;
; NOSA HEADER START
;
; The contents of this file are subject to the terms of the NASA Open
; Source Agreement (NOSA), Version 1.3 only (the "Agreement"). You may
; not use this file except in compliance with the Agreement.
;
; You can obtain a copy of the agreement at
; docs/NASA_Open_Source_Agreement_1.3.txt
; or
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;
; See the Agreement for the specific language governing permissions
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; When distributing Covered Code, include this NOSA HEADER in each
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; following below this NOSA HEADER, with the fields enclosed by
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; Portions Copyright [yyyy] [name of copyright owner]
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; NOSA HEADER END
;
; Copyright (c) 2010-2021 United States Government as represented by the
; National Aeronautics and Space Administration. No copyright is claimed
; in the United States under Title 17, U.S.Code. All Other Rights Reserved.
;
;
;+
; This class represents an object that is used to report HTTP errors.<br>
;
; Notes:
; <ol>
; <li>This class exists in both the CDAS and SSC web service IDL
; libraries. They should be kept identical to void incompatiblities
; for clients that use both libraries simultaneously.</li>
; <li>As of release 1.7.35 of the CDAS library the retryAfterTime field
; and associated logic is obsolete. The SpdfRest class now handles
; a 429/503 http response with a Retry-After header itself and never
; calls this class for those responses. The code here has not yet been
; deleted because of note 1 above.</li>
; </ol>
;
; @copyright Copyright (c) 2010-2021 United States Government as represented
; by the National Aeronautics and Space Administration. No
; copyright is claimed in the United States under Title 17,
; U.S.Code. All Other Rights Reserved.
;
; @author B. Harris
;-
;+
; Creates an SpdfHttpErrorReporter object.
;
; @returns reference to an SpdfHttpErrorReporter object.
;-
function SpdfHttpErrorReporter::init
compile_opt idl2
return, self
end
;+
; Performs cleanup operations when this object is destroyed.
;-
pro SpdfHttpErrorReporter::cleanup
compile_opt idl2
end
;+
; This procedure is called when an HTTP error occurs. This default
; implementation merely prints some diagnostic information.
;
; @param responseCode {in} {type=int}
; the HTTP response code of the request causing the error.
; @param responseHeader {in} {type=string}
; the HTTP response header of the request causing the error.
; @param responseFilename {in} {type=string}
; the name of an error response file sent when the error
; occurred.
;-
pro SpdfHttpErrorReporter::reportError, $
responseCode, responseHeader, responseFilename
compile_opt idl2
case responseCode of
429 || 503: begin
print, 'An HTTP 429/503 error has occurred.'
<span class="comments">;</span>
<span class="comments">; Currently, SSC/CDAS never sends a date/time string (only </span>
<span class="comments">; number of seconds to wait) in the Retry-After header. If </span>
<span class="comments">; it ever starts, then the following code will have to be </span>
<span class="comments">; updated to handle that.</span>
<span class="comments">;</span>
retryAfter = stregex(responseHeader, $
'Retry-After: ([0-9]+)' + string(13b), $
/extract, /subexpr)
if n_elements(retryAfter) eq 2 && $
strlen(retryAfter[1]) gt 0 then begin
self.retryAfterTime = systime(/seconds) + fix(retryAfter[1])
endif
end
else: begin
print, 'An HTTP error has occurred.'
print, !error_state.msg
print, 'HTTP response code = ', responseCode
print, 'HTTP response header = ', responseHeader
if n_elements(responseFilename) ne 0 then begin
print, 'HTTP response filename = ', responseFilename
self->printResponse, responseFilename
endif
end
endcase
end
;+
; This procedure prints some diagnostic information from the given
; HTTP error response file. It only recognizes the “typical” error
; response from the web services.
;
; @param responseFilename {in} {type=string}
; the name of an error response file sent when the error
; occurred.
;-
pro SpdfHttpErrorReporter::printResponse, $
responseFilename
compile_opt idl2
if strlen(responseFilename) eq 0 then return
print, 'HTTP Error Response'
response = obj_new('IDLffXMLDOMDocument', filename=responseFilename)
pElements = response->getElementsByTagName('p')
for i = 0, pElements->getLength() - 1 do begin
pNode = pElements->item(i)
pAttributes = pNode->getAttributes()
pClassAttribute = pAttributes->getNamedItem('class')
if obj_valid(pClassAttribute) then begin
pClassValue = pClassAttribute->getNodeValue()
pLastChild = pNode->getLastChild()
if obj_valid(pLastChild) then begin
pLastChildValue = pLastChild->getNodeValue()
print, pClassValue, ': ', pLastChildValue
endif else begin
print, pClassValue
endelse
endif
endfor
obj_destroy, response
end
;+
; Suspends execution until after any retryAfterTime. If there has been
; no HTTP 429/503/RetryAfter condition or the current time is after the
; retryAfterTime, then no suspension occurs.
;-
pro SpdfHttpErrorReporter::waitUntilRetryAfterTime
compile_opt idl2
waitTime = self.retryAfterTime - systime(/seconds)
if waitTime gt 0.0 then wait, waitTime
end
;+
; Gets the retryAfterTime value.
;
; @returns the number of seconds elapsed since 1970-01-01 when we can
; retry a request following an HTTP response with status 429/503
; and an HTTP Retry-After header value.
;-
function SpdfHttpErrorReporter::getRetryAfterTime
compile_opt idl2
return, self.retryAfterTime
end
;+
; Defines the SpdfHttpErrorReporter class.
;
; @field retryAfterTime number of seconds elapsed since 1970-01-01 when
; we can retry a request following an HTTP response with status 429/503
; and an HTTP Retry-After header value.
;-
pro SpdfHttpErrorReporter__define
compile_opt idl2
struct = { SpdfHttpErrorReporter,
}
end