golang源码分析：cayley(1)

# clone project
git clone https://github.com/cayleygraph/cayley
cd cayley

# Download dependencies
go mod download

# Download web files (optional)

go run cmd/download_ui/download_ui.go

# Install packr 2

go get -u github.com/gobuffalo/packr/v2/packr2
% go install github.com/gobuffalo/packr/v2/packr2

Generate static files go modules
packr2
build the binary
go build ./cmd/cayley

missing go.sum entry for module providing package github.com/gogo/protobuf/proto (imported by github.com/cayleygraph/quad/pquads); to add:
        go get github.com/cayleygraph/quad/pquads@v1.2.4

%   go get github.com/cayleygraph/cayley/cmd/cayley
go: downloading google.golang.org/protobuf v1.26.0

 %  go get github.com/dop251/goja@v0.0.0-20190105122144-6d5bf35058fa

% go build ./cmd/cayley

% ./cayley help
I0521 20:10:47.158113   58688 command.go:915] Cayley version: v0.8.x-dev (dev snapshot)
Cayley is a graph store and graph query layer.

Usage:
  cayley [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  convert     Convert quad files between supported formats.
  dedup       Deduplicate bnode values
  dump        Bulk-dump the database into a quad file.
  health      Health check HTTP server
  help        Help about any command
  http        Serve an HTTP endpoint on the given host and port.
  init        Create an empty database.
  load        Bulk-load a quad file into the database.
  query       Run a query in a specified database and print results.
  repl        Drop into a REPL of the given query language.
  schema      Commands related to RDF schema
  upgrade     Upgrade Cayley database to current supported format.
  version     Prints the version of Cayley.

Flags:
      --alsologtostderr string   log to standard error as well as files
      --backtrace string         when logging hits line file:N, emit a stack trace (default ":0")
      --batch int                size of quads batch to load at once (default 10000)
  -c, --config string            path to an explicit configuration file
      --cpuprofile string        path to output cpu profile
  -d, --db string                database backend to use: badger, bbolt, bolt, btree, cockroach, couch, elastic, leveldb, memstore, mongo, mysql, postgres, sqlite (default "memstore")
  -a, --dbpath string            path or address string for database
      --dup                      don't stop loading on duplicated on add (default true)
  -h, --help                     help for cayley
  -l, --log string               logs at or above this threshold go to stderr (default "2")
      --logs string              If non-empty, write log files in this directory
      --logtostderr string       log to standard error instead of files (default "true")
      --memprofile string        path to output memory profile
      --metrics string           host to serve metrics on (disabled by default)
      --missing                  don't stop loading on missing key on delete
      --pprof string             host to serve pprof on (disabled by default)
      --read_only                open database in read-only mode
  -v, --verbose string           log level for V logs
      --vmodule string           comma-separated list of pattern=N settings for file-filtered logging

Use "cayley [command] --help" for more information about a command.

% ./cayley repl -i data/testdata.nq
I0521 20:11:21.013740   59131 command.go:915] Cayley version: v0.8.x-dev (dev snapshot)
I0521 20:11:21.014013   59131 repl.go:54] using backend "memstore"
I0521 20:11:21.015741   59131 repl.go:58] loaded "data/testdata.nq" in 1.666345ms
creating new history file: ".cayley_history"
cayley>

% ./cayley http -i data/testdata.nq
I0521 20:11:50.735282   59357 command.go:915] Cayley version: v0.8.x-dev (dev snapshot)
I0521 20:11:50.735518   59357 http.go:20] using backend "memstore"
I0521 20:11:50.736100   59357 http.go:24] loaded "data/testdata.nq" in 532.817µs
I0521 20:11:50.736170   59357 command.go:940] listening on 127.0.0.1:64210, web interface at http://127.0.0.1:64210

% ./cayley http --load ./data/30kmoviedata.nq.gz 
I0521 20:17:40.920658   62301 command.go:915] Cayley version: v0.8.x-dev (dev snapshot)
I0521 20:17:40.921659   62301 http.go:20] using backend "memstore"
I0521 20:17:44.913698   62301 http.go:24] loaded "./data/30kmoviedata.nq.gz" in 3.991845522s
I0521 20:17:44.913809   62301 command.go:940] listening on 127.0.0.1:64210, web interface at http://127.0.0.1:64210

g.V().getLimit(5);

{
    "result": [
        {
            "id": {
                "@id": "_:100000"
            }
        },
        {
            "id": {
                "@id": "/film/performance/actor"
            }
        },
        {
            "id": {
                "@id": "/en/larry_fine_1902"
            }
        },
        {
            "id": {
                "@id": "_:100001"
            }
        },
        {
            "id": {
                "@id": "/en/samuel_howard"
            }
        }
    ]
}

g.V()
  .has("<name>", "Humphrey Bogart")
  .all();

{
    "result": [
        {
            "id": {
                "@id": "/en/humphrey_bogart"
            }
        }
    ]
}

g.V()
  .has("<name>", "Casablanca")
  .out("</film/film/starring>")
  .out("</film/performance/actor>")
  .out("<name>")
  .all();

{
    "result": [
        {
            "id": "Humphrey Bogart"
        },
        {
            "id": "Ingrid Bergman"
        },
        {
            "id": "Paul Henreid"
        },
        {
            "id": "Claude Rains"
        },
        {
            "id": "Conrad Veidt"
        },
        {
            "id": "Sydney Greenstreet"
        },
        {
            "id": "Peter Lorre"
        },
        {
            "id": "S.Z. Sakall"
        },
        {
            "id": "Madeleine LeBeau"
        },
        {
            "id": "Dooley Wilson"
        },
        {
            "id": "Joy Page"
        },
        {
            "id": "John Qualen"
        },
        {
            "id": "Leonid Kinskey"
        },
        {
            "id": "Helmut Dantine"
        },
        {
            "id": "Lou Marcelle"
        }
    ]
}

var filmToActor = g
  .Morphism()
  .out("</film/film/starring>")
  .out("</film/performance/actor>");

g.V()
  .has("<name>", "Casablanca")
  .follow(filmToActor)
  .out("<name>")
  .all();

{
    "result": [
        {
            "id": "Humphrey Bogart"
        },
        {
            "id": "Ingrid Bergman"
        },
        {
            "id": "Paul Henreid"
        },
        {
            "id": "Claude Rains"
        },
        {
            "id": "Conrad Veidt"
        },
        {
            "id": "Sydney Greenstreet"
        },
        {
            "id": "Peter Lorre"
        },
        {
            "id": "S.Z. Sakall"
        },
        {
            "id": "Madeleine LeBeau"
        },
        {
            "id": "Dooley Wilson"
        },
        {
            "id": "Joy Page"
        },
        {
            "id": "John Qualen"
        },
        {
            "id": "Leonid Kinskey"
        },
        {
            "id": "Helmut Dantine"
        },
        {
            "id": "Lou Marcelle"
        }
    ]
}