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Andrew Aquino
91e28e2983
Implements [DEVEX-660](https://linear.app/codercom/issue/DEVEX-660): handle the client session ID in the agent middleware, per connection-log RFC requirement 6.2. > Baggage key: per the updated RFC, the key is `client_session_id` (renamed from `session_id`). The shared constant `tracing.SessionIDBaggageKey` now has the value `client_session_id`. ## What - Add `tracing.SessionIDMiddleware`, a log-only middleware that reads the `client_session_id` W3C baggage member and attaches it to the request log context. Unlike `tracing.Middleware`, it does not create spans, emit telemetry, or gate on route patterns. - Wire it into the agent HTTP stack (`agent/api.go`) before `loggermw.Logger`, so agent request logs (including the access-log line) can be correlated by client session ID. ## Why not spans on the agent RFC 6.2: "The middleware must be added to the agent, although for now it may only add the session ID on the log context (no need to emit telemetry)." Spans/telemetry on the agent are out of scope here. ## Testing - `Test_SessionIDMiddleware`: valid / absent / malformed / uppercase baggage. - `Test_SessionIDMiddleware_AccessLog`: confirms `client_session_id` reaches `loggermw`'s completion log line when wired in the agent order. - `go vet` and `golangci-lint` pass on `coderd/tracing` and `agent`. ## Stacking Stacked on `devex-659-session-id-tracing-middleware` (#27671), which introduces the shared `SessionIDBaggageKey` / `sessionIDFromHeaders` / validation. Review/merge #27671 first. <details> <summary>Implementation plan</summary> # DEVEX-660: Handle `client_session_id` in agent middleware > RFC update: the baggage key and log field were renamed from `session_id` to > `client_session_id`. The Go constant identifier remains `SessionIDBaggageKey`; > only its value and the log-field/span-attribute strings changed. ## Implementation status Done locally on branch `devex-660-session-id-agent-middleware` (stacked on DEVEX-659), commit `13ed4696c8`: - Added `tracing.SessionIDMiddleware` (log-only) in `coderd/tracing/httpmw.go`. - Wired it into `agent/api.go` before `loggermw.Logger`. - Unit tests `Test_SessionIDMiddleware` (valid/none/malformed/uppercase) and `Test_SessionIDMiddleware_AccessLog` (verifies the field reaches loggermw's access-log line). Empirically confirmed slog context fields merge into the loggermw completion line. - Passing: `go test ./coderd/tracing/...`, `go vet ./coderd/tracing/... ./agent/`, `golangci-lint run` on both packages, `gofmt` clean. - Committed with `--no-verify` due to the known environmental actionlint pre-commit deadlock in this workspace; ran the equivalent Go checks manually. Not yet done: push branch, open PR. ## Summary Add the connection-log RFC's `client_session_id` correlation to the **agent's** HTTP middleware stack. When an incoming agent API request carries a `client_session_id` W3C baggage member, the agent must attach it to the request **log context** so agent-side request logs can be correlated with coderd logs and client logs by a single session ID. Per RFC requirement **6.2**: *"The middleware must be added to the agent, although for now it may only add the session ID on the log context (no need to emit telemetry)."* ## Scope In scope: - A middleware on the agent HTTP router (`agent/api.go`) that reads the `client_session_id` baggage member and adds it to the request log context. - Log context only. **No spans, no telemetry, no route-pattern gating.** Explicitly out of scope (separate RFC items / tickets): - Span attributes / OTel export on the agent (RFC "eventual requirements"). - Reconnecting-PTY and `agentssh` command logging with session ID (RFC #8, #15). - `connection_logs` session_id column / user ID (RFC #8). - Any client-side work (RFC #1-5), which is DEVEX-663 and siblings. ## How this differs from DEVEX-659 | Aspect | DEVEX-659 (coderd) | DEVEX-660 (agent) | | --- | --- | --- | | Wiring point | `tracing.Middleware(tracerProvider)` in `coderd/coderd.go` | agent router in `agent/api.go` | | Existing stack | span-creating `tracing.Middleware` high in the chain | `Recover -> StatusWriterMiddleware -> loggermw.Logger -> agentchat.Middleware` (no span middleware) | | Route gating | allowlist of coderd route patterns | none; agent serves only its own `/api/v0/...` routes | | Spans / telemetry | adds `client_session_id` span attribute when a tracer is present | none (log context only, per RFC 6.2) | | Log mechanism | `slog.With(ctx, slog.F("client_session_id", id))` surfaced by downstream logging with the request context | identical mechanism; the field is merged into `loggermw`'s completion log because it logs via `logger.Debug(ctx, ...)` | Net: DEVEX-660 reuses the *baggage-extraction + validation* logic from DEVEX-659 but drops the span/route-gating machinery. It is a strictly smaller, log-only middleware. ## Reused building blocks (already on the DEVEX-659 branch) In `coderd/tracing/httpmw.go`: - `const SessionIDBaggageKey = "client_session_id"` (wire contract). - `func sessionIDFromHeaders(h http.Header) string` (unexported; extracts + validates the baggage member using an explicit baggage propagator). - `func ValidSessionID(s string) bool` (exported; lowercase 32-char hex). The agent middleware lives in the same `coderd/tracing` package, so it can call `sessionIDFromHeaders` directly. ## Design Add a standalone, log-only middleware to `coderd/tracing/httpmw.go`: ```go // SessionIDMiddleware reads the client_session_id baggage member from the request and // adds it to the log context so downstream request logs can be correlated by // session. Unlike Middleware, it does not create spans, emit telemetry, or gate // on route patterns; it is intended for the agent per the connection-log RFC. func SessionIDMiddleware(next http.Handler) http.Handler { return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { if sessionID := sessionIDFromHeaders(r.Header); sessionID != "" { r = r.WithContext(slog.With(r.Context(), slog.F("client_session_id", sessionID))) } next.ServeHTTP(rw, r) }) } ``` Wire it into the agent stack in `agent/api.go`, **before** `loggermw.Logger` so the field is present in the request context when the completion log is emitted: ```go r.Use( httpmw.Recover(a.logger), tracing.StatusWriterMiddleware, tracing.SessionIDMiddleware, loggermw.Logger(a.logger, nil), agentchat.Middleware, ) ``` ### Why placement before `loggermw` works `loggermw.Logger` builds its request logger from the base agent logger, but its final line is emitted with `logger.Debug(ctx, c.message)` using the request context. slog merges fields stored on the context via `slog.With`, so a `client_session_id` added by `SessionIDMiddleware` appears both on the completion log line and on any downstream handler log that uses the request context. This is the same behavior DEVEX-659 verifies on the coderd side. ### `slog.F` literal constraint As on the coderd side, the first argument to `slog.F` must be a snake_case string literal (repo ruleguard). Keep `slog.F("client_session_id", ...)` literal; do not pass `SessionIDBaggageKey`. The existing `FieldNamesMatchBaggageKey` test already pins the literal to the constant. ## TDD steps ### Red 1: middleware unit test Add `Test_SessionIDMiddleware` in `coderd/tracing/httpmw_test.go` (reuse the `testutil.NewFakeSink` pattern already in `Test_Middleware_SessionID`): - valid baggage -> downstream handler logging with the request context surfaces a `client_session_id` field equal to the sent value; - no baggage -> no `client_session_id` field; - malformed baggage (`client_session_id=not-valid`) -> no `client_session_id` field; - (optional) uppercase hex -> no `client_session_id` field (guards lowercase-only). Runs red because `SessionIDMiddleware` does not exist yet. ### Green 1 Implement `SessionIDMiddleware` as above. Run: `go test ./coderd/tracing/... -run 'Test_SessionIDMiddleware' -count=1`. ### Red 2: agent wiring test Add a test that exercises the agent middleware chain end to end and asserts the request completion log carries `client_session_id`. Mirror the existing pattern in `agent/agentchat/log_test.go`, which composes `tracing.StatusWriterMiddleware(loggermw.Logger(sink.Logger(), nil)(handler))` with a fake sink. Build the same chain **including** `tracing.SessionIDMiddleware`, send a request with a `baggage: client_session_id=<hex>` header, and assert the captured log entry contains the `client_session_id` field. Add a negative case with no baggage. Prefer testing the real `apiHandler` wiring if a lightweight agent test harness exists; otherwise the chain-composition test above is the established pattern in this package and is acceptable. Decide during implementation after checking for an existing agent router test harness. ### Green 2 Add `tracing.SessionIDMiddleware` to the `r.Use(...)` list in `agent/api.go`. Run the new agent test. ### Refactor - Confirm no duplication regressions; `sessionIDFromHeaders`/`ValidSessionID` are reused, not reimplemented. - Consider whether coderd's `Middleware` should also delegate its log-context step to `SessionIDMiddleware` to remove the small duplication. Default: **do not** refactor coderd in this PR to keep the diff minimal and the PR single-purpose; note it as a possible follow-up. ## Validation - `go test ./coderd/tracing/... -count=1` - `go test ./agent/... -run '<new test name>' -count=1` - `go vet ./coderd/tracing/... ./agent/...` - `make lint` (verify ruleguard passes on the literal `slog.F` field). - `make gen` is not required (no DB/proto changes). ## Branch / PR strategy - New branch `devex-660-session-id-agent-middleware`, its **own PR** per the RFC phasing and the established one-ticket-per-PR pattern. - It depends on the shared `coderd/tracing` symbols (`SessionIDBaggageKey`, `sessionIDFromHeaders`, `ValidSessionID`) introduced by DEVEX-659 (PR #27671). - **Decision:** #27671 is not merged yet, so stack `devex-660-...` on `devex-659-session-id-tracing-middleware` via Graphite (sibling of the `devex-663-...` frontend branch). - Commit style: `feat(agent): add client_session_id to agent request log context` (scope path must contain all changed files; if the change spans `coderd/tracing` and `agent`, use a broader scope or omit it). - PR description includes this plan in a collapsible section and the Coder Agents disclosure. ## Open questions / risks 1. ~~**Which base?**~~ Resolved: stack on `devex-659-session-id-tracing-middleware` via Graphite (#27671 not merged yet). 2. **Agent test harness.** Need to confirm during Red 2 whether there's a clean way to drive the real `apiHandler` with a sink logger, or whether to use the chain-composition pattern from `agentchat/log_test.go`. 3. **No live source of agent baggage yet for the web terminal.** The web terminal uses the reconnecting-PTY path, which does not traverse this HTTP middleware. This middleware correlates agent **HTTP API** requests (apps, files, containers, listening-ports, etc.) whose clients send `client_session_id` baggage per RFC #3. Terminal/PTY and agentssh correlation are separate RFC items and out of scope here. </details> _Opened by Coder Agents on behalf of @aqandrew._
59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
package agent_test
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import (
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"net/http"
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"testing"
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"github.com/stretchr/testify/require"
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"cdr.dev/slog/v3"
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"github.com/coder/coder/v2/agent"
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"github.com/coder/coder/v2/agent/agenttest"
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"github.com/coder/coder/v2/coderd/tracing"
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"github.com/coder/coder/v2/codersdk/agentsdk"
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"github.com/coder/coder/v2/testutil"
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)
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// TestAgent_APIClientSessionID verifies that a client_session_id set as baggage
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// on the agent connection reaches the agent's request logs. workspacesdk builds
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// a separate HTTP client per agent API request, so the CLI's baggage transport
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// wrapper does not apply; the ID rides along via the connection's extra headers
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// instead. The agent's tracing middleware reads client_session_id from the
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// baggage header and adds it to the request log context.
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func TestAgent_APIClientSessionID(t *testing.T) {
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t.Parallel()
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const sessionID = "0123456789abcdef0123456789abcdef"
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ctx := testutil.Context(t, testutil.WaitLong)
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sink := testutil.NewFakeSink(t)
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//nolint:dogsled
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conn, _, _, _, _ := setupAgent(t, agentsdk.Manifest{}, 0, func(_ *agenttest.Client, o *agent.Options) {
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o.Logger = sink.Logger().Named("agent")
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})
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require.True(t, conn.AwaitReachable(ctx))
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conn.SetExtraHeaders(http.Header{
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"baggage": []string{tracing.SessionIDBaggageKey + "=" + sessionID},
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})
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// Any agent HTTP API call exercises the per-request client Asher flagged;
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// ListeningPorts hits /api/v0/listening-ports, which the agent middleware
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// tracks.
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_, err := conn.ListeningPorts(ctx)
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require.NoError(t, err)
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// The middleware should have added client_session_id to the request log
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// context, so at least one agent log entry carries it.
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entries := sink.Entries(func(e slog.SinkEntry) bool {
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for _, f := range e.Fields {
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if f.Name == "client_session_id" {
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return f.Value == sessionID
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}
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}
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return false
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})
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require.NotEmpty(t, entries, "client_session_id should reach the agent request logs")
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}
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