libdeadmock 0.1.6

API Mocking and Virtualization
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// Copyright (c) 2018 libdeadmock developers
//
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. All files in the project carrying such notice may not be copied,
// modified, or distributed except according to those terms.

//! HTTP request method matching
use cached::{cached_key_result, UnboundCache};
use crate::config::{self, Request as RequestConfig};
use crate::error::Error;
use crate::matcher::{RequestMatch, Slogger};
use http::Request;
use lazy_static::lazy_static;
use regex::Regex;
use slog::{trace, Logger};
use slog_try::try_trace;
use std::fmt;

/// Exactly match an HTTP method.
#[derive(Clone, Debug, Default)]
pub struct ExactMatch {
    stdout: Option<Logger>,
    stderr: Option<Logger>,
}

impl Slogger for ExactMatch {
    /// Add a stdout logger
    fn set_stdout(mut self, stdout: Option<Logger>) -> Self {
        self.stdout = stdout;
        self
    }

    /// Add a stderr logger
    fn set_stderr(mut self, stderr: Option<Logger>) -> Self {
        self.stderr = stderr;
        self
    }
}

impl RequestMatch for ExactMatch {
    fn is_match(
        &self,
        request: &Request<()>,
        request_config: &config::Request,
    ) -> Result<Option<bool>, Error> {
        if let Some(method) = request_config.method() {
            try_trace!(
                self.stdout,
                "Exact Match (Method) - Checking {} against {}",
                method,
                request.method().as_str()
            );
            Ok(Some(request.method().as_str() == &method[..]))
        } else {
            try_trace!(self.stdout, "Exact Match (Method) - No check performed");
            Ok(None)
        }
    }
}

impl fmt::Display for ExactMatch {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Exact Match On Method")
    }
}

/// Pattern match an HTTP method.
#[derive(Clone, Debug, Default)]
pub struct PatternMatch {
    stdout: Option<Logger>,
    stderr: Option<Logger>,
}

impl Slogger for PatternMatch {
    /// Add a stdout logger
    fn set_stdout(mut self, stdout: Option<Logger>) -> Self {
        self.stdout = stdout;
        self
    }

    /// Add a stderr logger
    fn set_stderr(mut self, stderr: Option<Logger>) -> Self {
        self.stderr = stderr;
        self
    }
}

cached_key_result!{
    REGEX: UnboundCache<String, Regex> = UnboundCache::new();
    Key = { method_pattern.to_string() };
    fn generate_regex(method_pattern: &str) -> Result<Regex, String> = {
        let regex_result = Regex::new(method_pattern);

        match regex_result {
            Ok(regex) => Ok(regex),
            Err(e) => Err(e.to_string()),
        }
    }
}

impl RequestMatch for PatternMatch {
    fn is_match(
        &self,
        request: &Request<()>,
        request_config: &RequestConfig,
    ) -> Result<Option<bool>, Error> {
        if let Some(method_pattern) = request_config.method_pattern() {
            let method = request.method().as_str();
            try_trace!(
                self.stdout,
                "Pattern Match (Method) - Checking {} against {}",
                method,
                method_pattern
            );
            if let Ok(regex) = generate_regex(method_pattern) {
                Ok(Some(regex.is_match(method)))
            } else {
                Ok(Some(false))
            }
        } else {
            try_trace!(self.stdout, "Pattern Match (Method) - No check performed");
            Ok(None)
        }
    }
}

impl fmt::Display for PatternMatch {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Pattern Match On Method")
    }
}