[PATCH v2 5/5] cli: lazily create the crypto gpg context only when needed

[Jameson Graef Rollins <jrollins@finestructure.net>]

Move the creation of the crypto ctx into mime-node.c and create it
only when needed.  This removes code duplication from notmuch-show and
notmuch-reply, and should speed up these functions considerably if the
crypto flags are provided but the messages don't have any
cryptographic parts.
---
 mime-node.c      |   25 +++++++++++++++++++++++++
 notmuch-client.h |    3 ++-
 notmuch-reply.c  |   19 -------------------
 notmuch-show.c   |   23 -----------------------
 4 files changed, 27 insertions(+), 43 deletions(-)

diff --git a/mime-node.c b/mime-node.c
index 3adbe5a..592e0b6 100644
--- a/mime-node.c
+++ b/mime-node.c
@@ -182,6 +182,31 @@ _mime_node_create (mime_node_t *parent, GMimeObject *part)
 	return NULL;
     }
 
+    /* Lazily create the gpgctx if it's needed and hasn't been initialized yet */
+    if ((GMIME_IS_MULTIPART_ENCRYPTED (part) || GMIME_IS_MULTIPART_SIGNED (part))
+	&& (node->ctx->crypto->verify || node->ctx->crypto->decrypt)) {
+	if (!node->ctx->crypto->gpgctx) {
+#ifdef GMIME_ATLEAST_26
+	    /* TODO: GMimePasswordRequestFunc */
+	    node->ctx->crypto->gpgctx = g_mime_gpg_context_new (NULL, "gpg");
+#else
+	    GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
+	    node->ctx->crypto->gpgctx = g_mime_gpg_context_new (session, "gpg");
+	    g_object_unref (session);
+#endif
+	    if (node->ctx->crypto->gpgctx) {
+		g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) node->ctx->crypto->gpgctx, FALSE);
+	    } else {
+		/* If we fail to create the gpgctx set the verify and
+		 * decrypt flags to FALSE so we don't try to do any
+		 * further verification or decryption */
+		node->ctx->crypto->verify = FALSE;
+		node->ctx->crypto->decrypt = FALSE;
+		fprintf (stderr, "Failed to construct gpg context.\n");
+	    }
+	}
+    }
+
     /* Handle PGP/MIME parts */
     if (GMIME_IS_MULTIPART_ENCRYPTED (part) && node->ctx->crypto->decrypt) {
 	if (node->nchildren != 2) {
diff --git a/notmuch-client.h b/notmuch-client.h
index c671c13..c79eaa9 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -348,7 +348,8 @@ struct mime_node {
 /* Construct a new MIME node pointing to the root message part of
  * message. If crypto->verify is true, signed child parts will be
  * verified. If crypto->decrypt is true, encrypted child parts will be
- * decrypted.
+ * decrypted.  The GPG context crypto->gpgctx does not need to be
+ * pre-initialized as it will be initialized lazily as needed.
  *
  * Return value:
  *
diff --git a/notmuch-reply.c b/notmuch-reply.c
index 345be76..1a61aa7 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -707,25 +707,6 @@ notmuch_reply_command (void *ctx, int argc, char *argv[])
     else
 	reply_format_func = notmuch_reply_format_default;
 
-    if (crypto.decrypt) {
-#ifdef GMIME_ATLEAST_26
-	/* TODO: GMimePasswordRequestFunc */
-	crypto.gpgctx = g_mime_gpg_context_new (NULL, "gpg");
-#else
-	GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
-	crypto.gpgctx = g_mime_gpg_context_new (session, "gpg");
-#endif
-	if (crypto.gpgctx) {
-	    g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) crypto.gpgctx, FALSE);
-	} else {
-	    crypto.decrypt = FALSE;
-	    fprintf (stderr, "Failed to construct gpg context.\n");
-	}
-#ifndef GMIME_ATLEAST_26
-	g_object_unref (session);
-#endif
-    }
-
     config = notmuch_config_open (ctx, NULL, NULL);
     if (config == NULL)
 	return 1;
diff --git a/notmuch-show.c b/notmuch-show.c
index f4ee038..5f785d0 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -1056,29 +1056,6 @@ notmuch_show_command (void *ctx, unused (int argc), unused (char *argv[]))
 	break;
     }
 
-    if (params.crypto.decrypt || params.crypto.verify) {
-#ifdef GMIME_ATLEAST_26
-	/* TODO: GMimePasswordRequestFunc */
-	params.crypto.gpgctx = g_mime_gpg_context_new (NULL, "gpg");
-#else
-	GMimeSession* session = g_object_new (g_mime_session_get_type(), NULL);
-	params.crypto.gpgctx = g_mime_gpg_context_new (session, "gpg");
-#endif
-	if (params.crypto.gpgctx) {
-	    g_mime_gpg_context_set_always_trust ((GMimeGpgContext*) params.crypto.gpgctx, FALSE);
-	} else {
-	    /* If we fail to create the gpgctx set the verify and
-	     * decrypt flags to FALSE so we don't try to do any
-	     * further verification or decryption */
-	    params.crypto.verify = FALSE;
-	    params.crypto.decrypt = FALSE;
-	    fprintf (stderr, "Failed to construct gpg context.\n");
-	}
-#ifndef GMIME_ATLEAST_26
-	g_object_unref (session);
-#endif
-    }
-
     config = notmuch_config_open (ctx, NULL, NULL);
     if (config == NULL)
 	return 1;
-- 
1.7.10