source: FOIAVistA/trunk/r/HEALTH_LEVEL_SEVEN-HL/HLOCLNT1.m@ 1635

HLOCLNT1 ;IRMFO-ALB/CJM - Writing messages, reading acks;03/24/2004  14:43 ;07/10/2007
 ;;1.6;HEALTH LEVEL SEVEN;**126,130,131,134,137**;Oct 13, 1995;Build 21
 ;Per VHA Directive 2004-038, this routine should not be modified.
 ;
 ;
WRITEMSG(HLCSTATE,HLMSTATE) ;
 ;Description:  This function uses the services offered by the transport layer to send a message over an open communication channel.
 ;
 ;Input:
 ;  HLCSTATE (pass by reference, required) Defines the LLP & its state
 ;  HLMSTATE (pass by reference, required) The message
 ;Output:
 ;  Function returns 1 on success, 0 on failure
 ;
 N SEG,QUIT,HDR
 S QUIT=0
 Q:'$G(HLMSTATE("IEN")) 0
 S HDR(1)=HLMSTATE("HDR",1),HDR(2)=HLMSTATE("HDR",2)
 Q:'$$WRITEHDR^HLOT(.HLCSTATE,.HDR) 0
 I HLMSTATE("BATCH") D
 .N LAST S LAST=0
 .S HLMSTATE("BATCH","CURRENT MESSAGE")=0
 .F  Q:'$$NEXTMSG^HLOMSG(.HLMSTATE,.SEG)  D  Q:QUIT
 ..S LAST=HLMSTATE("BATCH","CURRENT MESSAGE")
 ..I '$$WRITESEG^HLOT(.HLCSTATE,.SEG) S QUIT=1 Q
 ..F  Q:'$$HLNEXT^HLOMSG(.HLMSTATE,.SEG)  D  Q:QUIT
 ...I '$$WRITESEG^HLOT(.HLCSTATE,.SEG) S QUIT=1 Q
 .K SEG S SEG(1)="BTS"_HLMSTATE("HDR","FIELD SEPARATOR")_LAST
 .S:'$$WRITESEG^HLOT(.HLCSTATE,.SEG) QUIT=1
 E  D
 .F  Q:'$$HLNEXT^HLOMSG(.HLMSTATE,.SEG)  D  Q:QUIT
 ..S:'$$WRITESEG^HLOT(.HLCSTATE,.SEG) QUIT=1
 S:'$$ENDMSG^HLOT(.HLCSTATE) QUIT=1
 Q 'QUIT
 ;
READACK(HLCSTATE,HDR,MSA) ;
 ;Description:  This function uses the services offered by the transport layer to read an accept ack.
 ;
 ;Input:
 ;  HLCSTATE (pass by reference, required) Defines the communication channel and its state.
 ;Output:
 ;  Function returns 1 on success, 0 on failure
 ;  HDR (pass by reference) the message header:
 ;   HDR(1) is components 1-6
 ;   HDR(2) is components 7-end
 ;  MSA (pass by reference) the MSA segment as an unsubscripted variable
 ;
 N SEG
 K HDR,MSA,MAX,I
 S MAX=HLCSTATE("SYSTEM","MAXSTRING")-40 ;MAX is the maximum that can be safely stored on a node, leaving room for the other fields stored with MSA seg
 Q:'$$READHDR^HLOT(.HLCSTATE,.HDR) 0
 F  Q:'$$READSEG^HLOT(.HLCSTATE,.SEG)  D
 .I $E($E(SEG(1),1,3)_$E($G(SEG(2)),1,3),1,3)="MSA" D
 ..S MSA=""
 ..F I=1:1 Q:'$D(SEG(I))  S MSA=MSA_$S((MAX-$L(MSA))<1:"",1:$E(SEG(I),1,MAX))
 I $D(MSA),HLCSTATE("MESSAGE ENDED") D  Q 1
 .D SPLITHDR^HLOSRVR1(.HDR)
 .S HLCSTATE("COUNTS","ACKS")=$G(HLCSTATE("COUNTS","ACKS"))+1
 Q 0
 ;
CONNECT(LINK,PORT,TIMEOUT,HLCSTATE) ;
 ;sets up HLCSTATE() and opens a client connection
 ;Input:
 ;  LINK - name of the link to connect to
 ;  PORT (optional) port # to connect to, defaults to that specified by the link
 ;  TIMEOUT (optional) specifies the open timeout in seconds, defaults to 30
 ;Output:
 ;   HLCSTATE - array to hold the connection state
 ;
 I $G(HLCSTATE("CONNECTED")) D  Q:HLCSTATE("CONNECTED")
 .I $G(HLCSTATE("LINK","NAME"))]"",($G(HLCSTATE("LINK","NAME"))'=LINK) D CLOSE^HLOT(.HLCSTATE) Q
 .I $G(HLCSTATE("LINK","NAME"))]"",$G(PORT),($G(HLCSTATE("LINK","PORT"))'=PORT) D CLOSE^HLOT(.HLCSTATE) Q
 .I (HLCSTATE("SYSTEM","OS")="CACHE") D  Q
 ..U HLCSTATE("DEVICE") S HLCSTATE("CONNECTED")=($ZA\8192#2)
 ..I 'HLCSTATE("CONNECTED") D CLOSE^HLOT(.HLCSTATE)
 .;D CLOSE^HLOT(.HLCSTATE)
 K HLCSTATE
 N ARY,NODE
 I '$$GETLINK^HLOTLNK(LINK,.ARY) S HLCSTATE("LINK","NAME")=LINK,HLCSTATE("LINK","PORT")=$G(PORT) D LINKDOWN^HLOCLNT(.HLCSTATE) Q 0
 M HLCSTATE("LINK")=ARY
 I HLCSTATE("LINK","SHUTDOWN") S HLCSTATE("CONNECTED")=0 D LINKDOWN^HLOCLNT(.HLCSTATE) Q 0
 ;overlay the port if supplied from the queue
 S:$G(PORT) HLCSTATE("LINK","PORT")=PORT
 S HLCSTATE("READ TIMEOUT")=20
 S HLCSTATE("OPEN TIMEOUT")=$S($G(TIMEOUT):TIMEOUT,1:30)
 S HLCSTATE("COUNTS")=0
 S HLCSTATE("READ")="" ;where the reads are stored
 ;
 ;HLCSTATE("BUFFER",<seg>,<line>) serves as a write buffer so that a lot can be written all at once
 S HLCSTATE("BUFFER","BYTE COUNT")=0 ;count of BYTES in buffer
 S HLCSTATE("BUFFER","SEGMENT COUNT")=0 ;count of segments in buffer
 ;
 S HLCSTATE("MESSAGE ENDED")=0 ;end of message flag
 S NODE=^%ZOSF("OS")
 S HLCSTATE("SERVER")=0
 S HLCSTATE("SYSTEM","OS")=$S(NODE["DSM":"DSM",NODE["OpenM":"CACHE",NODE["G.TM":"G.TM",1:"")
 I HLCSTATE("SYSTEM","OS")="" D LINKDOWN^HLOCLNT(.HLCSTATE) Q 0
 D
 .N SYS
 .D SYSPARMS^HLOSITE(.SYS)
 .S HLCSTATE("SYSTEM","BUFFER")=SYS("HL7 BUFFER")
 .S HLCSTATE("SYSTEM","MAXSTRING")=SYS("MAXSTRING")
 .S HLCSTATE("SYSTEM","NORMAL PURGE")=SYS("NORMAL PURGE")
 .S HLCSTATE("SYSTEM","ERROR PURGE")=SYS("ERROR PURGE")
 I HLCSTATE("LINK","LLP")="TCP" D
 .S HLCSTATE("OPEN")="OPEN^HLOTCP"
 E  ;no other LLP implemented
 D OPEN^HLOT(.HLCSTATE)
 ;
 ;mark the failure time for the link so other processes know not to try for a while
 I 'HLCSTATE("CONNECTED") D LINKDOWN^HLOCLNT(.HLCSTATE)
 Q HLCSTATE("CONNECTED")
 ;
BADMSGS(WORK) ;
 ;finds messages that won't transmit after 8 hours of trying and takes them off the outgoing queue
 N LINK
 S LINK=""
 F  S LINK=$O(^HLTMP("FAILING LINKS",LINK)) Q:LINK=""  D
 .N TIME,QUE,COUNT
 .S TIME=$G(^HLTMP("FAILING LINKS",LINK)) Q:TIME=""
 .Q:$$HDIFF^XLFDT($H,TIME,2)<28800  ;8 hours
 .Q:'$$IFOPEN^HLOUSR1(LINK)
 .L +^HLB("QUEUE","OUT",LINK):0
 .S QUE=""
 .F  S QUE=$O(^HLB("QUEUE","OUT",LINK,QUE)) Q:QUE=""  D
 ..N MSG S MSG=0
 ..S MSG=$O(^HLB("QUEUE","OUT",LINK,QUE,MSG))
 ..Q:'MSG
 ..S COUNT=$G(^HLB(MSG,"TRIES"))
 ..I COUNT>20 D
 ...N NODE0,NODE1,NODE2,TIME,RAPP,SAPP,FS,CS,ACTION,MTYPE,EVENT
 ...S NODE0=$G(^HLB(MSG,0))
 ...Q:'$P(NODE0,"^",2)
 ...S TIME=$$NOW^XLFDT
 ...S NODE1=$G(^HLB(MSG,1))
 ...S NODE2=$G(^HLB(MSG,2))
 ...S FS=$E(NODE1,4)
 ...Q:FS=""
 ...S CS=$E(NODE1,5)
 ...Q:CS=""
 ...S SAPP=$P(NODE1,FS,3)
 ...S:SAPP="" SAPP="UNKNOWN"
 ...S RAPP=$P(NODE1,FS,5)
 ...S MTYPE=$P($P(NODE2,FS,4),CS)
 ...S EVENT=$P($P(NODE2,FS,4),CS,2)
 ...S $P(^HLB(MSG,0),"^",21)=COUNT_" FAILED TRANSMISSIONS"
 ...S $P(^HLB(MSG,0),"^",20)="TF"
 ...S ^HLB("ERRORS",RAPP,TIME,MSG)=""
 ...D COUNT^HLOESTAT("OUT",RAPP,SAPP,MTYPE,EVENT)
 ...S ACTION=$P(NODE0,"^",14,15)
 ...I ACTION'="^",ACTION]"" D INQUE^HLOQUE(LINK,QUE,MSG,ACTION,1)
 ...D DEQUE^HLOQUE(LINK,QUE,"OUT",MSG)
 .L -^HLB("QUEUE","OUT",LINK)
 Q