@bsv/overlay-express/dist/esm/src/ChaintracksProvider.js

BSV Blockchain Overlay Express

function trimUrl(url) {
    let trimmed = url;
    while (trimmed.endsWith('/'))
        trimmed = trimmed.slice(0, -1);
    return trimmed;
}
function trimPrefix(prefix) {
    if (prefix === '')
        return '';
    let trimmed = prefix.startsWith('/') ? prefix : `/${prefix}`;
    while (trimmed.endsWith('/'))
        trimmed = trimmed.slice(0, -1);
    return trimmed;
}
/**
 * Minimal go-chaintracks HTTP client for Overlay Express.
 *
 * It intentionally implements the SDK ChainTracker surface plus header lookup,
 * which is enough for proof validation, BASM headers, and reorg stream URL
 * construction without depending on wallet-toolbox client export timing.
 */
export class ChaintracksProvider {
    baseUrl;
    fetcher;
    constructor(url, config = {}) {
        this.baseUrl = `${trimUrl(url)}${trimPrefix(config.apiPrefix ?? '/chaintracks/v2')}`;
        this.fetcher = config.fetch ?? fetch;
    }
    async currentHeight() {
        const response = await this.getJson('/height');
        return response.height;
    }
    async isValidRootForHeight(root, height) {
        const header = await this.findHeaderForHeight(height);
        return header !== undefined && header.merkleRoot === root;
    }
    async findHeaderForHeight(height) {
        return await this.getJsonOrUndefined(`/header/height/${height}`);
    }
    reorgStreamUrl() {
        return `${this.baseUrl}/reorg/stream`;
    }
    async getJson(path) {
        const value = await this.getJsonOrUndefined(path);
        if (value === undefined) {
            throw new Error(`Chaintracks returned no value for ${path}`);
        }
        return value;
    }
    async getJsonOrUndefined(path) {
        const response = await this.fetcher(`${this.baseUrl}${path}`, {
            headers: { Accept: 'application/json' }
        });
        if (response.status === 404)
            return undefined;
        if (!response.ok) {
            throw new Error(`Chaintracks request failed for ${path}: ${response.status} ${response.statusText}`);
        }
        return await response.json();
    }
}
//# sourceMappingURL=ChaintracksProvider.js.map