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App 2.39.1, server 2.8.0: map roads from OpenFreeMap, on demand

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The public Overpass answered 429/502 and needs ~40 s a tile while the
car gives up after 8 s, so the server cancelled its queries and the
car's retries added load. Now the server fetches only the tiles a car
asks for, as OpenStreetMap vector tiles from OpenFreeMap (MAP_TILES_URL),
decodes the transportation layer with a small reader of its own, and
keeps each tile 30 days on a volume (MAP_CACHE_DIR). A fetch finishes
even after the car has stopped waiting; the car hears 503 with
Retry-After and gets the tile on its next try.

App: OpenFreeMap/OpenMapTiles attribution on the map, retry after 15 s.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6
This commit is contained in:
nils
2026-10-26 23:54:30 +01:00
co-authored by Claude Opus 5.5
parent d9c7c5ea9a
commit 6be2ba5193
17 changed files with 891 additions and 332 deletions
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server/main.go
+19 -11
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@@ -34,7 +34,8 @@ type config struct {
forgeURL string
forgeRepo string
forgeToken string
overpassURL string
mapTilesURL string
mapCacheDir string
}
// loadConfig reads the environment and fails closed: a missing InfluxDB setting or a
@@ -52,7 +53,8 @@ func loadConfig(getenv func(string) string) (config, error) {
forgeURL: getenv("FORGE_URL"),
forgeRepo: getenv("FORGE_REPO"),
forgeToken: getenv("FORGE_TOKEN"),
overpassURL: getenv("OVERPASS_URL"),
mapTilesURL: getenv("MAP_TILES_URL"),
mapCacheDir: getenv("MAP_CACHE_DIR"),
}
if c.listenAddr == "" {
c.listenAddr = ":8080"
@@ -75,16 +77,16 @@ func loadConfig(getenv func(string) string) (config, error) {
if c.forgeURL != "" && !strings.HasPrefix(c.forgeURL, "https://") {
return config{}, errors.New("FORGE_URL must be an https URL")
}
// The map's roads come from an Overpass API: the public one unless another is named, none
// with "off". Only https, like the forge.
switch c.overpassURL {
// The map's roads come from vector tiles named by a TileJSON: OpenFreeMap unless another is
// named, none with "off". Only https, like the forge.
switch c.mapTilesURL {
case "":
c.overpassURL = DefaultOverpassURL
c.mapTilesURL = DefaultMapTilesURL
case "off":
c.overpassURL = ""
c.mapTilesURL = ""
default:
if !strings.HasPrefix(c.overpassURL, "https://") {
return config{}, errors.New("OVERPASS_URL must be an https URL or \"off\"")
if !strings.HasPrefix(c.mapTilesURL, "https://") {
return config{}, errors.New("MAP_TILES_URL must be an https URL or \"off\"")
}
}
if c.approvalPass != "" && len(c.approvalPass) < minApprovalPasswordLength {
@@ -116,8 +118,14 @@ func main() {
releases := &Releases{ForgeURL: cfg.forgeURL, Repo: cfg.forgeRepo, Token: cfg.forgeToken}
api := &API{Store: store, IngestToken: cfg.ingestToken, Pairing: pairing, Handoff: NewHandoff(),
Releases: releases, PublicURL: cfg.publicURL}
if cfg.overpassURL != "" {
api.Maps = NewMaps(cfg.overpassURL, mapUserAgent)
if cfg.mapTilesURL != "" {
if cfg.mapCacheDir != "" {
if err := os.MkdirAll(cfg.mapCacheDir, 0o700); err != nil {
slog.Error("map cache directory not usable", "error", err)
os.Exit(1)
}
}
api.Maps = NewMaps(cfg.mapTilesURL, cfg.mapCacheDir, mapUserAgent)
}
srv := &http.Server{