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Hi, I'm hsdfat 👋

Go engineer building telecom core networks and the cloud-native systems around them. I work primarily on 5G/EPC network functions, then take the production problems I find upstream to the Go and Kubernetes ecosystem.

Focus

  • 5G Core, EPC interworking, Diameter, SBI, HTTP/2, and NETCONF
  • Go services on Kubernetes, with Helm-based delivery and end-to-end testing
  • Storage, observability, and performance work that makes production systems safer under load

Current work — udm-system

A Go monorepo for a combined 5GC + EPC stack: UDM, AUSF, UDR, HSS, EIR, Diameter and HTTP/2 gateways, provisioning, and the test and profiling tools needed to operate them.

Open source

I contribute production-driven fixes to the infrastructure I use: Kubernetes tooling, storage, media, observability, stream processing, and 5G projects.

46 merged pull requests (1 later reverted) across 21 upstream projects totalling 265.9k stars · 29 in review

Browse every merged and open upstream pull request

Merged

Project ★ PR Contribution
rclone/rclone 60.1k #9693 fserrors: make http2 "server sent GOAWAY" a retriable error - fixes #96…
rclone/rclone 60.1k #9751 operations: check checksums in rcat with known size - fixes #6305
rclone/rclone 60.1k #9868 dropbox: fix shared folder mount for roots nested more than one level d…
rclone/rclone 60.1k #9869 dropbox: match shared-folder and received-file names case-insensitively
rclone/rclone 60.1k #9870 serve docker: fix volume path being lost when the plugin restarts
rclone/rclone 60.1k #9872 fs/config: only run --password-command once when using --daemon
rclone/rclone 60.1k #9944 operations: make --immutable work with copyto, moveto and single file c…
rclone/rclone 60.1k #9945 smb: save the user name in the config even if it matches the current us…
rclone/rclone 60.1k #9947 local: stop --copy-links following symlink loops - fixes #4402
rclone/rclone 60.1k #9949 vfs: fix AddVirtual ignoring isDir
rclone/rclone 60.1k #9950 serve dlna: log unescaped paths - fixes #7370
rclone/rclone 60.1k #9977 docker: add mailcap for /etc/mime.types - fixes #6384
go-gitea/gitea 58.3k #38693 fix(lfs): failed upload deletes a concurrent upload's meta object
alibaba/open-code-review 43.3k #501 feat(allowlist): add Julia (.jl) support
seaweedfs/seaweedfs 35.2k #10656 s3api: fix ListObjectsV2 dropping objects under a partial prefix
seaweedfs/seaweedfs 35.2k #11393 fix(volume): return an error instead of panicking on a corrupt needle s…
seaweedfs/seaweedfs 35.2k #11397 fix(volume): return an error instead of 201 when a write lands on no vo…
seaweedfs/seaweedfs 35.2k #11398 fix(volume): stop ScanVolumeFileFrom at a header it cannot advance past
seaweedfs/seaweedfs 35.2k #11399 fix(volume): validate sizes in ReadNeedleBlob and WriteNeedleBlob
seaweedfs/seaweedfs 35.2k #11483 fix(volume-rust): reserve a disk before replacing a replica in VolumeCo…
grpc-ecosystem/grpc-gateway 20k #7110 docs: add runnable OpenTelemetry tracing example
grpc-ecosystem/grpc-gateway 20k #7207 fix(openapiv2): omit oneof siblings of path parameters from query param…
IBM/sarama 12.5k #3752 fix(client): only deregister the broker registered under that ID
kubeshark/kubeshark 12.1k #1956 helm: use Recreate strategy for hub Deployment when local snapshots PVC…
shirou/gopsutil 11.9k #2143 [docker][linux]: support cgroup v2 in Cgroup* functions
shirou/gopsutil 11.9k #2163 [cpu][darwin]: don't crash in getFrequency when pmgr lacks voltage-stat…
uptrace/bun 5k #1414 fix(bunotel): honor WithMeterProvider when reporting DB stats metrics
uptrace/bun 5k #1415 fix(relation): do not duplicate joined models on a shared base model
uptrace/bun 5k #1435 fix: resolve map column types before scanning rows
apache/arrow-rs 3.6k #11229 fix(parquet): support non-primitive map keys in record reader
nginx/nginx-gateway-fabric 1.2k #5639 fix: correct validation error diagnostics and add missing CRD schema co…
bluenviron/gortsplib 940 #1171 sdp: support oversized numbers in origin (bluenviron/mediamtx#5949)
algesten/str0m 629 #1058 Limit pacer burst size at high bitrates
kerlenton/mcpsnoop 358 #212 feat(check): emit SARIF 2.1.0 so findings land in the Security tab
kerlenton/mcpsnoop 358 #213 feat(cli): wrap and unwrap the Claude Desktop config for one server
gopacket/gopacket 316 #172 Reverted after merge. packet: set zeroCopy in NewZeroCopyPacketSource
fiorix/go-diameter 295 #262 diam: key the Unmarshal AVP index by {Code, VendorID}
nickvsnetworking/pyhss 115 #337 diameterService: iterate over a snapshot of activePeers
bluenviron/mediacommon 101 #368 h265: fix DTS extraction of streams with temporal sub-layers
bluenviron/mediacommon 101 #373 pmp4: support stsz with a constant sample size (bluenviron/mediamtx#580…
bluenviron/mediacommon 101 #375 pmp4: support tracks without edts
bluenviron/mediacommon 101 #376 pmp4: return seek errors from GetPayload
bluenviron/mediacommon 101 #377 pmp4: support tracks longer than 2^32 ticks
free5gc/amf 23 #232 fix: guard non-string DNN type assertions in GMM handler
free5gc/tngf 5 #47 fix: prevent slice-bounds panic on malformed IKE SA proposal
free5gc/ike 3 #24 fix: prevent slice-bounds panics from uint8 SPI offset overflow

In review

Project ★ PR Contribution
caddyserver/caddy 76.2k #8062 caddyhttp: Add status_code option to http_redirect listener wrapper
caddyserver/caddy 76.2k #8063 caddyauth: Support third-party http.authentication.hashes modules
rclone/rclone 60.1k #9946 serve sftp, serve webdav: fix stale hashes reported while a file is bei…
nushell/nushell 40.6k #19092 Clear sqlite history with SQL instead of deleting the file
bluenviron/mediamtx 20.3k #6195 playback: cache segment headers to speed up /list (#5094)
bluenviron/mediamtx 20.3k #6196 add udpWriteBufferSize parameter (#6100)
argoproj/argo-workflows 17k #16602 perf(executor): read the resource once for all output parameters
IBM/sarama 12.5k #3753 fix(offset): avoid deadlock when closing during a blocked commit
velero-io/velero 10.3k #10212 Fix Zip Slip path check accepting a sibling directory in archive extrac…
anchore/syft 9.6k #5121 fix(binary): match istio snapshot and older pre-release versions
redpanda-data/connect 8.8k #4656 slack: only enforce token prefixes on literal values
woodpecker-ci/woodpecker 7.9k #7189 Release agents waiting on gRPC long polls on server shutdown
woodpecker-ci/woodpecker 7.9k #7192 Handle concurrent persist of identical pipeline config
vishvananda/netlink 3.3k #1225 filter: use EncDestIPMask when encoding Flower EncDestIP
apache/iceberg-rust 1.4k #3284 fix(spec): accept object-form partition-spec in manifest metadata
bluenviron/gortsplib 940 #1178 format: support mismatched fmtp payload type
bluenviron/gortsplib 940 #1181 client: support SETUP responses without Transport header
pion/stun 860 #301 Restrict stun-client to IPv4
asticode/go-astits 618 #79 Sync to the first packet when the stream doesn't start with a sync byte
ClickHouse/clickhouse-rs 560 #478 fix(types): parse JSON type hints with parenthesized types
ClickHouse/clickhouse-rs 560 #481 fix: don't send the client's query_id with the insert DESCRIBE TABLE
pion/rtp 478 #372 Drop H264 FU-A fragments without a start
scottlamb/retina 373 #140 H.265: treat all IRAP pictures (CRA/BLA) as random access points
pion/interceptor 147 #470 Assign RTX sequence numbers at send time
nickvsnetworking/pyhss 115 #338 diameter: answer with an error Result-Code when a handler raises
bluenviron/mediacommon 101 #380 mpegts: fix reading UDP datagrams larger than 1316 bytes
free5gc/smf 25 #244 fix: release SMContext and reject when UDM token fetch fails
free5gc/udm 9 #96 fix(udm): return ProblemDetails for unmatched resource URIs
free5gc/udr 4 #70 fix: return ProblemDetails for unmatched resource URIs

Regenerated nightly from the GitHub API by scripts/build_stats.py. Own and private repositories are excluded, so every row is a public upstream contribution.

Tech

Go · Kubernetes · Helm · Docker · gRPC / protobuf · Diameter · HTTP/2 · SBI · NETCONF · distributed SQL · observability

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