jcoffey-dev
6ee918d15f
Everything stays UTC: ingest still records Unix nanoseconds, ClickHouse
still stores UTC, every API response is still RFC3339 with a Z, and
queries are evaluated exactly as before. This changes only how those
instants are written on screen, so two people in two timezones looking
at one log line see the same instant written two ways -- never two
different lines, and never a different sort order.
Where the preference lives differs by deployment, and the three cases
are genuinely different products rather than one with fallbacks:
- Local login: server-side per named user (display_timezone on users,
PUT /auth/timezone), so it follows the person across browsers and
survives logout. Self-service at the RoleViewer floor, same as the
password change -- a viewer is the role most likely to be *only*
reading logs, so gating it higher would make it useless.
- Public demo: sessionStorage, so every new session starts at UTC. A
shared account's visitors have nothing to do with each other.
- Neither: localStorage, since there's no per-user record to write to.
api/cmd/api/main.go now imports time/tzdata. The image is
distroless/static with no /usr/share/zoneinfo, so LoadLocation would
otherwise reject every real zone name and the validation would refuse
every valid input.
Two details worth knowing when reading $lib/time.ts. Sub-second digits
are copied verbatim from the source string rather than round-tripped
through a JS Date, which is millisecond-precision and would silently
drop six digits of a ClickHouse nanosecond timestamp; expanding a result
row shows the localized value and the full-precision UTC original
together. And chart axes format their own labels, because ECharts'
type: 'time' axis renders in the browser's zone with no override --
which today puts a chart's clock out of step with the table beside it.
Timestamps are detected by value, not by column name: query output is
arbitrary, so a column called "timestamp" holding something else must
not be mangled, and `stats max(timestamp) as newest` must still be
formatted.
Verified against real zones including both sides of a DST boundary
(America/New_York at -05:00 in January, -04:00 in July), a half-hour
offset, and date rollover.
api
Cairn OBS's query API: a single POST /query endpoint accepting either the
pipe syntax or raw SQL, compiled and routed across ClickHouse and Tantivy
by internal/querylang. Replaces Phase 0/1's two separate placeholder
endpoints (raw-SQL-only /query, free-text-only /search) — see
/docs/query-language-design.md for the grammar, IR, and routing design,
and /docs/query-language-reference.md for the user-facing syntax.
Why plain REST, not gRPC + REST gateway
CLAUDE.md pins the control plane to "Go, gRPC + REST gateway." This
service is plain net/http instead — a deliberate simplification, not a
change to the pinned stack. Wiring up a .proto service,
google.api.http annotations, and protoc-gen-grpc-gateway codegen for
one endpoint doesn't buy much at this size. api does speak gRPC
internally — to /search — this simplification is about the
public-facing surface only.
Endpoint
POST /query — body {"query": "...", "language": ""}, response
{"columns": [...], "rows": [[...], ...]} or {"error": "..."}.
queryis either pipe syntax (service=api | where status>=500 | stats count by host) or raw SQL (SELECT ...). Auto-detected by whether the query starts withSELECT(case-insensitive).languageoptionally overrides detection:"sql"or"spl". Exists for the rare case a pipe query legitimately starts with the literal word "select" as a bare search term.- Both syntaxes compile to the same
querylang/ir.Planand execute through the same code path — seeinternal/querylang/executorfor the four routing cases (pure ClickHouse; Tantivy prefilter + ClickHouse rows; Tantivy prefilter + ClickHouse aggregation; raw SQL passthrough).
GET /healthz — for docker-compose/k8s liveness checks.
No auth. Not scoped yet — don't expose this beyond a trusted dev/homelab network.
Configuration
Environment variables (see internal/config/config.go):
| Var | Default | Purpose |
|---|---|---|
HTTP_LISTEN_ADDR |
:8080 |
|
CLICKHOUSE_ADDR |
localhost:9000 |
Native protocol port |
CLICKHOUSE_DATABASE / _USERNAME / _PASSWORD |
cairnobs / default / `` |
|
SEARCH_GRPC_ADDR |
localhost:50052 |
Must match /search's GRPC_LISTEN_ADDR |
QUERY_TIMEOUT_SECONDS |
30 |
Per-request timeout |
CORS_ALLOWED_ORIGIN |
* |
Wide open by default since there's no auth yet; tighten together |
searchclient.Dial connects to /search over plain TCP, no TLS — same
trust boundary as api's existing plain-TCP connection to ClickHouse.
mTLS in this project is specifically the agent↔ingest edge boundary, not
every internal hop.
Building & testing
go build ./...
go vet ./...
go test ./...
# from the repo root, not api/
docker build -f api/Dockerfile -t cairnobs-api .
Testing notes
internal/queryapi's HTTP handler depends on ClickHouse and /search
only through the narrow interfaces querylang/executor defines
(SQLRunner, SearchClient), so routing, compilation, JSON encoding,
and error-status mapping are all unit-tested against fakes — no live
ClickHouse or /search instance needed, and the real lexer/parser/
planner run unmocked in these tests, only the backends are faked. See
internal/querylang's own package docs for how compilation and
execution are tested independently of each other. executor.ChRunner
(the reflection-based row scanning against ClickHouse's driver.Rows)
and internal/searchclient's actual gRPC dial are not unit-tested — the
former because faking driver.Rows fully would be significant
test-only scaffolding the driver's own docs say isn't meant to be
implemented by adopters; the latter because it's a thin wrapper with
nothing but wiring to test. Both are exercised end-to-end via the
docker-compose flow in /docs/phase-2-runbook.md.