added support for redshift

blueshift.py

@@ -0,0 +1,97 @@
+import boto3
+import os
+import random
+import time
+import pyarrow as pa
+import pyarrow.dataset
+import pprint
+import json
+
+pp = pprint.PrettyPrinter(indent=4)
+
+class Redshift:
+    def __init__(self, profile, output, db=None, cluster=None):
+        self.session  = boto3.session.Session(profile_name=profile)
+        self.redshift = self.session.client("redshift-data")
+        self.output   = output
+        self.database = db
+        self.cluster  = cluster
+
+    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.redshift = handler.redshift
+        self.sql      = sql
+        self.out      = None
+
+    def run(self):
+        self.out = os.path.join(self.handler.output,
+                              str(random.random()))
+        query    = f"unload ({repr(self.sql)}) to {repr(self.out)} " + \
+                   f"iam_role default " + \
+                   f"format as {self.DATA_STYLE} " + \
+                   f"manifest"
+
+        resp  = self.redshift.execute_statement(Sql=query,
+                                                Database=self.handler.database,
+                                                ClusterIdentifier=self.handler.cluster)
+        self.query_id = resp['Id']
+        return resp
+
+    def status(self):
+        return self.info()['Status']
+
+    def info(self):
+        res = self.redshift.describe_statement(Id=self.query_id)
+        return res
+
+    def results(self):
+        tiedot = self.info()
+        status = tiedot['Status']
+
+        while status in ['SUBMITTED', 'PICKED', 'STARTED']:
+            time.sleep(5)
+            tiedot = self.info()
+            status = tiedot['Status']
+
+        if status == "FINISHED":
+            # Because we're using `UNLOAD`, we get a manifest of the files
+            # that make up our data.
+            files   = self.manifest(tiedot)
+            files   = [f.strip() for f in files if f.strip()] # filter empty
+
+            # TODO parallelize this
+            local   = [self.handler.download(f) for f in files]
+            self.ds = pa.dataset.dataset(local)
+
+            return self.ds
+        else:
+            print("Error:")
+            pp.pprint(tiedot)
+            return status # canceled or error
+
+    def manifest(self, tiedot):
+        manif = self.out + "manifest"
+        tmp   = self.handler.download(manif)
+        with open(tmp, "r") as f:
+            js = json.load(f)
+
+        return [e['url'] for e in js['entries']]
+
+
+

test.py

@@ -4,16 +4,17 @@ import pprint
 pp = pprint.PrettyPrinter(indent=4)
 
 athena = m.Athena("hay", "s3://haystac-pmo-athena/")
-query  = athena.query(
-"""SELECT *
-FROM trajectories.kitware
-WHERE ST_Disjoint(
-  ST_GeometryFromText('POLYGON((103.6 1.2151693, 103.6 1.5151693, 104.14797 1.5151693, 104.14797 1.2151693, 103.6 1.2151693))'),
-  ST_Point(longitude, latitude)
-)
-""")
+#query  = athena.query(
+#"""SELECT *
+#FROM trajectories.kitware
+#WHERE ST_Disjoint(
+#  ST_GeometryFromText('POLYGON((103.6 1.2151693, 103.6 1.5151693, 104.14797 1.5151693, 104.14797 1.2151693, 103.6 1.2151693))'),
+#  ST_Point(longitude, latitude)
+#)
+#""")
+query  = athena.query("select count(*) as count from trajectories.kitware")
 data   = query.results()
-print(data.head(10))
+pp.pprint(query.info()['Statistics'])
 
 # Everything *needs* to have a column in order for parquet to work, so scalar
 # values have to be assigned something, so here we use `as count` to create

test2.py

@@ -0,0 +1,13 @@
+import blueshift as b
+import pprint
+
+pp = pprint.PrettyPrinter(indent=4)
+
+red   = b.Redshift("hay", "s3://haystac-pmo-athena/",
+                   db="dev",
+                   cluster="redshift-cluster-1")
+query = red.query("select count(*) from myspectrum_schema.kitware")
+res = query.results()
+pp.pprint(res.head(10))
+pp.pprint(query.info())
+