Page MenuHomePhabricator
Create Task
Maniphest T368531

Result of a function call is sometimes not there
Closed, ResolvedPublicBUG REPORT
Actions

Description

Steps to replicate the issue (include links if applicable):

What happens?: Under "result", is says running, then it disappears without showing an actual result

What should have happened instead?: It should have shown the result there and the details

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.): Browser is Firefox

Details

SubjectRepoBranchLines +/-
Fix response envelope format when API catches ClientException or ServerExceptionmediawiki/extensions/WikiLambdamaster+7 -6
Customize query in gerrit

Related Objects

Event Timeline

ScienceD90 created this task.Jun 26 2024, 12:47 PM
Jdforrester-WMF added a project: WikiLambda Front-end.Jun 26 2024, 4:38 PM
Jdforrester-WMF subscribed.

I see an "Uncaught promise" when executing; malformed response triggering bad behaviour in the function evaluator widget? Whatever happens, we should show "something went wrong" rather than just die. :-)

Jdforrester-WMF triaged this task as Medium priority.Jun 26 2024, 4:38 PM
Jdforrester-WMF moved this task from To triage to 25Q1 (Jul–Sep) on the Abstract Wikipedia team board.
Jdforrester-WMF edited projects, added Abstract Wikipedia team (25Q1 (Jul–Sep)); removed Abstract Wikipedia team.
Jdforrester-WMF moved this task from Incoming to Bugs to investigate on the Abstract Wikipedia team (25Q1 (Jul–Sep)) board.Jun 26 2024, 5:00 PM
DVrandecic subscribed.Jun 26 2024, 6:34 PM

This might be the same as T360331

DVrandecic added a comment.Jun 26 2024, 6:37 PM

I found a simpler place where the same behavior can be observed:
https://www.wikifunctions.org/view/en/Z10174

Can also be seen on the one connected implementation:
https://www.wikifunctions.org/view/en/Z11223

I get the following error message when clicking Run function:

TypeError: Cannot read properties of undefined (reading 'Z1K1')
    at Proxy.typeToString (typeUtils.js:160:55)
    at Proxy.type (ZObjectKeyValue.vue:339:17)
    at ue.fn (vue.js:7:14050)
    at ue.run (vue.js:7:6593)
    at get value (vue.js:7:14297)
    at Object.get [as type] (vue.js:9:5772)
    at Object.get (vue.js:9:3863)
    at Proxy.hasExpandedMode (ZObjectKeyValue.vue:395:13)
    at ue.fn (vue.js:7:14050)
    at ue.run (vue.js:7:6593)

I don't know if this is the same error as above or as on T360331 but it sure looks the same.

DVrandecic raised the priority of this task from Medium to High.Jun 26 2024, 6:41 PM
DVrandecic added a comment.Jun 26 2024, 6:45 PM

Screenshot 2024-06-26 at 11.45.04.png (662×454 px, 41 KB)

ScienceD90 added a comment.Jun 26 2024, 6:47 PM

I am not seeing that behavior on the implementation of and, just the function.

DVrandecic added a comment.Jun 26 2024, 7:01 PM

Oh, weird. Indeed, can confirm, I cannot see it on the implementation Z11223 anymore.

99of9 subscribed.Jun 27 2024, 2:42 AM
gengh subscribed.EditedJun 27 2024, 8:26 AM

The object returned by the orchestrator has no Z22K1, which is causing the front-end to crash as it expects the key to be always present in a Z22.

This is the response of calling the Z10174/And function, returning "Service unavailable" in a badly formed Z22:

{
    "query": {
        "wikilambda_function_call": {
            "data": {
                "Z1K1": "Z22",
                "Z22K2": {
                    "Z1K1": {
                        "Z1K1": "Z7",
                        "Z7K1": "Z883",
                        "Z883K1": "Z6",
                        "Z883K2": "Z1"
                    },
                    "K1": [
                        {
                            "Z1K1": "Z7",
                            "Z7K1": "Z882",
                            "Z882K1": "Z6",
                            "Z882K2": "Z1"
                        },
                        {
                            "Z1K1": {
                                "Z1K1": "Z7",
                                "Z7K1": "Z882",
                                "Z882K1": "Z6",
                                "Z882K2": "Z1"
                            },
                            "K1": "errors",
                            "K2": {
                                "Z1K1": "Z5",
                                "Z5K1": "Z507",
                                "Z5K2": {
                                    "Z1K1": {
                                        "Z1K1": "Z7",
                                        "Z7K1": "Z885",
                                        "Z885K1": "Z507"
                                    },
                                    "K1": {
                                        "Z1K1": "Z99",
                                        "Z99K1": {
                                            "Z1K1": "Z7",
                                            "Z7K1": "Z10174",
                                            "Z10174K1": {
                                                "Z1K1": "Z40",
                                                "Z40K1": "Z41"
                                            },
                                            "Z10174K2": {
                                                "Z1K1": "Z40",
                                                "Z40K1": "Z41"
                                            }
                                        }
                                    },
                                    "K2": {
                                        "Z1K1": "Z5",
                                        "Z5K1": "Z500",
                                        "Z5K2": {
                                            "Z1K1": {
                                                "Z1K1": "Z7",
                                                "Z7K1": "Z885",
                                                "Z885K1": "Z500"
                                            },
                                            "K1": "Service Unavailable"
                                        }
                                    }
                                }
                            }
                        }
                    ]
                }
            }
        }
    }
}

Sometimes the issue is "Service unavailable" and sometimes "Gateway timeout", like this response from Z17225/Quoted value by key:

{
    "query": {
        "wikilambda_function_call": {
            "data": {
                "Z1K1": "Z22",
                "Z22K2": {
                    "Z1K1": {
                        "Z1K1": "Z7",
                        "Z7K1": "Z883",
                        "Z883K1": "Z6",
                        "Z883K2": "Z1"
                    },
                    "K1": [
                        {
                            "Z1K1": "Z7",
                            "Z7K1": "Z882",
                            "Z882K1": "Z6",
                            "Z882K2": "Z1"
                        },
                        {
                            "Z1K1": {
                                "Z1K1": "Z7",
                                "Z7K1": "Z882",
                                "Z882K1": "Z6",
                                "Z882K2": "Z1"
                            },
                            "K1": "errors",
                            "K2": {
                                "Z1K1": "Z5",
                                "Z5K1": "Z507",
                                "Z5K2": {
                                    "Z1K1": {
                                        "Z1K1": "Z7",
                                        "Z7K1": "Z885",
                                        "Z885K1": "Z507"
                                    },
                                    "K1": {
                                        "Z1K1": "Z99",
                                        "Z99K1": {
                                            "Z1K1": "Z7",
                                            "Z7K1": "Z17225",
                                            "Z17225K1": "something",
                                            "Z17225K2": {
                                                "Z1K1": "Z39",
                                                "Z39K1": "Z10000K1"
                                            }
                                        }
                                    },
                                    "K2": {
                                        "Z1K1": "Z5",
                                        "Z5K1": "Z500",
                                        "Z5K2": {
                                            "Z1K1": {
                                                "Z1K1": "Z7",
                                                "Z7K1": "Z885",
                                                "Z885K1": "Z500"
                                            },
                                            "K1": "Gateway Timeout"
                                        }
                                    }
                                }
                            }
                        }
                    ]
                }
            }
        }
    }
}
gengh added projects: WikiLambda, function-orchestrator.Jun 27 2024, 8:37 AM
gengh added a comment.Jun 27 2024, 2:13 PM

Another abnormality detected in the nestedMetadata key.
When running the wikilambda_perform_test API, the metadata returned for each test-implementation run contains a "Z24" as an extra item in the child nested metadata set:

See, below, the nestedMetadata key, which contains a map with three items. The first two are valid sets with a zObjectKey key each. The third item is Z24.

{
    "Z1K1": {
        "Z1K1": "Z7",
        "Z7K1": "Z883",
        "Z883K1": "Z6",
        "Z883K2": "Z1"
    },
    "K1": [
        {
            "Z1K1": "Z7",
            "Z7K1": "Z882",
            "Z882K1": "Z6",
            "Z882K2": "Z1"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "implementationId",
            "K2": {
                "Z1K1": "Z6",
                "Z6K1": "Z901"
            }
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "implementationType",
            "K2": "Z14K4"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "nestedMetadata",
            "K2": [
                {
                    "Z1K1": "Z7",
                    "Z7K1": "Z883",
                    "Z883K1": "Z6",
                    "Z883K2": "Z1"
                },
                {
                    "Z1K1": {
                        "Z1K1": "Z7",
                        "Z7K1": "Z883",
                        "Z883K1": "Z6",
                        "Z883K2": "Z1"
                    },
                    "K1": [
                        {
                            "Z1K1": "Z7",
                            "Z7K1": "Z882",
                            "Z882K1": "Z6",
                            "Z882K2": "Z1"
                        },
                        {
                            "Z1K1": {
                                "Z1K1": "Z7",
                                "Z7K1": "Z882",
                                "Z882K1": "Z6",
                                "Z882K2": "Z1"
                            },
                            "K1": "zObjectKey",
                            "K2": "Z881(Z17)"
                        }
                    ]
                },
                {
                    "Z1K1": {
                        "Z1K1": "Z7",
                        "Z7K1": "Z883",
                        "Z883K1": "Z6",
                        "Z883K2": "Z1"
                    },
                    "K1": [
                        {
                            "Z1K1": "Z7",
                            "Z7K1": "Z882",
                            "Z882K1": "Z6",
                            "Z882K2": "Z1"
                        },
                        {
                            "Z1K1": {
                                "Z1K1": "Z7",
                                "Z7K1": "Z882",
                                "Z882K1": "Z6",
                                "Z882K2": "Z1"
                            },
                            "K1": "zObjectKey",
                            "K2": "Z881(Z17)"
                        }
                    ]
                },
                "Z24"
            ]
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "zObjectKey",
            "K2": "null(Z6{\"Z6K1\":\"testing Test\"})"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "orchestrationMemoryUsage",
            "K2": "80.8 MiB"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "orchestrationCpuUsage",
            "K2": "85.102 ms"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "orchestrationStartTime",
            "K2": "2024-06-27T08:52:56.247Z"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "orchestrationEndTime",
            "K2": "2024-06-27T08:52:56.326Z"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "orchestrationDuration",
            "K2": "79 ms"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "orchestrationHostname",
            "K2": "2770f1e79d24"
        },
        {
            "Z1K1": {
                "Z1K1": "Z7",
                "Z7K1": "Z882",
                "Z882K1": "Z6",
                "Z882K2": "Z1"
            },
            "K1": "loadedFromMediaWikiCache",
            "K2": "2024-06-27T14:03:08Z"
        }
    ]
}
gengh added a comment.Jun 28 2024, 1:02 PM

Another abnormality in the function_call returned object:

Normally, the data returned under query.wikilambda_function_call.data is a string encoded JSON. This is the expected response.
However, with some failed executions, the data returned under query.wikilambda_function_call.data is a parsed JSON object.

E.g. Try "Z17225/Quoted value by key" with filled input values. Returns a badly formed Gateway Timeout:

{
    "query": {
        "wikilambda_function_call": {
            "data": {
                "Z1K1": "Z22",
                "Z22K2": {
                    "Z1K1": {
                        "Z1K1": "Z7",
                        "Z7K1": "Z883",
                        "Z883K1": "Z6",
                        "Z883K2": "Z1"
                    },
                    "K1": [
                        {
                            "Z1K1": "Z7",
                            "Z7K1": "Z882",
                            "Z882K1": "Z6",
                            "Z882K2": "Z1"
                        },
                        {
                            "Z1K1": {
                                "Z1K1": "Z7",
                                "Z7K1": "Z882",
                                "Z882K1": "Z6",
                                "Z882K2": "Z1"
                            },
                            "K1": "errors",
                            "K2": {
                                "Z1K1": "Z5",
                                "Z5K1": "Z507",
                                "Z5K2": {
                                    "Z1K1": {
                                        "Z1K1": "Z7",
                                        "Z7K1": "Z885",
                                        "Z885K1": "Z507"
                                    },
                                    "K1": {
                                        "Z1K1": "Z99",
                                        "Z99K1": {
                                            "Z1K1": "Z7",
                                            "Z7K1": "Z17225",
                                            "Z17225K1": "5",
                                            "Z17225K2": {
                                                "Z1K1": "Z39",
                                                "Z39K1": "Z5K2"
                                            }
                                        }
                                    },
                                    "K2": {
                                        "Z1K1": "Z5",
                                        "Z5K1": "Z500",
                                        "Z5K2": {
                                            "Z1K1": {
                                                "Z1K1": "Z7",
                                                "Z7K1": "Z885",
                                                "Z885K1": "Z500"
                                            },
                                            "K1": "Gateway Timeout"
                                        }
                                    }
                                }
                            }
                        }
                    ]
                }
            }
        }
    }
}

While sometimes, the data returned under query.wikilambda_function_call.data is a string that must be parsed as JSON. This is the expected response:

E.g. Try "Z17225/Quoted value by key" with empty input values, returns a correctly formed response and Z22, even if the execution wasn't successful.

{
    "query": {
        "wikilambda_function_call": {
            "success": "",
            "data": "{\"Z1K1\":\"Z22\",\"Z22K1\":\"Z24\",\"Z22K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z883\",\"Z883K1\":\"Z6\",\"Z883K2\":\"Z1\"},\"K1\":[{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"errors\",\"K2\":{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z518\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z518\"},\"Z518K1\":\"Z7\",\"Z518K2\":{\"Z1K1\":\"Z99\",\"Z99K1\":{\"Z1K1\":{\"Z1K1\":\"Z9\",\"Z9K1\":\"Z7\"},\"Z7K1\":{\"Z1K1\":\"Z9\",\"Z9K1\":\"Z17225\"},\"Z17225K1\":{\"Z1K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}},\"Z17225K2\":{\"Z1K1\":{\"Z1K1\":\"Z9\",\"Z9K1\":\"Z39\"},\"Z39K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}}}},\"Z518K3\":{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z502\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z502\"},\"Z502K1\":\"Z526\",\"Z502K2\":{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z526\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z526\"},\"Z526K1\":{\"Z1K1\":\"Z39\",\"Z39K1\":\"Z17225K1\"},\"Z526K2\":{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z509\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z509\"},\"Z509K1\":[\"Z5\",{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z526\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z526\"},\"Z526K1\":{\"Z1K1\":\"Z39\",\"Z39K1\":\"Z1K1\"},\"Z526K2\":{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z509\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z509\"},\"Z509K1\":[\"Z5\",{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z511\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z511\"},\"Z511K1\":{\"Z1K1\":\"Z39\",\"Z39K1\":\"Z4K1\"},\"Z511K2\":{\"Z1K1\":\"Z99\",\"Z99K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}}}},{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z535\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z535\"},\"Z535K1\":{\"Z1K1\":\"Z99\",\"Z99K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}}}}]}}}},{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z532\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z532\"},\"Z532K1\":{\"Z1K1\":\"Z99\",\"Z99K1\":{\"Z1K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}}}}},{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z535\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z535\"},\"Z535K1\":{\"Z1K1\":\"Z99\",\"Z99K1\":{\"Z1K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}}}}},{\"Z1K1\":\"Z5\",\"Z5K1\":\"Z511\",\"Z5K2\":{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z885\",\"Z885K1\":\"Z511\"},\"Z511K1\":{\"Z1K1\":\"Z39\",\"Z39K1\":\"Z18K1\"},\"Z511K2\":{\"Z1K1\":\"Z99\",\"Z99K1\":{\"Z1K1\":{\"Z1K1\":\"Z6\",\"Z6K1\":\"\"}}}}}]}}}}}}}}},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"orchestrationMemoryUsage\",\"K2\":\"82.08 MiB\"},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"orchestrationCpuUsage\",\"K2\":\"7.137 ms\"},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"orchestrationStartTime\",\"K2\":\"2024-06-26T13:00:45.634Z\"},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"orchestrationEndTime\",\"K2\":\"2024-06-26T13:00:45.642Z\"},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"orchestrationDuration\",\"K2\":\"8 ms\"},{\"Z1K1\":{\"Z1K1\":\"Z7\",\"Z7K1\":\"Z882\",\"Z882K1\":\"Z6\",\"Z882K2\":\"Z1\"},\"K1\":\"orchestrationHostname\",\"K2\":\"function-orchestrator-main-orchestrator-75fc46f868-grzvw\"}]}}"
        }
    }
}
gerritbot added a comment.Jun 28 2024, 1:41 PM

Change #1050611 had a related patch set uploaded (by Genoveva Galarza; author: Genoveva Galarza):

[mediawiki/extensions/WikiLambda@master] Fix response envelope format when API catches ClientException or ServerException

https://gerrit.wikimedia.org/r/1050611

gerritbot added a project: Patch-For-Review.Jun 28 2024, 1:41 PM
gengh claimed this task.Jun 28 2024, 1:46 PM
gengh added a comment.Jun 28 2024, 1:54 PM

The issues described in comments T368531#9929498 and T368531#9934302 are caused in the WikiLambda API layer.

Patch 1050611 addresses correct ZResponseEnvelope initialization and addition into the response when there's a Client/Server exception caught.

Jdforrester-WMF changed the task status from Open to In Progress.Jul 1 2024, 8:49 PM
Jdforrester-WMF moved this task from Bugs to investigate to Ready to deploy on the Abstract Wikipedia team (25Q1 (Jul–Sep)) board.
gerritbot added a comment.Jul 1 2024, 8:56 PM

Change #1050611 merged by jenkins-bot:

[mediawiki/extensions/WikiLambda@master] Fix response envelope format when API catches ClientException or ServerException

https://gerrit.wikimedia.org/r/1050611

ReleaseTaggerBot added a project: MW-1.43-notes (1.43.0-wmf.12; 2024-07-02).Jul 1 2024, 9:00 PM
Maintenance_bot removed a project: Patch-For-Review.Jul 1 2024, 9:30 PM
GrounderUK mentioned this in T363908: Review WikiLambda system’s criteria for updating a function’s implementation list.Jul 3 2024, 12:54 PM
Jdforrester-WMF moved this task from Ready to deploy to Needs Sign-off on the Abstract Wikipedia team (25Q1 (Jul–Sep)) board.Jul 10 2024, 4:48 PM
Jdforrester-WMF closed this task as Resolved.Jul 18 2024, 3:06 PM
Content licensed under Creative Commons Attribution-ShareAlike (CC BY-SA) 4.0 unless otherwise noted; code licensed under GNU General Public License (GPL) 2.0 or later and other open source licenses. By using this site, you agree to the Terms of Use, Privacy Policy, and Code of Conduct. · Wikimedia Foundation · Privacy Policy · Code of Conduct · Terms of Use · Disclaimer · CC-BY-SA · GPL · Credits