addrkit: deterministic address resolution service (Go)

- domain: address normalization/parsing, matching with explicit statuses
- adapters: SQLite registry store, ArcGIS outages client, optional LLM rewriter, HTTP API
- seed pipeline with duplicate handling and unparsed reporting
- CLI (seed/verify/resolve), systemd unit, OpenAPI contract, tests
This commit is contained in:
Maksim Totmin
2026-10-09 21:40:46 +07:00
commit 7b152c7fb3
34 changed files with 3446 additions and 0 deletions
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package address
import (
"strings"
"unicode"
"golang.org/x/text/cases"
"golang.org/x/text/unicode/norm"
)
// fold is a Unicode-aware case folder. It lower-cases Cyrillic and Latin
// alike, which is what we want for matching.
var fold = cases.Fold()
// NormalizeText folds a free-form string into a canonical form suitable for
// parsing and matching.
//
// The transformation is intentionally lossy:
// - Unicode NFKC (so lookalike characters collapse);
// - case folding (so "СТАНИЦИОННАЯ" == "станционная");
// - "ё" -> "е" (users and ASR disagree about the diaeresis);
// - dashes and various Unicode spaces are unified;
// - punctuation that only separates tokens becomes a space;
// - runs of whitespace collapse to a single space.
//
// NormalizeText is idempotent: NormalizeText(NormalizeText(s)) == NormalizeText(s).
func NormalizeText(s string) string {
s = norm.NFKC.String(s)
s = fold.String(s)
s = strings.ReplaceAll(s, "ё", "е")
s = mapSeparators(s)
s = strings.Join(strings.Fields(s), " ")
return strings.TrimSpace(s)
}
// mapSeparators unifies characters that carry no semantic meaning for address
// matching. It never removes digits, letters or the '/' house separator.
func mapSeparators(s string) string {
var b strings.Builder
b.Grow(len(s))
for _, r := range s {
switch {
case r == '\u00a0' || unicode.IsSpace(r):
b.WriteByte(' ')
case isDash(r):
b.WriteByte('-')
case isSeparatorPunct(r):
b.WriteByte(' ')
default:
b.WriteRune(r)
}
}
return b.String()
}
// isDash reports whether r is one of the many dash-like code points that users
// and copy-paste bring in: "2–я" with an en dash is still an ordinal.
func isDash(r rune) bool {
switch r {
case '-', '\u2010', '\u2011', '\u2012', '\u2013', '\u2014', '\u2212':
return true
default:
return false
}
}
// isSeparatorPunct reports whether r separates tokens. Dots are included so
// that abbreviations like "ул." normalize to their stem ("ул").
func isSeparatorPunct(r rune) bool {
switch r {
case '.', ',', ';', '(', ')', '"', '\'', '«', '»', ':', '!', '?':
return true
default:
return false
}
}
// isDigits reports whether s is a non-empty run of ASCII digits.
func isDigits(s string) bool {
if s == "" {
return false
}
for _, r := range s {
if r < '0' || r > '9' {
return false
}
}
return true
}
// trimLeadingZeros removes redundant leading zeros from a numeric token:
// "007" -> "7". It leaves non-numeric strings untouched.
func trimLeadingZeros(s string) string {
if !isDigits(s) {
return s
}
t := strings.TrimLeft(s, "0")
if t == "" {
return "0"
}
return t
}
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package address
import (
"regexp"
"sort"
"strings"
)
// The house block is parsed from the end of the string, component by
// component, from the outermost (structure) to the innermost (house). Working
// right-to-left is what lets us tell a genuine house number apart from a digit
// that is part of the street name (e.g. "2-я Станционная улица 1/1 стр.").
var (
// "... стр." / "... строение 3" / "... сооружение" / "... с 2"
reStructure = regexp.MustCompile(`(?:^|\s)(?:стр|строение|сооружение|с)\.?\s*(\d+)?$`)
// "... к9/1" / "... корпус 2а" / "... кД" / "... к 1/4"
reBuilding = regexp.MustCompile(`(?:^|\s)(?:к|корп|корпус)\.?\s*(\d*)\s*([а-я])?(?:/(\d+)\s*([а-я])?)?$`)
// "... 1/1" / "... 33а" / "... 12 б" / "... 45а/4" / "... 1/1а"
reHouse = regexp.MustCompile(`(?:^|\s)(\d+)\s*([а-я])?(?:/(\d+)\s*([а-я])?)?$`)
// "2-я", "10-й", "3-е"
reOrdinalToken = regexp.MustCompile(`^(\d+)-[а-я]{1,3}$`)
)
// Parse decomposes a free-form address into its structured components. It is
// total: unparseable input still yields a non-nil ParsedAddress whose street
// part is best-effort and whose HasHouse is false.
func Parse(raw string) ParsedAddress {
normalized := NormalizeText(raw)
p := ParsedAddress{Raw: raw, Normalized: normalized}
rest := normalized
if g, start, ok := matchSuffix(reStructure, rest); ok {
p.Structure = trimLeadingZeros(g[1])
rest = strings.TrimSpace(rest[:start])
}
if g, start, ok := matchSuffix(reBuilding, rest); ok {
// The regex also matches a bare "к"; only accept it when a digit or a
// letter actually follows, otherwise it is not a corpus marker.
if g[1] != "" || g[2] != "" {
p.Building = trimLeadingZeros(g[1])
p.BuildingLetter = firstNonEmpty(g[2], g[4])
p.BuildingFrac = trimLeadingZeros(g[3])
rest = strings.TrimSpace(rest[:start])
}
}
if g, start, ok := matchSuffix(reHouse, rest); ok {
p.House = trimLeadingZeros(g[1])
p.HouseLetter = firstNonEmpty(g[2], g[4])
p.HouseFrac = trimLeadingZeros(g[3])
p.HasHouse = true
rest = strings.TrimSpace(rest[:start])
}
parseStreet(&p, rest)
return p
}
// firstNonEmpty returns the first non-empty argument. House/building letters
// can appear either before or after the fraction ("45а/4" vs "1/1а").
func firstNonEmpty(values ...string) string {
for _, v := range values {
if v != "" {
return v
}
}
return ""
}
// parseStreet fills the street-related fields of p from the leftover string
// (the address with its house block removed).
func parseStreet(p *ParsedAddress, s string) {
tokens := strings.Fields(s)
if len(tokens) == 0 {
p.StreetKey = streetKey("", "")
return
}
name := make([]string, 0, len(tokens))
typeFound := false
for _, tok := range tokens {
// Only the first recognised type token is treated as the type; a
// second occurrence is part of the name.
if !typeFound {
if t, ok := streetTypes[tok]; ok {
p.StreetType = t
typeFound = true
continue
}
}
name = append(name, tok)
}
name = extractOrdinal(p, name)
p.NameDisplay = strings.Join(name, " ")
sorted := append([]string(nil), name...)
sort.Strings(sorted)
p.NameKey = strings.Join(sorted, " ")
p.StreetKey = streetKey(p.Ordinal, p.NameKey)
}
// extractOrdinal recognises a leading ordinal ("2-я", "2 я", "вторая") and
// removes it from the name tokens.
func extractOrdinal(p *ParsedAddress, tokens []string) []string {
if len(tokens) == 0 {
return tokens
}
if m := reOrdinalToken.FindStringSubmatch(tokens[0]); m != nil {
p.Ordinal = normalizeOrdinal(m[1])
return tokens[1:]
}
if isDigits(tokens[0]) && len(tokens) >= 2 && ordinalSuffixes[tokens[1]] {
p.Ordinal = normalizeOrdinal(tokens[0])
return tokens[2:]
}
if d, ok := ordinalWords[tokens[0]]; ok {
p.Ordinal = normalizeOrdinal(d)
return tokens[1:]
}
return tokens
}
// matchSuffix returns the capture groups of the match of re that ends exactly
// at the end of s, together with the byte offset where it starts. Go's regexp
// is leftmost-first, so we scan all matches and pick the right-anchored one.
func matchSuffix(re *regexp.Regexp, s string) (groups []string, start int, ok bool) {
for _, loc := range re.FindAllStringSubmatchIndex(s, -1) {
if loc[1] != len(s) {
continue
}
n := len(loc) / 2
groups = make([]string, n)
for i := 0; i < n; i++ {
if loc[2*i] >= 0 {
groups[i] = s[loc[2*i]:loc[2*i+1]]
}
}
return groups, loc[0], true
}
return nil, 0, false
}
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package address
import "testing"
func TestParseHouseBlock(t *testing.T) {
tests := []struct {
name string
raw string
wantOrdinal string
wantName string
wantType string
wantHouse string
wantFrac string
wantLetter string
wantBuild string
wantBFrac string
wantBLetter string
wantStruct string
wantHas bool
}{
{
name: "ordinal, fraction and structure",
raw: "2-я Станционная улица 1/1 стр.",
wantOrdinal: "2", wantName: "станционная", wantType: "улица",
wantHouse: "1", wantFrac: "1", wantStruct: "", wantHas: true,
},
{
name: "building with fraction and structure",
raw: "Станционная улица 30а к9/1 стр.",
wantName: "станционная", wantType: "улица",
wantHouse: "30", wantLetter: "а", wantBuild: "9", wantBFrac: "1", wantHas: true,
},
{
name: "letter glued to house",
raw: "10-й Бронный переулок 33а",
wantOrdinal: "10", wantName: "бронный", wantType: "переулок",
wantHouse: "33", wantLetter: "а", wantHas: true,
},
{
name: "microdistrict, two-word name",
raw: "Зеленый бор микрорайон 13",
wantName: "бор зеленый", wantType: "микрорайон",
wantHouse: "13", wantHas: true,
},
{
name: "spelled-out ordinal",
raw: "вторая Станционная улица 1",
wantOrdinal: "2", wantName: "станционная", wantType: "улица",
wantHouse: "1", wantHas: true,
},
{
name: "en dash variant",
raw: "2–я Станционная улица 1",
wantOrdinal: "2", wantName: "станционная", wantType: "улица",
wantHouse: "1", wantHas: true,
},
{
name: "no house",
raw: "Станционная улица",
wantName: "станционная", wantType: "улица", wantHas: false,
},
{
name: "structure with number only",
raw: "Станционная улица 3 стр.",
wantName: "станционная", wantType: "улица",
wantHouse: "3", wantStruct: "", wantHas: true,
},
{
name: "letter before fraction",
raw: "Выборная улица 45а/4",
wantName: "выборная", wantType: "улица",
wantHouse: "45", wantLetter: "а", wantFrac: "4", wantHas: true,
},
{
name: "corpus letter without digit",
raw: "1-я Ельцовка улица 1 кД",
wantOrdinal: "1", wantName: "ельцовка", wantType: "улица",
wantHouse: "1", wantBLetter: "д", wantHas: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
got := Parse(tt.raw)
if got.Ordinal != tt.wantOrdinal {
t.Errorf("Ordinal = %q, want %q", got.Ordinal, tt.wantOrdinal)
}
if got.NameKey != tt.wantName {
t.Errorf("NameKey = %q, want %q", got.NameKey, tt.wantName)
}
if got.StreetType != tt.wantType {
t.Errorf("StreetType = %q, want %q", got.StreetType, tt.wantType)
}
if got.House != tt.wantHouse {
t.Errorf("House = %q, want %q", got.House, tt.wantHouse)
}
if got.HouseFrac != tt.wantFrac {
t.Errorf("HouseFrac = %q, want %q", got.HouseFrac, tt.wantFrac)
}
if got.HouseLetter != tt.wantLetter {
t.Errorf("HouseLetter = %q, want %q", got.HouseLetter, tt.wantLetter)
}
if got.Building != tt.wantBuild {
t.Errorf("Building = %q, want %q", got.Building, tt.wantBuild)
}
if got.BuildingFrac != tt.wantBFrac {
t.Errorf("BuildingFrac = %q, want %q", got.BuildingFrac, tt.wantBFrac)
}
if got.BuildingLetter != tt.wantBLetter {
t.Errorf("BuildingLetter = %q, want %q", got.BuildingLetter, tt.wantBLetter)
}
if got.Structure != tt.wantStruct {
t.Errorf("Structure = %q, want %q", got.Structure, tt.wantStruct)
}
if got.HasHouse != tt.wantHas {
t.Errorf("HasHouse = %v, want %v", got.HasHouse, tt.wantHas)
}
})
}
}
// TestParseDeterministic guards the core invariant: parsing the same input
// always yields the same structured result and the same street key.
func TestParseDeterministic(t *testing.T) {
input := "2-я Станционная улица 1/1 стр."
first := Parse(input)
for i := 0; i < 100; i++ {
if got := Parse(input); got.StreetKey != first.StreetKey || got.House != first.House {
t.Fatalf("non-deterministic parse: %+v vs %+v", got, first)
}
}
}
func TestNormalizeIdempotent(t *testing.T) {
inputs := []string{
" 2-Я Станционная\u00a0улица 1/1 стр. ",
"ЁЛКИ д. 5, кв. 3",
"СТАНИЦИОННАЯ — улица, 30а",
"",
}
for _, in := range inputs {
once := NormalizeText(in)
twice := NormalizeText(once)
if once != twice {
t.Errorf("NormalizeText not idempotent for %q: %q != %q", in, once, twice)
}
}
}
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package address
import "strings"
// streetTypes maps a surface form (including common abbreviations) to a single
// canonical street type. The type is informational for matching (we strip it
// from the key) but useful for disambiguation and display.
var streetTypes = map[string]string{
"ул": "улица", "улица": "улица",
"пер": "переулок", "пер-к": "переулок", "переулок": "переулок",
"пр": "проезд", "проезд": "проезд",
"пр-т": "проспект", "просп": "проспект", "проспект": "проспект",
"ш": "шоссе", "шоссе": "шоссе",
"мкр": "микрорайон", "микрорайон": "микрорайон",
"туп": "тупик", "тупик": "тупик",
"спуск": "спуск",
"б-р": "бульвар", "бул": "бульвар", "бульвар": "бульвар",
"пл": "площадь", "площадь": "площадь",
"пос": "поселок", "поселок": "поселок",
"тракт": "тракт",
"аллея": "аллея",
"наб": "набережная", "набережная": "набережная",
"кольцо": "кольцо",
"просека": "просека",
"квартал": "квартал",
"территория": "территория",
"дорога": "дорога",
"разъезд": "разъезд",
}
// ordinalWords maps spelled-out ordinals to their digit form. Only the forms
// that actually occur in practice are listed; unknown words are treated as
// part of the street name.
var ordinalWords = map[string]string{
"первый": "1", "первая": "1", "первое": "1",
"второй": "2", "вторая": "2", "второе": "2",
"третий": "3", "третья": "3", "третье": "3",
"четвертый": "4", "четвертая": "4", "четвертое": "4",
"пятый": "5", "пятая": "5", "пятое": "5",
"шестой": "6", "шестая": "6", "шестое": "6",
"седьмой": "7", "седьмая": "7", "седьмое": "7",
"восьмой": "8", "восьмая": "8", "восьмое": "8",
"девятый": "9", "девятая": "9", "девятое": "9",
"десятый": "10", "десятая": "10", "десятое": "10",
}
// ordinalSuffixes are the gender/number endings that may follow an ordinal
// digit when it is written as a separate token ("2 я", "10 й").
var ordinalSuffixes = map[string]bool{
"я": true, "й": true, "е": true,
"ая": true, "ый": true, "ой": true, "ое": true,
"ий": true, "ья": true, "ье": true, "ьи": true,
}
// streetKey builds the canonical, type-independent street key:
// "<ordinal>|<sorted name tokens>". The type word is dropped so that a user
// who omits it ("станционная 1" instead of "Станционная улица 1") still
// matches; type confusion is surfaced later as ambiguity.
func streetKey(ordinal, nameKey string) string {
return ordinal + "|" + nameKey
}
// normalizeOrdinal trims leading zeros so "02-я" and "2-я" agree.
func normalizeOrdinal(s string) string {
return trimLeadingZeros(strings.TrimSpace(s))
}
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// Package address contains the deterministic address domain: text
// normalization, structural parsing and the canonical data types shared by the
// rest of addrkit.
//
// The package is deliberately free of any I/O (no HTTP, no database, no
// filesystem). Everything here is a pure function of its inputs, which makes
// the core trivially testable and reusable by the service, the CLI and tests.
package address
// Status is the machine-readable outcome of an address resolution.
//
// It is intentionally explicit: callers must never have to guess whether an
// empty result means "not found" or "the upstream failed".
type Status string
const (
// StatusFound means the street and the exact house unit were resolved.
StatusFound Status = "found"
// StatusPartial means the street was resolved but the house unit was not
// confirmed. The answer is safe but incomplete; the caller may ask the
// user to clarify the house number.
StatusPartial Status = "partial"
// StatusAmbiguous means more than one plausible match exists and the
// resolver refuses to guess.
StatusAmbiguous Status = "ambiguous"
// StatusNotFound means nothing in the registry matched.
StatusNotFound Status = "not_found"
// StatusPortalTimeout means the external outages portal did not answer in
// time. It is an infrastructure outcome, not "no outages".
StatusPortalTimeout Status = "portal_timeout"
// StatusInfra is a generic terminal infrastructure failure.
StatusInfra Status = "infra_error"
)
// ParsedAddress is the structured form of a free-form address string.
//
// The parser is lossy on purpose: punctuation, case and spacing are folded
// away so that different surface forms of the same address converge on the
// same StreetKey.
type ParsedAddress struct {
Raw string `json:"raw"`
Normalized string `json:"normalized"`
// Street components.
//
// NameKey is the order-insensitive canonical name (tokens sorted), so
// "Станционная 2-я" and "2-я Станционная" produce the same key.
Ordinal string `json:"ordinal,omitempty"`
NameKey string `json:"name_key,omitempty"`
NameDisplay string `json:"name_display,omitempty"`
StreetType string `json:"street_type,omitempty"`
StreetKey string `json:"street_key"`
// House unit components. A house "1/1 к2 стр.3" decomposes into
// House=1, HouseFrac=1, Building=2, Structure=3.
HasHouse bool `json:"has_house"`
House string `json:"house,omitempty"`
HouseFrac string `json:"house_frac,omitempty"`
HouseLetter string `json:"house_letter,omitempty"`
Building string `json:"building,omitempty"`
BuildingFrac string `json:"building_frac,omitempty"`
BuildingLetter string `json:"building_letter,omitempty"`
Structure string `json:"structure,omitempty"`
}
// Entry is a single canonical row from the address registry.
//
// Entries are produced at seed time by parsing the registry's display address
// with the very same parser used at query time, so index and query always
// agree on how an address is decomposed.
type Entry struct {
ID string `json:"id"`
Address string `json:"address"`
District string `json:"district,omitempty"`
Ordinal string `json:"ordinal,omitempty"`
NameKey string `json:"name_key,omitempty"`
NameDisplay string `json:"name_display,omitempty"`
StreetType string `json:"street_type,omitempty"`
StreetKey string `json:"street_key"`
House string `json:"house,omitempty"`
HouseFrac string `json:"house_frac,omitempty"`
HouseLetter string `json:"house_letter,omitempty"`
Building string `json:"building,omitempty"`
BuildingFrac string `json:"building_frac,omitempty"`
BuildingLetter string `json:"building_letter,omitempty"`
Structure string `json:"structure,omitempty"`
}
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// Package match resolves a ParsedAddress against a canonical registry index.
//
// It is the deterministic heart of addrkit. It knows nothing about storage,
// HTTP or LLMs: it operates on an in-memory index built from []address.Entry
// and always answers from that data. A wrong house number is never invented —
// when the exact house unit is not present the result is "partial", and when
// several streets are plausible the result is "ambiguous".
package match
import (
"sort"
"git.totmin.ru/en2zmax/addrkit/internal/domain/address"
)
// Candidate is one plausible match, returned alongside a non-"found" result so
// the caller (or an operator) can see what the resolver was choosing between.
type Candidate struct {
Address string `json:"address"`
District string `json:"district,omitempty"`
House string `json:"house,omitempty"`
Score float64 `json:"score"`
}
// Result is the outcome of a resolution.
type Result struct {
Status address.Status `json:"status"`
Address string `json:"address,omitempty"`
District string `json:"district,omitempty"`
Confidence float64 `json:"confidence"`
Candidates []Candidate `json:"candidates,omitempty"`
DataVersion string `json:"data_version,omitempty"`
}
// Options tunes matching behaviour.
type Options struct {
// FuzzyThreshold is the minimum similarity (0..1) for a street to be
// accepted as a typo-tolerant match. Below it the result is not_found.
FuzzyThreshold float64
// AmbiguityMargin: streets within this similarity of the best match make
// the result ambiguous instead of silently picking one.
AmbiguityMargin float64
// MaxCandidates caps the candidates returned to the caller.
MaxCandidates int
}
// DefaultOptions returns conservative defaults.
func DefaultOptions() Options {
return Options{
FuzzyThreshold: 0.82,
AmbiguityMargin: 0.03,
MaxCandidates: 5,
}
}
type streetRef struct {
key string
ordinal string
nameKey string
streetType string
}
// Index is an immutable, in-memory registry index. It is safe for concurrent
// reads once constructed.
type Index struct {
version string
opts Options
byKey map[string][]address.Entry
streets []streetRef
}
// NewIndex builds an index from canonical entries. Entries sharing a StreetKey
// are grouped; distinct streets are collected for typo-tolerant matching.
func NewIndex(version string, entries []address.Entry, opts Options) *Index {
ix := &Index{
version: version,
opts: opts,
byKey: make(map[string][]address.Entry, len(entries)),
}
seen := make(map[string]struct{}, len(entries))
for _, e := range entries {
ix.byKey[e.StreetKey] = append(ix.byKey[e.StreetKey], e)
if _, ok := seen[e.StreetKey]; !ok {
seen[e.StreetKey] = struct{}{}
ix.streets = append(ix.streets, streetRef{
key: e.StreetKey,
ordinal: e.Ordinal,
nameKey: e.NameKey,
streetType: e.StreetType,
})
}
}
sort.Slice(ix.streets, func(i, j int) bool { return ix.streets[i].key < ix.streets[j].key })
return ix
}
// Version returns the data version the index was built from.
func (ix *Index) Version() string { return ix.version }
// Size returns the number of indexed entries.
func (ix *Index) Size() int {
n := 0
for _, v := range ix.byKey {
n += len(v)
}
return n
}
// Resolve resolves a parsed address. It never returns an address that is not
// present in the index.
func (ix *Index) Resolve(p address.ParsedAddress) Result {
res := Result{DataVersion: ix.version}
entries := ix.byKey[p.StreetKey]
similarity := 1.0
if len(entries) == 0 {
var ambiguousKeys []string
entries, similarity, ambiguousKeys = ix.fuzzyStreets(p)
if len(ambiguousKeys) > 0 {
res.Status = address.StatusAmbiguous
res.Confidence = similarity
res.Candidates = ix.representatives(ambiguousKeys, similarity)
return res
}
}
if len(entries) == 0 {
res.Status = address.StatusNotFound
return res
}
if !p.HasHouse {
// Street is known but the caller did not supply a house: safe but
// incomplete.
res.Status = address.StatusPartial
res.Confidence = clamp01(similarity * 0.8)
res.Candidates = candidates(entries, similarity, ix.opts.MaxCandidates)
return res
}
matched := matchHouseUnit(entries, p)
switch len(matched) {
case 1:
res.Status = address.StatusFound
res.Address = matched[0].Address
res.District = matched[0].District
res.Confidence = clamp01(similarity)
return res
case 0:
// Street recognised, exact house unit absent, or several units share
// the same number (ambiguous at the unit level).
if sameHouseSeveral(entries, p) {
res.Status = address.StatusAmbiguous
res.Confidence = clamp01(similarity * 0.9)
res.Candidates = candidates(matchHouseUnitAll(entries, p), similarity, ix.opts.MaxCandidates)
return res
}
res.Status = address.StatusPartial
res.Confidence = clamp01(similarity * 0.9)
res.Candidates = candidates(entries, similarity, ix.opts.MaxCandidates)
return res
default:
res.Status = address.StatusAmbiguous
res.Confidence = clamp01(similarity * 0.9)
res.Candidates = candidates(matched, similarity, ix.opts.MaxCandidates)
return res
}
}
// fuzzyStreets finds streets similar to the query. It returns the entries of
// the best street when the match is unambiguous, or the list of competing
// street keys when several are within the ambiguity margin.
func (ix *Index) fuzzyStreets(p address.ParsedAddress) (entries []address.Entry, similarity float64, ambiguousKeys []string) {
if p.NameKey == "" {
return nil, 0, nil
}
best := 0.0
bestKey := ""
for _, s := range ix.streets {
// If both sides carry an ordinal and they differ, the streets are
// different even if the names rhyme.
if p.Ordinal != "" && s.ordinal != "" && p.Ordinal != s.ordinal {
continue
}
if sim := ratio(p.NameKey, s.nameKey); sim > best {
best = sim
bestKey = s.key
}
}
if best < ix.opts.FuzzyThreshold {
return nil, best, nil
}
for _, s := range ix.streets {
if p.Ordinal != "" && s.ordinal != "" && p.Ordinal != s.ordinal {
continue
}
if ratio(p.NameKey, s.nameKey) >= best-ix.opts.AmbiguityMargin {
ambiguousKeys = append(ambiguousKeys, s.key)
}
}
if len(ambiguousKeys) > 1 {
return nil, best, ambiguousKeys
}
return ix.byKey[bestKey], best, nil
}
// representatives returns one candidate per competing street, which is far
// more useful to a user than five houses of a single street.
func (ix *Index) representatives(keys []string, score float64) []Candidate {
sort.Strings(keys)
out := make([]Candidate, 0, len(keys))
for _, k := range keys {
es := ix.byKey[k]
if len(es) == 0 {
continue
}
e := es[0]
out = append(out, Candidate{
Address: e.Address,
District: e.District,
House: e.House,
Score: clamp01(score),
})
if len(out) == ix.opts.MaxCandidates {
break
}
}
return out
}
// matchHouseUnit returns entries whose house unit equals p's, exactly.
func matchHouseUnit(entries []address.Entry, p address.ParsedAddress) []address.Entry {
var out []address.Entry
for _, e := range entries {
if houseUnitEqual(e, p) {
out = append(out, e)
}
}
return out
}
// matchHouseUnitAll returns all entries for entries that share the same house
// number as p (used to surface ambiguity).
func matchHouseUnitAll(entries []address.Entry, p address.ParsedAddress) []address.Entry {
var out []address.Entry
for _, e := range entries {
if e.House == p.House && e.HouseFrac == p.HouseFrac && e.HouseLetter == p.HouseLetter {
out = append(out, e)
}
}
return out
}
// sameHouseSeveral reports whether more than one entry matches the house
// number but with differing buildings/letters, i.e. the unit is ambiguous.
func sameHouseSeveral(entries []address.Entry, p address.ParsedAddress) bool {
return len(matchHouseUnitAll(entries, p)) > 1
}
// houseUnitEqual compares the parts of a house unit. Unspecified (empty) parts
// must also be empty on the entry side, so "60/1" never matches "60/1 к148".
func houseUnitEqual(e address.Entry, p address.ParsedAddress) bool {
return e.House == p.House &&
e.HouseFrac == p.HouseFrac &&
e.HouseLetter == p.HouseLetter &&
e.Building == p.Building &&
e.BuildingFrac == p.BuildingFrac &&
e.BuildingLetter == p.BuildingLetter
}
func candidates(entries []address.Entry, score float64, limit int) []Candidate {
if limit <= 0 || len(entries) == 0 {
return nil
}
out := make([]Candidate, 0, len(entries))
for _, e := range entries {
out = append(out, Candidate{
Address: e.Address,
District: e.District,
House: e.House,
Score: clamp01(score),
})
if len(out) == limit {
break
}
}
return out
}
func clamp01(v float64) float64 {
if v < 0 {
return 0
}
if v > 1 {
return 1
}
return v
}
+137
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package match
import (
"testing"
"git.totmin.ru/en2zmax/addrkit/internal/domain/address"
)
// buildIndex parses canonical addresses into entries, mirroring what the seed
// pipeline does, so tests exercise the real code path end to end.
func buildIndex(t *testing.T, addresses ...string) *Index {
t.Helper()
entries := make([]address.Entry, 0, len(addresses))
for i, a := range addresses {
p := address.Parse(a)
entries = append(entries, address.Entry{
ID: a, Address: a, District: "Тестовый",
Ordinal: p.Ordinal, NameKey: p.NameKey, StreetType: p.StreetType, StreetKey: p.StreetKey,
House: p.House, HouseFrac: p.HouseFrac, HouseLetter: p.HouseLetter,
Building: p.Building, BuildingFrac: p.BuildingFrac, BuildingLetter: p.BuildingLetter,
Structure: p.Structure,
})
_ = i
}
return NewIndex("test", entries, DefaultOptions())
}
func TestResolveStatuses(t *testing.T) {
ix := buildIndex(t,
"Станционная улица 1/1",
"Станционная улица 2/1",
"Станционная улица 3/1 к1",
"Станционная улица 3/1 к2",
"Искитимская улица 5",
)
tests := []struct {
name string
query string
wantStatus address.Status
wantAddr string
}{
{
name: "found with ordinal, fraction and structure noise",
query: "2-я Станционная улица 1/1 стр.",
wantStatus: address.StatusFound,
wantAddr: "Станционная улица 1/1",
},
{
name: "found exact house",
query: "станционная 2/1",
wantStatus: address.StatusFound,
wantAddr: "Станционная улица 2/1",
},
{
name: "found with corpus",
query: "Станционная улица 3/1 корпус 1",
wantStatus: address.StatusFound,
wantAddr: "Станционная улица 3/1 к1",
},
{
name: "typo in street name tolerated",
query: "станционая 1/1",
wantStatus: address.StatusFound,
wantAddr: "Станционная улица 1/1",
},
{
name: "missing house is partial",
query: "станционная улица",
wantStatus: address.StatusPartial,
},
{
name: "wrong house fraction is partial",
query: "станционная 1/2",
wantStatus: address.StatusPartial,
},
{
name: "ambiguous building",
query: "станционная 3/1",
wantStatus: address.StatusAmbiguous,
},
{
name: "unknown street",
query: "ленина 5",
wantStatus: address.StatusNotFound,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
res := ix.Resolve(address.Parse(tt.query))
if res.Status != tt.wantStatus {
t.Fatalf("status = %q, want %q (candidates: %+v)", res.Status, tt.wantStatus, res.Candidates)
}
if tt.wantAddr != "" && res.Address != tt.wantAddr {
t.Errorf("address = %q, want %q", res.Address, tt.wantAddr)
}
if res.DataVersion != "test" {
t.Errorf("data version = %q, want test", res.DataVersion)
}
})
}
}
// TestResolveNeverInventsAddress is the central safety property: whenever the
// status is "found", the returned address must exist in the index.
func TestResolveNeverInventsAddress(t *testing.T) {
addresses := []string{
"Станционная улица 1/1",
"Станционная улица 2/1",
"Искитимская улица 5",
}
ix := buildIndex(t, addresses...)
known := make(map[string]bool, len(addresses))
for _, a := range addresses {
known[a] = true
}
queries := []string{
"2-я Станционная 1/1", "станционная 2/1 к9", "искитимская 5", "искитимская 5/1",
"несуществующая 99", "станционная 1/1 стр.3", " ",
}
for _, q := range queries {
res := ix.Resolve(address.Parse(q))
if res.Status == address.StatusFound && !known[res.Address] {
t.Fatalf("invented address %q for query %q", res.Address, q)
}
}
}
func TestRatio(t *testing.T) {
if got := ratio("станционная", "станционная"); got != 1 {
t.Errorf("identical strings ratio = %v, want 1", got)
}
if got := ratio("станционная", "искитимская"); got > 0.6 {
t.Errorf("unrelated strings ratio = %v, want < 0.6", got)
}
}
+62
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package match
// levenshtein returns the edit distance between two strings, measured in
// runes. It uses the rolling-row formulation: O(min(n,m)) memory.
//
// The resolver uses it only to tolerate typos in the *street name*; house
// numbers are always compared exactly, because a wrong house is worse than a
// missing one.
func levenshtein(a, b string) int {
ra, rb := []rune(a), []rune(b)
if len(ra) == 0 {
return len(rb)
}
if len(rb) == 0 {
return len(ra)
}
prev := make([]int, len(rb)+1)
curr := make([]int, len(rb)+1)
for j := range prev {
prev[j] = j
}
for i := 1; i <= len(ra); i++ {
curr[0] = i
for j := 1; j <= len(rb); j++ {
cost := 1
if ra[i-1] == rb[j-1] {
cost = 0
}
curr[j] = min3(prev[j]+1, curr[j-1]+1, prev[j-1]+cost)
}
prev, curr = curr, prev
}
return prev[len(rb)]
}
// ratio returns a 0..1 similarity where 1 means identical. It is
// 1 - distance/max(len), which is stable and easy to reason about.
func ratio(a, b string) float64 {
if a == b {
return 1
}
la, lb := len([]rune(a)), len([]rune(b))
m := la
if lb > m {
m = lb
}
if m == 0 {
return 1
}
return 1 - float64(levenshtein(a, b))/float64(m)
}
func min3(a, b, c int) int {
m := a
if b < m {
m = b
}
if c < m {
m = c
}
return m
}
+89
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package match
import (
"context"
"git.totmin.ru/en2zmax/addrkit/internal/domain/address"
)
// Rewriter is an optional, pluggable query rewriter. Its only job is to
// propose alternative surface forms of a user address (for example an LLM
// normalising "кошурникова одиннадцать дробь один" to "Кошевого 11/1"). The
// rewriter never decides the answer: every proposal is parsed and resolved
// deterministically, and only entries that exist in the index can be returned.
//
// It is defined here (consumer side) so the domain stays free of any transport
// or vendor dependency.
type Rewriter interface {
Rewrite(ctx context.Context, raw string) ([]string, error)
}
// Resolver wraps an Index with an optional Rewriter.
//
// The deterministic path is always tried first. The rewriter is consulted only
// when the deterministic result is not a confident "found", and its
// suggestions can only ever turn a miss into a match against real data.
type Resolver struct {
index *Index
rewriter Rewriter
}
// NewResolver builds a resolver. rewriter may be nil to disable rewriting.
func NewResolver(index *Index, rewriter Rewriter) *Resolver {
return &Resolver{index: index, rewriter: rewriter}
}
// Version returns the current data version.
func (r *Resolver) Version() string { return r.index.Version() }
// Ready reports whether the resolver has a usable index.
func (r *Resolver) Ready() bool { return r.index != nil && r.index.Size() > 0 }
// Resolve parses raw and resolves it, consulting the rewriter when enabled.
func (r *Resolver) Resolve(ctx context.Context, raw string) Result {
parsed := address.Parse(raw)
res := r.index.Resolve(parsed)
if res.Status == address.StatusFound || r.rewriter == nil {
return res
}
if res.Status != address.StatusNotFound && res.Status != address.StatusAmbiguous {
return res
}
alternatives, err := r.rewriter.Rewrite(ctx, raw)
if err != nil || len(alternatives) == 0 {
return res
}
best := res
for _, alt := range alternatives {
candidate := r.index.Resolve(address.Parse(alt))
if better(candidate, best) {
best = candidate
}
}
return best
}
// better ranks results: a stronger status wins, then higher confidence.
func better(a, b Result) bool {
ra, rb := statusRank(a.Status), statusRank(b.Status)
if ra != rb {
return ra > rb
}
return a.Confidence > b.Confidence
}
func statusRank(s address.Status) int {
switch s {
case address.StatusFound:
return 3
case address.StatusAmbiguous:
return 2
case address.StatusPartial:
return 1
default:
return 0
}
}
+109
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// Package outages contains the deterministic, pure logic for selecting outages
// that belong to a concrete house unit. It does not talk to the network: the
// portal client lives in an adapter and feeds this package.
package outages
import (
"context"
"strconv"
"strings"
"time"
"git.totmin.ru/en2zmax/addrkit/internal/domain/address"
)
// Outage is a single outage record as returned by the external portal.
type Outage struct {
Type string `json:"type,omitempty"`
System string `json:"system,omitempty"`
Address string `json:"address,omitempty"`
StartDate string `json:"start_date,omitempty"`
EndDate string `json:"end_date,omitempty"`
Time string `json:"time,omitempty"`
Action string `json:"action,omitempty"`
}
// Source is anything that can answer "what outages are there for this
// canonical address". It is implemented by the ArcGIS portal adapter and by
// fakes in tests.
type Source interface {
Query(ctx context.Context, canonical string) ([]Outage, error)
}
// MatchingHouse keeps only the outages that address the same house unit as the
// target. This is the fix for the classic bug where a substring match returned
// a neighbouring house's outage: matching is done on the parsed structure, not
// on the raw text.
func MatchingHouse(list []Outage, target address.ParsedAddress) []Outage {
out := make([]Outage, 0, len(list))
for _, o := range list {
op := address.Parse(o.Address)
if houseUnitEqual(target, op) {
out = append(out, o)
}
}
return out
}
// houseUnitEqual compares two parsed house units. House number, fraction,
// letter, building (corpus) and its fraction/letter must all match. The
// structure (строение) is deliberately ignored: it is frequently omitted by
// users and does not change which house an outage refers to.
func houseUnitEqual(a, b address.ParsedAddress) bool {
return a.House == b.House &&
a.HouseFrac == b.HouseFrac &&
a.HouseLetter == b.HouseLetter &&
a.Building == b.Building &&
a.BuildingFrac == b.BuildingFrac &&
a.BuildingLetter == b.BuildingLetter
}
// Current keeps outages whose [start, end] range covers now. The portal
// already filters by date, but we re-check locally because the portal's notion
// of "today" and ours must agree (Asia/Novosibirsk, UTC+7).
func Current(list []Outage, now time.Time, loc *time.Location) []Outage {
out := make([]Outage, 0, len(list))
for _, o := range list {
start, okStart := parsePortalTime(o.StartDate, loc)
end, okEnd := parsePortalTime(o.EndDate, loc)
if !okStart || !okEnd {
// Undated records are kept: better to report a possibly-current
// outage than to silently drop it.
out = append(out, o)
continue
}
if (now.Equal(start) || now.After(start)) && (now.Equal(end) || now.Before(end)) {
out = append(out, o)
}
}
return out
}
// parsePortalTime accepts the shapes the portal may produce: epoch
// milliseconds, epoch seconds, RFC3339 and a few common date formats. All
// results are interpreted in loc.
func parsePortalTime(s string, loc *time.Location) (time.Time, bool) {
s = strings.TrimSpace(s)
if s == "" {
return time.Time{}, false
}
if n, err := strconv.ParseInt(s, 10, 64); err == nil {
// Heuristic: 13+ digits is milliseconds, otherwise seconds.
if n > 1e12 {
return time.UnixMilli(n).In(loc), true
}
return time.Unix(n, 0).In(loc), true
}
layouts := []string{
time.RFC3339,
"2006-01-02T15:04:05",
"2006-01-02 15:04:05",
"2006-01-02",
}
for _, layout := range layouts {
if t, err := time.ParseInLocation(layout, s, loc); err == nil {
return t, true
}
}
return time.Time{}, false
}
+57
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package outages
import (
"strconv"
"testing"
"time"
"git.totmin.ru/en2zmax/addrkit/internal/domain/address"
)
func TestMatchingHouse(t *testing.T) {
list := []Outage{
{Address: "Станционная улица 1/1", System: "Теплоснабжение"},
{Address: "Станционная улица 1/2", System: "Теплоснабжение"},
{Address: "Станционная улица 1/1 к1", System: "Теплоснабжение"},
{Address: "Станционная улица 10", System: "Теплоснабжение"},
}
target := address.Parse("2-я Станционная улица 1/1")
got := MatchingHouse(list, target)
if len(got) != 1 {
t.Fatalf("expected exactly 1 matching outage, got %d: %+v", len(got), got)
}
if got[0].Address != "Станционная улица 1/1" {
t.Errorf("matched wrong outage: %q", got[0].Address)
}
}
func TestMatchingHouseIgnoresStructure(t *testing.T) {
list := []Outage{{Address: "Станционная улица 1/1 стр.2"}}
target := address.Parse("станционная 1/1 стр.3")
if got := MatchingHouse(list, target); len(got) != 1 {
t.Fatalf("structure must not affect house matching; got %d", len(got))
}
}
func TestCurrent(t *testing.T) {
loc := time.FixedZone("NSK", 7*3600)
now := time.Date(2026, 10, 9, 12, 0, 0, 0, loc)
within := now.Add(-time.Hour).UnixMilli()
after := now.Add(time.Hour).UnixMilli()
before := now.Add(-48 * time.Hour).UnixMilli()
list := []Outage{
{Address: "A", StartDate: itoa(within), EndDate: itoa(after)}, // current
{Address: "B", StartDate: itoa(before), EndDate: itoa(before)}, // past
{Address: "C", StartDate: "", EndDate: ""}, // undated -> kept
}
got := Current(list, now, loc)
if len(got) != 2 {
t.Fatalf("expected 2 current outages, got %d: %+v", len(got), got)
}
}
func itoa(v int64) string {
return strconv.FormatInt(v, 10)
}