$ show syncthing/syncthing

[account ↗] [repo ↗] APPLICATION ★ 89102 5504 ● active (last update 2 weeks ago)

── AI DEEP ANALYSIS ──

reviewed by: deepseek/deepseek-v4-flash

Syncthing is a continuous peer-to-peer file synchronization application written in Go. It runs as a daemon, monitors local folders, hashes files into blocks, exchanges metadata with other devices via the Block Exchange Protocol (BEP) over TLS, and transfers blocks as needed. The architecture is a monolithic core with separate infrastructure server binaries for discovery, relay, upgrades, and usage reporting. The main binary includes the sync engine, REST API, web GUI (AngularJS), and CLI. It uses a suture-based service tree for managing goroutine lifecycles. Key data flows involve file scanning, hashing, index exchange, block request/response, and file writing, with events propagated to the API via an event system. The codebase demonstrates high craftsmanship with clean abstractions (filesystem layer, database abstraction, version vectors), extensive testing, and cross-platform support. It is actively maintained with a large community.

── METRICS ──

RATING9.6/10

QUALITY8.5/10

MAINTENANCEactive

DRIFTlow

CONTRIBUTORS397

VELOCITY0.94

OPEN ISSUES387

CLOSED ISSUES5593

LAST COMMIT2 weeks ago

── TAGS ──

#file-synchronization #peer-to-peer #go #p2p-sync #block-exchange-protocol #distributed-systems #cross-platform #synchronization #p2p

── GITHUB TOPICS ──

synchronization go peer-to-peer p2p

── DEPENDENCY GRAPH ──

github.com/AudriusButkevicius/recli (go) v0.0.7

github.com/alecthomas/kong (go) v1.16.1

github.com/aws/aws-sdk-go (go) v1.55.8

github.com/calmh/incontainer (go) v1.0.0

github.com/calmh/xdr (go) v1.2.0

github.com/ccding/go-stun (go) v0.1.6

github.com/coreos/go-semver (go) v0.3.1

github.com/d4l3k/messagediff (go) v1.2.1

github.com/getsentry/raven-go (go) v0.2.0

github.com/go-ldap/ldap/v3 (go) v3.4.14

github.com/gobwas/glob (go) v0.2.3

github.com/gofrs/flock (go) v0.13.0

github.com/hashicorp/golang-lru/v2 (go) v2.0.7

github.com/jackpal/gateway (go) v1.2.0

github.com/jackpal/go-nat-pmp (go) v1.0.2

github.com/jmoiron/sqlx (go) v1.4.0

github.com/julienschmidt/httprouter (go) v1.3.0

github.com/kballard/go-shellquote (go) v0.0.0-20180428030007-95032a82bc51

github.com/maruel/panicparse/v2 (go) v2.5.0

github.com/mattn/go-sqlite3 (go) v1.14.50

github.com/maxmind/geoipupdate/v6 (go) v6.1.0

github.com/miscreant/miscreant.go (go) v0.0.0-20200214223636-26d376326b75

github.com/oschwald/geoip2-golang (go) v1.13.0

github.com/pierrec/lz4/v4 (go) v4.1.29

github.com/prometheus/client_golang (go) v1.24.1

github.com/puzpuzpuz/xsync/v3 (go) v3.5.1

github.com/quic-go/quic-go (go) v0.61.0

github.com/rabbitmq/amqp091-go (go) v1.14.0

github.com/rcrowley/go-metrics (go) v0.0.0-20250401214520-65e299d6c5c9

github.com/shirou/gopsutil/v4 (go) v4.26.7

github.com/syncthing/notify (go) v0.0.0-20250528144937-c7027d4f7465

github.com/syndtr/goleveldb (go) v1.0.1-0.20220721030215-126854af5e6d

github.com/thejerf/suture/v4 (go) v4.0.6

github.com/urfave/cli (go) v1.22.17

github.com/vitrun/qart (go) v0.0.0-20160531060029-bf64b92db6b0

github.com/willabides/kongplete (go) v0.4.0

github.com/wlynxg/anet (go) v0.0.5

golang.org/x/crypto (go) v0.55.0

golang.org/x/exp (go) v0.0.0-20260813180055-c1d0aacb2297

golang.org/x/net (go) v0.58.0

golang.org/x/sys (go) v0.47.0

golang.org/x/text (go) v0.41.0

golang.org/x/time (go) v0.15.0

google.golang.org/protobuf (go) v1.36.12

modernc.org/sqlite (go) v1.57.0

sigs.k8s.io/yaml (go) v1.6.0

github.com/Azure/go-ntlmssp (go) v0.1.1

github.com/beorn7/perks (go) v1.0.1

github.com/cenkalti/backoff/v4 (go) v4.3.0

github.com/certifi/gocertifi (go) v0.0.0-20210507211836-431795d63e8d

github.com/cespare/xxhash/v2 (go) v2.3.0

github.com/cpuguy83/go-md2man/v2 (go) v2.0.7

github.com/dustin/go-humanize (go) v1.0.1

github.com/ebitengine/purego (go) v0.10.2

github.com/fsnotify/fsnotify (go) v1.7.0

github.com/go-asn1-ber/asn1-ber (go) v1.5.8

github.com/go-ole/go-ole (go) v1.3.0

github.com/golang/snappy (go) v0.0.4

github.com/google/uuid (go) v1.6.0

github.com/hashicorp/errwrap (go) v1.1.0

github.com/hashicorp/go-multierror (go) v1.1.1

github.com/jmespath/go-jmespath (go) v0.4.0

github.com/lufia/plan9stats (go) v0.0.0-20240909124753-873cd0166683

github.com/mattn/go-isatty (go) v0.0.24

github.com/maxbrunsfeld/counterfeiter/v6 (go) v6.12.0

github.com/munnerz/goautoneg (go) v0.0.0-20191010083416-a7dc8b61c822

github.com/ncruces/go-strftime (go) v1.0.0

github.com/nxadm/tail (go) v1.4.11

github.com/oschwald/maxminddb-golang (go) v1.13.1

github.com/pkg/errors (go) v0.9.1

github.com/posener/complete (go) v1.2.3

github.com/power-devops/perfstat (go) v0.0.0-20240221224432-82ca36839d55

github.com/prometheus/client_model (go) v0.6.2

github.com/prometheus/common (go) v0.70.1

github.com/prometheus/procfs (go) v0.21.1

github.com/remyoudompheng/bigfft (go) v0.0.0-20230129092748-24d4a6f8daec

github.com/riywo/loginshell (go) v0.0.0-20200815045211-7d26008be1ab

github.com/russross/blackfriday/v2 (go) v2.1.0

github.com/tklauser/go-sysconf (go) v0.3.16

github.com/tklauser/numcpus (go) v0.11.0

github.com/yusufpapurcu/wmi (go) v1.2.4

go.yaml.in/yaml/v2 (go) v2.4.4

golang.org/x/mod (go) v0.39.0

golang.org/x/sync (go) v0.22.0

golang.org/x/telemetry (go) v0.0.0-20260811182544-a038080d80e5

golang.org/x/tools (go) v0.49.0

modernc.org/libc (go) v1.74.4

modernc.org/mathutil (go) v1.7.1

modernc.org/memory (go) v1.11.0

── FILE BREAKDOWN ──

Files by Type (count)

548

JSON

HTML

JavaScript

Markdown

Other (no ext)

XML

YAML

Other (.pem)

Other (.svg)

SQL

Other (.png)

Files by Type (size)

3MB

JSON

2MB

JavaScript

2MB

Other (.icns)

1MB

Other (no ext)

1MB

Other (.svg)

572KB

HTML

242KB

CSS

231KB

Other (.7)

221KB

Other (.eot)

214KB

Other (.ttf)

213KB

Other (.woff)

184KB

── KEY FINDINGS: REUSABLE CODE ──

The LLM identified 5 files worth highlighting for reuse:

Provides a layered filesystem abstraction with decorators for metrics, case-insensitivity, mtime preservation, and logging. Isolated and could be extracted as a standalone library for any Go project needing a mockable, cross-platform filesystem.

file: lib/fs/filesystem.go ↗ | tags: #filesystem-abstraction #decorator-pattern #cross-platform

Implements version vectors for conflict resolution in a distributed system. Self-contained, well-tested, and demonstrates non-obvious skill in handling concurrent updates and merge semantics.

file: lib/protocol/vector.go ↗ | tags: #version-vectors #conflict-resolution #distributed-systems

A condition variable with timeout support, built on sync.Cond. Simple, well-crafted, and reusable for any Go concurrency pattern requiring wait with deadline.

file: lib/syncutil/timeoutcond.go ↗ | tags: #condition-variable #timeout #concurrency

A capacity-aware semaphore with MultiSemaphore for managing multiple resources. Reusable concurrency primitive with clear API and tests.

file: lib/semaphore/semaphore.go ↗ | tags: #semaphore #concurrency-control #capacity-management

A pattern matcher for .stignore files supporting includes, case-folding, deletable flags, and directory skipping. Could be reused for any ignore-file pattern matching in Go.

file: lib/ignore/ignore.go ↗ | tags: #pattern-matching #ignore-files #gitignore-style

── HISTORY ──

Last analyzed: 2026-10-02 12:13:48.926013

Next check: 2026-10-09 12:13:48.890387