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Methods and Executions programmatically": [[3, "rest-apis-interacting-with-methods-and-executions-programmatically"]]}, "indexentries": {}}) \ No newline at end of file diff --git a/build/html/usermanual/index.html b/build/html/usermanual/index.html index fea92ba..4674ea1 100644 --- a/build/html/usermanual/index.html +++ b/build/html/usermanual/index.html @@ -343,6 +343,7 @@ The technology and the list of available Runtimes is strictly related to type of

There are few input parameters that are used to govern the Method execution itself rather than providing input to the Method. In particular:

  • ccpimage as already told is required and it is used automatically during Launch phase in order to instantiate a container.

  • +
  • ccpnote is a special input field that when present is used to tag the executions in order to provide better visual feedback.

  • ccpmaxtime can be used to limit the maximum execution time of a Method. The value is expressed in seconds and it is capped by the maximum time configured for the Infrastructure.

  • ccpreplicas currently supported on Docker swarm based Infrastructures allows for creating multiple instances of a Method execution in order to obtain a coarse grained degree of parallelism.

@@ -493,6 +494,90 @@ The following is a representation of the data structure representing an Executio

REST APIs: Interacting with Methods and Executions programmatically

+

Most of the services that build up CCP are accessible programmatically via REST endpoints. +In particular, listing Methods (Jobs), executing them or getting infromation on running executions (jobStatus) are accessible through a standard API defined by OGC (Open Geospatial Consortium). +The REST API is Processes 1.2 described at (https://ogcapi.ogc.org/processes/) and can be considered a modern rework of the former WPS spcification.

+

The CCP REST API is documented as OpenAPI 3 specification at ().

+

Through the code generation widgets available in the UI elements described above, it is possible to obtain stubs that show how to interact programmatically with CCP in order to request a Method execution or re-execution and to monitor the evolution.

+

The following is an example code stub generated for the R programming language.

+
+
Example code for requesting a Method execution on CCP
+
 # Dependencies
+ library(httr)
+ library(jsonlite)
+ library(rstudioapi)
+
+ # Init
+ user = 'usrname'
+ context = 'a vre'
+ auth_ep = 'https://authep'
+ client_id = 'aclietnid'
+ ccp_ep = 'https://ccpep'
+
+ getToken <- function() {
+   #login
+   res = POST(auth_ep, body=list('grant_type'='password', 'client_id'=client_id, 'username'=user, 'password'=pwd), encode=c('form'), add_headers(c('Content-Type' = 'application/x-www-form-urlencoded')))
+   tok = fromJSON(content(res, 'text'))
+   #authorize
+   res = POST(auth_ep, body=list('grant_type'='urn:ietf:params:oauth:grant-type:uma-ticket', 'audience'=context), encode=c('form'), add_headers(c('Content-Type' = 'application/x-www-form-urlencoded', 'Authorization' = paste('Bearer', tok['access_token'], sep=' '))))
+   jwt = fromJSON(content(res, 'text'))['access_token']
+
+   return (jwt)
+ }
+
+ # request in JSON
+ request = fromJSON('{
+   "inputs":{
+     "ccpimage":"bash",
+     "ccpreplicas":"1"
+   },
+   "outputs":{
+     "output":{
+       "transmissionMode":"value"
+     }
+   },
+   "response":"raw"
+ }')
+
+ # Auth code
+ pwd = askForPassword('Password to login')
+ jwt = getToken()
+
+ # Request Method execution
+ url = paste(ccp_ep, 'processes/{methodid}/execution', sep='/')
+ res = POST(url, body=request, encode = 'json', add_headers(c('Authorization' = paste('Bearer', jwt, sep=' '))))
+ if(status_code(res) == 201){
+   jobStatus = fromJSON(content(res, 'text'))
+ }else{
+   stop(paste('Unable to start execution:', content(res, 'text')))
+ }
+
+ # Poll for jobstatus
+ url = paste(ccp_ep, 'jobs', jobStatus['jobID'], sep='/')
+ while (jobStatus['status'] != 'successful' && jobStatus['status'] != 'failed'){
+   print(paste('[',Sys.time(),']',jobStatus['status'],': ',jobStatus['message']))
+   Sys.sleep(5)
+   res = GET(url, add_headers(c('Authorization' = paste('Bearer', jwt, sep=' '))))
+   if(status_code(res) == 200){
+     jobStatus = fromJSON(content(res, 'text'))
+   }else if(status_code(res) == 401){
+     jwt = getToken()
+   }else{
+     stop('Unable to poll for execution status')
+   }
+ }
+
+ print(paste('[',Sys.time(),']',jobStatus['status'],': ',jobStatus['message']))
+ url = paste(ccp_ep, 'executions', jobStatus['jobID'], sep='/')
+ res = GET(url, add_headers(c('Accept' = 'application/json', 'Authorization' = paste('Bearer', jwt, sep=' '))))
+ print(fromJSON(content(res, 'text')))
+
+ url = paste(ccp_ep, 'executions', jobStatus['jobID'], 'outputs/output.zip', sep='/')
+ GET(url, add_headers(c('Accept' = 'application/json', 'Authorization' = paste('Bearer', jwt, sep=' '))),
+     write_disk('./output.zip', overwrite = FALSE))
+
+
+
diff --git a/source/usermanual/index.rst b/source/usermanual/index.rst index ed56f39..38525ca 100644 --- a/source/usermanual/index.rst +++ b/source/usermanual/index.rst @@ -276,6 +276,7 @@ All **input parameters** are passed in the form of template variables to the scr There are few input parameters that are used to govern the Method execution itself rather than providing input to the Method. In particular: - **ccpimage** as already told is required and it is used automatically during *Launch* phase in order to instantiate a container. +- **ccpnote** is a special input field that when present is used to tag the executions in order to provide better visual feedback. - **ccpmaxtime** can be used to limit the maximum execution time of a Method. The value is expressed in seconds and it is capped by the maximum time configured for the Infrastructure. - **ccpreplicas** currently supported on Docker swarm based Infrastructures allows for creating multiple instances of a Method execution in order to obtain a coarse grained degree of parallelism. @@ -439,3 +440,90 @@ The list of Executions are organized by their Method names [1]. For every Method REST APIs: Interacting with Methods and Executions programmatically ------------------------------------------------------------------- + +Most of the services that build up CCP are accessible programmatically via REST endpoints. +In particular, listing Methods (Jobs), executing them or getting infromation on running executions (jobStatus) are accessible through a standard API defined by OGC (Open Geospatial Consortium). +The REST API is Processes 1.2 described at (https://ogcapi.ogc.org/processes/) and can be considered a modern rework of the former WPS spcification. + +The CCP REST API is documented as OpenAPI 3 specification at (). + +Through the code generation widgets available in the UI elements described above, it is possible to obtain stubs that show how to interact programmatically with CCP in order to request a Method execution or re-execution and to monitor the evolution. + +The following is an example code stub generated for the R programming language. + +.. code-block:: R + :caption: Example code for requesting a Method execution on CCP + + # Dependencies + library(httr) + library(jsonlite) + library(rstudioapi) + + # Init + user = 'usrname' + context = 'a vre' + auth_ep = 'https://authep' + client_id = 'aclietnid' + ccp_ep = 'https://ccpep' + + getToken <- function() { + #login + res = POST(auth_ep, body=list('grant_type'='password', 'client_id'=client_id, 'username'=user, 'password'=pwd), encode=c('form'), add_headers(c('Content-Type' = 'application/x-www-form-urlencoded'))) + tok = fromJSON(content(res, 'text')) + #authorize + res = POST(auth_ep, body=list('grant_type'='urn:ietf:params:oauth:grant-type:uma-ticket', 'audience'=context), encode=c('form'), add_headers(c('Content-Type' = 'application/x-www-form-urlencoded', 'Authorization' = paste('Bearer', tok['access_token'], sep=' ')))) + jwt = fromJSON(content(res, 'text'))['access_token'] + + return (jwt) + } + + # request in JSON + request = fromJSON('{ + "inputs":{ + "ccpimage":"bash", + "ccpreplicas":"1" + }, + "outputs":{ + "output":{ + "transmissionMode":"value" + } + }, + "response":"raw" + }') + + # Auth code + pwd = askForPassword('Password to login') + jwt = getToken() + + # Request Method execution + url = paste(ccp_ep, 'processes/{methodid}/execution', sep='/') + res = POST(url, body=request, encode = 'json', add_headers(c('Authorization' = paste('Bearer', jwt, sep=' ')))) + if(status_code(res) == 201){ + jobStatus = fromJSON(content(res, 'text')) + }else{ + stop(paste('Unable to start execution:', content(res, 'text'))) + } + + # Poll for jobstatus + url = paste(ccp_ep, 'jobs', jobStatus['jobID'], sep='/') + while (jobStatus['status'] != 'successful' && jobStatus['status'] != 'failed'){ + print(paste('[',Sys.time(),']',jobStatus['status'],': ',jobStatus['message'])) + Sys.sleep(5) + res = GET(url, add_headers(c('Authorization' = paste('Bearer', jwt, sep=' ')))) + if(status_code(res) == 200){ + jobStatus = fromJSON(content(res, 'text')) + }else if(status_code(res) == 401){ + jwt = getToken() + }else{ + stop('Unable to poll for execution status') + } + } + + print(paste('[',Sys.time(),']',jobStatus['status'],': ',jobStatus['message'])) + url = paste(ccp_ep, 'executions', jobStatus['jobID'], sep='/') + res = GET(url, add_headers(c('Accept' = 'application/json', 'Authorization' = paste('Bearer', jwt, sep=' ')))) + print(fromJSON(content(res, 'text'))) + + url = paste(ccp_ep, 'executions', jobStatus['jobID'], 'outputs/output.zip', sep='/') + GET(url, add_headers(c('Accept' = 'application/json', 'Authorization' = paste('Bearer', jwt, sep=' '))), + write_disk('./output.zip', overwrite = FALSE)) \ No newline at end of file