109 lines
5.1 KiB
Go
109 lines
5.1 KiB
Go
package main
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import (
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"fmt"
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"strings"
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"github.com/lixenwraith/logwisp/internal/version"
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)
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// helpText is the CLI usage reference. Scalar flags map 1:1 to TOML config paths.
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const helpText = `LogWisp %s - log collection, processing, and distribution
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Usage:
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lw [options] [< input] No file, no pipeline options: stdin to stdout,
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line for line, like cat; exits at end of input
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lw -c|--config FILE [options] Run the file's pipelines
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lw -p|--preset SPEC [options] Run a preset's pipeline
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lw -t|--check [options] Build every pipeline and plugin, report, exit
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lw --dump [options] Print the effective configuration as TOML, exit
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lw help | -h | --help
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lw -V | --version
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Commands (lw COMMAND -h lists its subcommands):
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%s
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Options: a short option is its long one; a value follows as the next argument
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or after '=' (-c FILE, --config=FILE), one that starts with '-' after '=';
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short options do not combine.
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-c, --config FILE Configuration file (default:
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~/.config/logwisp/logwisp.toml if it exists,
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else ./logwisp.toml)
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-t, --check Build every pipeline and plugin, report, exit
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--dump Print the effective configuration, exit
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-q, --quiet Silence lw's own log and notices; pipeline
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output still flows
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--color [WHEN] Level names in color on console sinks:
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auto (a terminal, NO_COLOR unset; default),
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always (bare --color) or never
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-V, --version Print the version and exit
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-h, --help Print this help and exit
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-- End the options
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Configuration keys are flags by their TOML path, '_' and '.' kept:
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--KEY=VALUE e.g. --logging.level=debug
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--status_reporter=BOOL Periodic status logging (default: true with
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a configuration file)
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--auto_reload=BOOL Reload when the file changes (default: false)
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Logging (lw's own log goes to stderr, at info with a configuration file and
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at warn without one):
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--logging.output=MODE file|stdout|stderr|split|all|none
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--logging.level=LEVEL debug|info|warn|error
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--logging.file.directory=DIR
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Pipelines (replace the file's pipelines; see doc/cli.md):
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-p, --preset NAME[,KEY=VALUE...]
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Start a pipeline with a preset: pipe, tail,
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serve, edge, aggregator; lw preset NAME -h
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lists its keys, lw preset NAME prints it
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--pipeline NAME Start a pipeline; earlier specs go to "cli"
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--source SPEC TYPE[,KEY=VALUE...], repeatable
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--sink SPEC e.g. http,host=0.0.0.0,port=8080, repeatable
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--filter SPEC include|exclude,patterns=RE, repeatable
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--format SPEC json|txt|raw[,KEY=VALUE...]
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--rate-limit SPEC rate=N[,burst=N,policy=drop|pass]
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--heartbeat SPEC interval_ms=N[,include_stats=true,...]
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A pipeline without --source reads stdin, one without --sink writes stdout.
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Keys nest with '.' (tls.cert_file=...), a repeated key makes a list, and
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'\' escapes ',' '=' '\' in values.
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Examples:
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lw < app.log > copy.log Copy, line for line
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tail -F app.log | lw --filter include,patterns=ERROR,patterns=WARN
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journalctl -f | lw --sink http,host=127.0.0.1,port=8080
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Serve stdin live; browse http://127.0.0.1:8080/
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lw --source file,directory=/var/log/app,pattern='*.log' --format txt
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lw -p tail,path=/var/log/app Follow a directory's files
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lw --preset serve,path=/var/log/app,tls=self,users=users.toml
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HTTPS stream, SCRAM logins
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lw --preset edge,path=/var/log/app,to=agg:9000,ca=ca.crt,user=edge-01,\
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password_file=edge-01.pass Forward to an aggregator
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Environment:
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LOGWISP_<PATH> Config path, '.' -> '_', uppercase
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e.g. LOGWISP_LOGGING_LEVEL=debug
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LOGWISP_CONFIG_FILE Configuration file path
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LOGWISP_CONFIG_DIR Configuration directory
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LOGWISP_PIPELINE, LOGWISP_PRESET, LOGWISP_SOURCE[_N], LOGWISP_SINK[_N],
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LOGWISP_FILTER[_N], LOGWISP_FORMAT, LOGWISP_RATE_LIMIT, LOGWISP_HEARTBEAT
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One pipeline, specs as the flags (_N adds
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more); ignored when a pipeline flag is given
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Signals:
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SIGINT, SIGTERM Graceful shutdown
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SIGHUP, SIGUSR1 Reload configuration
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Exit codes:
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0 success, including the end of input
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1 general error, including an error in lw's own options (lw COMMAND
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exits 2 on a usage error)
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2 configuration file not found
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`
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func printHelp() {
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var list strings.Builder
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for _, c := range commands {
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fmt.Fprintf(&list, " lw %-26s %s\n", c.name+" COMMAND", c.summary)
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}
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fmt.Printf(helpText, version.Short(), list.String())
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}
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