Initial commit

access.py

@@ -0,0 +1,82 @@
+import boto3
+import os
+import random
+import time
+import pyarrow as pa
+import pyarrow.dataset
+import pprint
+
+pp = pprint.PrettyPrinter(indent=4)
+
+class Athena:
+    def __init__(self, profile, output):
+        self.session = boto3.session.Session(profile_name=profile)
+        self.athena  = self.session.client("athena")
+        self.output  = output
+
+    def query(self, sql):
+        q = Query(self, sql)
+        q.run()
+        return q
+
+    def download(self, s3):
+        bucket = s3.split("/")[2]
+        file   = os.path.join(*s3.split("/")[3:])
+        tmp    = f"/tmp/{random.random()}.bin"
+        self.session.client('s3').download_file(bucket, file, tmp)
+
+        return tmp
+
+class Query:
+    DATA_STYLE = 'parquet'
+
+    def __init__(self, handler, sql):
+        self.handler = handler
+        self.athena  = handler.athena
+        self.sql     = sql
+
+    def run(self):
+        out    = os.path.join(self.handler.output,
+                              str(random.random()))
+        config = {"OutputLocation": out}
+        query  = f"unload ({self.sql}) to {repr(out)} " + \
+                 f"with (format = '{self.DATA_STYLE}')"
+
+        resp  = self.athena.start_query_execution(QueryString=query,
+                                                  ResultConfiguration=config)
+        self.query_id = resp['QueryExecutionId']
+        return resp
+
+    def status(self):
+        return self.info()['Status']
+
+    def info(self):
+        res = self.athena.get_query_execution(QueryExecutionId=self.query_id)
+        return res['QueryExecution']
+
+    def results(self):
+        tiedot = self.info()
+        status = tiedot['Status']['State']
+
+        while status in ['QUEUED', 'RUNNING']:
+            time.sleep(5)
+            status = self.status()['State']
+
+        if status == "SUCCEEDED":
+            # Because we're using `UNLOAD`, we get a manifest of the files
+            # that make up our data.
+            files   = self.manifest(tiedot).strip().split("\n")
+            local   = [self.handler.download(f) for f in files]
+            self.ds = pa.dataset.dataset(local)
+
+            return self.ds
+        else:
+            return status # canceled or error
+
+    def manifest(self, tiedot):
+        manif = tiedot['Statistics']['DataManifestLocation']
+        tmp   = self.handler.download(manif)
+        with open(tmp, "r") as f:
+            return f.read()
+
+