect.fn("SessionProcessor.resetOutputLimit")(function* () {

const parts = yield* MessageV2.parts(ctx.assistantMessage.id).pipe(

Effect.provideService(Database.Service, database),

)

// Replace the streamed attempt before resampling the unchanged request.

// Its usage is carried into the next step-finish part.

yield* Effect.forEach(

parts,

(part) =>

session.removePart({

sessionID: part.sessionID,

messageID: part.messageID,

partID: part.id,

}),

{ concurrency: "unbounded" },

)

ctx.assistantMessage.finish = undefined

yield* session.updateMessage(ctx.assistantMessage)

})

const updateToolCall = Effect.fn("SessionProcessor.updateToolCall")(function* (

toolCallID: string,

update: (part: SessionV1.ToolPart) => SessionV1.ToolPart,

) {

const match = yield* readToolCall(toolCallID)

if (!match) return undefined

const part = yield* session.updatePart(update(match.part))

ctx.toolcalls[toolCallID] = {

...match.call,

partID: part.id,

messageID: part.messageID,

sessionID: part.sessionID,

}

return part

})

const completeToolCall = Effect.fn("SessionProcessor.completeToolCall")(function* (

toolCallID: string,

output: {

title: string

metadata: Record<string, any>

output: string

attachments?: SessionV1.FilePart[]

) {

const match = yield* readToolCall(toolCallID)

if (!match || match.part.state.status !== "running") return

yield* session.updatePart({

...match.part,

state: {

status: "completed",

input: match.part.state.input,

output: output.output,

metadata: output.metadata,

title: output.title,

time: { start: match.part.state.time.start, end: Date.now() },

attachments: output.attachments,

})

yield* settleToolCall(toolCallID)

})

const failToolCall = Effect.fn("SessionProcessor.failToolCall")(function* (toolCallID: string, error: unknown) {

const match = yield* readToolCall(toolCallID)

if (!match || match.part.state.status !== "running") return false

yield* session.updatePart({

...match.part,

state: {

status: "error",

input: match.part.state.input,

error: errorMessage(error),

// Keep metadata streamed while running so failures retain progress detail (e.g. execute's child calls).

metadata: match.part.state.metadata,

time: { start: match.part.state.time.start, end: Date.now() },

})

if (error instanceof PermissionV1.RejectedError || error instanceof Question.RejectedError) {

ctx.blocked = ctx.shouldBreak

}

yield* settleToolCall(toolCallID)

return true

})

const finishReasoning = Effect.fn("SessionProcessor.finishReasoning")(function* (reasoningID: string) {

if (!(reasoningID in ctx.reasoningMap)) return

// oxlint-disable-next-line no-self-assign -- reactivity trigger

ctx.reasoningMap[reasoningID].text = ctx.reasoningMap[reasoningID].text

ctx.reasoningMap[reasoningID].time = { ...ctx.reasoningMap[reasoningID].time, end: Date.now() }

yield* session.updatePart(ctx.reasoningMap[reasoningID])

delete ctx.reasoningMap[reasoningID]

})

const ensureToolCall = Effect.fn("SessionProcessor.ensureToolCall")(function* (input: {

id: string

name: string

providerExecuted?: boolean

}) {

const existing = yield* readToolCall(input.id)

if (existing) {

if (!input.providerExecuted || existing.part.metadata?.providerExecuted) return existing

const part = yield* session.updatePart({

...existing.part,

metadata: { ...existing.part.metadata, providerExecuted: true },

})

ctx.toolcalls[input.id] = {

...existing.call,

partID: part.id,

messageID: part.messageID,

sessionID: part.sessionID,

}

return { call: ctx.toolcalls[input.id], part }

}

const part = yield* session.updatePart({

id: PartID.ascending(),

messageID: ctx.assistantMessage.id,

sessionID: ctx.assistantMessage.sessionID,

type: "tool",

tool: input.name,

callID: input.id,

state: { status: "pending", input: {}, raw: "" },

metadata: input.providerExecuted ? { providerExecuted: true } : undefined,

} satisfies SessionV1.ToolPart)

ctx.toolcalls[input.id] = {

done: yield* Deferred.make<void>(),

partID: part.id,

messageID: part.messageID,

sessionID: part.sessionID,

}

return { call: ctx.toolcalls[input.id], part }

})

const isFilePart = (value: unknown): value is SessionV1.FilePart => Schema.is(SessionV1.FilePart)(value)

const toolResultOutput = (

value: Extract<StreamEvent, { type: "tool-result" }>,

): { title: string; metadata: Record<string, any>; output: string; attachments?: SessionV1.FilePart[] } => {

if (isRecord(value.result.value) && typeof value.result.value.output === "string") {

return {

title: typeof value.result.value.title === "string" ? value.result.value.title : value.name,

metadata: isRecord(value.result.value.metadata) ? value.result.value.metadata : {},

output: value.result.value.output,

attachments: Array.isArray(value.result.value.attachments)

? value.result.value.attachments.filter(isFilePart)

: undefined,

}

return {

title: value.name,

metadata: value.result.type === "json" && isRecord(value.result.value) ? value.result.value : {},

output:

typeof value.result.value === "string" ? value.result.value : (JSON.stringify(value.result.value) ?? ""),

}

const handleEvent = Effect.fnUntraced(function* (value: StreamEvent) {

switch (value.type) {

case "reasoning-start":

if (value.id in ctx.reasoningMap) return

ctx.reasoningMap[value.id] = {

id: PartID.ascending(),

messageID: ctx.assistantMessage.id,

sessionID: ctx.assistantMessage.sessionID,

type: "reasoning",

text: "",

time: { start: Date.now() },

metadata: value.providerMetadata,

}

yield* session.updatePart(ctx.reasoningMap[value.id])

return

case "reasoning-delta":

// Match dev: silently drop orphan deltas (no preceding reasoning-start).

if (!(value.id in ctx.reasoningMap)) return

ctx.reasoningMap[value.id].text += value.text

if (value.providerMetadata) ctx.reasoningMap[value.id].metadata = value.providerMetadata

yield* session.updatePartDelta({

sessionID: ctx.reasoningMap[value.id].sessionID,

messageID: ctx.reasoningMap[value.id].messageID,

partID: ctx.reasoningMap[value.id].id,

field: "text",

delta: value.text,

})

return

case "reasoning-end":

if (value.providerMetadata && value.id in ctx.reasoningMap) {

ctx.reasoningMap[value.id].metadata = value.providerMetadata

}

yield* finishReasoning(value.id)

return

case "tool-input-start":

if (ctx.assistantMessage.summary) {

throw new Error(`Tool call not allowed while generating summary: ${value.name}`)

}

yield* ensureToolCall(value)

return

case "tool-input-delta":

yield* ensureToolCall(value)

return

case "tool-input-end": {

yield* ensureToolCall(value)

return

}

case "tool-call": {

if (ctx.assistantMessage.summary) {

throw new Error(`Tool call not allowed while generating summary: ${value.name}`)

}

yield* ensureToolCall(value)

const input = isRecord(value.input) ? value.input : { value: value.input }

yield* updateToolCall(value.id, (match) => ({

...match,

tool: value.name,

state:

match.state.status === "running"

? { ...match.state, input }

: {

status: "running",

input,

time: { start: Date.now() },

metadata: match.metadata?.providerExecuted

? { ...value.providerMetadata, providerExecuted: true }

: value.providerMetadata,

}))

const parts = yield* MessageV2.parts(ctx.assistantMessage.id).pipe(

Effect.provideService(Database.Service, database),

)

const recentParts = parts.slice(-DOOM_LOOP_THRESHOLD)

if (

recentParts.length !== DOOM_LOOP_THRESHOLD ||

!recentParts.every(

(part) =>

part.type === "tool" &&

part.tool === value.name &&

part.state.status !== "pending" &&

JSON.stringify(part.state.input) === JSON.stringify(input),

)

) {

return

}

const agent = yield* agents.get(ctx.assistantMessage.agent)

yield* permission.ask({

permission: "doom_loop",

patterns: [value.name],

sessionID: ctx.assistantMessage.sessionID,

metadata: { tool: value.name, input },

always: [value.name],

ruleset: agent.permission,

})

return

}

case "tool-result": {

const toolCall = yield* readToolCall(value.id)

if (!toolCall && value.result.type === "error") return

if (value.result.type === "error") {

yield* failToolCall(value.id, value.result.value)

return

}

const rawOutput = toolResultOutput(value)

const normalized = yield* Effect.forEach(rawOutput.attachments ?? [], (attachment) =>

attachment.mime.startsWith("image/")

? image.normalize(attachment).pipe(

Effect.catchIf(

(error) => error instanceof Image.ResizerUnavailableError,

() => Effect.succeed(attachment),

Effect.exit,

)

: Effect.succeed(Exit.succeed<SessionV1.FilePart>(attachment)),

)

const failures = normalized

.filter(Exit.isFailure)

.map((exit) => Option.getOrUndefined(Cause.findErrorOption(exit.cause)))

const attachments = normalized.filter(Exit.isSuccess).map((item) => item.value)

const output = {

...rawOutput,

output:

failures.length === 0

? rawOutput.output

: `${rawOutput.output}\n\n${omittedImagesMessage(failures)}`,

attachments: attachments.length ? attachments : undefined,

}

yield* completeToolCall(value.id, output)

return

}

case "tool-error": {

yield* failToolCall(value.id, value.error ?? new Error(value.message))

return

}

case "provider-error":

throw new Error(value.message)

case "step-start":

if (!ctx.snapshot) ctx.snapshot = yield* snapshot.track()

yield* session.updatePart({

id: PartID.ascending(),

messageID: ctx.assistantMessage.id,

sessionID: ctx.sessionID,

snapshot: ctx.snapshot,

type: "step-start",

})

return

case "step-finish": {

const completedSnapshot = yield* snapshot.track()

yield* Effect.forEach(Object.keys(ctx.reasoningMap), finishReasoning)

const usage = Session.getUsage({

model: ctx.model,

usage: value.usage ?? new Usage({}),

metadata: value.providerMetadata,

})

const previous = ctx.outputLimitUsage

const total =

previous?.tokens.total === undefined && usage.tokens.total === undefined

? undefined

: (previous?.tokens.total ?? 0) + (usage.tokens.total ?? 0)

const accounted = {

cost: (previous?.cost ?? 0) + usage.cost,

tokens: {

...(total === undefined ? {} : { total }),

input: (previous?.tokens.input ?? 0) + usage.tokens.input,

output: (previous?.tokens.output ?? 0) + usage.tokens.output,

reasoning: (previous?.tokens.reasoning ?? 0) + usage.tokens.reasoning,

cache: {

read: (previous?.tokens.cache.read ?? 0) + usage.tokens.cache.read,

write: (previous?.tokens.cache.write ?? 0) + usage.tokens.cache.write,

}

ctx.outputLimitUsage = value.reason === "length" ? accounted : undefined

ctx.assistantMessage.finish = value.reason

ctx.assistantMessage.cost += usage.cost

ctx.assistantMessage.tokens = accounted.tokens

yield* session.updatePart({

id: PartID.ascending(),

reason: value.reason,

snapshot: completedSnapshot,

messageID: ctx.assistantMessage.id,

sessionID: ctx.assistantMessage.sessionID,

type: "step-finish",

tokens: accounted.tokens,

cost: accounted.cost,

})

yield* session.updateMessage(ctx.assistantMessage)

if (value.reason === "length") throw new SessionV1.OutputLengthError({})

if (ctx.snapshot) {

const patch = yield* snapshot.patch(ctx.snapshot)

if (patch.files.length) {

yield* session.updatePart({

id: PartID.ascending(),

messageID: ctx.assistantMessage.id,

sessionID: ctx.sessionID,

type: "patch",

hash: patch.hash,

files: patch.files,

})

}

ctx.snapshot = undefined

}

yield* summary

.summarize({

sessionID: ctx.sessionID,

messageID: ctx.assistantMessage.parentID,

})

.pipe(Effect.ignore, Effect.forkIn(scope))

if (

!ctx.assistantMessage.summary &&

isOverflow({ cfg: yield* config.get(), tokens: usage.tokens, model: ctx.model })

) {

ctx.needsCompaction = true

}

return

}

case "text-start":

ctx.currentText = {

id: PartID.ascending(),

messageID: ctx.assistantMessage.id,

sessionID: ctx.assistantMessage.sessionID,

type: "text",

text: "",

time: { start: Date.now() },

metadata: value.providerMetadata,

}

yield* session.updatePart(ctx.currentText)

return

case "text-delta":

if (!ctx.currentText) return

ctx.currentText.text += value.text

if (value.providerMetadata) ctx.currentText.metadata = value.providerMetadata

yield* session.updatePartDelta({

sessionID: ctx.currentText.sessionID,

messageID: ctx.currentText.messageID,

partID: ctx.currentText.id,

field: "text",

delta: value.text,

})

return

case "text-end":

if (!ctx.currentText) return

// oxlint-disable-next-line no-self-assign -- reactivity trigger

ctx.currentText.text = ctx.currentText.text

ctx.currentText.text = (yield* plugin.trigger(

"experimental.text.complete",

{

sessionID: ctx.sessionID,

messageID: ctx.assistantMessage.id,

partID: ctx.currentText.id,

{ text: ctx.currentText.text },

)).text

{

const end = Date.now()

ctx.currentText.time = { start: ctx.currentText.time?.start ?? end, end }

}

if (value.providerMetadata) ctx.currentText.metadata = value.providerMetadata

yield* session.updatePart(ctx.currentText)

ctx.currentText = undefined

return

case "finish":

return

}

})

const cleanup = Effect.fn("SessionProcessor.cleanup")(function* () {

if (ctx.snapshot) {

const patch = yield* snapshot.patch(ctx.snapshot)

if (patch.files.length) {

yield* session.updatePart({

id: PartID.ascending(),

messageID: ctx.assistantMessage.id,

sessionID: ctx.sessionID,

type: "patch",

hash: patch.hash,

files: patch.files,

})

}

ctx.snapshot = undefined

}

if (ctx.currentText) {

const end = Date.now()

ctx.currentText.time = { start: ctx.currentText.time?.start ?? end, end }

yield* session.updatePart(ctx.currentText)

ctx.currentText = undefined

}

for (const part of Object.values(ctx.reasoningMap)) {

const end = Date.now()

yield* session.updatePart({

...part,

time: { start: part.time.start ?? end, end },

})

}

ctx.reasoningMap = {}

yield* Effect.forEach(

Object.values(ctx.toolcalls),

(call) => Deferred.await(call.done).pipe(Effect.timeout("250 millis"), Effect.ignore),

{ concurrency: "unbounded" },

)

for (const toolCallID of Object.keys(ctx.toolcalls)) {

const match = yield* readToolCall(toolCallID)

if (!match) continue

const part = match.part

const end = Date.now()

const metadata = "metadata" in part.state && isRecord(part.state.metadata) ? part.state.metadata : {}

yield* session.updatePart({

...part,

state: {

...part.state,

status: "error",

error: "Tool execution aborted",

metadata: { ...metadata, interrupted: true },

time: { start: "time" in part.state ? part.state.time.start : end, end },

})

}

ctx.toolcalls = {}

ctx.assistantMessage.time.completed = Date.now()

yield* session.updateMessage(ctx.assistantMessage)

})

const halt = Effect.fn("SessionProcessor.halt")(function* (e: unknown) {

yield* Effect.logError("process", {

"session.id": input.sessionID,

messageID: input.assistantMessage.id,

error: errorMessage(e),

stack: e instanceof Error ? e.stack : undefined,

})

const error = parse(e)

if (SessionV1.ContextOverflowError.isInstance(error)) {

if ((yield* config.get()).compaction?.auto === false && !ctx.assistantMessage.summary) {

ctx.assistantMessage.error = error

ctx.assistantMessage.finish = "error"

yield* events.publish(Session.Event.Error, { sessionID: ctx.sessionID, error })

yield* status.set(ctx.sessionID, { type: "idle" })

return

}

// Recovery attempt, not an outcome: auto-compaction will retry, so

// nothing is published here. The durable message carries no error

// either; announcing one on the error channel made every consumer

// (CLI exit code, TUI toast, orchestrators) fail runs that recover.

// If compaction cannot shrink the session, compaction.ts publishes

// the terminal error.

ctx.needsCompaction = true

return

}

ctx.assistantMessage.error = error

yield* events.publish(Session.Event.Error, {

sessionID: ctx.assistantMessage.sessionID,

error: ctx.assistantMessage.error,

})

yield* status.set(ctx.sessionID, { type: "idle" })

})

const process = Effect.fn("SessionProcessor.process")(function* (streamInput: LLM.StreamInput) {

yield* Effect.logInfo("process", {

"session.id": input.sessionID,

messageID: input.assistantMessage.id,

})

ctx.needsCompaction = false

ctx.shouldBreak = (yield* config.get()).experimental?.continue_loop_on_deny !== true

return yield* Effect.gen(function* () {

yield* Effect.gen(function* () {

ctx.currentText = undefined

ctx.reasoningMap = {}

yield* status.set(ctx.sessionID, { type: "busy" })

const stream = llm.stream(streamInput)

yield* stream.pipe(

Stream.tap((event) => handleEvent(event)),

Stream.takeUntil(() => ctx.needsCompaction),

Stream.runDrain,

)

}).pipe(

Effect.onInterrupt(() =>

Effect.gen(function* () {

aborted = true

if (!ctx.assistantMessage.error) {

yield* halt(new DOMException("Aborted", "AbortError"))

}

}),

Effect.catchCauseIf(

(cause) => !Cause.hasInterruptsOnly(cause),

(cause) => Effect.fail(Cause.squash(cause)),

Effect.retry(

SessionRetry.policy({

provider: input.model.providerID,

parse,

// Only replace attempts that will be retried. Cloud intentionally

// returns the terminal partial next to the truncation error.

onRetry: (error) =>

SessionV1.OutputLengthError.isInstance(error) ? resetOutputLimit() : Effect.void,

set: (info) => {

return status.set(ctx.sessionID, {

type: "retry",

attempt: info.attempt,

message: info.message,

action: info.action,

next: info.next,

})

}),

Effect.catch(halt),

Effect.ensuring(cleanup()),

)

if (ctx.needsCompaction) return "compact"

if (ctx.blocked || ctx.assistantMessage.error) return "stop"

return "continue"

})

return {

get message() {

return ctx.assistantMessage

updateToolCall,

completeToolCall,

process,

} satisfies Handle

})

return Service.of({ create })

}),

)

export const node = LayerNode.make({

service: Service,

layer: layer,

deps: [

Session.node,

Config.node,

Snapshot.node,

Agent.node,

LLM.node,

Permission.node,

Plugin.node,

SessionSummary.node,

SessionStatus.node,

Image.node,

EventV2Bridge.node,

Database.node,

})

export * as SessionProcessor from "./processor"

browsercode/packages/opencode/src/session/processor.ts at main · code2labgit/browsercode · GitHub

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