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chore: initial commit of Go API gateway
Baseline for the Kong replacement on api.riotpiao.com. Brings the working
tree under version control for the first time: gateway source, the task
board that drives the agent runs, test fixtures, and K8s manifests.

Anchor the gateway ignore rule to the repo root. Unanchored, "gateway"
also matched the cmd/gateway/ source directory, so the program entrypoint
was excluded from every commit.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
2026-08-19 20:54:34 -07:00

124 lines
3.5 KiB
Go

package testsupport
import (
"encoding/json"
"fmt"
"net/http"
"time"
)
// Stub response paths. testdata/config/harness.yaml points every upstream at the
// one stub server, so the response shape is selected by path, not by port.
const (
PathJSON = "/stub/json"
PathSSE = "/stub/sse"
PathChunked = "/stub/chunked"
PathSlow = "/stub/slow"
)
// SSEGap is the pause between SSE events. It exists so a test can observe that
// chunks arrive incrementally rather than all at once at the end.
const SSEGap = 20 * time.Millisecond
// SlowDelay is how long PathSlow waits before writing anything.
const SlowDelay = 250 * time.Millisecond
// SSETokens are the tokens PathSSE emits, one event per token, followed by the
// [DONE] sentinel that OpenAI-shaped clients expect.
var SSETokens = []string{"Hello", " ", "world", "!"}
// ChunkedBodies are the pieces PathChunked writes, each flushed separately so
// the response goes out with Transfer-Encoding: chunked.
var ChunkedBodies = []string{"first\n", "second\n", "third\n"}
// newStubHandler builds the mux served by the harness. Every handler writes a
// deterministic body so tests can assert on exact bytes.
func newStubHandler() http.Handler {
mux := http.NewServeMux()
mux.HandleFunc(PathJSON, stubJSON)
mux.HandleFunc(PathSSE, stubSSE)
mux.HandleFunc(PathChunked, stubChunked)
mux.HandleFunc(PathSlow, stubSlow)
return mux
}
// stubJSON serves a fixed JSON body.
func stubJSON(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
// Encode failure here means the client hung up mid-write; the connection is
// already gone, so there is nothing to report and no header left to change.
_ = json.NewEncoder(w).Encode(map[string]string{"status": "ok"})
}
// stubSSE streams one event per token, flushing after each. It returns early
// when the client disconnects, so a mid-response disconnect test can assert on
// how many tokens the upstream actually managed to emit.
func stubSSE(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Connection", "keep-alive")
w.WriteHeader(http.StatusOK)
rc := http.NewResponseController(w)
if err := rc.Flush(); err != nil {
return
}
for _, tok := range SSETokens {
select {
case <-r.Context().Done():
return
case <-time.After(SSEGap):
}
if _, err := fmt.Fprintf(w, "data: %s\n\n", tok); err != nil {
return
}
if err := rc.Flush(); err != nil {
return
}
}
if _, err := fmt.Fprint(w, "data: [DONE]\n\n"); err != nil {
return
}
_ = rc.Flush()
}
// stubChunked writes several pieces with a flush between each, producing a
// chunked transfer with no Content-Length.
func stubChunked(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(http.StatusOK)
rc := http.NewResponseController(w)
for _, body := range ChunkedBodies {
select {
case <-r.Context().Done():
return
case <-time.After(SSEGap):
}
if _, err := fmt.Fprint(w, body); err != nil {
return
}
if err := rc.Flush(); err != nil {
return
}
}
}
// stubSlow waits SlowDelay before responding at all, for timeout tests.
func stubSlow(w http.ResponseWriter, r *http.Request) {
select {
case <-r.Context().Done():
return
case <-time.After(SlowDelay):
}
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(http.StatusOK)
_, _ = fmt.Fprint(w, "slow\n")
}