Extract the event model into its own crate, shared with client-core

RUST.md's recommendation item 1 starts here: Event, QuestionOption, SessionStatus, ImageRef, AttachmentRef, SeqEvent, context_tokens and context_after move to a new event-model crate so a future Rust client shares one definition with server/ instead of Events.kt's hand-kept mirror. session/driver.rs and session/transcript.rs re-export everything they used to define, so nothing downstream of either module changed. cargo test (127 passed), clippy --all-targets and fmt clean in both server/ and event-model/. Co-Authored-By: Claude Sonnet <noreply@anthropic.com>
2026-09-04 22:40:15 -04:00
1 parent 1fcaa2d72d
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+[package]
+name = "event-model"
+version = "0.1.0"
+edition = "2024"
+
+# The common event model, extracted from `server/session/driver.rs` and
+# `session/transcript.rs` so a Rust client (`client-core`) can share one
+# definition with the server instead of hand-mirroring it the way
+# `app/.../Events.kt` used to. Nothing here talks to a process, a file, or a
+# socket -- it is exactly the wire shape in PLAN.md's "common event model",
+# plus the transcript envelope and the context-token rule three different
+# readers (the pump, the transcript, and a phone folding the same events)
+# have to agree on.
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+# `Event::ToolStart.input` is a tool's raw call arguments, whatever shape the
+# dialect gave them -- typing it further would mean this crate knowing every
+# driver's tool schema.
+serde_json = { version = "1", features = ["float_roundtrip"] }
@@ -0,0 +1,377 @@
+//! The common event model: what a driver's process turns into before it
+//! touches the transcript or the phone (see `PLAN.md`'s "The common event
+//! model"). Extracted from `server/src/session/driver.rs` and
+//! `session/transcript.rs` on 2026-09-04 so `client-core` shares this
+//! definition instead of hand-mirroring it, which is what
+//! `app/.../Events.kt` used to do. `server/`'s `session::driver` module
+//! re-exports everything here, so nothing downstream of it had to change.
+//!
+//! What stayed behind in `server/`: the `Driver` trait, `SessionCommand`,
+//! `Unqueued` and `EventSink`. Those are how *this* server runs a session,
+//! not part of what a client reads off the wire.
+
+use serde::{Deserialize, Serialize};
+
+/// The name a session's image is stored and served under -- minted for an
+/// upload or for one a tool produced, and fetched back from
+/// `/sessions/{id}/files/{ref}`. One id both directions, so the transcript
+/// renders them identically.
+pub type ImageRef = String;
+
+/// The name an upload is stored and served under: an image is
+/// `<hex>.<extension>` and is an [`ImageRef`] like any other; any other file
+/// keeps its own name after the hex, `<hex>-<name>`, because the name is what
+/// the reader attached and what the session is told. Told apart by
+/// `crate::media::media_type_for`.
+pub type AttachmentRef = String;
+
+/// One choice offered in answer to a [`Event::Question`]. More than a label
+/// because the reader is deciding rather than confirming: what an option
+/// means, and what picking it would produce, are what decide it.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct QuestionOption {
+    pub label: String,
+    /// A sentence about what this option means.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub description: Option<String>,
+    /// A block to show as written -- a mockup, a diff, a config file.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub preview: Option<String>,
+}
+
+impl QuestionOption {
+    pub fn plain(label: impl Into<String>) -> Self {
+        Self {
+            label: label.into(),
+            description: None,
+            preview: None,
+        }
+    }
+}
+
+/// Everything a session can tell the outside world. Every event is appended
+/// to the transcript with a sequence number, then fanned out to SSE
+/// subscribers, so reconnecting is just "events after seq N" -- no separate
+/// history path to drift from the live one.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+// `rename_all` renames the variants; `rename_all_fields` renames what is
+// inside them. Both are needed and only the first is obvious: every field
+// here was one lowercase word until `pre_tokens` arrived, so a multi-word
+// field went out as snake_case, the app looked for camelCase and found
+// nothing, and the event still rendered -- as the "no counts reported" case,
+// which is a state it is allowed to be in.
+#[serde(
+    tag = "type",
+    rename_all = "camelCase",
+    rename_all_fields = "camelCase"
+)]
+pub enum Event {
+    /// What the user sent, written into the transcript by the manager (not by
+    /// drivers) so every device renders the conversation from one stream.
+    /// Recorded when the session reads it, which is what `MessageTaken` reports.
+    UserMessage {
+        /// The [`Event::MessageQueued`] this resolves, when it waited. The
+        /// phone has a bubble on screen for the waiting message and needs to
+        /// know *which* one this is, rather than matching on the text and
+        /// clearing the wrong one when the same thing was sent twice.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        id: Option<String>,
+        text: String,
+        /// What was attached, by the ref the files route serves. On the
+        /// message rather than beside it: these used to be their own `Image`
+        /// events just before, which left the phone deciding from adjacency
+        /// which message an image belonged to. `images` on disk until
+        /// 2026-09-03, when files joined them; the alias reads the older rows.
+        #[serde(default, alias = "images", skip_serializing_if = "Vec::is_empty")]
+        attachments: Vec<AttachmentRef>,
+    },
+    /// A message accepted from the phone that the session cannot read yet.
+    ///
+    /// Recorded, unlike the message itself, and that difference is the point:
+    /// the message belongs in the transcript where the session read it, but
+    /// something has to say it is waiting, and it has to be the server. The
+    /// phone used to remember its own outgoing messages, so leaving the
+    /// screen showed nothing pending when something was.
+    ///
+    /// Carries no row of its own; resolved by the `UserMessage` bearing the
+    /// same id, as `CommandQueued` is resolved by `CommandSent`.
+    MessageQueued {
+        id: String,
+        text: String,
+        /// Carried for the same reason [`Event::UserMessage`] carries it,
+        /// and it matters more here: a waiting message is on screen for as
+        /// long as the turn runs, so its attachment has nowhere else to be.
+        #[serde(default, alias = "images", skip_serializing_if = "Vec::is_empty")]
+        attachments: Vec<AttachmentRef>,
+    },
+    /// A message taken out of the queue before the session read it.
+    ///
+    /// Recorded for the same reason `MessageQueued` is: the queue is the
+    /// server's, so what is waiting has to be answerable from the transcript
+    /// alone. Without it a phone that reconnects replays the `MessageQueued`
+    /// and puts back a bubble nothing will ever resolve -- the `UserMessage`
+    /// that normally does is exactly what is not coming.
+    ///
+    /// Only ever sent for a message that had not been handed over; see
+    /// [`Unqueued::AlreadySent`].
+    MessageDropped {
+        id: String,
+    },
+    /// A driver has taken one of the user's messages and started reading it.
+    /// The manager turns this into the `UserMessage` above, so it never
+    /// reaches a phone itself.
+    ///
+    /// It exists because sending and being read are not the same moment. A
+    /// message sent into a running turn waits, and recording it among things
+    /// already read puts it in the transcript above output that predates it.
+    MessageTaken {
+        /// The `MessageQueued` this answers, or `None` when it never waited.
+        /// Carried through onto the `UserMessage`.
+        id: Option<String>,
+        text: String,
+        #[serde(default, alias = "images", skip_serializing_if = "Vec::is_empty")]
+        attachments: Vec<AttachmentRef>,
+    },
+    /// Streaming assistant text; the phone renders the concatenation as
+    /// markdown.
+    AssistantText {
+        delta: String,
+    },
+    ToolStart {
+        id: String,
+        tool: String,
+        input: serde_json::Value,
+    },
+    ToolUpdate {
+        id: String,
+        output: String,
+    },
+    ToolEnd {
+        id: String,
+        output: String,
+    },
+    /// An image the session produced or was sent, saved under the session
+    /// dir and referenced by id; the phone fetches it by URL.
+    Image {
+        #[serde(rename = "ref")]
+        image: ImageRef,
+        /// The tool call whose result carried it, when one did. A screenshot
+        /// belongs under the call that took it, not floating beside it -- the
+        /// reader has to pair them by position otherwise, and position is
+        /// exactly what a page boundary breaks.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        about: Option<String>,
+    },
+    /// Anything the session needs a human for: AskUserQuestion, and
+    /// permission requests, are the same shape with different options.
+    Question {
+        id: String,
+        prompt: String,
+        /// A few words naming what the question is about, when the asker
+        /// offered one. `None` for a permission, which is about the call
+        /// above it.
+        header: Option<String>,
+        options: Vec<QuestionOption>,
+        /// Whether several options may be chosen at once. Here rather than
+        /// left for a phone to work out from the dialect underneath: how many
+        /// answers a question takes is a fact about the question, and the
+        /// alternative was Claude Code's tool-input schema written out a
+        /// second time in Kotlin, where no other dialect could reach it.
+        #[serde(default, skip_serializing_if = "std::ops::Not::not")]
+        multi_select: bool,
+        /// The tool call this is permission for, when it is one, so a phone
+        /// can draw the ask on the tool's own row rather than as a second
+        /// card repeating its input. `None` for anything not about a tool.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        about: Option<String>,
+    },
+    /// A message another agent sent this session.
+    ///
+    /// Its own kind rather than a `UserMessage`, because it is not something
+    /// the reader said and a transcript that renders it in their voice is
+    /// claiming they did. It also explains what would otherwise be
+    /// inexplicable: a session working on something nobody here asked for.
+    PeerMessage {
+        /// The sending session's own name, which is what the reader
+        /// recognises it by -- the socket path it came from is not.
+        from: String,
+        text: String,
+        /// The seq of the `Status::Running` that opened the turn this message
+        /// started, so a reader can draw it above that turn.
+        ///
+        /// The CLI says nothing about a peer message until the turn's
+        /// `result`, so the event is appended after everything it caused, and
+        /// an append-only transcript cannot go back and insert it. Carrying
+        /// the position instead keeps one order on the wire and one on screen.
+        ///
+        /// Filled in by the pump, the only place that knows a seq, and only
+        /// where a turn was open: `None` for a message replayed by `import`,
+        /// which already has it in the right place.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        turn_start: Option<u64>,
+    },
+    /// The manager's record of a question being answered, so a rendered
+    /// question card resolves on every device rather than only the one that
+    /// answered.
+    ///
+    /// A list because a question can take several answers, and one that took
+    /// one is the list of length one rather than a different shape.
+    Answered {
+        id: String,
+        answers: Vec<String>,
+    },
+    Status {
+        state: SessionStatus,
+    },
+    /// What the session is set to, as the session itself reports it.
+    ///
+    /// Asking for a change and having one are different things, and only this
+    /// is a measurement: a model name the dialect does not know, a mode it
+    /// refuses, or a driver whose model is fixed at startup all leave a
+    /// request that was sent and nothing that changed. Reporting from the
+    /// request put the answer on the phone before the question was answered.
+    ///
+    /// Either field alone, because the two are confirmed separately.
+    Settings {
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        model: Option<String>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        permission_mode: Option<String>,
+    },
+    /// Per-turn token counts, where the dialect reports them.
+    UsageDelta {
+        /// What this turn cost: the tokens it was charged for.
+        tokens: u64,
+        /// What the model was holding when the turn ended -- see
+        /// [`context_tokens`].
+        ///
+        /// Carried rather than summed by whoever is reading, because it is
+        /// not a sum: context goes *down* at a compaction and a clear, so
+        /// adding turns up would report a figure the session stopped being
+        /// true of long ago.
+        ///
+        /// `None` where the dialect did not say, which every reader has to be
+        /// able to draw.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        context: Option<u64>,
+    },
+    /// A compaction that finished, and how much context it recovered.
+    ///
+    /// The counts are the point, and a spinner is not. They are optional
+    /// because the record has shipped without them, and "the compaction
+    /// happened, we don't know by how much" is a state this has to be able to
+    /// say -- a plausible number would be indistinguishable from a counted one.
+    Compacted {
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        pre_tokens: Option<u64>,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        post_tokens: Option<u64>,
+        /// What asked for it, in the dialect's own word -- `auto` when the
+        /// session compacted on its own. Carried rather than reduced to a bool
+        /// so an unrecognised trigger stays unrecognised: an automatic
+        /// compaction is the one worth naming, because it explains a wait
+        /// nobody asked for.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        trigger: Option<String>,
+    },
+    /// A command the session was asked to run on itself, held because it
+    /// cannot run yet. These are not messages: `/compact` and `/rename` are
+    /// instructions about the session, and a session mid-turn reads a line
+    /// written to it as something the model should see. So they wait, and
+    /// this is what a phone draws while they do.
+    CommandQueued {
+        id: String,
+        text: String,
+    },
+    /// The same command, now handed to the session. Its [`CommandQueued`]
+    /// stops being pending when this arrives, matched by `id`; a command
+    /// that ran immediately has only this.
+    CommandSent {
+        id: String,
+        text: String,
+    },
+    /// The conversation was cleared: everything above this is still in the
+    /// record but is no longer in the session's context.
+    ///
+    /// Nothing is deleted. A transcript is the thing a person scrolls back
+    /// through, so this is a divider, not a truncation.
+    ///
+    /// **Load-bearing, not decorative.** For any driver that rebuilds its
+    /// conversation from the transcript, this marker decides what the model
+    /// is given -- dropping it, or treating it as something only the phone
+    /// draws, silently puts a cleared conversation back in front of the model
+    /// at full cost. Today `llama::conversation` is the only fold that reads
+    /// it, which is why this is written down rather than left to be inferred
+    /// from a second example that does not exist.
+    Cleared,
+    Error {
+        message: String,
+    },
+}
+
+/// How much the model was holding, from the three figures a turn reports:
+/// the input side only, prompt plus both cache figures. A cached token is
+/// cheaper but it is still one the model was given; output is what the turn
+/// produced rather than what continuing has to carry.
+///
+/// One function so the definition cannot drift, because it is extracted two
+/// quite different ways -- the live translators have the usage object parsed,
+/// and `import::context_tokens` scans it out of a raw line without parsing.
+pub fn context_tokens(input: u64, cache_creation: u64, cache_read: u64) -> u64 {
+    input + cache_creation + cache_read
+}
+
+/// The context after `event`, given what it was before.
+///
+/// The whole rule in one place, because three readers need the same answer:
+/// the pump keeping a live session's figure, the transcript seeding it at
+/// startup, and the phone folding the same events into what it draws.
+///
+/// The two that *lower* it are the point. A clear takes the conversation away
+/// and a compaction replaces it with a summary, so a figure measured before
+/// either stopped being true at that moment -- and carrying it forward is how
+/// a session that had just been cleared went on reporting the context it no
+/// longer had.
+///
+/// `None` is "we don't know", which each of them can reach.
+pub fn context_after(current: Option<u64>, event: &Event) -> Option<u64> {
+    match event {
+        // `or`, so a turn the dialect reported no usage for leaves the last
+        // measurement standing: stale by a turn, which every context figure
+        // is, rather than wrong.
+        Event::UsageDelta { context, .. } => context.or(current),
+        Event::Compacted { post_tokens, .. } => *post_tokens,
+        Event::Cleared => None,
+        _ => current,
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum SessionStatus {
+    Idle,
+    Running,
+    AwaitingInput,
+    Compacting,
+    Exited,
+    /// There is a process recorded for this session and the machine will not
+    /// say whether it is still running.
+    ///
+    /// Its own state rather than the nearest of the others, because both
+    /// neighbours are lies with consequences: `Exited` invites starting a
+    /// second process against a conversation that may already have one, and
+    /// `Idle` claims a session is waiting for you when nobody has checked.
+    Unknown,
+}
+
+/// One transcript line: an [`Event`] plus its position and time. The event
+/// is flattened so the wire shape stays one flat object.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct SeqEvent {
+    pub seq: u64,
+    /// Epoch seconds.
+    pub ts: f64,
+    #[serde(flatten)]
+    pub event: Event,
+}
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