objectiveai-cli 2.2.2

//! Shared process-lifecycle primitives for the `{api,viewer,mcp,db}
//! spawn|kill` cli subcommands.

use std::path::Path;

use sysinfo::{ProcessRefreshKind, ProcessesToUpdate, Signal, System};
use tokio::process::Command;

/// Send SIGTERM (Unix) / TerminateProcess (Windows) to one specific
/// pid. Returns 1 if a live process with that pid existed and was
/// targeted, 0 otherwise. Used by `db kill`, where the postmaster's
/// pid comes from `postmaster.pid` and a name match would hit
/// unrelated postgres servers.
pub fn kill_pid(pid: u32) -> usize {
    let mut sys = System::new();
    sys.refresh_processes_specifics(ProcessesToUpdate::All, true, ProcessRefreshKind::nothing());
    match sys.process(sysinfo::Pid::from_u32(pid)) {
        Some(process) => {
            let _ = process
                .kill_with(Signal::Term)
                .or_else(|| Some(process.kill()));
            1
        }
        None => 0,
    }
}

/// Absolutize a relative exec *path* against `cwd`; keep bare names'
/// PATH-lookup semantics. Shared by `tools run` and `plugins run`,
/// whose manifest exec paths are relative to their version / `cli`
/// folder (e.g. `./count-tool.exe`) — but on Windows `CreateProcess`
/// resolves a relative program against the PARENT's cwd, not the
/// child's `current_dir` (rust-lang/rust#37868), so the spawn would
/// miss the binary entirely without this.
///
/// Path-vs-name is decided by `Path::components()`, which encodes
/// the platform split for us:
///   - Windows: `/` and `\` are both separators (and both illegal
///     in file names), so either marks a path — 2+ components.
///   - Unix: only `/` separates; `\` is a legal filename byte, so
///     a program literally named `my\tool` stays a bare name —
///     1 component — and still resolves via PATH.
pub fn resolve_program(program: String, cwd: &Path) -> std::ffi::OsString {
    let path = Path::new(&program);
    if path.components().count() > 1 && path.is_relative() {
        cwd.join(path).into_os_string()
    } else {
        program.into()
    }
}

/// Lock-based background spawn shared by the four `* spawn` commands.
///
/// A server's readiness signal is its lockfile: once its listener is
/// bound, each server claims `(lock_dir, key)` via
/// [`objectiveai_sdk::lockfile`] and publishes its client-connect URL
/// as the lock contents. The flow:
///
/// 1. [`objectiveai_sdk::lockfile::try_read`] — if the lock is already
///    held by a live owner, the server is already up; return its
///    published URL without spawning anything.
/// 2. Otherwise spawn `exe`. The child INHERITS the cli's environment
///    — the dev/test `bin` entries are cargo-run shims, and a build
///    needs the full machine environment (PATH, the MSVC toolchain
///    discovery vars, cargo/rustup homes). Config isolation is the
///    spawn commands' job instead: each `configure` explicitly
///    `env_remove`s every env key its server binary's config struct
///    reads that it doesn't deliberately set, so the spawning shell's
///    configuration never leaks into a server other processes will
///    share. Null stdin; stdout/stderr are piped and drained so a
///    child that dies before publishing reports its own output in
///    the error; detached from the console on Windows
///    (`CREATE_NO_WINDOW | DETACHED_PROCESS`); `kill_on_drop` stays
///    false everywhere so the child outlives the cli (Unix re-parents
///    it to init when the cli exits).
/// 3. Subscribe to the lock ([`objectiveai_sdk::lockfile::wait_read`]),
///    racing the child's exit. Lock published → the server is up and
///    its URL is returned. Child exited first → one last `try_read`:
///    the child may have died because it lost the claim race to a
///    concurrently spawned server, and a held lock now means one won
///    in reality — return its URL. Only a dead child AND a free lock
///    is a failure. (Without the child arm the subscribing read would
///    wait forever on a dead child.)
pub async fn spawn_until_lock_published(
    exe: &Path,
    lock_dir: &Path,
    key: &str,
    configure: impl FnOnce(&mut Command),
) -> Result<String, crate::error::Error> {
    let lock_err = |e: std::io::Error| crate::error::Error::Lockfile {
        key: key.to_string(),
        source: e,
    };

    if let Some(listening) = objectiveai_sdk::lockfile::try_read(lock_dir, key)
        .await
        .map_err(lock_err)?
    {
        return Ok(listening);
    }

    let name = exe
        .file_name()
        .map(|s| s.to_string_lossy().into_owned())
        .unwrap_or_else(|| exe.display().to_string());

    // Pipe both output streams: a child that dies before publishing
    // would otherwise leave no trace, so its captured stdout/stderr
    // are embedded in the failure error. On the success path the
    // captured bytes are simply abandoned — the detached server is
    // quiet by design (`SUPPRESS_OUTPUT`), and the pipes close with
    // this cli process.
    let mut cmd = Command::new(exe);
    cmd.stdin(std::process::Stdio::null())
        .stdout(std::process::Stdio::piped())
        .stderr(std::process::Stdio::piped());
    #[cfg(windows)]
    {
        // CREATE_NO_WINDOW (0x08000000) | DETACHED_PROCESS (0x00000008)
        // — keep the spawned binary off the parent console and let it
        // outlive the cli. (The cli's own stdio handles were made
        // non-inheritable at entry — `crate::clear_stdio_inheritance`
        // — so the invoker's capture pipes can't leak into this
        // long-lived child and pin its readers open.)
        cmd.creation_flags(0x0800_0008);
    }
    configure(&mut cmd);

    let mut child = cmd
        .spawn()
        .map_err(|e| crate::error::Error::Spawn(name.clone(), e))?;

    // Drain both pipes from the moment of spawn: a failing child can
    // spew more than a pipe buffer before exiting, and an undrained
    // pipe would wedge it before it ever reports.
    let mut stdout_pipe = child.stdout.take();
    let mut stderr_pipe = child.stderr.take();
    let stdout_task = tokio::spawn(async move {
        use tokio::io::AsyncReadExt;
        let mut buf = Vec::new();
        if let Some(pipe) = stdout_pipe.as_mut() {
            let _ = pipe.read_to_end(&mut buf).await;
        }
        buf
    });
    let stderr_task = tokio::spawn(async move {
        use tokio::io::AsyncReadExt;
        let mut buf = Vec::new();
        if let Some(pipe) = stderr_pipe.as_mut() {
            let _ = pipe.read_to_end(&mut buf).await;
        }
        buf
    });

    let listening = tokio::select! {
        read = objectiveai_sdk::lockfile::wait_read(lock_dir, key) => read.map_err(lock_err)?,
        status = child.wait() => {
            // The child may have lost the claim race to a concurrently
            // spawned server — re-probe before declaring failure. Held
            // now ⇒ one won in reality ⇒ success.
            return match objectiveai_sdk::lockfile::try_read(lock_dir, key)
                .await
                .map_err(lock_err)?
            {
                Some(listening) => Ok(listening),
                None => {
                    // The dead child's pipes EOF promptly; the timeout
                    // guards the exotic case of a still-living
                    // grandchild holding the write ends open.
                    let drain_timeout = std::time::Duration::from_secs(2);
                    let stdout = match tokio::time::timeout(drain_timeout, stdout_task).await {
                        Ok(Ok(buf)) => buf,
                        _ => Vec::new(),
                    };
                    let stderr = match tokio::time::timeout(drain_timeout, stderr_task).await {
                        Ok(Ok(buf)) => buf,
                        _ => Vec::new(),
                    };
                    // One last probe before declaring failure: the
                    // drain gave a concurrently-spawned winner extra
                    // time to publish, and a lost race is a success.
                    if let Some(listening) =
                        objectiveai_sdk::lockfile::try_read(lock_dir, key)
                            .await
                            .map_err(lock_err)?
                    {
                        return Ok(listening);
                    }
                    Err(crate::error::Error::SpawnExitedBeforePublishing {
                        name,
                        status: status.map_err(|e| crate::error::Error::Spawn(key.to_string(), e))?,
                        stdout: String::from_utf8_lossy(&stdout).trim().to_string(),
                        stderr: String::from_utf8_lossy(&stderr).trim().to_string(),
                    })
                }
            };
        }
    };

    // tokio's Child drops without killing (kill_on_drop is false by
    // default), so the spawned binary is detached: on Unix the kernel
    // re-parents it to init when the cli exits; on Windows the parent's
    // handle is released and the spawned binary continues.
    drop(child);

    Ok(listening)
}

/// Stamp every field of the cli's [`crate::Config`] onto `cmd`'s env
/// using the same env-var names the [`crate::run::EnvConfigBuilder`]
/// reads on the receiving side. So a child cli (or any subprocess
/// that uses the same `Envconfig`-based loader) round-trips its
/// parent's config byte-identically.
///
/// `Option`-typed fields are skipped on `None`, EXCEPT the six
/// per-request transient identity keys (`OBJECTIVEAI_AGENT_ID`,
/// `_FULL_ID`, `_REMOTE`, `_RESPONSE_ID`, `_RESPONSE_IDS`, and
/// `MCP_SESSION_ID`), which are `env_remove`'d on `None` so the
/// child cannot inherit a stale identity from the parent's startup
/// environment. Boolean fields are stamped only when `true`.
pub fn apply_config_env(cmd: &mut Command, cfg: &crate::Config) {
    if cfg.config_set_forbidden {
        cmd.env("CONFIG_SET_FORBIDDEN", "true");
    }
    if let Some(v) = cfg.objectiveai_dir.as_deref() {
        cmd.env("OBJECTIVEAI_DIR", v);
    }
    if let Some(v) = cfg.objectiveai_state.as_deref() {
        cmd.env("OBJECTIVEAI_STATE", v);
    }
    if let Some(v) = cfg.commit_author_name.as_deref() {
        cmd.env("COMMIT_AUTHOR_NAME", v);
    }
    if let Some(v) = cfg.commit_author_email.as_deref() {
        cmd.env("COMMIT_AUTHOR_EMAIL", v);
    }
    cmd.env("OBJECTIVEAI_AGENT_INSTANCE_HIERARCHY", &cfg.agent_instance_hierarchy);
    match cfg.agent_id.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_AGENT_ID", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_AGENT_ID");
        }
    }
    match cfg.agent_full_id.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_AGENT_FULL_ID", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_AGENT_FULL_ID");
        }
    }
    match cfg.agent_remote.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_AGENT_REMOTE", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_AGENT_REMOTE");
        }
    }
    match cfg.response_id.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_RESPONSE_ID", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_RESPONSE_ID");
        }
    }
    match cfg.response_ids.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_RESPONSE_IDS", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_RESPONSE_IDS");
        }
    }
    match cfg.mcp_session_id.as_deref() {
        Some(v) => {
            cmd.env(objectiveai_sdk::mcp::MCP_SESSION_ID_ENV, v);
        }
        None => {
            cmd.env_remove(objectiveai_sdk::mcp::MCP_SESSION_ID_ENV);
        }
    }
    // Plugin coordinate — set when a nested command is launched on
    // behalf of a plugin; removed otherwise so a child can't inherit a
    // stale plugin identity from the parent's startup environment.
    match cfg.plugin_owner.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_PLUGIN_OWNER", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_PLUGIN_OWNER");
        }
    }
    match cfg.plugin_repository.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_PLUGIN_REPOSITORY", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_PLUGIN_REPOSITORY");
        }
    }
    match cfg.plugin_version.as_deref() {
        Some(v) => {
            cmd.env("OBJECTIVEAI_PLUGIN_VERSION", v);
        }
        None => {
            cmd.env_remove("OBJECTIVEAI_PLUGIN_VERSION");
        }
    }
}