HaxallClient
open_haxall_client
open_haxall_client(uri, username, password, ssl_context=None)
Context manager for opening and closing a session with a Haxall application. May help prevent accidentially leaving a session with the server open.
open_haxall_client
can be directly imported as follows:
from phable import open_haxall_client
Example:
from phable import open_haxall_client
uri = "http://localhost:8080/api/demo"
with open_haxall_client(uri, "su", "password") as client:
print(client.about())
Note: This context manager uses Project Haystack's close op, which was later introduced. Therefore the context manager may not work with earlier versions of Haxall.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
uri
|
str
|
URI of endpoint such as "http://host/api/myProj/". |
required |
username
|
str
|
Username for the API user. |
required |
password
|
str
|
Password for the API user. |
required |
ssl_context
|
ssl.SSLContext | None
|
Optional SSL context. If not provided, a SSL context with default settings is created and used. |
None
|
Source code in phable/haxall_client.py
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HaxallClient
Bases: phable.haystack_client.HaystackClient
A superset of HaystackClient
with support for Haxall specific operations.
Learn more about Haxall here.
Source code in phable/haxall_client.py
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commit_add
commit_add(recs)
Adds one or more new records to the database.
As a general rule you should not have an id
column in your commit grid.
However if you wish to predefine the id of the records, you can specify an id
column in the commit grid.
Commit access requires the API user to have admin permission.
Errors
After the request Grid
is successfully read by the server, the server
may respond with a Grid
that triggers one of the following errors to be
raised:
ErrorGridError
if the operation failsIncompleteDataError
if incomplete data is being returned
Additional info
See Haxall's Commit operation docs for more details here.
Example:
from phable import Marker, open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
# define the rec to add
rec = [{"dis": "TestRec", "testing": Marker(), "pytest": Marker()}]
with open_haxall_client(uri, username, password) as client:
# commit the rec and capture response
rec_added_grid = client.commit_add(rec)
Parameters:
Name | Type | Description | Default |
---|---|---|---|
recs
|
dict[str, typing.Any] | list[dict[str, typing.Any]] | phable.kinds.Grid
|
Records to be added to the database. |
required |
Returns:
Type | Description |
---|---|
phable.kinds.Grid
|
The full tag definitions for each of the newly added records. |
Source code in phable/haxall_client.py
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commit_remove
commit_remove(recs)
Removes one or more records from the database.
Commit access requires the API user to have admin permission.
Errors
An ErrorGridError
is raised if any of the recs do not exist on
the server.
Also, after the request Grid
is successfully read by the server, the server
may respond with a Grid
that triggers one of the following errors to be
raised:
ErrorGridError
if the operation failsIncompleteDataError
if incomplete data is being returned
Additional info
See Haxall's Commit operation docs for more details here.
Example:
from phable import Ref, open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
with open_haxall_client(uri, username, password) as client:
# query entire rec you want to delete to get the mod tag
rec = client.read_by_id(Ref("2e9ab42e-c9822ff9"))
# delete the rec
client.commit_remove(rec)
Parameters:
Name | Type | Description | Default |
---|---|---|---|
recs
|
dict[str, typing.Any] | list[dict[str, typing.Any]] | phable.kinds.Grid
|
Records to be removed from the database. Each record (or row) must at
minimum define |
required |
Returns:
Type | Description |
---|---|
phable.kinds.Grid
|
An empty |
Source code in phable/haxall_client.py
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commit_update
commit_update(recs)
Updates one or more existing records within the database.
Commit access requires the API user to have admin permission.
Errors
After the request Grid
is successfully read by the server, the server
may respond with a Grid
that triggers one of the following errors to be
raised:
ErrorGridError
if the operation failsIncompleteDataError
if incomplete data is being returned
Additional info
See Haxall's Commit operation docs for more details here.
Example:
from phable import Ref, open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
with open_haxall_client(uri, username, password) as client:
# query entire rec we want to modify to get the mod tag
rec = client.read_by_id(Ref("2e9ab42e-c9822ff9"))
# define new tag to add to rec
rec["foo"] = "new tag"
# commit update to rec and capture response
rec_modified_grid = client.commit_update(rec)
Parameters:
Name | Type | Description | Default |
---|---|---|---|
recs
|
dict[str, typing.Any] | list[dict[str, typing.Any]] | phable.kinds.Grid
|
Existing records within the database to be updated. Each record (or
row) must at minimum have tags for the rec's existing |
required |
Returns:
Type | Description |
---|---|
phable.kinds.Grid
|
The latest full tag definitions for each of the updated records. |
Source code in phable/haxall_client.py
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eval
eval(expr)
Evaluates an Axon string expression.
Errors
After the request Grid
is successfully read by the server, the server
may respond with a Grid
that triggers one of the following errors to be
raised:
ErrorGridError
if the operation failsIncompleteDataError
if incomplete data is being returned
Additional info
See Haxall's Eval operation docs for more details here.
Example:
from phable import open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
# define an axon expression to evaluate on the server
axon_expr = "read(power and point and equipRef->siteMeter).hisRead(lastMonth)"
with open_haxall_client(uri, username, password) as client:
his_grid = client.eval(axon_expr)
his_df_meta, his_df = his_grid.to_polars_all()
Parameters:
Name | Type | Description | Default |
---|---|---|---|
expr
|
str
|
Axon string expression. |
required |
Returns:
Type | Description |
---|---|
phable.kinds.Grid
|
|
Source code in phable/haxall_client.py
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file_get
file_get(remote_file_uri)
Fetches content from a file on the server and returns a buffered binary stream.
The data in the HTTP response is not logged since a buffered reader can only be read once.
Phable users should manually close the returned stream as shown in the example below.
Note: This method is experimental and subject to change.
Example:
from phable import open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
with open_haxall_client(uri, username, password) as client:
stream = client.file_get("/proj/demo/io/data.txt")
# write data from the stream to a local file called data.txt
with open("data.txt", "wb") as file:
file.write(stream.read())
# don't forget to close the stream when finished!
stream.close()
Parameters:
Name | Type | Description | Default |
---|---|---|---|
remote_file_uri
|
str
|
URI of the remote file that has content being fetched. |
required |
Returns:
Type | Description |
---|---|
io.BufferedReader
|
A buffered binary stream that is readable. |
Source code in phable/haxall_client.py
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file_post
file_post(stream, remote_file_uri)
Uploads a file to a project using the HTTP POST method.
If a file with the same name already exists on the server, then the uploaded file will be renamed.
Note: This method is experimental and subject to change.
Example:
from phable import open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
with open_haxall_client(uri, username, password) as client:
# use stream from local file data.txt to upload file on server
with open("data.txt", "rb") as file:
res_data = client.file_post(file, "/proj/demo/io/data.txt")
Raises:
Type | Description |
---|---|
ValueError
|
Server did not return a Grid with the URI that file content was written to. |
Parameters:
Name | Type | Description | Default |
---|---|---|---|
stream
|
io.BufferedReader
|
A buffered binary stream used for writing content to the remote file. |
required |
remote_file_uri
|
str
|
URI that file content is intended to be written to. |
required |
Returns:
Type | Description |
---|---|
dict[str, typing.Any]
|
A dictionary of data containing the URI the file content was written to. |
Source code in phable/haxall_client.py
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file_put
file_put(stream, remote_file_uri)
Uploads a file to a project using the HTTP PUT method.
If a file with the same name already exists on the server, then the existing file will be overwritten with the uploaded file.
Note: This method is experimental and subject to change.
Example:
from phable import open_haxall_client
# define these settings specific to your use case
uri = "http://localhost:8080/api/demo"
username = "<username>"
password = "<password>"
with open_haxall_client(uri, username, password) as client:
# use stream from local file data.txt to upload file on server
with open("data.txt", "rb") as file:
res_data = client.file_put(file, "/proj/demo/io/data.txt")
Raises:
Type | Description |
---|---|
ValueError
|
Server did not return a Grid with the URI that file content was written to. |
Parameters:
Name | Type | Description | Default |
---|---|---|---|
stream
|
io.BufferedReader
|
A buffered binary stream used for writing content to the remote file. |
required |
remote_file_uri
|
str
|
URI of the remote file that content will be written to. |
required |
Returns:
Type | Description |
---|---|
dict[str, typing.Any]
|
A dictionary of data containing the URI the file content was written to. |
Source code in phable/haxall_client.py
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