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muk_fields_lobject/fields.py

@@ -23,6 +23,7 @@ import re
 import hashlib
 import logging
 import psycopg2
+import tempfile
 
 from odoo import _
 from odoo import models, api, fields
@@ -46,7 +47,11 @@ class LargeObject(fields.Field):
         if isinstance(value, bytes):
             lobject.write(value)
         else:
-            lobject.write(value.read())
+            while True:
+                chunk = value.read(4096)
+                if not chunk:
+                    break
+                lobject.write(chunk)
         return lobject.oid
 
     def convert_to_record(self, value, record):
@@ -56,6 +61,22 @@ class LargeObject(fields.Field):
                 return human_size(lobject.seek(0, 2))
             elif record._context.get('oid'):
                 return lobject.oid
+            elif record._context.get('stream'):
+                file = tempfile.TemporaryFile()
+                while True:
+                    chunk = lobject.read(4096)
+                    if not chunk:
+                        file.seek(0)
+                        return file
+                    file.write(chunk)
             else:
                 return lobject.read()
-        return False
+        return False
+    
+    def convert_to_export(self, value, record):
+        if value:
+            lobject = record.env.cr._cnx.lobject(value, 'rb')
+            if record._context.get('export_raw_data'):
+                return lobject.read()
+            return base64.b64encode(lobject.read())
+        return ''

muk_fields_lobject/static/description/index.html

@@ -0,0 +1,89 @@
+<section class="oe_container">
+	<div class="oe_row oe_spaced">
+		<h2 class="oe_slogan">Web Client</h2>
+		<h3 class="oe_slogan">Web Client Extension</h3>
+		<h4 class="oe_slogan" style="font-size: 23px;">MuK IT GmbH -
+			www.mukit.at</h4>
+	</div>
+</section>
+
+<section class="oe_container">
+	<div class="oe_row oe_spaced">
+		<div class="oe_picture">
+			<h3 class="oe_slogan">Overview</h3>
+			<div class="oe_mt32"
+				style="padding-bottom: 10px; text-align: justify;">
+				<p>Provides a field to store bytes as PostgreSQL large objects.
+					PostgreSQL offers support for large objects, which provide
+					stream-style access to user data that is stored in a special
+					large-object structure. They are useful with data values too large
+					to be manipulated conveniently as a whole.</p>
+				<h5 style="padding-top: 10px;">Psycopg2 for Python</h5>
+				<p>
+					Psycopg allows access to the large object using the
+					<code>lobject</code>
+					class. Objects are generated using the
+					<code>connection.lobject()</code>
+					factory method. Data can be retrieved either as bytes or as Unicode
+					strings.
+				</p>
+				<p>
+					Psycopg large object support efficient import/export with file
+					system files using the
+					<code>lo_import()</code>
+					and
+					<code>lo_export()</code>
+					libpq functions.
+				</p>
+				<p>Changed in version 2.6: added support for large objects
+					greated than 2GB. Note that the support is enabled only if all the
+					following conditions are verified:</p>
+				<ul>
+					<li>the Python build is 64 bits;</li>
+					<li>the extension was built against at least libpq 9.3;</li>
+					<li>the server version is at least PostgreSQL 9.3
+						(server_version must be >= 90300).</li>
+				</ul>
+				<p>
+					If Psycopg was built with 64 bits large objects support (i.e. the
+					first two contidions above are verified), the
+					<code>psycopg2.__version__</code>
+					constant will contain the lo64 flag. If any of the contition is not
+					met several lobject methods will fail if the arguments exceed 2GB.
+				</p>
+			</div>
+
+			<pre>
+		    	<code>
+from odoo.addons.muk_fields_lobject import fields as lobject_fields
+
+class LargeObjectModel(models.Model):
+
+	data_content = lobject_fields.LargeObject(string="Data")
+
+	@api.multi
+    def data(self):
+        for record in self:
+        	bytes = record.data_content
+			oid = record.with_context({'oid': True}).data_content
+        	size = record.with_context({'bin_size': True}).data_content
+            stream = record.with_context({'stream': True}).data_content
+		    	</code>
+			</pre>
+		</div>
+	</div>
+</section>
+
+<section class="oe_container oe_dark" style="padding-top: 300px;">
+	<h3 class="oe_slogan">Help and Support</h3>
+	<div class="oe_slogan">
+		<a class="btn btn-primary btn-lg mt8" href="mailto:sale@mukit.at">
+			<i class="fa fa-envelope"></i> Email
+		</a> <a class="btn btn-primary btn-lg mt8"
+			href="https://mukit.at/page/contactus"> <i class="fa fa-phone"></i>
+			Contact
+		</a>
+	</div>
+	<img src="logo.png" style="width: 200px; margin-bottom: 20px;"
+		class="center-block">
+</section>