Add ghost serve: local web UI for running SQL against ghost databases#22
Add ghost serve: local web UI for running SQL against ghost databases#22murrayju wants to merge 39 commits into
ghost serve: local web UI for running SQL against ghost databases#22Conversation
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In case this is useful for review, I asked Claude to analyze the differences from the source 
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Stats around binary size change |
Step 1 of the ghost serve plan: a minimal Cobra command (gated behind GHOST_EXPERIMENTAL) that boots an in-process net/http server on a loopback interface, embeds a Vite/React placeholder via embed.FS, and proxies a single read-only ghost-api passthrough at /api/databases. What is here: - internal/cmd/serve.go - Cobra command with --port / --host / --no-open. - internal/serve/server.go - net/http mux, listener with OS-picked port, graceful shutdown on cmd.Context() cancel. - internal/serve/assets.go - embed.FS-backed asset handler with SPA fallback (no-extension -> index.html), Vite-style immutable cache for /assets/*, no-cache for index.html, plus a placeholder page when no UI bundle has been built. - internal/serve/bootstrap.go - /api/bootstrap returns projectId+version. - internal/serve/databases.go - /api/databases thin passthrough to ListDatabases. - web/ - Vite 7 + React 19 + Tailwind v3 + TanStack Query workspace. Header + DB picker stub; widget integration deferred to step 2. - bun - self-bootstrapping wrapper script (pinned to bun-v1.3.11), copied from ../ox. No new system dependencies for the build. - scripts/build-web.sh - runs bun install + bun run build, copies web/dist into internal/serve/web/ for the //go:embed directive. - check - invokes build-web.sh before go install. Query execution (executeQuery / arrowResults / sessions / cancel) lands in step 2 alongside the type-mapping port from popsql-query.
- bun does not honor --cwd as a global flag in front of `run`; rewrite
build-web.sh to cd into web/ instead.
- Pin @timescale/popsql-query-widget to 0.0.0-dev.156 (the latest
published canary; the package is not yet on a stable version line).
- Commit web/bun.lock and ignore web/tsconfig.tsbuildinfo.
Full Step 1 pipeline now validates end-to-end: scripts/build-web.sh
produces internal/serve/web/{index.html,assets/...} and the rebuilt
Go binary embeds + serves them with correct cache headers and SPA
fallback.
Step 2 of the ghost serve plan: in-process query execution that matches
the popsql-query-widget wire contract, no proxy to ghost-api or the
savannah gateway needed.
What is here:
internal/serve/dbtypes/
Ported verbatim from popsql-query/internal/types/. Custom scan
receivers that preserve database-side formatting and special values
(NaN, +/-Infinity, JSON, bytea hex, plain DATE/TIMESTAMP). GUID
(MSSQL-only) is dropped.
internal/serve/dbdriver/
Postgres-only port of popsql-query/internal/driver/. Provides:
- Driver/baseDriver interfaces and a Postgres adapter backed by
pgx/v5/stdlib so we get OID-aware ColumnType.ScanType().
- cancelContext, which wires pgConn.CancelRequest into the parent
context so query cancellation flows through pg_cancel_backend.
- NormalizedError shape matching the widget's failure type.
Drops the SSH tunnel, SSL custom-config, and multi-driver registry
(ghost only targets Timescale Postgres). Uses SimpleProtocol exec
mode so user-typed multi-statement SQL with comments works the same
way ghost sql does.
internal/serve/arrow.go
Ported from popsql-query/internal/writer/arrow.go. RecordBuilder
wraps array.RecordBuilder, appends the synthetic
__popsql_row_num__ column, and embeds the original column
descriptors in the schema metadata under __popsql_columns__ (both
contracts the widget's table renderer assumes).
internal/serve/wire.go
Request/response types matching what @popsql/query-client's
TimescaleQueryClient sends. The widget puts the SQL in a
`statements` array (not the legacy `query` field) so we read both.
internal/serve/store.go
In-memory run + session registries.
internal/serve/connect.go
Resolves database via ghost-api, runs CheckReady, fetches the
tsdbadmin password (with the same actionable error if missing), and
opens a pgx driver against the resulting DSN.
internal/serve/execute.go
POST /api/executeQuery (one-shot) and POST /api/executeSessionQuery.
Streams a single NDJSON columns line, blocks on Run.done while
arrowResults consumes the rows, then emits the success/error
terminator. Client disconnect cancels the underlying PG query.
internal/serve/arrow_results.go
POST /api/arrowResults. Streams an Apache Arrow IPC record batch per
1024 rows, then closes Run.done so executeQuery can finalize.
internal/serve/session.go
POST /api/createSession / sessionEvents (long-lived NDJSON status
stream) / closeSession. The widget's session manager retries
sessionEvents up to 15 times on disconnect, so transient hiccups
are handled for free.
internal/serve/cancel.go
POST /api/cancelRun -> pgConn.CancelRequest.
web/src/components/QueryPanel.tsx
Renders the unmodified popsql QueryWidget against the local server.
sessionKey is derived from the database ID so changing the picker
invalidates the session and the underlying PG connection.
web/vite.config.ts
- copyPopsqlQueryWidgetAssets plugin (ported from web-cloud) emits
the duckdb / monaco worker + wasm sidecars that the widget loads
via `new URL(<variable>, import.meta.url)` (Vite's static
analysis misses them).
- vite-plugin-node-polyfills shims Buffer / crypto / process /
stream — same list web-cloud uses with this widget.
- optimizeDeps.exclude on the widget so its workers resolve their
sibling chunks.
web/package.json
Pin React 18.3 (widget calls findDOMNode which is gone in React 19),
add @timescale/popsql-query-widget@0.0.0-dev.156 and
vite-plugin-node-polyfills.
End-to-end smoke-tested against a real Timescale Postgres database:
- SELECT 1; renders 1 row in the result table.
- SELECT 1::int, 'hello'::text, '2024-01-01'::date,
'2024-01-01 12:00:00+00'::timestamptz, 3.14::numeric,
'{"k":"v"}'::jsonb renders all six columns with the right types.
- Sessions: changing the DB picker invalidates the session and a
fresh connection opens transparently.
- Promote `ghost serve` to the public command surface (registered
unconditionally in root.go).
- Update CLAUDE.md to describe internal/serve/ + web/ alongside the
existing internal/{cmd,mcp,common,...} entries.
- Update README.md Commands table + Usage example.
- Regenerate docs/cli/ from cobra (adds docs/cli/ghost_serve.md and
the corresponding link in docs/cli/ghost.md).
- Add focused tests:
* internal/cmd/serve_test.go - asserts the not-logged-in error path
routes through App.GetClient like every other command.
* internal/serve/wire_test.go - covers the statements-vs-query
fallback for executeQueryRequest.SQL() plus the embedded-struct
decode path used by executeSessionQueryRequest.
* internal/serve/assets_test.go - exercises the placeholder
page (fresh checkout, no embedded UI) and, when a real bundle is
present, the SPA fallback + cache-control headers.
* internal/serve/store_test.go - runStore add/get/delete, Run
setError/closeDone idempotence, sessionStore.closeAll.
- Drop the favicon 404 (data: URL placeholder) and add name/aria-label
to the picker so the only remaining a11y warnings come from inside
the widget itself.
Both workflows now run scripts/build-web.sh (sourcing the @timescale/popsql-query-widget from GitHub Packages via the auto-provisioned secrets.GITHUB_TOKEN) before any go command, so the embedded bundle in internal/serve/web/ is populated when go build captures it via //go:embed. - test.yaml: runs the bundle build before `go mod tidy -diff` / `go build` / `go test` so coverage exercises the real asset handler (cache headers, SPA fallback, etc.) instead of the placeholder fallback. - release.yaml: runs the bundle build before goreleaser-action so every released binary embeds the production-built UI. The Dockerfile is left unchanged: in release mode it copies a pre-built binary, and the binary already has the bundle embedded. For local docker builds the placeholder kicks in as before.
…sult
Before this change, multi-statement input was joined with `; ` and sent
to pgx as a single Query call. pgx's stdlib wrapper only exposes the
first result set through database/sql, so editor content like
`CREATE TEMP TABLE t (...); INSERT ...; SELECT * FROM t` would show
the CREATE TABLE result (empty) instead of the user-relevant rows.
New behavior:
- Server iterates the widget's `statements` array on the same driver
connection, buffering each result set. Session state (TEMP tables,
GUCs, search_path, etc.) propagates across statements because
baseDriver pins a single sql.Conn per driver.
- The displayed result is the last result set that returned columns,
falling back to the last result set if none had columns (so DDL-only
runs still show their rowsAffected counter).
- The success NDJSON line carries `executedStatements: N` for any
caller that needs the count.
- The Vite app shows "Executed N statements" in the toolbar via the
widget's renderToolbarAppendLeft hook when N > 1, computed from the
editor text by an SQL-aware counter that skips comments, single- and
double-quoted regions, and dollar-quoted blocks.
- `runSelection={true}` plus `runButtonLabelWithSelection="Run selection"`
flips the button label automatically when the user has text selected
in the editor (widget-native behavior, ported from web-cloud).
Also marks Decimal128-for-NUMERIC as declined in plan.md (the costs
outweigh the UX benefits — see the plan for the full reasoning).
The widget's execute-query action itself does not clear the editor
selection — calling editor.trigger('keyboard', 'execute-query', null)
from a script leaves it intact. But pressing Cmd+Enter through a real
keyboard event somehow collapses the selection to the document start
during the native event flow (Monaco's keybinding service interaction,
suspected), only on this path; the Run button click is fine.
Workaround: install our own editor action with the same keybindings
via QueryPanel's editorPlugins. Monaco prefers the later-registered
action, so ours takes priority on Cmd+Enter. We snapshot the
selection, dispatch the widget's execute-query action via
editor.trigger (which doesn't trigger the misbehavior), then restore
the selection if it was non-empty. Net effect: Cmd+Enter now matches
the button-click behavior.
Move the default-selection logic into the databases queryFn so it runs when the query completes, and update the URL synchronously in the selection-change handler. Extracts the default-picking logic into pickDefaultDatabaseId.
The bun wrapper is only used to build the web workspace, so it belongs inside web/ rather than at the repo root. scripts/build-web.sh now calls ./bun from inside web/, and the bun download cache lives at web/download/.
The serve command was capturing the API client and project ID at startup and reusing them for the lifetime of the process. OAuth access tokens expire after about an hour, so a long-running server would start returning 401 from /api/databases (and every other API call) once that happened. Hold a *common.App reference instead and call app.Load(ctx) on each request that needs API access — same pattern the MCP server uses. Load re-runs refreshTokenIfNeeded, which renews the OAuth token via its refresh token and persists the new access token to disk.
The server's port is random by default, so localStorage (keyed by origin) isn't reliable for restoring UI state. Instead, persist via a small JSON file at <configDir>/serve-state.json behind GET/PUT /api/state. What's persisted: - selected database - editor height - editor SQL content
When the selected database is restored from saved state (no ?db= in URL), also write it back to the URL so the address bar reflects the actual selection.
Replaces the useEffect+isFirstSave debounce pattern with explicit setter actions that schedule a debounced PUT inline. URL ?db= sync also lives on the setter, so the URL and persisted state stay in lockstep. App still gates render on hydration so QueryWidget mounts with its final initial values.
The query widget now surfaces the worker's identifyCommands split on the onQueryComplete callback (via @timescale/popsql-query-widget 0.0.0-dev.157). Use that instead of our own countStatements walk, and drop the helper + the lastRunSQLRef bookkeeping that fed it.
Replace @timescale/popsql-query-widget@0.0.0-dev.158 with the new CDN
variant @timescale/popsql-query-widget-cdn@0.0.0-dev.161. The CDN variant
loads DuckDB-WASM (~73 MiB of duckdb-{eh,mvp}.wasm + their browser
workers) from cdn.jsdelivr.net at runtime instead of bundling them.
Net effect on the embedded ghost binary: internal/serve/web/ shrinks
from ~83 MiB to ~6 MiB, so each platform binary gains only ~9 MiB over
v0.18.0 instead of the ~85 MiB the original PR added.
Drop the popsqlQueryWidgetAssets() Vite plugin (the manual wasm copy +
mvp pruning it used to perform is no longer needed: the new widget
ships no wasm sidecars at all).
Binary size impact: v0.18.0 vs current PR headBuilt every
Each binary gains ~9.5 MiB of payload — almost entirely the |
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Pull request overview
Adds a new ghost serve CLI subcommand that runs a local HTTP server and serves an embedded React SPA for executing SQL against Ghost Postgres databases via the PopSQL query widget wire protocol (NDJSON + Arrow IPC).
Changes:
- Introduces
internal/serve/HTTP server with wire-protocol handlers, session/run stores, Postgres driver wrapper, and Arrow IPC encoding. - Adds a new
web/Vite+React app (Tailwind/Zustand/React Query) embedded into the Go binary via//go:embed, plus build scripts. - Updates docs, repo tooling, and CI workflows to build the web bundle before Go builds/tests/releases.
Reviewed changes
Copilot reviewed 54 out of 58 changed files in this pull request and generated 8 comments.
Show a summary per file
| File | Description |
|---|---|
| web/vite.config.ts | Vite dev proxy + polyfills config |
| web/tsconfig.json | TS compiler configuration |
| web/tailwind.config.ts | Tailwind content/theme config |
| web/src/styles.css | Tailwind directives |
| web/src/store.ts | UI state store + persistence PUT |
| web/src/main.tsx | SPA entry + React Query provider |
| web/src/components/QueryPanel.tsx | PopSQL widget wrapper panel |
| web/src/app.tsx | Bootstrap/databases fetching + layout |
| web/postcss.config.cjs | PostCSS Tailwind/autoprefixer |
| web/package.json | Web deps + bun scripts |
| web/index.html | SPA HTML shell |
| web/bun | Self-bootstrapping bun wrapper |
| web/biome.json | Biome formatter/linter rules |
| web/.npmrc.example | GitHub Packages auth template |
| web/.gitignore | Web build/artifact ignores |
| scripts/build-web.sh | Build SPA and stage for embed |
| README.md | Mentions ghost serve command |
| plan.md | Design/architecture plan document |
| internal/serve/wire.go | Widget request/response types |
| internal/serve/wire_test.go | Wire type tests |
| internal/serve/web/.gitkeep | Embed dir placeholder |
| internal/serve/store.go | In-memory run/session stores |
| internal/serve/store_test.go | Store tests |
| internal/serve/state.go | Persisted UI state file + handlers |
| internal/serve/session.go | Session lifecycle endpoints |
| internal/serve/server.go | HTTP server + routing |
| internal/serve/execute.go | Query execution + NDJSON stream |
| internal/serve/execute_test.go | Result-set selection tests |
| internal/serve/dbtypes/types.go | Custom scan type registry |
| internal/serve/dbtypes/numeric.go | NUMERIC JSON marshaling |
| internal/serve/dbtypes/json.go | Raw JSON scan/marshal |
| internal/serve/dbtypes/date.go | Date/time scan receivers |
| internal/serve/dbtypes/binary.go | BYTEA hex scan receiver |
| internal/serve/dbdriver/rows.go | Rows wrapper + column metadata |
| internal/serve/dbdriver/postgres.go | Postgres driver + cancel/error normalize |
| internal/serve/dbdriver/driver.go | Base driver abstractions |
| internal/serve/dbdriver/cancel.go | Server-side cancel context helper |
| internal/serve/dbdriver/api.go | Driver API + wire error types |
| internal/serve/databases.go | /api/databases passthrough |
| internal/serve/connect.go | Resolve DB + password + connect |
| internal/serve/cancel.go | /api/cancelRun handler |
| internal/serve/bootstrap.go | /api/bootstrap handler |
| internal/serve/assets.go | Embedded SPA asset handler |
| internal/serve/assets_test.go | Asset handler tests |
| internal/serve/arrow.go | Arrow schema + record building |
| internal/serve/arrow_results.go | Arrow IPC streaming endpoint |
| internal/cmd/serve.go | New ghost serve cobra command |
| internal/cmd/serve_test.go | Basic serve command test |
| internal/cmd/root.go | Registers serve command |
| go.mod | Adds Arrow + UUID deps |
| go.sum | Dependency lock updates |
| docs/cli/ghost.md | Adds serve to CLI index |
| docs/cli/ghost_serve.md | Generated serve command docs |
| CLAUDE.md | Documents new serve/web structure |
| check | Runs web build before Go tooling |
| .gitignore | Ignores web/build + embed artifacts |
| .github/workflows/test.yaml | Builds web bundle in CI tests |
| .github/workflows/release.yaml | Builds web bundle in releases |
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| case nil: | ||
| d = nil |
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Claude agreed that this was wrong, and I'm inclined to agree as well. @nathanjcochran would appreciate your thoughts, and whether to also apply to popsql-query. I'm guessing this code path is never exercised.
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Yeah, it's wrong. But I think you're right that this code path is never actually exercised.
The types we scan into are always pointers (see here), and when we call reflect.New() here to instantiate a value of that type, it returns a pointer to it. So we end up with pointers to pointers, which are what get passed to Scan() here. It's not well documented, but I think that if Scan is scanning NULL into a **T, it just sets the inner pointer to nil, and doesn't actually call the *T's custom Scan(src any) method. At least, I'm pretty sure that's the case, because our other custom types don't even handle nil (e.g. see here). So really, not handling nil at all is probably the correct approach. I'll make that change.
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Justin Murray <justin@murrayju.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Justin Murray <justin@murrayju.com>
Signed-off-by: Justin Murray <justin@tigerdata.com>
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Not really finished reviewing, but got through most of the popsql-query stuff and figured I'd leave some comments. The main things that are surprising to me are the things from popsql-query that were thrown out/omitted in favor of less-ideal designs (such as the fact that we're buffering all rows in memory now instead of streaming them to the caller, and the fact that the arrow record batch size is static now instead of dynamically adjusted in real-time 😕). I'd say it doesn't really matter much, but given that the original code we're copying already has (much) better solutions for these things, I'm not sure why we'd throw them out...
I also flagged a lot of things that are probably unnecessary now, but I don't actually have strong feelings on whether we get rid of them. Just figured I'd mention them in case you wanted to clean things up as much as possible. Also happy to take a crack at that later myself.
| // Metadata is reserved for future use; popsql-query's Metadata is only | ||
| // populated by BigQuery's bytes-processed counter. | ||
| type Metadata struct { | ||
| BytesProcessed int64 `json:"bytesProcessed"` | ||
| } |
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Can probably just get rid of this, since it was only used by BigQuery
| // ColumnCase controls how column names are presented to the widget. Today we | ||
| // always emit them as-is. | ||
| type ColumnCase string | ||
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| const ( | ||
| ColumnCaseDefault ColumnCase = "" | ||
| ColumnCaseLower ColumnCase = "lower" | ||
| ColumnCaseUpper ColumnCase = "upper" | ||
| ) |
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Can probably get rid of this. I think it was only used for Snowflake
| // ErrMultiStatement is returned when the user attempts to run multiple | ||
| // statements in a single query. Multi-statement support requires either an | ||
| // extended-protocol round trip per statement or pgx's "simple protocol" mode, | ||
| // which interpolates parameters client-side. For now we follow popsql-query's | ||
| // posture and reject the case. | ||
| var ErrMultiStatement = errors.New("cannot run multiple statements in a single query") |
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Just to add some color here: popsql-query does support multiple statements now, but it relies on them being parsed by the front-end and sent as an array of statements in the Statements request field. It just can't be done in a single query (which is what this error protects against).
| // The reason for the not-a-child context is so that pgx does not abort the | ||
| // query mid-flight on its own — we want a graceful cancel through Postgres, | ||
| // so we can still surface a useful error to the client. |
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This isn't quite accurate. The real reason is because pgx responds to context cancellation by closing the database connection, which aborts the session, meaning subsequent queries don't happen within the same session context. I forget the exact reason for this pgx behavior, but I think there are old GitHub issues discussing it. In any case, by capturing the context cancellation and handling it ourselves by issuing a "normal" query cancellation via the wire protocol, we can keep the connection open so that subsequent queries operate within the same session.
| // QueryArgs is the input to Driver.Query. | ||
| type QueryArgs struct { | ||
| Query string | ||
| ColumnCase ColumnCase | ||
| } |
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Could probably get rid of this struct entirely and make the Query() function just take a query string parameter instead (I think that's what it originally did, before I had to add support for some other options related to other drivers - but I don't think they're necessarily relevant for Postgres).
| // precision and special values (NaN, +/-Infinity, untyped JSON, hex-encoded | ||
| // bytea, plain DATE/TIMESTAMP strings) when reading rows out of database/sql. | ||
| // | ||
| // Ported from github.com/timescale/popsql-query/internal/types so the Apache |
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We probably shouldn't leave explicit references to popsql-query (an internal private repo) in this public repo. There are a number of references like this in comments scattered throughout.
| } | ||
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| func (rb *RecordBuilder) RecordRowCount() int64 { return rb.recordRowCount } | ||
| func (rb *RecordBuilder) TotalRowCount() int64 { return rb.totalRowCount } |
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This function appears to be unused. Not sure why Claude decided to add it.
| func (s *Server) handleArrowResults(w http.ResponseWriter, r *http.Request) { | ||
| var req arrowResultsRequest | ||
| if err := json.NewDecoder(r.Body).Decode(&req); err != nil { | ||
| http.Error(w, "invalid request body: "+err.Error(), http.StatusBadRequest) |
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popsql-query used to return well-structured JSON errors, which the front-end knew how to parse. It looks like this is just returning plain text errors now. Why the change?
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No idea, I wasn't consulted 😓. I'm guessing that it didn't really review the popsql-node code all that much, and just decided this was simpler.
| defer ipcWriter.Close() | ||
| defer run.closeDone() | ||
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| for _, row := range run.bufferedRows { |
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The fact that it buffers all result rows is memory is a major regression in the design. The original would stream rows over a channel, and backpressure ensured that memory usage remained low. This has the potential to use up lots of memory on the user's machine for large result sets, and also means it will take longer for users to see the first row (since they all get loaded into memory before any get returned to the user). Not sure why the change in design, given that it's just objectively worse now 😕.
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Yeah... I'd very much like to preserve the original design.
| if rb.RecordRowCount() >= arrowBatchRows { | ||
| if err := flushBatch(ipcWriter, rb, w); err != nil { | ||
| run.setError(&dbdriver.NormalizedError{Message: err.Error(), Source: "ghost"}) | ||
| return | ||
| } | ||
| } |
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The original had much more sophisticated logic for dynamically determining the ideal arrow record batch size (see here). Again, the main benefit was limiting massive memory spikes, but it also helped ensure a fast time-to-first-byte. That all appears to have been thrown out in favor of a simple static batch size 😕.
| run := s.runs.get(req.RunID) | ||
| if run == nil { | ||
| http.NotFound(w, r) | ||
| return | ||
| } | ||
| // Wait for runQuery to finish buffering. Guard on the request context so a | ||
| // stray/duplicate arrowResults POST for a run that errored before ready was | ||
| // closed (e.g. the bufErr path in runQuery) doesn't block this handler | ||
| // indefinitely. | ||
| select { | ||
| case <-run.ready: | ||
| case <-r.Context().Done(): | ||
| return | ||
| } |
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Not sure why this changed, but it doesn't appear to have the same safety against concurrent callers as the original code.
EDIT: seems to be related to the changes from popsql-query's writer package, and buffering rows in memory, etc.
| return &connectErr{ | ||
| norm: &dbdriver.NormalizedError{ | ||
| Message: fmt.Sprintf(format, args...), | ||
| Source: "ghost", |
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The source field usually holds the client type (i.e. postgresql). I know it's a required field on the corresponding popsql NormalizedError type definition, but I honestly don't remember what it's used for, or if stuffing ghost in there would have any adverse effects.
| // pickResultSetToSurface picks the result set we display to the widget, | ||
| // matching the rule the user asked for: prefer the last result set that | ||
| // returned columns; fall back to the last result set if none have columns; | ||
| // nil if the slice is empty. | ||
| func pickResultSetToSurface(results []bufferedResultSet) *bufferedResultSet { | ||
| if len(results) == 0 { | ||
| return nil | ||
| } | ||
| for i := len(results) - 1; i >= 0; i-- { | ||
| if len(results[i].columns) > 0 { | ||
| return &results[i] | ||
| } | ||
| } | ||
| return &results[len(results)-1] | ||
| } |
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I assume this is probably the reason that all rows are being buffered in memory now. There is no way, in principal, to know which is "the last result set that returned columns" before you've iterated through all the result sets and checked. And that requires buffering them in memory, so you can return whichever ends up being the last one with columns. Presumably, this is something you asked for, and it led Claude to make this change?
Fwiw, the way popsql-query did it was just to throw away the result sets for all statements except the last, and stream the last result set to the client in real-time (whether or not it had columns/rows). I think that's probably the only way to do this that doesn't require either buffering all result sets in memory, or streaming all result sets to the client. And I honestly think it's the more correct behavior anyways, because even if the final statement doesn't return columns/rows, it might still return a command tag that indicates what happened. And without that, I think a lot of users might assume their final statement wasn't executed for some reason.
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Yeah, I think you are right. I didn't explicitly ask for it to look for the last statement with columns, I just asked it to wire up support for multiple statements. It came up with that requirement on its own 😓
The initial port of the query backend into `ghost serve` introduced several regressions vs. the original upstream code. This restores the original design where it was changed, and trims only what isn't needed for Postgres-only support. Streaming / memory (the important ones): - Stream rows over a backpressured channel instead of buffering the entire result set in memory. A dedicated query goroutine (streamQuery) scans rows and hands them to handleArrowResults, which writes them straight to the Arrow IPC stream. Memory stays flat for large results and time-to-first-byte is fast again. Multi-statement runs execute prior statements fire-and-forget on the same connection, then stream the final statement (matching upstream). - Restore adaptive Arrow record-batch sizing (initial 100 rows, 5 MiB target, min 5 / max 10000, 2x growth cap) instead of a static 1024-row batch. - Revert the Postgres connection to the extended query protocol (drop the simple-protocol override, which had downsides and wasn't actually needed). - Return structured JSON errors from the widget-facing handlers so the widget's checkApiError can surface the message (plain text was discarded). - Guard arrowResults against concurrent consumers (single-reader, like the original pipe). Cleanups / parity: - Log previously-swallowed Close()/rows errors via a slog logger (like ghost mcp), rather than dropping them. - Remove Postgres-irrelevant adapter code: ColumnCase (Snowflake), Metadata (BigQuery), the QueryArgs struct (Query now takes a string), the unused TotalRowCount method, and the dead SQL() join helper. - Remove the unnecessary RuntimeParams nil-check. - Correct the cancel.go and ErrMultiStatement comments, and drop references to private internal repos from the source comments. - Clarify the timestamptz offset layout: "-07" is Go's signed-offset token (the "-" is the sign placeholder), not a double sign. The code is correct. Tests: rewrite execute_test.go to exercise the streaming path end-to-end with a fake driver (single + multi-statement, concurrent-consumer guard) and add arrow_results_test.go for the adaptive batch sizing. Passes go test -race.
Overview
Adds
ghost serve, a CLI command that opens a local web UI for running SQL against your ghost databases.Demo
https://zoom.us/clips/share/UE3nq3DDToyIlXDHptkxEQ
How it's built
The goal was to stand up a working query experience with as little new UI / wire-protocol / driver code as possible. The heavy lifting comes from two existing pieces, stitched together here:
@timescale/popsql-query-widget-cdn— the entire query experience (Monaco editor, run controls, results grid, history sidebar). This is the CDN variant of the widget: it lazily loads its DuckDB-WASM result-cache runtime (~73 MiB ofduckdb-eh.wasm+ browser worker) fromcdn.jsdelivr.net/npm/@duckdb/duckdb-wasmthe first time a query runs, so those assets don't have to be bundled into the ghost binary.Frontend
projectId,serviceId,sessionKey, etc.). The built SPA is embedded into the Go binary via//go:embed./api/stateendpoint backed by a JSON file in~/.config/ghost/. localStorage isn't usable because the listen port is random by default and localStorage is keyed by origin.Backend
Rather than proxy queries through ghost-api, the widget's wire endpoints (
/api/executeQuery,/api/arrowResults, sessions, cancel) run in-process, hitting Postgres directly viapgx/v5.internal/serve/dbdriver/+dbtypes/are slim, Postgres-only ports of the upstream driver packages (OID-aware scan types, custom receivers for Date / Numeric / JSON, server-side cancellation, error normalization). Multi-driver machinery that only existed for other adapters (Snowflake column-casing, BigQuery metadata, the per-call options struct) has been dropped.internal/serve/arrow.gois a port of the upstream Arrow IPC writer.streamQuery) scans rows and hands them, one at a time, to the/api/arrowResultshandler over a small buffered channel. That handler converts them straight into Arrow IPC record batches and writes them to the wire. Backpressure on the channel keeps memory flat for arbitrarily large result sets — rows are never collected in full — and the batch size adapts in real time (small first batch for fast time-to-first-byte, growing toward a ~5 MiB target). This preserves the upstream streaming design.Query.common.App.Loadpattern the MCP server uses, so a long-running serve session doesn't get stuck with an expired OAuth token.ghost mcp, the server logs diagnostics (e.g. connection-close errors) to stderr viaslog.What's actually new in this PR
ghost serveCobra command, the React shell, the Zustand store, and the state file.executeQueryNDJSON + concurrentarrowResultsArrow stream), the per-statement execution loop, the simple session manager, and the Cmd+Enter selection preservation plugin.read_onlyconfig when executing queries (same asghost sql/psql/MCP), so a read-only user can't issue writes through the web UI.Binary size
Each platform binary grows by ~9.5 MiB over v0.18.0 (the embedded SPA is ~6.4 MiB; the rest is the Go side picking up workers / dbdriver / arrow / etc.). DuckDB-WASM itself is loaded from CDN at query time and is not part of the binary. See the size-comparison comment for the full per-platform table.
Trying it out
Picks a free port, opens your browser, lets you run SQL.
--no-openskips the browser,--port Npins a port.