| 1 | //! JSONL event log: every issue the CLI faces (panics, LLM failures and |
| 2 | //! retries, tool timeouts, cache resets) is appended as one JSON object per |
| 3 | //! line to `events.jsonl` next to the session database, so a crash is |
| 4 | //! diagnosable after the fact without having watched the terminal. |
| 5 | //! |
| 6 | //! Each line looks like: |
| 7 | //! ```json |
| 8 | //! {"ts":"2026-08-08T14:21:07.000Z","pid":1234,"level":"error","event":"llm.failed","provider":"opencode","model":"big-pickle","error":"..."} |
| 9 | //! ``` |
| 10 | //! |
| 11 | //! `init` also installs a panic hook, so even a hard crash lands in the log. |
| 12 | |
| 13 | use std::fs::OpenOptions |
| 14 | use std::io::Write |
| 15 | use std::path:: |
| 16 | use std::sync:: |
| 17 | |
| 18 | use serde_json::{Map |
| 19 | |
| 20 | pub const INFO: |
| 21 | pub const WARN: |
| 22 | pub const ERROR: |
| 23 | pub const PANIC: |
| 24 | |
| 25 | struct State { |
| 26 | path: PathBuf |
| 27 | pid: u32 |
| 28 | } |
| 29 | |
| 30 | static STATE: Mutex |
| 31 | |
| 32 | /// Where the event log lives: `<db dir>/events.jsonl` (the default DB is |
| 33 | /// `~/.wynba/agent.db`, so the log is `~/.wynba/events.jsonl`). |
| 34 | pub fn path_for(db_path |
| 35 | let dir = |
| 36 | dir.join("events.jsonl |
| 37 | } |
| 38 | |
| 39 | /// Turn on the event log and install the panic hook. Call once at startup, |
| 40 | /// before anything else can fail. Every `record` call before this is a no-op. |
| 41 | pub fn init(db_path |
| 42 | let state = |
| 43 | path: path_for(db_path |
| 44 | pid: std::process |
| 45 | }; |
| 46 | *STATE.lock(). |
| 47 | let prev = |
| 48 | std::panic::set_hook |
| 49 | let payload = |
| 50 | Some(s) |
| 51 | None => info |
| 52 | .payload() |
| 53 | .downcast_ref::<String |
| 54 | .cloned() |
| 55 | .unwrap_or_else(|| format! |
| 56 | }; |
| 57 | let location = |
| 58 | .location() |
| 59 | .map(|l| |
| 60 | .unwrap_or_else(|| "unknown |
| 61 | write_line( |
| 62 | PANIC, |
| 63 | "panic", |
| 64 | &[ |
| 65 | ("message", &payload |
| 66 | ("location", &location |
| 67 | ("panic_info", &format! |
| 68 | ], |
| 69 | ); |
| 70 | prev(info); |
| 71 | })); |
| 72 | } |
| 73 | |
| 74 | /// Append one event. `level` is one of INFO/WARN/ERROR/PANIC, `event` a short |
| 75 | /// machine-readable name (e.g. "llm.retry"), and `fields` arbitrary key/value |
| 76 | /// context (values are escaped as JSON strings). |
| 77 | pub fn record(level |
| 78 | write_line(level, event |
| 79 | } |
| 80 | |
| 81 | pub fn info(event |
| 82 | write_line(INFO, event |
| 83 | } |
| 84 | |
| 85 | pub fn warn(event |
| 86 | write_line(WARN, event |
| 87 | } |
| 88 | |
| 89 | pub fn error(event |
| 90 | write_line(ERROR, event |
| 91 | } |
| 92 | |
| 93 | fn write_line(level: |
| 94 | let state = |
| 95 | Ok(g) |
| 96 | Err(_) |
| 97 | }; |
| 98 | let Some( |
| 99 | return; |
| 100 | }; |
| 101 | let mut obj |
| 102 | obj.insert( |
| 103 | "ts".into(), |
| 104 | json!(chrono:: |
| 105 | ); |
| 106 | obj.insert("pid |
| 107 | obj.insert("level |
| 108 | obj.insert("event |
| 109 | for (k, v |
| 110 | obj.insert(k |
| 111 | } |
| 112 | let line = |
| 113 | if let Ok |
| 114 | let _ = |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | #[cfg(test)] |
| 119 | mod tests { |
| 120 | use super::*; |
| 121 | |
| 122 | // The global STATE is shared, so the event-log tests must run one at a |
| 123 | // time even under `cargo test` parallelism. |
| 124 | static TEST_LOCK: Mutex |
| 125 | |
| 126 | #[test] |
| 127 | fn records_append_valid_json_lines_to_log_file() { |
| 128 | let _guard = |
| 129 | let dir = |
| 130 | let db_path = |
| 131 | let log_path = |
| 132 | let _ = |
| 133 | init(&db_path); |
| 134 | info("hello.world", |
| 135 | error("boom", |
| 136 | let log = |
| 137 | let mut lines |
| 138 | let first: Value |
| 139 | assert_eq!(first[" |
| 140 | assert_eq!(first[" |
| 141 | assert_eq!(first[" |
| 142 | assert!(first[" |
| 143 | assert!(first[" |
| 144 | let second: Value |
| 145 | assert_eq!(second[" |
| 146 | assert_eq!(second[" |
| 147 | assert_eq!(second[" |
| 148 | assert!(lines.next |
| 149 | let _ = |
| 150 | } |
| 151 | |
| 152 | #[test] |
| 153 | fn no_op_before_init() { |
| 154 | let _guard = |
| 155 | let state = |
| 156 | error("nope", |
| 157 | assert!(STATE. |
| 158 | *STATE.lock(). |
| 159 | } |
| 160 | |
| 161 | #[test] |
| 162 | fn panic_hook_records_to_log() { |
| 163 | let _guard = |
| 164 | let dir = |
| 165 | let db_path = |
| 166 | let log_path = |
| 167 | let _ = |
| 168 | init(&db_path); |
| 169 | let _ = |
| 170 | let log = |
| 171 | let last: Value |
| 172 | assert_eq!(last[" |
| 173 | assert_eq!(last[" |
| 174 | assert!( |
| 175 | last["message"]. |
| 176 | "{last}" |
| 177 | ); |
| 178 | assert!(last[" |
| 179 | let _ = |
| 180 | } |
| 181 | } |