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module OpenTox
#PENDING: implement ot error api, move to own file
class Error
attr_accessor :code, :body, :uri, :payload, :headers
def initialize(code, body, uri, payload, headers)
self.code = code
self.body = body.to_s[0..1000]
self.uri = uri
self.payload = payload
self.headers = headers
end
def self.parse(error_array_string)
begin
err = YAML.load(error_array_string)
if err and err.is_a?(Array) and err.size>0 and err[0].is_a?(Error)
return err
else
return nil
end
rescue
return nil
end
end
end
class WrapperResult < String
attr_accessor :content_type, :code
end
class RestClientWrapper
# performs a GET REST call
# raises OpenTox::Error if call fails (rescued in overwrite.rb -> halt 502)
# per default: waits for Task to finish and returns result URI of Task
# @param [String] uri destination URI
# @param [optional,Hash] headers contains params like accept-header
# @param [optional,OpenTox::Task] waiting_task (can be a OpenTox::Subtask as well), progress is updated accordingly
# @param [wait,Boolean] wait set to false to NOT wait for task if result is task
# @return [OpenTox::WrapperResult] a String containing the result-body of the REST call
def self.get(uri, headers=nil, waiting_task=nil, wait=true )
execute( "get", uri, headers, nil, waiting_task, wait)
end
# performs a POST REST call
# raises OpenTox::Error if call fails (rescued in overwrite.rb -> halt 502)
# per default: waits for Task to finish and returns result URI of Task
# @param [String] uri destination URI
# @param [optional,Hash] headers contains params like accept-header
# @param [optional,String] payload data posted to the service
# @param [optional,OpenTox::Task] waiting_task (can be a OpenTox::Subtask as well), progress is updated accordingly
# @param [wait,Boolean] wait set to false to NOT wait for task if result is task
# @return [OpenTox::WrapperResult] a String containing the result-body of the REST call
def self.post(uri, headers, payload=nil, waiting_task=nil, wait=true )
execute( "post", uri, headers, payload, waiting_task, wait )
end
# performs a PUT REST call
# raises OpenTox::Error if call fails (rescued in overwrite.rb -> halt 502)
# @param [String] uri destination URI
# @param [optional,Hash] headers contains params like accept-header
# @param [optional,String] payload data put to the service
# @return [OpenTox::WrapperResult] a String containing the result-body of the REST call
def self.put(uri, headers, payload=nil )
execute( "put", uri, headers, payload )
end
# performs a DELETE REST call
# raises OpenTox::Error if call fails (rescued in overwrite.rb -> halt 502)
# @param [String] uri destination URI
# @param [optional,Hash] headers contains params like accept-header
# @return [OpenTox::WrapperResult] a String containing the result-body of the REST call
def self.delete(uri, headers=nil )
execute( "delete", uri, headers, nil)
end
# raises an Error message (rescued in overwrite.rb -> halt 502)
# usage: if the return value of a call is invalid
# @param [String] error_msg the error message
# @param [String] uri destination URI that is responsible for the error
# @param [optional,Hash] headers sent to the URI
# @param [optional,String] payload data sent to the URI
def self.raise_uri_error(error_msg, uri, headers=nil, payload=nil)
raise_ot_error( "-", error_msg, uri, headers, payload )
end
private
def self.execute( rest_call, uri, headers, payload=nil, waiting_task=nil, wait=true )
raise_ot_error 400,"uri is null",uri,headers,payload unless uri
raise_ot_error 400,"not a uri",uri,headers,payload unless uri.to_s.uri?
raise_ot_error 400,"headers are no hash",uri,headers,payload unless headers==nil or headers.is_a?(Hash)
raise_ot_error 400,"nil headers for post not allowed, use {}",uri,headers,payload if rest_call=="post" and headers==nil
headers.each{ |k,v| headers.delete(k) if v==nil } if headers #remove keys with empty values, as this can cause problems
begin
#LOGGER.debug "RestCall: "+rest_call.to_s+" "+uri.to_s+" "+headers.inspect
resource = RestClient::Resource.new(uri,{:timeout => 60})
if payload
result = resource.send(rest_call, payload, headers)
elsif headers
result = resource.send(rest_call, headers)
else
result = resource.send(rest_call)
end
# result is a string, with the additional fields content_type and code
res = WrapperResult.new(result.body)
res.content_type = result.headers[:content_type]
raise "content-type not set" unless res.content_type
res.code = result.code
# TODO: Ambit returns task representation with 200 instead of result URI
return res if res.code==200 || !wait
while (res.code==201 || res.code==202)
res = wait_for_task(res, uri, waiting_task)
end
raise "illegal status code: '"+res.code.to_s+"'" unless res.code==200
return res
rescue RestClient::RequestTimeout => ex
raise_ot_error 408,ex.message,uri,headers,payload
rescue => ex
#raise ex
#raise "'"+ex.message+"' uri: "+uri.to_s
begin
code = ex.http_code
msg = ex.http_body
rescue
code = 500
msg = ex.to_s
end
raise_ot_error code,msg,uri,headers,payload
end
end
def self.wait_for_task( res, base_uri, waiting_task=nil )
task = nil
case res.content_type
when /application\/rdf\+xml/
task = OpenTox::Task.from_rdfxml(res)
when /yaml/
task = OpenTox::Task.from_yaml(res)
when /text\//
raise "uri list has more than one entry, should be a task" if res.content_type=~/text\/uri-list/ and res.split("\n").size > 1 #if uri list contains more then one uri, its not a task
task = OpenTox::Task.find(res.to_s.chomp) if res.to_s.uri?
else
raise "unknown content-type for task: '"+res.content_type.to_s+"'" #+"' content: "+res[0..200].to_s
end
LOGGER.debug "result is a task '"+task.uri.to_s+"', wait for completion"
task.wait_for_completion waiting_task
raise task.description unless task.completed? # maybe task was cancelled / error
res = WrapperResult.new task.result_uri
res.code = task.http_code
res.content_type = "text/uri-list"
return res
end
def self.raise_ot_error( code, body, uri, headers, payload=nil )
#build error
causing_errors = Error.parse(body)
if causing_errors
error = causing_errors + [Error.new(code, "subsequent error", uri, payload, headers)]
else
error = [Error.new(code, body, uri, payload, headers)]
end
#debug utility: write error to file
error_dir = "/tmp/ot_errors"
FileUtils.mkdir(error_dir) unless File.exist?(error_dir)
raise "could not create error dir" unless File.exist?(error_dir) and File.directory?(error_dir)
file_name = "error"
time=Time.now.strftime("%m.%d.%Y-%H:%M:%S")
count = 1
count+=1 while File.exist?(File.join(error_dir,file_name+"_"+time+"_"+count.to_s))
File.new(File.join(error_dir,file_name+"_"+time+"_"+count.to_s),"w").puts(body)
# handle error
# PENDING: always return yaml for now
# raising OpenTox::Error
# to handle the error yourself, put rest-call in begin, rescue block
# if the error is not caught:
# if we are in a task, the error is caught, logged, and task state is set to error in Task.as_task
# if we are in a default call, the error is handled in overwrite.rb to return 502 (according to OT API)
raise error.to_yaml
end
end
end
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