68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
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// Package echo provides the conformance fixture adapters.
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//
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// Two revisions over the same data: R-1 exposes only a collection, R-2 adds the
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// convenience resource. Both are ordinary deterministic HTTP handlers, which is
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// the point — an adapter is a normal service, and fluid-core sits in front of
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// it without asking anything of it.
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package echo
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import (
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"encoding/json"
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"net/http"
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"sort"
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"time"
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)
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// Entry is one record the fixture serves.
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type Entry struct {
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ID string `json:"id"`
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Title string `json:"title"`
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CreatedAt time.Time `json:"created_at"`
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}
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// Data returns a deterministic set of entries.
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//
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// Fixed timestamps rather than time.Now: a conformance suite whose fixture
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// changes between runs cannot distinguish a regression from the clock.
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func Data() []Entry {
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base := time.Date(2026, 9, 1, 12, 0, 0, 0, time.UTC)
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return []Entry{
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{ID: "e-1", Title: "the river reached the forge", CreatedAt: base},
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{ID: "e-2", Title: "nine doors stayed honest", CreatedAt: base.Add(24 * time.Hour)},
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{ID: "e-3", Title: "the reviewing side", CreatedAt: base.Add(48 * time.Hour)},
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}
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}
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// NewR1 returns the collection-only adapter.
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//
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// A consumer wanting the newest entry must fetch the whole collection, sort it
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// and discard the rest. That is the interface pressure the fixture generates.
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func NewR1() http.Handler {
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mux := http.NewServeMux()
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mux.HandleFunc("/v1/entries", func(w http.ResponseWriter, r *http.Request) {
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writeJSON(w, Data())
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})
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return mux
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}
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// NewR2 returns the adapter with the convenience resource added.
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func NewR2() http.Handler {
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mux := http.NewServeMux()
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mux.HandleFunc("/v1/entries", func(w http.ResponseWriter, r *http.Request) {
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writeJSON(w, Data())
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})
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mux.HandleFunc("/v1/entries/latest", func(w http.ResponseWriter, r *http.Request) {
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entries := Data()
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sort.Slice(entries, func(i, j int) bool {
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return entries[i].CreatedAt.After(entries[j].CreatedAt)
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})
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writeJSON(w, entries[0])
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})
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return mux
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}
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func writeJSON(w http.ResponseWriter, v any) {
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w.Header().Set("Content-Type", "application/json")
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_ = json.NewEncoder(w).Encode(v)
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}
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