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sampleserver.go
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sampleserver.go
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package main
// A simple PACS server. Supports C-STORE, C-FIND, C-MOVE.
//
// Usage: ./sampleserver -dir <directory> -port 11111
//
// It starts a DICOM server and serves files under <directory>.
import (
"crypto/tls"
"crypto/x509"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"path/filepath"
"regexp"
"strings"
"sync"
"github.com/azubkokshe/go-dicom"
"github.com/azubkokshe/go-dicom/dicomio"
"github.com/azubkokshe/go-dicom/dicomtag"
"github.com/azubkokshe/go-dicom/dicomuid"
"github.com/azubkokshe/go-netdicom"
"github.com/azubkokshe/go-netdicom/dimse"
)
var (
portFlag = flag.String("port", "10000", "TCP port to listen to")
aeFlag = flag.String("ae", "bogusae", "AE title of this server")
remoteAEFlag = flag.String("remote-ae", "GBMAC0261:localhost:11112", `
Comma-separated list of remote AEs, in form aetitle:host:port, For example -remote-ae testae:foo.example.com:12345,testae2:bar.example.com:23456.
In this example, a C-GET or C-MOVE request to application entity "testae" will resolve to foo.example.com:12345.`)
dirFlag = flag.String("dir", ".", `
The directory to locate DICOM files to report in C-FIND, C-MOVE, etc.
Files are searched recursivsely under this directory.
Defaults to '.'.`)
outputFlag = flag.String("output", "", `
The directory to store files received by C-STORE.
If empty, use <dir>/incoming, where <dir> is the value of the -dir flag.`)
tlsKeyFlag = flag.String("tls-key", "", "Sets the private key file. If empty, TLS is disabled.")
tlsCertFlag = flag.String("tls-cert", "", "File containing TLS cert to be presented to the peer.")
tlsCAFlag = flag.String("tls-ca", "", "Optional file containing certs to match against what peers present.")
)
type server struct {
mu *sync.Mutex
// Set of dicom files the server manages. Keys are file paths. Guarded
// by mu.
datasets map[string]*dicom.DataSet
// For generating new unique path in C-STORE. Guarded by mu.
pathSeq int32
}
func (ss *server) onCStore(
transferSyntaxUID string,
sopClassUID string,
sopInstanceUID string,
data []byte) dimse.Status {
ss.mu.Lock()
defer ss.mu.Unlock()
ss.pathSeq++
path := path.Join(*outputFlag, fmt.Sprintf("image%04d.dcm", ss.pathSeq))
out, err := os.Create(path)
if err != nil {
dirPath := filepath.Dir(path)
err := os.MkdirAll(dirPath, 0755)
if err != nil {
return dimse.Status{Status: dimse.StatusNotAuthorized, ErrorComment: err.Error()}
}
out, err = os.Create(path)
if err != nil {
log.Printf("%s: create: %v", path, err)
return dimse.Status{Status: dimse.StatusNotAuthorized, ErrorComment: err.Error()}
}
}
defer func() {
if out != nil {
out.Close()
}
}()
e := dicomio.NewEncoderWithTransferSyntax(out, transferSyntaxUID)
dicom.WriteFileHeader(e,
[]*dicom.Element{
dicom.MustNewElement(dicomtag.TransferSyntaxUID, transferSyntaxUID),
dicom.MustNewElement(dicomtag.MediaStorageSOPClassUID, sopClassUID),
dicom.MustNewElement(dicomtag.MediaStorageSOPInstanceUID, sopInstanceUID),
})
e.WriteBytes(data)
if err := e.Error(); err != nil {
log.Printf("%s: write: %v", path, err)
return dimse.Status{Status: dimse.StatusNotAuthorized, ErrorComment: err.Error()}
}
err = out.Close()
out = nil
if err != nil {
log.Printf("%s: close %s", path, err)
return dimse.Status{Status: dimse.StatusNotAuthorized, ErrorComment: err.Error()}
}
log.Printf("C-STORE: Created %v", path)
// Register the new file in ss.datasets.
ds, err := dicom.ReadDataSetFromFile(path, dicom.ReadOptions{DropPixelData: true})
if err != nil {
log.Printf("%s: failed to parse dicom file: %v", path, err)
} else {
ss.datasets[path] = ds
}
return dimse.Success
}
// Represents a match.
type filterMatch struct {
path string // DICOM path name
elems []*dicom.Element // Elements within "ds" that match the filter
}
// "filters" are matching conditions specified in C-{FIND,GET,MOVE}. This
// function returns the list of datasets and their elements that match filters.
func (ss *server) findMatchingFiles(filters []*dicom.Element) ([]filterMatch, error) {
ss.mu.Lock()
defer ss.mu.Unlock()
var matches []filterMatch
for path, ds := range ss.datasets {
allMatched := true
match := filterMatch{path: path}
for _, filter := range filters {
ok, elem, err := dicom.Query(ds, filter)
if err != nil {
return matches, err
}
if !ok {
log.Printf("DS: %s: filter %v missed", path, filter)
allMatched = false
break
}
if elem != nil {
match.elems = append(match.elems, elem)
} else {
elem, err := dicom.NewElement(filter.Tag)
if err != nil {
log.Println(err)
return matches, err
}
match.elems = append(match.elems, elem)
}
}
if allMatched {
if len(match.elems) == 0 {
panic(match)
}
matches = append(matches, match)
}
}
return matches, nil
}
func (ss *server) onCFind(
transferSyntaxUID string,
sopClassUID string,
filters []*dicom.Element,
ch chan netdicom.CFindResult) {
for _, filter := range filters {
log.Printf("CFind: filter %v", filter)
}
log.Printf("CFind: transfersyntax: %v, classuid: %v",
dicomuid.UIDString(transferSyntaxUID),
dicomuid.UIDString(sopClassUID))
// Match the filter against every file. This is just for demonstration
matches, err := ss.findMatchingFiles(filters)
log.Printf("C-FIND: found %d matches, err %v", len(matches), err)
if err != nil {
ch <- netdicom.CFindResult{Err: err}
} else {
for _, match := range matches {
log.Printf("C-FIND resp %s: %v", match.path, match.elems)
ch <- netdicom.CFindResult{Elements: match.elems}
}
}
close(ch)
}
func (ss *server) onCMoveOrCGet(
transferSyntaxUID string,
sopClassUID string,
filters []*dicom.Element,
ch chan netdicom.CMoveResult) {
log.Printf("C-MOVE: transfersyntax: %v, classuid: %v",
dicomuid.UIDString(transferSyntaxUID),
dicomuid.UIDString(sopClassUID))
for _, filter := range filters {
log.Printf("C-MOVE: filter %v", filter)
}
matches, err := ss.findMatchingFiles(filters)
log.Printf("C-MOVE: found %d matches, err %v", len(matches), err)
if err != nil {
ch <- netdicom.CMoveResult{Err: err}
} else {
for i, match := range matches {
log.Printf("C-MOVE resp %d %s: %v", i, match.path, match.elems)
// Read the file; the one in ss.datasets lack the PixelData.
ds, err := dicom.ReadDataSetFromFile(match.path, dicom.ReadOptions{})
resp := netdicom.CMoveResult{
Remaining: len(matches) - i - 1,
Path: match.path,
}
if err != nil {
resp.Err = err
} else {
resp.DataSet = ds
}
ch <- resp
}
}
close(ch)
}
// Find DICOM files in or under "dir" and read its attributes. The return value
// is a map from a pathname to dicom.Dataset (excluding PixelData).
func listDicomFiles(dir string) (map[string]*dicom.DataSet, error) {
datasets := make(map[string]*dicom.DataSet)
readFile := func(path string) {
if _, ok := datasets[path]; ok {
return
}
ds, err := dicom.ReadDataSetFromFile(path, dicom.ReadOptions{DropPixelData: true})
if err != nil {
log.Printf("%s: failed to parse dicom file: %v", path, err)
return
}
log.Printf("%s: read dicom file", path)
datasets[path] = ds
}
walkCallback := func(path string, info os.FileInfo, err error) error {
if err != nil {
log.Printf("%v: skip file: %v", path, err)
return nil
}
if (info.Mode() & os.ModeDir) != 0 {
// If a directory contains file "DICOMDIR", all the files in the directory are DICOM files.
if _, err := os.Stat(filepath.Join(path, "DICOMDIR")); err != nil {
return nil
}
subpaths, err := filepath.Glob(path + "/*")
if err != nil {
log.Printf("%v: glob: %v", path, err)
return nil
}
for _, subpath := range subpaths {
if !strings.HasSuffix(subpath, "DICOMDIR") {
readFile(subpath)
}
}
return nil
}
if strings.HasSuffix(path, ".dcm") {
readFile(path)
}
return nil
}
if err := filepath.Walk(dir, walkCallback); err != nil {
return nil, err
}
return datasets, nil
}
func parseRemoteAEFlag(flag string) (map[string]string, error) {
aeMap := make(map[string]string)
re := regexp.MustCompile("^([^:]+):(.+)$")
for _, str := range strings.Split(flag, ",") {
if str == "" {
continue
}
m := re.FindStringSubmatch(str)
if m == nil {
return aeMap, fmt.Errorf("Failed to parse AE spec '%v'", str)
}
log.Printf("Remote AE '%v' -> '%v'", m[1], m[2])
aeMap[m[1]] = m[2]
}
return aeMap, nil
}
func canonicalizeHostPort(addr string) string {
if !strings.Contains(addr, ":") {
return ":" + addr
}
return addr
}
func main() {
flag.Parse()
port := canonicalizeHostPort(*portFlag)
if *outputFlag == "" {
*outputFlag = filepath.Join(*dirFlag, "incoming")
}
remoteAEs, err := parseRemoteAEFlag(*remoteAEFlag)
if err != nil {
log.Panicf("Failed to parse -remote-ae flag: %v", err)
}
datasets, err := listDicomFiles(*dirFlag)
if err != nil {
log.Panicf("Failed to list DICOM files in %s: %v", *dirFlag, err)
}
ss := server{
mu: &sync.Mutex{},
datasets: datasets,
}
log.Printf("Listening on %s", port)
var tlsConfig *tls.Config
if *tlsKeyFlag != "" {
cert, err := tls.LoadX509KeyPair(*tlsCertFlag, *tlsKeyFlag)
if err != nil {
log.Panic(err)
}
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cert},
}
if *tlsCAFlag != "" {
ca, err := ioutil.ReadFile(*tlsCAFlag)
if err != nil {
log.Panic(err)
}
tlsConfig.RootCAs = x509.NewCertPool()
tlsConfig.RootCAs.AppendCertsFromPEM(ca)
tlsConfig.BuildNameToCertificate()
}
}
params := netdicom.ServiceProviderParams{
AETitle: *aeFlag,
RemoteAEs: remoteAEs,
CEcho: func(connState netdicom.ConnectionState) dimse.Status {
log.Printf("Received C-ECHO")
return dimse.Success
},
CFind: func(connState netdicom.ConnectionState, transferSyntaxUID string, sopClassUID string,
filter []*dicom.Element, ch chan netdicom.CFindResult) {
ss.onCFind(transferSyntaxUID, sopClassUID, filter, ch)
},
CMove: func(connState netdicom.ConnectionState, transferSyntaxUID string, sopClassUID string,
filter []*dicom.Element, ch chan netdicom.CMoveResult) {
ss.onCMoveOrCGet(transferSyntaxUID, sopClassUID, filter, ch)
},
CGet: func(connState netdicom.ConnectionState, transferSyntaxUID string, sopClassUID string,
filter []*dicom.Element, ch chan netdicom.CMoveResult) {
ss.onCMoveOrCGet(transferSyntaxUID, sopClassUID, filter, ch)
},
CStore: func(connState netdicom.ConnectionState, transferSyntaxUID string,
sopClassUID string,
sopInstanceUID string,
data []byte) dimse.Status {
return ss.onCStore(transferSyntaxUID, sopClassUID, sopInstanceUID, data)
},
TLSConfig: tlsConfig,
}
sp, err := netdicom.NewServiceProvider(params, port)
if err != nil {
panic(err)
}
sp.Run()
}