(Ruby) Lower-Level REST API Methods (Google Cloud Storage)

The FullRequest* methods, such as FullRequestBinary, FullRequestMultipart, FullRequestNoBody, FullRequestStream, FullRequestString, etc. are high-level REST API methods that both send the request and receive the response. It is often the case that an application needs make a REST call, but with a finer level of control. The Chilkat REST API provides this feature. An application can break a REST call into the following parts:

1. Send the HTTP request. (via the SendReq* methods)
2. Receive the HTTP response header. (ReadResponseHeader)
3. Receive the HTTP response body. (via the ReadRespBody* methods)

This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.
# It will create a bucket in Google Cloud Storage.

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

gAuth = Chilkat::CkAuthGoogle.new()
# Obtain an access token as shown in one of the following examples:
# See Get Access Token using a Service Account JSON Key
# See Get Access Token using a P12 File

rest = Chilkat::CkRest.new()

# Connect using TLS.
bAutoReconnect = true
success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect)

# Provide the authentication credentials (i.e. the access key)
success = rest.SetAuthGoogle(gAuth)

# Build the JSON request body for creating a bucket.
# The only required property is the "name", but we'll add more
# to make a better example..
jsonReqBody = Chilkat::CkJsonObject.new()
success = jsonReqBody.AddStringAt(-1,"name","chilkat-bucket-c")
success = jsonReqBody.AddStringAt(-1,"kind","storage#bucket")
success = jsonReqBody.AddStringAt(-1,"location","US")
success = jsonReqBody.AddObjectAt(-1,"versioning")

# pObjVersioning is a CkJsonObject
pObjVersioning = jsonReqBody.ObjectOf("versioning")
success = pObjVersioning.AddBoolAt(-1,"enabled",true)

# Show the HTTP request body we'll be sending.
print jsonReqBody.emit() + "\n";

# Add the required query parameter.
# See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert
success = rest.AddQueryParam("project","chilkattest-1050")

# Add the Content-Type HTTP request header.
success = rest.AddHeader("Content-Type","application/json; charset=UTF-8")

# Send the REST HTTP request.
success = rest.SendReqStringBody("POST","/storage/v1/b",jsonReqBody.emit())
if (success != true)
    print rest.lastErrorText() + "\n";
    exit
end

# Read the response header.
responseStatusCode = rest.ReadResponseHeader()
if (responseStatusCode < 0)
    # We were unable to receive the response header.
    print rest.lastErrorText() + "\n";
    exit
end

if (responseStatusCode != 200)
    # The response was not successful.  We'll still need to receive 
    # the response body, which may contain an error message from the server.
    # If the response has no body, then the method for reading the
    # response body can still be called.  It will simply return with an empty
    # response body.

    # We can examine the response header and status text:
    print "Response status text: " + rest.responseStatusText() + "\n";
    print "Response header: " + rest.responseHeader() + "\n";
end

# Read the response body.  In this case we're expecting it to be JSON..
responseBodyStr = rest.readRespBodyString()
if (rest.get_LastMethodSuccess() != true)
    # We were unable to receive the response body.
    # Note: If the response did not include a body (such as for cases where
    # the Content-Length header is 0, or if the response status code implicitly
    # indicates no body, then ReadRespBodyString returns cktrue, and the
    # responseBodyString will be an empty string.
    print rest.lastErrorText() + "\n";
    exit
end

# Show the JSON response.
print "Json Response: " + responseBodyStr + "\n";