stale[bot] closed pull request #3229: [AIRFLOW-2325] Add cloudwatch task 
handler (IN PROGRESS)
URL: https://github.com/apache/incubator-airflow/pull/3229
 
 
   

This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:

As this is a foreign pull request (from a fork), the diff is supplied
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diff --git a/airflow/utils/log/cloudwatch_task_handler.py 
b/airflow/utils/log/cloudwatch_task_handler.py
new file mode 100644
index 0000000000..97e67b8c89
--- /dev/null
+++ b/airflow/utils/log/cloudwatch_task_handler.py
@@ -0,0 +1,124 @@
+# -*- coding: utf-8 -*-
+import os
+import logging
+
+import boto3
+import watchtower
+from jinja2 import Template
+from airflow import configuration
+from airflow.utils.log.logging_mixin import LoggingMixin
+
+
+class CloudwatchTaskHandler(logging.Handler, LoggingMixin):
+    def __init__(self, log_group, filename_template, region_name=None, 
**kwargs):
+        super(CloudwatchTaskHandler, self).__init__()
+        self.handler = None
+        self.log_group = log_group
+        self.region_name = region_name
+        self.filename_template = filename_template
+        self.filename_jinja_template = None
+        self.kwargs = kwargs
+        self.closed = False
+
+        if "{{" in self.filename_template: #jinja mode
+            self.filename_jinja_template = Template(self.filename_template)
+
+    def _render_filename(self, ti, try_number):
+        if self.filename_jinja_template:
+            jinja_context = ti.get_template_context()
+            jinja_context['try_number'] = try_number
+            return (
+                self.filename_jinja_template.render(**jinja_context)
+                .replace(':', '_')
+            )
+
+        return self.filename_template.format(
+            dag_id=ti.dag_id,
+            task_id=ti.task_id,
+            execution_date=ti.execution_date.isoformat(),
+            try_number=try_number,
+        ).replace(':', '_')
+
+    def set_context(self, ti):
+        kwargs = self.kwargs.copy()
+        stream_name = kwargs.pop('stream_name', None)
+        if stream_name is None:
+            stream_name = self._render_filename(ti, ti.try_number)
+        if 'boto3_session' not in kwargs and self.region_name is not None:
+            kwargs['boto3_session'] = boto3.session.Session(
+                region_name=self.region_name,
+            )
+        self.handler = watchtower.CloudWatchLogHandler(
+            log_group=self.log_group,
+            stream_name=stream_name,
+            **kwargs
+        )
+    
+    def emit(self, record):
+        if self.handler is not None:
+            self.handler.emit(record)
+
+    def flush(self):
+        if self.handler is not None:
+            self.handler.flush()
+
+    def close(self):
+        """
+        Close and upload local log file to remote storage S3.
+        """
+        # When application exit, system shuts down all handlers by
+        # calling close method. Here we check if logger is already
+        # closed to prevent uploading the log to remote storage multiple
+        # times when `logging.shutdown` is called.
+        if self.closed:
+            return
+
+        if self.handler is not None:
+            self.handler.close()
+        # Mark closed so we don't double write if close is called twice
+        self.closed = True
+
+    def read(self, task_instance, try_number=None):
+        if try_number is None:
+            next_try = task_instance.next_try_number
+            try_numbers = list(range(1, next_try))
+        elif try_number < 1:
+            logs = [
+                'Error fetching the logs. Try number {try_number} is invalid.',
+            ]
+            return logs
+        else:
+            try_numbers = [try_number]
+
+        logs = [''] * len(try_numbers)
+        for i, try_number in enumerate(try_numbers):
+            logs[i] += self._read(task_instance, try_number)
+        
+        return logs
+    
+    def _read(self, task_instance, try_number):
+        stream_name = self._render_filename(task_instance, try_number)
+        if self.handler is not None:
+            client = self.handler.cwl_client
+        else:
+            client = boto3.client('logs', region_name=self.region_name)
+        events = []
+        try:
+            response = client.get_log_events(
+                logGroupName=self.log_group,
+                logStreamName=stream_name,
+            )
+            events.extend(response['events'])
+            next_token = response['nextForwardToken']
+            while True:
+                response = client.get_log_events(
+                    logGroupName=self.log_group,
+                    logStreamName=stream_name,
+                )
+                if next_token == response['nextForwardToken']:
+                    break
+                events.extend(response['events'])
+                next_token = response['nextForwardToken']
+        except client.exceptions.ResourceNotFoundException:
+            return f'Log stream {stream_name} does not exist'
+        return '\n'.join(event['message'] for event in events)


 

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