(Tcl) Azure Storage: Lease Container

Azure Storage Blob Service REST API: Sample code to establishes a lock on a container for delete operations. The lock duration can be 15 to 60 seconds, or can be infinite.

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load ./chilkat.dll

# Azure Blob Service Example: Lease Container
# See also: https://msdn.microsoft.com/en-us/library/azure/jj159103.aspx

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set rest [new_CkRest]

# Connect to the Azure Storage Blob Service
set bTls 1
set port 443
set bAutoReconnect 1
# In this example, the storage account name is "chilkat".
set success [CkRest_Connect $rest "chilkat.blob.core.windows.net" $port $bTls $bAutoReconnect]
if {$success != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    exit
}

# Provide Azure Cloud credentials for the REST call.
set azAuth [new_CkAuthAzureStorage]

CkAuthAzureStorage_put_AccessKey $azAuth "AZURE_ACCESS_KEY"
# The account name used here should match the 1st part of the domain passed in the call to Connect (above).
CkAuthAzureStorage_put_Account $azAuth "chilkat"
CkAuthAzureStorage_put_Scheme $azAuth "SharedKey"
CkAuthAzureStorage_put_Service $azAuth "Blob"
# This causes the "x-ms-version: 2020-08-04" header to be automatically added.
CkAuthAzureStorage_put_XMsVersion $azAuth "2020-08-04"
set success [CkRest_SetAuthAzureStorage $rest $azAuth]

# Note: The application does not need to explicitly set the following
# headers: x-ms-date, Authorization.  These headers
# are automatically set by Chilkat.

# The lease ID needs to be a GUID.  (UUID and GUID are synonymous)
set crypt [new_CkCrypt2]

set guid [CkCrypt2_generateUuid $crypt]
puts "Lease ID: $guid"
set success [CkRest_AddHeader $rest "x-ms-lease-id" $guid]

# The action can be "acquire", "renew", "change", "release", or "break".
# See https://msdn.microsoft.com/en-us/library/azure/jj159103.aspx
set success [CkRest_AddHeader $rest "x-ms-lease-action" "acquire"]

# The lease duration..
set success [CkRest_AddHeader $rest "x-ms-lease-duration" "15"]

# In this example, we are acquiring a lease for the container named "mycontainer".
set responseStr [CkRest_fullRequestNoBody $rest "PUT" "/mycontainer?restype=container&comp=lease"]
if {[CkRest_get_LastMethodSuccess $rest] != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkAuthAzureStorage $azAuth
    delete_CkCrypt2 $crypt
    exit
}

# When successful, the Azure Storage service will respond with a 200, 201, or 202 response status code,
# with no response body.

# The status code depends on the operation:
#    Acquire: A successful operation returns status code 201 (Created).
#    Renew: A successful operation returns status code 200 (OK).
#    Change: A successful operation returns status code 200 (OK).
#    Release: A successful operation returns status code 200 (OK).
#    Break: A successful operation returns status code 202 (Accepted).

if {expr [[CkRest_get_ResponseStatusCode $rest] < 200]  ||  [[CkRest_get_ResponseStatusCode $rest] > 202]} then {
    # Examine the request/response to see what happened.
    puts "response status code = [CkRest_get_ResponseStatusCode $rest]"
    puts "response status text = [CkRest_responseStatusText $rest]"
    puts "response header: [CkRest_responseHeader $rest]"
    puts "response body (if any): $responseStr"
    puts "---"
    puts "LastRequestStartLine: [CkRest_lastRequestStartLine $rest]"
    puts "LastRequestHeader: [CkRest_lastRequestHeader $rest]"
    delete_CkRest $rest
    delete_CkAuthAzureStorage $azAuth
    delete_CkCrypt2 $crypt
    exit
}

puts "Success: Lease acquired."

delete_CkRest $rest
delete_CkAuthAzureStorage $azAuth
delete_CkCrypt2 $crypt