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codex/codex-rs/exec/src/event_processor.rs
T
Michael Bolin 34aa1991f1 chore: handle all cases for EventMsg (#936)
For now, this removes the `#[non_exhaustive]` directive on `EventMsg` so
that we are forced to handle all `EventMsg` by default. (We may revisit
this if/when we publish `core/` as a `lib` crate.) For now, it is
helpful to have this as a forcing function because we have effectively
two UIs (`tui` and `exec`) and usually when we add a new variant to
`EventMsg`, we want to be sure that we update both.
2025-05-14 13:36:43 -07:00

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use chrono::Utc;
use codex_common::elapsed::format_elapsed;
use codex_core::protocol::AgentMessageEvent;
use codex_core::protocol::BackgroundEventEvent;
use codex_core::protocol::ErrorEvent;
use codex_core::protocol::Event;
use codex_core::protocol::EventMsg;
use codex_core::protocol::ExecCommandBeginEvent;
use codex_core::protocol::ExecCommandEndEvent;
use codex_core::protocol::FileChange;
use codex_core::protocol::McpToolCallBeginEvent;
use codex_core::protocol::McpToolCallEndEvent;
use codex_core::protocol::PatchApplyBeginEvent;
use codex_core::protocol::PatchApplyEndEvent;
use codex_core::protocol::SessionConfiguredEvent;
use owo_colors::OwoColorize;
use owo_colors::Style;
use shlex::try_join;
use std::collections::HashMap;
/// This should be configurable. When used in CI, users may not want to impose
/// a limit so they can see the full transcript.
const MAX_OUTPUT_LINES_FOR_EXEC_TOOL_CALL: usize = 20;
pub(crate) struct EventProcessor {
call_id_to_command: HashMap<String, ExecCommandBegin>,
call_id_to_patch: HashMap<String, PatchApplyBegin>,
/// Tracks in-flight MCP tool calls so we can calculate duration and print
/// a concise summary when the corresponding `McpToolCallEnd` event is
/// received.
call_id_to_tool_call: HashMap<String, McpToolCallBegin>,
// To ensure that --color=never is respected, ANSI escapes _must_ be added
// using .style() with one of these fields. If you need a new style, add a
// new field here.
bold: Style,
dimmed: Style,
magenta: Style,
red: Style,
green: Style,
}
impl EventProcessor {
pub(crate) fn create_with_ansi(with_ansi: bool) -> Self {
let call_id_to_command = HashMap::new();
let call_id_to_patch = HashMap::new();
let call_id_to_tool_call = HashMap::new();
if with_ansi {
Self {
call_id_to_command,
call_id_to_patch,
bold: Style::new().bold(),
dimmed: Style::new().dimmed(),
magenta: Style::new().magenta(),
red: Style::new().red(),
green: Style::new().green(),
call_id_to_tool_call,
}
} else {
Self {
call_id_to_command,
call_id_to_patch,
bold: Style::new(),
dimmed: Style::new(),
magenta: Style::new(),
red: Style::new(),
green: Style::new(),
call_id_to_tool_call,
}
}
}
}
struct ExecCommandBegin {
command: Vec<String>,
start_time: chrono::DateTime<Utc>,
}
/// Metadata captured when an `McpToolCallBegin` event is received.
struct McpToolCallBegin {
/// Formatted invocation string, e.g. `server.tool({"city":"sf"})`.
invocation: String,
/// Timestamp when the call started so we can compute duration later.
start_time: chrono::DateTime<Utc>,
}
struct PatchApplyBegin {
start_time: chrono::DateTime<Utc>,
auto_approved: bool,
}
macro_rules! ts_println {
($($arg:tt)*) => {{
let now = Utc::now();
let formatted = now.format("%Y-%m-%dT%H:%M:%S").to_string();
print!("[{}] ", formatted);
println!($($arg)*);
}};
}
impl EventProcessor {
pub(crate) fn process_event(&mut self, event: Event) {
let Event { id, msg } = event;
match msg {
EventMsg::Error(ErrorEvent { message }) => {
let prefix = "ERROR:".style(self.red);
ts_println!("{prefix} {message}");
}
EventMsg::BackgroundEvent(BackgroundEventEvent { message }) => {
ts_println!("{}", message.style(self.dimmed));
}
EventMsg::TaskStarted => {
let msg = format!("Task started: {id}");
ts_println!("{}", msg.style(self.dimmed));
}
EventMsg::TaskComplete => {
let msg = format!("Task complete: {id}");
ts_println!("{}", msg.style(self.bold));
}
EventMsg::AgentMessage(AgentMessageEvent { message }) => {
let prefix = "Agent message:".style(self.bold);
ts_println!("{prefix} {message}");
}
EventMsg::ExecCommandBegin(ExecCommandBeginEvent {
call_id,
command,
cwd,
}) => {
self.call_id_to_command.insert(
call_id.clone(),
ExecCommandBegin {
command: command.clone(),
start_time: Utc::now(),
},
);
ts_println!(
"{} {} in {}",
"exec".style(self.magenta),
escape_command(&command).style(self.bold),
cwd.to_string_lossy(),
);
}
EventMsg::ExecCommandEnd(ExecCommandEndEvent {
call_id,
stdout,
stderr,
exit_code,
}) => {
let exec_command = self.call_id_to_command.remove(&call_id);
let (duration, call) = if let Some(ExecCommandBegin {
command,
start_time,
}) = exec_command
{
(
format!(" in {}", format_elapsed(start_time)),
format!("{}", escape_command(&command).style(self.bold)),
)
} else {
("".to_string(), format!("exec('{call_id}')"))
};
let output = if exit_code == 0 { stdout } else { stderr };
let truncated_output = output
.lines()
.take(MAX_OUTPUT_LINES_FOR_EXEC_TOOL_CALL)
.collect::<Vec<_>>()
.join("\n");
match exit_code {
0 => {
let title = format!("{call} succeeded{duration}:");
ts_println!("{}", title.style(self.green));
}
_ => {
let title = format!("{call} exited {exit_code}{duration}:");
ts_println!("{}", title.style(self.red));
}
}
println!("{}", truncated_output.style(self.dimmed));
}
EventMsg::McpToolCallBegin(McpToolCallBeginEvent {
call_id,
server,
tool,
arguments,
}) => {
// Build fully-qualified tool name: server.tool
let fq_tool_name = format!("{server}.{tool}");
// Format arguments as compact JSON so they fit on one line.
let args_str = arguments
.as_ref()
.map(|v: &serde_json::Value| {
serde_json::to_string(v).unwrap_or_else(|_| v.to_string())
})
.unwrap_or_default();
let invocation = if args_str.is_empty() {
format!("{fq_tool_name}()")
} else {
format!("{fq_tool_name}({args_str})")
};
self.call_id_to_tool_call.insert(
call_id.clone(),
McpToolCallBegin {
invocation: invocation.clone(),
start_time: Utc::now(),
},
);
ts_println!(
"{} {}",
"tool".style(self.magenta),
invocation.style(self.bold),
);
}
EventMsg::McpToolCallEnd(McpToolCallEndEvent {
call_id,
success,
result,
}) => {
// Retrieve start time and invocation for duration calculation and labeling.
let info = self.call_id_to_tool_call.remove(&call_id);
let (duration, invocation) = if let Some(McpToolCallBegin {
invocation,
start_time,
..
}) = info
{
(format!(" in {}", format_elapsed(start_time)), invocation)
} else {
(String::new(), format!("tool('{call_id}')"))
};
let status_str = if success { "success" } else { "failed" };
let title_style = if success { self.green } else { self.red };
let title = format!("{invocation} {status_str}{duration}:");
ts_println!("{}", title.style(title_style));
if let Some(res) = result {
let val: serde_json::Value = res.into();
let pretty =
serde_json::to_string_pretty(&val).unwrap_or_else(|_| val.to_string());
for line in pretty.lines().take(MAX_OUTPUT_LINES_FOR_EXEC_TOOL_CALL) {
println!("{}", line.style(self.dimmed));
}
}
}
EventMsg::PatchApplyBegin(PatchApplyBeginEvent {
call_id,
auto_approved,
changes,
}) => {
// Store metadata so we can calculate duration later when we
// receive the corresponding PatchApplyEnd event.
self.call_id_to_patch.insert(
call_id.clone(),
PatchApplyBegin {
start_time: Utc::now(),
auto_approved,
},
);
ts_println!(
"{} auto_approved={}:",
"apply_patch".style(self.magenta),
auto_approved,
);
// Pretty-print the patch summary with colored diff markers so
// it’s easy to scan in the terminal output.
for (path, change) in changes.iter() {
match change {
FileChange::Add { content } => {
let header = format!(
"{} {}",
format_file_change(change),
path.to_string_lossy()
);
println!("{}", header.style(self.magenta));
for line in content.lines() {
println!("{}", line.style(self.green));
}
}
FileChange::Delete => {
let header = format!(
"{} {}",
format_file_change(change),
path.to_string_lossy()
);
println!("{}", header.style(self.magenta));
}
FileChange::Update {
unified_diff,
move_path,
} => {
let header = if let Some(dest) = move_path {
format!(
"{} {} -> {}",
format_file_change(change),
path.to_string_lossy(),
dest.to_string_lossy()
)
} else {
format!("{} {}", format_file_change(change), path.to_string_lossy())
};
println!("{}", header.style(self.magenta));
// Colorize diff lines. We keep file header lines
// (--- / +++) without extra coloring so they are
// still readable.
for diff_line in unified_diff.lines() {
if diff_line.starts_with('+') && !diff_line.starts_with("+++") {
println!("{}", diff_line.style(self.green));
} else if diff_line.starts_with('-')
&& !diff_line.starts_with("---")
{
println!("{}", diff_line.style(self.red));
} else {
println!("{diff_line}");
}
}
}
}
}
}
EventMsg::PatchApplyEnd(PatchApplyEndEvent {
call_id,
stdout,
stderr,
success,
}) => {
let patch_begin = self.call_id_to_patch.remove(&call_id);
// Compute duration and summary label similar to exec commands.
let (duration, label) = if let Some(PatchApplyBegin {
start_time,
auto_approved,
}) = patch_begin
{
(
format!(" in {}", format_elapsed(start_time)),
format!("apply_patch(auto_approved={})", auto_approved),
)
} else {
(String::new(), format!("apply_patch('{call_id}')"))
};
let (exit_code, output, title_style) = if success {
(0, stdout, self.green)
} else {
(1, stderr, self.red)
};
let title = format!("{label} exited {exit_code}{duration}:");
ts_println!("{}", title.style(title_style));
for line in output.lines() {
println!("{}", line.style(self.dimmed));
}
}
EventMsg::ExecApprovalRequest(_) => {
// Should we exit?
}
EventMsg::ApplyPatchApprovalRequest(_) => {
// Should we exit?
}
EventMsg::AgentReasoning(agent_reasoning_event) => {
println!("thinking: {}", agent_reasoning_event.text);
}
EventMsg::SessionConfigured(session_configured_event) => {
let SessionConfiguredEvent { session_id, model } = session_configured_event;
println!("session {session_id} with model {model}");
}
}
}
}
fn escape_command(command: &[String]) -> String {
try_join(command.iter().map(|s| s.as_str())).unwrap_or_else(|_| command.join(" "))
}
fn format_file_change(change: &FileChange) -> &'static str {
match change {
FileChange::Add { .. } => "A",
FileChange::Delete => "D",
FileChange::Update {
move_path: Some(_), ..
} => "R",
FileChange::Update {
move_path: None, ..
} => "M",
}
}