I'm a newbie to Neo4j, which is at the moment my main candidate of all the graph databases out there. I'm writing a thesis about integrating a database to a smart city, and Neo4j is one of the best candidates for this purpose, if not the best.
However, I'm unable to get Neo4j's SPARQL plugin working. I'm a newbie also to Maven, but I was able to download the plugin from GitHub and compile it - however, I had to skip the tests to be able to compile it. Anyway, 'build success.'
I followed the instructions
http://neo4j-contrib.github.io/sparql-plugin/
and I suppose that I was able to insert the example quads (example 1) to my database:
curl -X POST -H Content-Type:application/json -H Accept:application/json --data-binary #sampledata.txt -v http:// l o c a l h o s t :7474/db/data/ext/SPARQLPlugin/graphdb/insert_quad
Response:
* Hostname was NOT found in DNS cache
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 7474 (#0)
> POST /db/data/ext/SPARQLPlugin/graphdb/insert_quad HTTP/1.1
> User-Agent: curl/7.35.0
> Host: localhost:7474
> Content-Type:application/json
> Accept:application/json
> Content-Length: 130
>
* upload completely sent off: 130 out of 130 bytes
< HTTP/1.1 204 No Content
< Access-Control-Allow-Origin: *
* Server Jetty(9.0.5.v20130815) is not blacklisted
< Server: Jetty(9.0.5.v20130815)
<
* Connection #0 to host localhost left intact
However, I cannot find that quad in my database. I suppose that a query 'MATCH (n) RETURN n LIMIT 100' would show them, right? Anyway, I only find one node with one property, 'value: urn:com.tinkerpop.blueprints.pgm.oupls.sail:namespaces.' When I try querying (example 2):
curl -X POST -H Content-Type:application/json -H Accept:application/json --data-binary #sampledata.txt -v http:// l o c a l h o s t :7474/db/data/ext/SPARQLPlugin/graphdb/execute_sparql
Response:
Hostname was NOT found in DNS cache
Trying 127.0.0.1...
Connected to localhost (127.0.0.1) port 7474 (#0)
POST /db/data/ext/SPARQLPlugin/graphdb/execute_sparql HTTP/1.1
User-Agent: curl/7.35.0
Host: localhost:7474
Content-Type:application/json
Accept:application/json
Content-Length: 74
upload completely sent off: 74 out of 74 bytes < HTTP/1.1 500 Server Error < Content-Type: application/json; charset=UTF-8 <
Access-Control-Allow-Origin: * < Content-Length: 3274
Server Jetty(9.0.5.v20130815) is not blacklisted < Server: Jetty(9.0.5.v20130815) < { "message" :
"org.openrdf.query.algebra.Var.setConstant(Z)V", "exception" :
"NoSuchMethodError", "fullname" : "java.lang.NoSuchMethodError",
"stacktrace" : [
"org.openrdf.query.parser.sparql.TupleExprBuilder.createConstVar(TupleExprBuilder.java:340)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.mapValueExprToVar(TupleExprBuilder.java:271)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:1512)",
"org.openrdf.query.parser.sparql.ast.ASTPathSequence.jjtAccept(ASTPathSequence.java:20)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:1323)",
"org.openrdf.query.parser.sparql.ast.ASTPathAlternative.jjtAccept(ASTPathAlternative.java:18)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:1875)",
"org.openrdf.query.parser.sparql.ast.ASTPropertyListPath.jjtAccept(ASTPropertyListPath.java:18)",
"org.openrdf.query.parser.sparql.ast.SimpleNode.childrenAccept(SimpleNode.java:157)",
"org.openrdf.query.parser.sparql.ASTVisitorBase.visit(ASTVisitorBase.java:979)",
"org.openrdf.query.parser.sparql.ast.ASTTriplesSameSubjectPath.jjtAccept(ASTTriplesSameSubjectPath.java:18)",
"org.openrdf.query.parser.sparql.ast.SimpleNode.childrenAccept(SimpleNode.java:157)",
"org.openrdf.query.parser.sparql.ASTVisitorBase.visit(ASTVisitorBase.java:421)",
"org.openrdf.query.parser.sparql.ast.ASTBasicGraphPattern.jjtAccept(ASTBasicGraphPattern.java:19)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:1144)",
"org.openrdf.query.parser.sparql.ast.ASTGraphPatternGroup.jjtAccept(ASTGraphPatternGroup.java:19)",
"org.openrdf.query.parser.sparql.ast.SimpleNode.childrenAccept(SimpleNode.java:157)",
"org.openrdf.query.parser.sparql.ASTVisitorBase.visit(ASTVisitorBase.java:1021)",
"org.openrdf.query.parser.sparql.ast.ASTWhereClause.jjtAccept(ASTWhereClause.java:19)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:389)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:228)",
"org.openrdf.query.parser.sparql.ast.ASTSelectQuery.jjtAccept(ASTSelectQuery.java:19)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:378)",
"org.openrdf.query.parser.sparql.TupleExprBuilder.visit(TupleExprBuilder.java:228)",
"org.openrdf.query.parser.sparql.ast.ASTQueryContainer.jjtAccept(ASTQueryContainer.java:21)",
"org.openrdf.query.parser.sparql.SPARQLParser.buildQueryModel(SPARQLParser.java:210)",
"org.openrdf.query.parser.sparql.SPARQLParser.parseQuery(SPARQLParser.java:164)",
"org.neo4j.server.plugin.sparql.SPARQLPlugin.executeSPARQL(SPARQLPlugin.java:68)",
"java.lang.reflect.Method.invoke(Method.java:606)",
"org.neo4j.server.plugins.PluginMethod.invoke(PluginMethod.java:61)",
"org.neo4j.server.plugins.PluginManager.invoke(PluginManager.java:159)",
"org.neo4j.server.rest.web.ExtensionService.invokeGraphDatabaseExtension(ExtensionService.java:312)",
"org.neo4j.server.rest.web.ExtensionService.invokeGraphDatabaseExtension(ExtensionService.java:134)",
"java.lang.reflect.Method.invoke(Method.java:606)",
"org.neo4j.server.rest.transactional.TransactionalRequestDispatcher.dispatch(TransactionalRequestDispatcher.java:139)",
"java.lang.Thread.run(Thread.java:744)" ]
Connection #0 to host localhost left intact
I'm wondering what could be causing this kind of behavior. I have tried SPARQL plugin with many configurations, according to all the instructions I have found, but the plugin just refuses to work.
By the way, I'm wondering is it suitable for production use. Can someone comment on this?
Perhaps there are more ways than one to get RDF working in Neo4j? As I'm a newbie to Neo4j, I'm, of course, interested in solutions that are somewhat easy to install and tailor. Well, first and foremost, they should really work in production use.
Neo4j is working otherwise just great! REST API works just fine, but I would like to compare it with the SPARQL endpoint if possible.
Related
Hi am developing a solution that creates and deploys services to Google cloud run using its REST API with OAuth as a service account created fot that purpose.
I am stuck at making the created services available publicly.
I was unable to find a corresponding --allow-unauthenticated parameter as with gcloud to use from the API.
The only way I found is to manually add allUsers as Cloud Run Invoker on each service I want publicly reachable. But, I would like all the services from that service-account to be automatically reacheable publicly.
I would like to know if there is a better(more automatic) way to achieve this.
Thanks in advance.
Firstly, you can't do this in only one command. You have to deploy the service and then to grant allUsers on the service. The CLI do this 2 steps conveniently for you.
Anyway, when you are stuck like this, there is a useful trick: add --log-http at your gcloud command. Like this, you will see all the HTTP API calls performed by the CLI.
if you do this when you deploy a new Cloud Run service, you will have tons of line and, at a moment, you have this
==== request start ====
uri: https://run.googleapis.com/v1/projects/gbl-imt-homerider-basguillaueb/locations/us-central1/services/predict2:setIamPolicy?alt=json
method: POST
== headers start ==
b'Authorization': --- Token Redacted ---
b'X-Goog-User-Project': b'gbl-imt-homerider-basguillaueb'
b'accept': b'application/json'
b'accept-encoding': b'gzip, deflate'
b'content-length': b'98'
b'content-type': b'application/json'
b'user-agent': b'google-cloud-sdk gcloud/299.0.0 command/gcloud.run.deploy invocation-id/61070d063a604fdda8e87ad63777e3ae environment/devshell environment-version/None interactive/True from-script/False python/3.7.3 term/screen (Linux 4.19.112+
)'
== headers end ==
⠹ Deploying new service...
{"policy": {"bindings": [{"members": ["allUsers"], "role": "roles/run.invoker"}], "etag": "ACAB"}}
== body end ==
⠹ Setting IAM Policy...
---- response start ----
status: 200
-- headers start --
-content-encoding: gzip
cache-control: private
content-length: 159
content-type: application/json; charset=UTF-8
date: Wed, 08 Jul 2020 11:37:11 GMT
server: ESF
transfer-encoding: chunked
vary: Origin, X-Origin, Referer
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 0
-- headers end --
-- body start --
{
"version": 1,
"etag": "BwWp7IdZGHs=",
"bindings": [
{
"role": "roles/run.invoker",
"members": [
"allUsers"
]
}
]
}
So, it's an addition API call that perform the CLI for you. You can find here the API definition
If you want to perform a call manually, you can do a request like this
curl -H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "content-type: application/json" -X POST \
-d '{"policy": {"bindings": [{"members": ["allUsers"], "role": "roles/run.invoker"}]}}' \
"https://run.googleapis.com/v1/projects/<PROJECT_ID>/locations/<REGION>/services/<SERVICE_NAME>:setIamPolicy"
I'm trying to access jenkins (v2.177) API using curl. For instance, I try to get the lastbuild number as follows :
curl -v -u user:pass http://myjenkins:port/job/myjob/lastBuild/api/json
Insted of giving me a json, I get a "302 Found" with Content-Length egal to zero ! :
`* Trying 11.90.1.9...
* TCP_NODELAY set
* Connected to 11.90.1.9 (11.90.1.9) port 8484 (#0)
* Server auth using Basic with user 'user7'
> GET /job/myjob/lastBuild HTTP/1.1
> Host: 11.90.1.9:8484
> Authorization: Basic dGVzdGl.../blc2Y...
> User-Agent: curl/7.58.0
> Accept: */*
>
< HTTP/1.1 302 Found
< Date: Tue, 14 May 2019 13:01:12 GMT
< X-Content-Type-Options: nosniff
< Location: http://11.90.1.9:8484/job/myjob/
< Content-Length: 0
< Server: Jetty(9.4.z-SNAPSHOT)
<
* Connection #0 to host 11.90.1.9 left intact`
Any idea why I don't get the JSON ?
Okay ...
I had to specify the branch like that :
curl -v -u user:pass http://myjenkins:port/job/myjob/job/mybranch/lastBuild/api/json
Now it works
I'm trying to get Slim to run on my Windows 7 system.
So far I've gotten everything installed with Composer but when I run a very simple program, the output is not as intended.
Below is my code:
<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);
use Slim\App;
use Slim\Http\Request;
use Slim\Http\Response;
require '../vendor/autoload.php';
$app = new App;
$app->get('/', function (Request $in, Response $out, $args) {
return $out->write("xxxxx");
});
$app->run();
I am expecting output "xxxxx", instead i get "x".
This means I loose 4 characters somewhere.
Running PHP 5.5.12
The encoding is UTF-8 (not BOM)
When i run
"curl -v http://localhost:8080/"
I get
D:\wamp\www\slim_test\src\public>curl -v http://localhost:8080/
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET / HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.46.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Host: localhost:8080
< Connection: close
< X-Powered-By: PHP/5.5.12
< Content-Type: text/html; charset=UTF-8
< Content-Length: 5
<
x* Closing connection 0
I'd appreciate your help.
EDIT
Once i append these lines of code to the end of the file, the response is correct.
$response = $app->run(true); //Silent mode, wont send the response
$response = $response->withoutHeader("Content-Length"); //Remove the Content-Length
$app->respond($response); //Now we send the response
I cannot figure out why.....?
This issue has been solved as I found a very stupid mistake.
I had 2 blank spaces before the <?php tag.
I am trying to send a POST request to a site using Hyper 0.9. The request works with curl:
curl https://api.particle.io/v1/devices/secret/set_light -d args=0 -d access_token=secret
and Python:
import requests
r = requests.post("https://api.particle.io/v1/devices/secret/set_light",
data={"access_token": "secret", "args": "0"})
but my Rust implementation doesn't seem to go through, always yielding 400.
use hyper::client::Client;
let addr = "https://api.particle.io/v1/devices/secret/set_light";
let body = "access_token=secret&args=0";
let mut res = client.post(addr)
.body(body)
.send()
.unwrap();
It is greatly beneficial to be aware of various tools for debugging HTTP problems like this. In this case, I used nc to start a dumb server so I could see the headers the HTTP client is sending (nc -l 5000). I modified the cURL and Rust examples to point to 127.0.0.1:5000 and this was the output:
cURL:
POST /v1/devices/secret/set_light HTTP/1.1
Host: 127.0.0.1:5000
User-Agent: curl/7.43.0
Accept: */*
Content-Length: 26
Content-Type: application/x-www-form-urlencoded
args=0&access_token=secret
Hyper:
POST /v1/devices/secret/set_light HTTP/1.1
Host: 127.0.0.1:5000
Content-Length: 26
access_token=secret&args=0
I don't have an account at particle.io to test with, but I'm guessing you need that Content-Type header. Setting a User-Agent would be good etiquette and the Accept header is really more for your benefit, so you might as well set them too.
Using curl I have:
$ curl -v -d "userName=user1&password=passwd1&language=en" http://myhost:23094/api/v2/authToken
...
> POST /api/v2/authToken HTTP/1.1
> User-Agent: curl/7.30.0
> Host: myhost:23094
> Accept: */*
> Content-Length: 39
> Content-Type: application/x-www-form-urlencoded
>
* upload completely sent off: 39 out of 39 bytes
< HTTP/1.1 200 OK
I try to build a yandex tank script using this query:
My load.ini:
[phantom]
address=my.ip.v4.here
port=8094
rps_schedule=line(1, 10, 1m)
ammo_type=uripost
My ammo.txt
133 login
POST /api/v2/authToken HTTP/1.1
User-Agent: tank
Host: somemyhost.com
Content-Length: 39
userName=user1&password=passwd1&language=en
When I run yandex-tank ammo.txt, I get the 400 Bad Request error.
It seems to me, that tank can't use the body parameters. How to make it use them? What do I do wrong?
Your ammo is not in uripost format. Don't specify ammo_type at all and it should work properly. If you want to use uripost format, specify your headers in load.ini and write something like the following in your ammo file:
39 /api/v2/authToken login
userName=user1&password=passwd1&language=en
Here is the description of the uripost format.