feat(client): report where a query was written - #89
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The server's advisor groups what it measures by the shape of the query, so its report can name a statement but not the place that wrote it: one line of Cypher usually has a dozen call sites. Built with debug_source_tracking, the client now sends the file, line and function each query was written at, and the report names the line instead. app_name and app_version ride along, naming the service when several share a database. The keys are the contract the Rust driver already speaks, and this fills the one it has to leave empty: it reads the caller through #[track_caller], and a Location carries no function name, while a Python frame does. Off by default and free while off: the flag gates the frame read itself, and the metadata argument is not passed at all, so a query makes the call it made before this existed. The frame is read directly rather than through inspect.stack, which walks the whole stack and opens each frame's source file to quote lines around it: file I/O per frame to answer a question about one of them. The synchronous client reads the location on the way in rather than inside the coroutine, because it hands that coroutine to an event loop and the frame that called it has returned by the time it runs. A query handed to create_task is past saving that way, so it reports nothing: what is left on the stack is an event-loop frame, and the advisor would collect the queries of every unrelated task under that one line, which is worse than silence.
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WalkthroughChangesQuery source tracking
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The opt-in tracking feature sends local source paths and application labels to the server with query metadata; confirm that this information is treated as untrusted observability data and is stored and exposed only within the intended tenant scope before merging. Sequence Diagram(s)sequenceDiagram
participant Caller
participant AsyncCoordinodeClient
participant _source
participant ExecuteCypher
Caller->>AsyncCoordinodeClient: cypher(query)
AsyncCoordinodeClient->>_source: capture caller location when tracking is enabled
_source-->>AsyncCoordinodeClient: source metadata
AsyncCoordinodeClient->>ExecuteCypher: ExecuteCypher(request, metadata)
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✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The implementation satisfies the coding objectives in [ ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Reading the location inside the coroutine only worked for a query that was awaited where it was written. Everything that runs a coroutine as a task starts the body long after the calling frame has returned, so create_task, gather, wait_for, shield and TaskGroup all reported an event-loop frame, which the call-site filter then discarded: concurrent queries, the ones most worth attributing, silently sent nothing. The query methods now read the location when they are CALLED, which is the one moment all of those share, and are plain methods returning a coroutine so there is such a moment at all. Two ways the aid could take a query down with it, both now closed. A path or function name outside ASCII went into a metadata key with no -bin suffix, which carries an HTTP/2 header value and must be ASCII; gRPC enforces that on the client, so the call failed before it was sent and the query never reached the server. A checkout under a non-ASCII path is enough to trigger it, and Python allows such a function name too. The values are escaped now, not dropped: an escaped path still names the file and still groups with itself, and dropping the file key alone would make the server discard the whole context anyway. The frame read caught only ValueError, the failure a stack shorter than the walk gives. An application whose audit hook refuses the sys._getframe event raises whatever it likes instead, and that escaped before the request was built. To a caller all of these are one thing — no location — and none is worth failing a query over. Carries a regression test per fix: the five scheduling wrappers, a location whose file, function and application name are all non-ASCII, and a frame read that raises. All were seen failing first.
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The previous escape covered the wrong range. gRPC refuses a control character in a metadata value exactly as it refuses a non-ASCII one, and 0x7f with them, but backslashreplace leaves all of those untouched: a newline, a tab or a NUL went out raw and failed the call before it was sent. So enabling source tracking could still be the reason every query fails, which is what the escape existed to prevent. The likeliest way in is mundane rather than exotic. An application name read from a file arrives with the newline that ended it, and a POSIX path may legally contain one. The bar is now printable ASCII, stated as a predicate rather than delegated to a codec whose range would have to be verified. Values that need nothing — every ordinary path and name — are returned unchanged after two scans, so the common path allocates nothing where it previously built a new string every time. Carries a regression test with a newline, a tab and a NUL across the file, function and application values, seen failing first. The escaped output was also put through grpc to confirm it now reaches the transport, where the raw one was rejected.
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…g call sites Two ways the previous round went wrong. Making the query methods plain methods returning a coroutine took the call site back from every scheduling wrapper, but it also changed the answer to a question callers ask: iscoroutinefunction said False. Code that dispatches on it broke, most consequentially create_autospec, which then built a synchronous double whose result a test cannot await. That happened with tracking off, so it fell on people not using the feature at all. The methods are now marked as standing in for the coroutine functions they replace, both ways, since the lever differs by version. The escaping was not injective, and for this feature that is not a lost detail but a wrong answer: the advisor groups by what it receives, so two call sites arriving as one string are reported as one place in the code, with the queries of one attributed to the other. A name holding a real newline came out as a name holding the four characters that spell its escape, and a character outside the basic plane came out as a character inside it followed by a digit. The escape character now escapes itself and each form is padded to a fixed width. Carries a regression test per defect, each seen failing first: both introspection predicates and an autospecced double that gets awaited, a newline against its literal spelling, and an astral character against a BMP one followed by a digit. The encoding was also brute-forced over an alphabet of the characters that trip it, three deep: no collisions, nothing outside the permitted range.
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Inline comments:
In `@coordinode/coordinode/client.py`:
- Around line 157-159: Update the coroutine decoration logic for both cypher
methods so inspect.iscoroutinefunction() returns true on Python 3.11 while
preserving call-site capture; replace the ineffective _is_coroutine fallback
with a compatible implementation, or explicitly raise the minimum supported
Python version to 3.12.
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…ines Marking a plain method as standing in for a coroutine function only worked from 3.12, where the marker is honoured. On 3.11 it reaches asyncio.iscoroutinefunction and therefore mock, but inspect.iscoroutinefunction has no such lever and answered False, which the tests caught there. The methods are coroutine functions again, and the location is read at the moment that serves both halves: attribute lookup. It happens in the caller's own frame, and it happens for every way of running the query, since create_task, gather, wait_for, shield and a TaskGroup all begin with `client.cypher(...)`. What the caller gets is a partial over the coroutine function, which inspect looks through, so the predicates are right on every supported version rather than on the newest ones. The signature is declared without self, because a descriptor that is not a plain function is not recognised as a method by create_autospec, which then leaves self in and binds the first real argument to it. With tracking off the lookup returns the ordinary bound method: no partial, no frame read, nothing. Verified on 3.11 as well as 3.12, since the version was the whole point: both predicates on the class, on a transaction and on a tracking instance, and an autospecced double that gets awaited.
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Rewriting the underlying function's signature to drop `self` was read again every time Python bound the method, taking the first remaining parameter off with it: `inspect.signature(client.cypher)` reported `params` first and no `query` at all, with tracking off as well as on. Anything inspecting a bound callable to validate arguments, inject dependencies or generate a wrapper would build that interface. The self-less signature exists for `create_autospec`, which reaches the method through the class, so it now lives on a separate object returned by class-level access only. The function every binding is derived from keeps its true signature. Carries a regression test on both bindings and on a transaction statement. Part of #78
Reading the call site when the method was looked up filed every query of a bound method kept for later under the one line that stored it: `run_query = client.cypher` followed by calls from a dozen places reported the assignment. Dependency injection and callback-style code hold on to a bound method routinely, so the advisor would merge exactly the call sites the feature exists to tell apart. The read moves into the call, which is the moment every path shares: `client.cypher(...)` evaluates in the caller's own frame whatever is then done with the coroutine, so scheduling it as a task still reports the caller and not the event loop. The coroutine contract holds because the wrapper derives from functools.partial, which the predicates unwrap. Carries a regression test for a saved method, and for two of its calls staying two distinct locations. Part of #78
create_text_index and drop_text_index reach the server through an internal cypher call, so the location read there was a frame inside this package: not a call site, discarded, and two public query paths left silently outside the per-query attribution the client advertises. Both helpers now read their own caller and pass it down to the statement, on the asynchronous and the synchronous client alike. Carries a regression test per helper on each client, and one holding the default path quiet. Part of #78
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Reading `f_code` raises its own `object.__getattr__` audit event, apart from the `sys._getframe` one, so a hardened application permitting the first and rejecting the second had the exception come out of the read — past the guard, and into a query that then failed rather than going out unattributed. A debugging aid must never be why a query fails, whichever of the two events the hook objects to. The extraction moves inside the guard that already covers getting the frame, which is the same nothing to a caller either way. Carries a regression test per refused attribute, and one for the query that still goes out. Part of #78
The unbound form — passing the instance in, as AsyncCoordinodeClient.cypher(client, "...") — reaches the method through the class and so bypasses the binding entirely. Nothing on the way in read the caller, and a client with tracking on sent that query with no location at all: quiet, since an unattributed query is also what every unreadable frame produces. It now reads its caller as well. From inside the coroutine, which is as early as this form allows and right for the direct await it is written as; scheduling this particular form as a task lands on an event-loop frame and is left unattributed rather than misattributed, as every unreadable location is here. Carries a regression test for the attributed call and for the default path staying silent. Part of #78
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Summary
The server's query advisor groups what it measures by the shape of the query,
so its report can name a statement but not the place that wrote it: one line of
Cypher usually has a dozen call sites. Built with source tracking, the client
sends the file, line and function each query was written at, and the report
names the line instead.
Decisions worth reviewing
Read out of the driver and the server rather than assumed, and three of them
depart from the issue's wording, which described a narrower feature than the
one the wire already speaks.
file:line. The contract incoordinode-client/src/source.rsisx-source-file,x-source-line,x-source-function,x-source-appandx-source-version, and the serverdiscards the whole source context when the file is missing. So the
application identity is sent with a location or not at all, and it needed
client options of its own, which the issue did not mention.
x-source-functionis the key this driver exists to fill. The Rustmodule says so itself: it reads the caller through
#[track_caller], and aLocationcarries no function name, so the key is left to the Python andTypeScript drivers. Parity here means supplying what Rust cannot, not
copying what it does.
inspect.stack(), which the issueproposed, walks every frame and opens each one's source file to quote the
lines around it: file I/O per frame to answer a question about one of them.
runs and not when it is looked up. Anything that schedules a coroutine as
a task —
create_task,gather,wait_for,shield, aTaskGroup—starts the body long after the calling frame has returned, and the
synchronous client hands its coroutine to a loop for the same reason.
Reading inside the body would name an event-loop frame for all of those,
which the advisor would fill with the queries of every unrelated task that
took that path. Reading at attribute lookup goes wrong the other way: a
bound method kept for later, as dependency injection and callback-style
code do routinely, is looked up once at the wiring and called from
everywhere afterwards, so every one of its queries would be filed under the
line that stored it. The call is the moment they all share — the call
expression evaluates in the caller's own frame whatever is then done with
the coroutine. The methods stay coroutine functions and what a caller gets
is a partial over one, which
inspectlooks through, soiscoroutinefunctionstill says yes andcreate_autospecstill buildsasync doubles on every supported version — 3.11 included, where a marker
would have reached
asynciobut notinspect. That answer is asked forwith tracking off too, so getting it wrong would fall on people not using
the feature. With tracking off the lookup returns the ordinary bound
method: no wrapper, no frame read.
create_autospecreaches a method through the class, and does not recognise a descriptor as
one, so it needs to be told the parameters without
self. Saying that byrewriting the underlying function's signature would have it read again on
every binding, taking
queryoff with it:inspect.signature(client.cypher)would advertise an interface the method does not have, to every framework
that inspects a bound callable. Class-level access therefore returns a
separate object carrying that signature, and the function every binding
derives from keeps its true one.
the server through an internal
cyphercall, so the location read therewould be a frame inside the package — not a call site, discarded — leaving
two public query paths outside the attribution the client advertises. Each
reads its own caller and passes it down.
two call sites arriving as one string would be reported as one place in the
code, with the queries of one attributed to the other. The escape character
escapes itself, and each form is padded to a fixed width, so neither a name
spelling an escape literally nor a character outside the basic plane can
collide with another name.
-binsuffix carries an HTTP/2 header value, and gRPC enforces the range on the
client, so an unescaped value would have failed every query instead of
attributing it. The bar is printable ASCII rather than ASCII: a newline, a
tab, a NUL and 0x7f are refused just as a non-ASCII character is, and the
likeliest source is mundane — an application name read from a file arrives
with the newline that ended it. Escaped rather than dropped: the path still
names the file and still groups with itself.
short stack raises
ValueError; an audit hook refusing thesys._getframeevent raises whatever it likes, and so does one refusing the separate
object.__getattr__event that reading the frame's ownf_coderaises —a hook can object to either. All of them are the same thing to a caller,
so the whole read is guarded, not just the part that obtains the frame.
AsyncCoordinodeClient.cypher(client, "…")— reaches the method throughthe class and bypasses the binding, so it reads its caller from inside the
coroutine instead. That is as early as this form allows and right for the
direct
awaitit is written as; scheduling this particular form as a tasklands on an event-loop frame and is left unattributed rather than
misattributed, which is what every unreadable location does here.
itself, and the metadata argument is omitted rather than passed empty, so a
query with tracking off makes exactly the call it made before this existed —
test doubles written against that signature keep working.
Testing
46 unit tests: the flag off (no frame read, no argument passed), the reported
line on all four paths that reach ExecuteCypher (async, sync, transaction,
sync transaction), the same line through each way of scheduling the query
(
create_task,gather,wait_for,TaskGroup, and a transactionstatement as a task), application identity present and absent, the frames
that are rejected as call sites including a sibling directory whose name
shares a prefix with the package, both introspection predicates and an
autospecced double that gets awaited, the key names, the range their values
stay inside (non-ASCII, and control characters separately), the two ways two
names could have collided, and the failure paths — a rejected query still
raises its own error, and a frame read that is unavailable or refused leaves
the query unattributed rather than failing it. Then the three the review
found:
querysurviving in the signature of a bound method, a saved boundmethod reporting each call rather than the assignment, the text-index
helpers reporting the line that called them, the unbound class form
reporting its caller, and a refused frame ATTRIBUTE leaving the query
unattributed instead of failing it.
The encoding was additionally brute-forced over an alphabet of the characters
that trip it, three deep: no collisions, nothing outside the permitted range.
The introspection predicates were checked on a real 3.11 as well as 3.12,
since which version answers them was the whole question.
Full suite: 287 unit tests green, ruff clean.
Closes #78