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# EXAMPLE: pipe_trans_tutorial
# HIDE_START
"""
Code samples for vector database quickstart pages:
https://redis.io/docs/latest/develop/get-started/vector-database/
"""
# HIDE_END
import redis
# STEP_START basic_pipe
r = redis.Redis(decode_responses=True)
# REMOVE_START
for i in range(5):
r.delete(f"seat:{i}")
r.delete("shellpath")
# REMOVE_END
pipe = r.pipeline()
for i in range(5):
pipe.set(f"seat:{i}", f"#{i}")
set_5_result = pipe.execute()
print(set_5_result) # >>> [True, True, True, True, True]
pipe = r.pipeline()
# "Chain" pipeline commands together.
get_3_result = pipe.get("seat:0").get("seat:3").get("seat:4").execute()
print(get_3_result) # >>> ['#0', '#3', '#4']
# STEP_END
# REMOVE_START
assert set_5_result == [True, True, True, True, True]
assert get_3_result == ['#0', '#3', '#4']
# REMOVE_END
# STEP_START trans_watch
r.set("shellpath", "/usr/syscmds/")
with r.pipeline() as pipe:
# Repeat until successful.
while True:
try:
# Watch the key we are about to change.
pipe.watch("shellpath")
# The pipeline executes commands directly (instead of
# buffering them) from immediately after the `watch()`
# call until we begin the transaction.
current_path = pipe.get("shellpath")
new_path = current_path + ":/usr/mycmds/"
# Start the transaction, which will enable buffering
# again for the remaining commands.
pipe.multi()
pipe.set("shellpath", new_path)
pipe.execute()
# The transaction succeeded, so break out of the loop.
break
except redis.WatchError:
# The transaction failed, so continue with the next attempt.
continue
get_path_result = r.get("shellpath")
print(get_path_result) # >>> '/usr/syscmds/:/usr/mycmds/'
# STEP_END
# REMOVE_START
assert get_path_result == '/usr/syscmds/:/usr/mycmds/'
r.delete("shellpath")
# REMOVE_END
# STEP_START watch_conv_method
r.set("shellpath", "/usr/syscmds/")
def watched_sequence(pipe):
current_path = pipe.get("shellpath")
new_path = current_path + ":/usr/mycmds/"
pipe.multi()
pipe.set("shellpath", new_path)
trans_result = r.transaction(watched_sequence, "shellpath")
print(trans_result) # True
get_path_result = r.get("shellpath")
print(get_path_result) # >>> '/usr/syscmds/:/usr/mycmds/'
# REMOVE_START
assert trans_result
assert get_path_result == '/usr/syscmds/:/usr/mycmds/'
# REMOVE_END
# STEP_END
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