fix(core): stop one bad ripgrep record from failing the whole search

packages/opencode/src/file/ripgrep-records.ts

@@ -0,0 +1,258 @@
+// altimate_change start — upstream_fix: ripgrep NDJSON record parsing, split out of ripgrep.ts.
+//
+// This lives in its own module rather than inside the `Ripgrep` namespace because it is pure,
+// process-free logic that deserves direct tests. Inside the namespace it was reachable only two
+// ways, both bad: projected through `export * as` as an implementation detail of the public
+// namespace, or driven through `search()` with a stub `rg` on PATH — and that binary lookup is
+// memoised per process, so such a stub leaks into every later test file in the same `bun test`
+// run and breaks unrelated suites.
+//
+// Module shape follows packages/opencode/AGENTS.md: flat top-level exports with a self-reexport at
+// the bottom, not `export namespace`.
+//
+// It mirrors packages/core/src/ripgrep.ts, but the two are not identical by design. The core parser
+// streams; this one buffers all of stdout before splitting, and hands its records straight to the
+// `/find` response. Both cap retained text, bound submatch counts, skip records they cannot use,
+// and report the skips once per search rather than once per record.
+import z from "zod"
+import { Log } from "@/util/log"
+
+const log = Log.create({ service: "ripgrep" })
+
+const Stats = z.object({
+  elapsed: z.object({
+    secs: z.number(),
+    nanos: z.number(),
+    human: z.string(),
+  }),
+  searches: z.number(),
+  searches_with_match: z.number(),
+  bytes_searched: z.number(),
+  bytes_printed: z.number(),
+  matched_lines: z.number(),
+  matches: z.number(),
+})
+
+const Begin = z.object({
+  type: z.literal("begin"),
+  data: z.object({
+    path: z.object({
+      text: z.string(),
+    }),
+  }),
+})
+
+export const Match = z.object({
+  type: z.literal("match"),
+  data: z.object({
+    path: z.object({
+      text: z.string(),
+    }),
+    lines: z.object({
+      text: z.string(),
+    }),
+    line_number: z.number(),
+    absolute_offset: z.number(),
+    submatches: z.array(
+      z.object({
+        match: z.object({
+          text: z.string(),
+        }),
+        start: z.number(),
+        end: z.number(),
+      }),
+    ),
+  }),
+})
+
+const End = z.object({
+  type: z.literal("end"),
+  data: z.object({
+    path: z.object({
+      text: z.string(),
+    }),
+    binary_offset: z.number().nullable(),
+    stats: Stats,
+  }),
+})
+
+const Summary = z.object({
+  type: z.literal("summary"),
+  data: z.object({
+    elapsed_total: z.object({
+      human: z.string(),
+      nanos: z.number(),
+      secs: z.number(),
+    }),
+    stats: Stats,
+  }),
+})
+
+const Result = z.union([Begin, Match, End, Summary])
+
+// Tolerating ripgrep's `{bytes}` arm and malformed lines. (The whole file is covered by the
+// marker at the top — this module is new, not an edit to upstream code.)
+//
+// This mirrors packages/core/src/ripgrep.ts, but deliberately not in every respect. That parser
+// streams, so it caps the retained line text and rebases submatch offsets; this one buffers all of
+// stdout up front and hands its records straight to the `/find` response, where the raw ripgrep
+// shape is the published contract — so it normalises and skips, and leaves the shape alone. Both
+// report skipped records once per search rather than once per record.
+// Linear canonical-base64 pre-filter. The earlier repeated-group expression
+// backtracked catastrophically on a large field: on Bun a canonical 4 MiB body
+// returned FALSE (valid data silently discarded) and on Node it raised
+// `RangeError`, which escaped and aborted the whole search. Length-mod-4
+// restores what the `{4}` grouping guaranteed; the round-trip check below is
+// what actually enforces canonical form. Mirrors packages/core/src/ripgrep.ts.
+const BASE64_SHAPE = /^[A-Za-z0-9+/]*={0,2}$/
+const isBase64 = (value: string) => value.length % 4 === 0 && BASE64_SHAPE.test(value)
+
+/** Mirrors packages/core/src/ripgrep.ts. Bounds parse cost per record on this path too. */
+const MAX_RECORD_BYTES = 16 * 1024 * 1024
+
+// Also mirrors core. Each submatch costs a rebase per endpoint, and a rebase allocates a string up
+// to the length of the line, so an unbounded submatch array turns one in-ceiling record into
+// O(count x line) work. A protocol change is exactly the shape that would emit one.
+const MAX_SUBMATCHES = 100
+
+// `MAX_RECORD_BYTES` bounds ONE input record; it does not bound what the response retains. This
+// path buffers all of stdout and returns every match, so without a per-field cap a tree of large
+// records still retains — and serialises into the `/find` response — an unbounded amount of text.
+// Same cap and elision marker as the core parser, so the two paths agree on what a match shows.
+const LINE_TEXT_CAP = 2_000
+const capText = (text: string) => (text.length > LINE_TEXT_CAP ? text.slice(0, LINE_TEXT_CAP) + "..." : text)
+
+/** Parse one NDJSON record, rewriting `{bytes: base64}` fields into the `{text}` arm. */
+const normalizeRecord = (line: string): unknown => {
+  let json: unknown
+  try {
+    json = JSON.parse(line)
+  } catch {
+    return undefined
+  }
+  if (!json || typeof json !== "object") return json
+  const read = (value: unknown, key: string): unknown =>
+    value !== null && typeof value === "object" && key in value ? Reflect.get(value, key) : undefined
+  const data = read(json, "data")
+  if (!data || typeof data !== "object") return json
+  /** Decode a `{text}`/`{bytes}` field, returning the raw buffer so offsets can be rebased. */
+  const decode = (value: unknown): { text: string; raw?: Buffer } | undefined => {
+    if (!value || typeof value !== "object") return undefined
+    const text = read(value, "text")
+    if (typeof text === "string") return { text }
+    const bytes = read(value, "bytes")
+    // Guarded three ways because `Buffer.from` decodes unconvertible input to an EMPTY buffer
+    // instead of throwing, which would turn a corrupt record into a schema-valid empty match:
+    // reject the empty string (a matched line is never empty), check the spelling, then require
+    // a round-trip so non-canonical padding ("Zh==" and "Zg==" both decode to "f") is rejected.
+    if (typeof bytes !== "string" || bytes.length === 0 || !isBase64(bytes)) return undefined
+    const decoded = Buffer.from(bytes, "base64")
+    if (decoded.toString("base64") !== bytes) return undefined
+    return { text: decoded.toString("utf8"), raw: decoded }
+  }
+  const lines = "lines" in data ? decode(read(data, "lines")) : undefined
+  // Submatch offsets are BYTE offsets into the RAW line, and a lossy decode widens every
+  // undecodable byte to a 3-byte U+FFFD — so they must be rebased onto the decoded text's own
+  // UTF-8 encoding or they no longer locate the match. This response shape is published by the
+  // `/find` route, so unrebased offsets would be newly wrong output rather than a skipped record.
+  // Mirrors packages/core/src/ripgrep.ts.
+  const raw = lines?.raw
+  // Byte-boundary validation, matching packages/core/src/ripgrep.ts. A decoded-string comparison
+  // is not sufficient: when an invalid byte precedes a LITERAL U+FFFD, an offset inside that
+  // character still yields a prefix that prefixes the line, because the replacement characters
+  // alias. A continuation byte (0b10xxxxxx) at the offset means the split lands inside a sequence.
+  // An offset that cannot be rebased drops ITS SUBMATCH, not the record — the file, line and text
+  // stay correct, and losing a highlight range beats losing the match.
+  const isContinuationByte = (byte: number | undefined) => byte !== undefined && (byte & 0xc0) === 0x80
+  // Encoded once per record and shared by every submatch; also supplies the byte length.
+  const textBytes = raw ?? (lines ? Buffer.from(lines.text, "utf8") : Buffer.alloc(0))
+  const rebase = (offset: unknown): number | undefined => {
+    // `{text}` arm: nothing is rebased, but the offset must still be addressable AND land on a
+    // character boundary — a byte offset can fall inside a multi-byte sequence (`éa`, offset 1
+    // splits `é`). `z.number()` rejects none of that, so a corrupt record would otherwise reach the
+    // `/find` response with coordinates that index nothing or half a character.
+    if (!raw)
+      return typeof offset === "number" &&
+        Number.isInteger(offset) &&
+        offset >= 0 &&
+        offset <= textBytes.length &&
+        !(offset !== 0 && offset !== textBytes.length && isContinuationByte(textBytes[offset]))
+        ? offset
+        : undefined
+    if (typeof offset !== "number" || !Number.isInteger(offset) || offset < 0 || offset > raw.length) return undefined
+    if (offset !== 0 && offset !== raw.length && isContinuationByte(raw[offset])) return undefined
+    return Buffer.byteLength(raw.subarray(0, offset).toString("utf8"), "utf8")
+  }
+  const submatches = read(data, "submatches")
+  // Only rewrite keys the record actually carries — `begin`/`end`/`summary` records reach here too
+  // and must keep their exact shape, or the strict union below would reject them.
+  // `path` is deliberately left alone: decoding it is lossy, and a path is an identifier the
+  // caller reopens, so a U+FFFD-mangled path names a file that does not exist. Such a record
+  // stays in the `{bytes}` arm and is skipped. See packages/core/src/ripgrep.ts.
+  const normalized = {
+    ...json,
+    data: {
+      ...data,
+      ...(lines ? { lines: { text: capText(lines.text) } } : {}),
+      ...(Array.isArray(submatches)
+        ? {
+            submatches: submatches.slice(0, MAX_SUBMATCHES).flatMap((submatch) => {
+              if (!submatch || typeof submatch !== "object") return [submatch]
+              const match = decode(read(submatch, "match"))
+              if (!match) return [submatch]
+              const start = rebase(read(submatch, "start"))
+              const end = rebase(read(submatch, "end"))
+              // Endpoints are rebased independently, so ordering is checked explicitly.
+              if (start === undefined || end === undefined || start > end) return []
+              return [{ ...submatch, match: { text: capText(match.text) }, start, end }]
+            }),
+          }
+        : {}),
+    },
+  }
+  return normalized
+}
+
+/**
+ * Turn ripgrep NDJSON lines into match data, skipping records that cannot be used.
+ *
+ * `JSON.parse` + a strict `Result.parse` on every line meant one unusable record threw out of
+ * `search()` and discarded every match already collected from unrelated files — the same defect
+ * fixed in packages/core/src/ripgrep.ts. Records are independent, so a bad one is dropped and
+ * counted. Pure and process-free, so `test/file/ripgrep-records.test.ts` drives it directly.
+ */
+export function parseRecords(lines: string[]): Match["data"][] {
+  const matches: Match["data"][] = []
+  let skipped = 0
+  for (const line of lines) {
+    // Bounds parse cost per record. This path buffers all of stdout before splitting, so it does
+    // not bound total memory — that needs streaming, tracked separately.
+    // `normalizeRecord` runs before `safeParse` and outside any try/catch of its
+    // own, so a throw inside it would escape `parseRecords` and take the whole
+    // search down — the failure mode this module exists to prevent.
+    let parsed: ReturnType<typeof Result.safeParse> | undefined
+    try {
+      parsed = Buffer.byteLength(line, "utf8") > MAX_RECORD_BYTES ? undefined : Result.safeParse(normalizeRecord(line))
+    } catch {
+      parsed = undefined
+    }
+    if (!parsed?.success) {
+      skipped++
+      continue
+    }
+    if (parsed.data.type === "match") matches.push(parsed.data.data)
+  }
+  // Counted and reported once rather than per record: without this a ripgrep protocol change
+  // would make `/find` answer `[]`, which is indistinguishable from an honest "no matches".
+  if (skipped > 0) log.warn("skipped unusable ripgrep records", { skipped, total: lines.length })
+  return matches
+}
+
+export type Result = z.infer<typeof Result>
+export type Match = z.infer<typeof Match>
+export type Begin = z.infer<typeof Begin>
+export type End = z.infer<typeof End>
+export type Summary = z.infer<typeof Summary>
+
+export * as RipgrepRecords from "./ripgrep-records"
+// altimate_change end