Asynch. API

[egate.git] / zlayer / zaccess.c

diff --git a/zlayer/zaccess.c b/zlayer/zaccess.c
index 0420161..6d7bc9f 100644 (file)
--- a/zlayer/zaccess.c
+++ b/zlayer/zaccess.c
@@ -4,7 +4,10 @@
  * Z39.50 API for the Email gateway
  *
  * $Log: zaccess.c,v $
- * Revision 1.15  1995/04/17 11:26:55  quinn
+ * Revision 1.16  1995/04/20 15:25:34  quinn
+ * Asynch. API
+ *
+ * Revision 1.15  1995/04/17  11:26:55  quinn
  * Added YAZ version of zaccess
  *
  * Revision 1.14  1995/02/23  08:32:26  adam
@@ -49,7 +52,18 @@
  */
 
 /*
- * Interface to the Z39.50 toolkit.
+ * Interface to the Z39.50 toolkit. Primary function is to hide Zdist, or
+ * whatever lower-layer we decide to use later. The decision to add a
+ * layer atop the toolkit was twofold: It vastly simplifies the
+ * implementation of the protocol persistence, and it hides Zdist. The
+ * latter is useful after Zdist has gone and changed their fine API after
+ * we went through all the trouble of documenting it in our Design. Don't
+ * want that to happen again.
+ *
+ * For the time being at least, we'll have these routines hang (or err) if
+ * they get a WOULDBLOCK on a write. That seems safe since, under normal
+ * circumstances, the network buffers should always be able to absorb
+ * the small request packages.
  */
 
 #include <stdlib.h>
@@ -121,7 +135,38 @@ int rpn2kwaqs(struct ccl_rpn_node *q, char **p)
     }
 }
 
-ZASS zass_open(char *host, int port)
+int zass_openresult(ZASS p, int *complete)
+{
+    int len;
+    PINITRESPONSE ires;
+
+    if ((len = zutil_GetBERFromNet(p->ass, (unsigned char*)p->buf,
+       p->maxrecordsize)) <= 0)
+    {
+       gw_log(GW_LOG_FATAL, ZASS_TYPE, "Failed to receive initresponse");
+       return 0;
+    }
+    ires = (PINITRESPONSE) zutil_CreateFromData((unsigned char*)p->buf, len);
+    if (InitResponse_GetTag(ires) != INITRESPONSE_TAG)
+    {
+       gw_log(GW_LOG_FATAL, ZASS_TYPE, "Expected initresponse from target");
+       return 0;
+    }
+    gw_log(ZASS_DEBUG, ZASS_TYPE, "Got initresponse");
+    if (!InitResponse_GetResult(ires))
+    {
+       gw_log(GW_LOG_FATAL, ZASS_TYPE, "Access to target denied.");
+       return 0;
+    }
+    gw_log(ZASS_DEBUG, ZASS_TYPE, "Connected OK");
+    p->preferredmessagesize = InitResponse_GetPreferredMessageSize(ires);
+    p->maxrecordsize = InitResponse_GetExceptionalRecordSize(ires);
+    InitResponse_Destroy(ires);
+    *complete = 1;
+    return 0;
+}
+
+ZASS zass_open(char *host, int port, int *complete)
 {
     struct zass *p;
     PINITREQUEST ireq;
@@ -156,8 +201,8 @@ ZASS zass_open(char *host, int port)
        gw_log(GW_LOG_WARN, ZASS_TYPE, "netbox_Open failed");
        return 0;
     }
-    gw_log(ZASS_DEBUG, ZASS_TYPE, "Opened connection to %s:%d", p->ass->HostName,
-       p->ass->Port);
+    gw_log(ZASS_DEBUG, ZASS_TYPE, "Opened connection to %s:%d",
+        p->ass->HostName, p->ass->Port);
     sprintf(name, "%s (ZDIST protocol layer)", ZASS_NAME);
     ireq = InitRequest_CreateInitAllASCII(0, "yy", "yy", p->maxrecordsize,
        p->preferredmessagesize, ZASS_ID, name, ZASS_VERSION, 0);
@@ -180,29 +225,12 @@ ZASS zass_open(char *host, int port)
        return 0;
     }
     gw_log(ZASS_DEBUG, ZASS_TYPE, "Sent initrequest.");
-    if ((len = zutil_GetBERFromNet(p->ass, (unsigned char*)p->buf,
-       p->maxrecordsize)) <= 0)
-    {
-       gw_log(GW_LOG_FATAL, ZASS_TYPE, "Failed to receive initresponse");
-       return 0;
-    }
-    ires = (PINITRESPONSE) zutil_CreateFromData((unsigned char*)p->buf, len);
-    if (InitResponse_GetTag(ires) != INITRESPONSE_TAG)
-    {
-       gw_log(GW_LOG_FATAL, ZASS_TYPE, "Expected initresponse from target");
-       return 0;
-    }
-    gw_log(ZASS_DEBUG, ZASS_TYPE, "Got initresponse");
-    if (!InitResponse_GetResult(ires))
-    {
-       gw_log(GW_LOG_FATAL, ZASS_TYPE, "Access to target denied.");
+
+    if (zass_openresult(p, complete) < 0 && (!complete || *complete))
        return 0;
-    }
-    gw_log(ZASS_DEBUG, ZASS_TYPE, "Connected OK");
-    p->preferredmessagesize = InitResponse_GetPreferredMessageSize(ires);
-    p->maxrecordsize = InitResponse_GetExceptionalRecordSize(ires);
-    InitResponse_Destroy(ires);
-    return p;
+    else
+       return p;
+
 }
 
 const struct zass_searchent *zass_search(ZASS a, struct ccl_rpn_node *query,